WO2016135327A1

WO2016135327A1 - High-frequency filter of cavity design

Info

Publication number: WO2016135327A1
Application number: PCT/EP2016/054154
Authority: WO
Inventors: Jan GRÄVENDIECK
Original assignee: Kathrein-Austria Ges.M.B.H
Priority date: 2015-02-27
Filing date: 2016-02-26
Publication date: 2016-09-01
Also published as: DE102015002579A1

Abstract

The invention relates to a high-frequency filter (1) of cavity design comprising at least two resonators (4₁, 5₁, 6₁, 7₁) each having a resonator inner conductor (4_1b, 5_1b, 6_1b, 7_1b), wherein the at least two resonators (4₁, 5₁, 6₁, 7₁) each form a filter path (4, 5, 6, 7) or are a constituent part of such a filter path (4, 5, 6, 7). Furthermore, the high-frequency filter (1) comprises at least one interconnecting resonator (2), which has an interconnecting resonator inner conductor (3), wherein the interconnecting resonator inner conductor (3) is connected electrically to a housing base and extends in the axial direction from the housing base in the direction of the housing cover. The interconnecting resonator (2) is coupled to the at least two resonators (4₁, 5₁, 6₁, 7₁) and is fed at least one further signal path (11). An outer surface (10) of the interconnecting resonator inner conductor (3) is larger than each outer surface (4_1c, 5_1c, 6_1c, 7_1c) of all the resonator inner conductors (4₁, 5₁,6₁, 7₁) which are coupled directly to the interconnecting resonator inner conductor (3).

Description

High frequency filter in cavity construction

The invention relates to a high frequency filter in cavity construction. In radio systems, especially in the mobile sector, a common antenna is often used for transmit and receive signals. In this case, the transmit and receive signals each use different Frequenzbe ^¬ rich, and the antenna must be suitable for transmitting and receiving in both frequency ranges. For the separation of the transmitted and received signals, therefore, a suitable frequency filtering is required with which, on the one hand, the transmission signals from the transmitter to the antenna and, on the other hand, the received signals are transmitted from the antenna to the receiver. For the division of the transmission and reception ^¬ signals or for merging or separation of mobile bands today, inter alia, high-frequency filter in cavity construction used. Two or more interconnected filter paths thereby form a so-called diplexer or triplexer that chen a largely decoupled interconnection of Sen ^¬ countries and receivers to a common antenna enable. With this, different frequency bands (eg mobile radio bands) can be split (decoupled). In ^¬ example, a pair of high-frequency filters are used, both of which a specific frequency band to ^¬ let (bandpass filter). Alternatively, a pair of high frequency filters may be used, both of which block a particular frequency band (bandstop filter). Further, a pair can be used by high-frequency filters of which one filter frequencies below a frequency between the transmission and reception band lets through and frequencies above that frequency blocks (Tiefpassfil ^¬ ter), and the other filter frequencies below a frequency between transmit and receive bands locks and passes overlying frequencies (high-pass filter). Other combinations of the aforementioned filter types are also conceivable.

It is also possible to provide a plurality of filters having a different passband for the transmission path and the reception path. This means that there are several high-frequency filters in the receive path, each of these high-frequency filters working as a so-called bandpass filter, which passes a certain frequency spectrum. This allows different Frequenzbe ^¬ rich can be singled out in individual cases and the corresponding, processing electronics can be supplied. High-frequency filters are often constructed from coaxial cavi- ty / cavity resonators, since they consist of milling ^¬ or castings, whereby they are easy to manufacture. In addition, these resonators ensure high electrical quality and a relatively large Tem ^¬ peraturstabilität.

From EP 2 073 303 Al a high-frequency filter in Koaxialbauweise is known. The high frequency filter includes various resonators. Some of these resonators are only arranged in the transmission path and others used only in the receive path, and still others in a common ge ^¬ signal path. The resonators In the send and receive paths can be switched on or off.

From US 6,806,791 Bl a high-frequency filter is known which has a plurality of separate signal paths. In each signal path, two resonators each having a resonator inner conductor are present. A common connection is galvanically connected to a common resonator rod. The common resonator rod is horizontally disposed in the high frequency filter and electrically connected at its ends to the sidewalls of the high frequency filter. The common resonator rod is not electrically connected to the housing bottom. The resonators of the individual signal transmission paths are connected to the common resonator rod coupled to the locations of the resonator at which the magnetic field has a maximum ^¬ diagram. The length of the common resonator rod is a multiple of λ / 2.

US Pat. No. 7,898,361 B1 discloses a high-frequency filter which has a plurality of resonator internal conductors comprises, which are coupled together, wherein the Re ^¬ resonators are fed via an opening in the housing bottom. From US 6, 392, 506 B2 a high frequency filter in cavity construction is known which has a plurality of resonators on ^¬, wherein a resonator as a common Zusammenschaltresonator for two signal paths / filter paths is used. Each resonator comprises a resonator chamber and a resonator inner conductor, which extends from the housing bottom in the direction of a housing cover. The resonators are usually separated from each other by an electrically leitfähi ^¬ ge wall. Between two adjacent resonators, there is a recess in this wall, so that there is a visual contact between them, whereby the resonators are electrically coupled to each other. Coupling may also be effected between two non-adjacent resonators by passing a line through the dividing wall, the corresponding resonators being coupled to this line.

However, a disadvantage of this high-frequency filter is that it is hardly possible to combine several filter paths / signal paths onto the interconnection resonator.

It is therefore the object of the invention to provide a frequency filter in Hochfre ^¬ cavity construction, having at least two filter paths, and is constructed compact.

The object is achieved by the high-frequency filter in cavity construction according to claim 1. In the respective teransprüchen are advantageous developments

specified according to the invention high-frequency filter.

The high-frequency filter according to the invention in cavity construction comprises at least two resonators, each having a resonator inner conductor, each of the at least two resonators each forming a filter path, or being part of a respective filter path. The high-frequency filter according to the invention can be used for example as a duplexer, duplexer, triplexer or generally as a multiplexer. The high-frequency filter further comprises an outer conductor housing which comprises a housing bottom, a housing cover which is at a distance from the housing bottom and a housing wall which rotates between the housing bottom and the housing cover. The at least two Re ^¬ sonator internal conductor are conductor housing with the housing bottom of the outer electrically connected and extend in the axial direction from the housing base in the direction of the housing cover. The at least two resonator inner conductors terminate at a distance from the housing cover and / or are galvanically isolated from the housing cover. The Hochfre ^¬ quenzfilter also has at least one Zusammenschaltrononator having a Zusammenschaltresonator- inner conductor, wherein the Zusammenschaltresonator- inner conductor is electrically connected to the housing bottom and extends in the axial direction of the housing bottom in the direction of the housing cover. Therefore, the interconnected resonator inner conductor is not connected to the encircling housing wall, ie the sidewall (galvanic). The Zusammenschaltresonator is coupled to the at least two resonators, that is, with the two filter paths, wherein at least the overall Zusammenschaltre ^¬ sonator via a further signal path is fed. The at least one further signal path can be inductively or capacitively coupled to the Zusammenschaltresonator. The outer surface of the interconnecting resonator inner conductor is, therefore, in contrast to the known from EP 2 073 303 AI filter arrangement, larger than each lateral surface of all resonator inner conductor, which are coupled directly to the Zusammenschaltresonator- inner conductor. The resonators (resonator and resonator inner conductor) in the shared signal path and the resonators in the transmitting and receiving path are not of equal size in the Ge ^¬ contrast to the known from EP 2073303 AI filter arrangement, but the together menschaltresonator internal conductor is larger than all other directly coupled with him resonators in the transmit and / or receive path.

The use of a so-called cooperation switch resonator which is fed by at least one further Sig ^¬ nalpfad and whose outer surface is greater than the outer surface of the remaining resonator inner conductor is advantageous. This means that this switching resonator is coupled to the at least two other resonators alike. This allows the re ^¬ sonatoren two can other as close as possible to the Zusammenschaltresonator be arranged, said two other resonators of two filter paths are separated by a wall or decoupled.

Within this application, "direct coupling" is understood to mean one resonator with another is then directly coupled when there is no further resonator between these two resonators.

In this at least one further signal path is, for example, the common signal path to the sum menanschluss which the egg can serve ^¬ ne antenna for connecting at least. It is also possible for the at least one further signal path to be a coupling to a further resonator.

This structure allows a third and / or a fourth and / or a fifth resonator or further resonators to be coupled to the interconnection resonator, these resonators forming a third and / or fourth and / or fifth filter path or part of such a filter path. The Zusammenschaltresonator serves as a central Kop ^¬ pelglied to couple the at least one further signal path with the filter paths. As a result, a star-shaped structure is realized.

In one embodiment, at least two resonator inner conductors are coupled directly to the same side of the interconnection resonator inner conductor. A coupling on the same side takes place when at least two resonator inner conductors are directly coupled to the interconnected resonator inner conductor, wherein Gera ^¬ den by the shortest connection between each resonator inner conductor to a point of impact on the shell surface of the Zusammenschaltresonator Inner conductor, run ^{¬ in} particular in the circumferential direction of the lateral surface, such that at least one so formed acute angle between each two straight lines is less than 70 ° or preferably less than 60 °. By using the interrupter resonator inner conductor according to the invention, two, three, four or more resonator inner conductors can be coupled directly to it. These multiple resonator inner conductors are then connected on the same side with the Verschavertresonator inner conductor, if for each possible pair of straight lines each of such ge ^¬ formed acute angle is less than 70 ° or preferably less than 60 °. Also, at least one resonator inner conductor and at least one further signal path can be arranged on the same side of the interrupter resonator inner conductor. For this the above conditions apply. Good results are achieved, for example, when each side of the interrupter resonator inner conductor is directly coupled to at least one, preferably exactly one resonator, inner conductor of a filter path or the at least one further signal path. It is also advantageous if at least one side of cooperation schaltresonator internal conductor is not coupled with other filter ^¬ paths or the further signal path. Au ^¬ ßerdem is an advantage if all filter paths and optionally additionally the further signal path on one side of Zusammenschaltresonator inner conductor with the ^¬ sem are coupled. The coupling can also be done via a corner of the interlocking cavity inner conductor with this. The cross-sectional shape of the collapsible resonator inner conductor preferably corresponds in plan view to a square or a rectangle or an oval or a circle or a regular or irregular n-polygon or approximates it.

Furthermore, there is an inventive advantage when the interrupter resonator inner conductor and / or at least one resonator inner conductor of at least one filter path has a directed in the direction of the housing cover longitudinal recess, so if the recess of the housing cover opposite the end-side end of the interrupter resonator inner conductor and / or extends from the at least one resonator inner conductor in the direction of the housing bottom. This causes a reduction in head capacity. It is also advantageous if at least one resonator inner conductor of at least one filter path and / or the cooperation schaltresonator inner conductor having a longitudinal recess, which may for example serve to receive a Abstimmele ^¬ ment and the running at least in a partial height in the axial direction in the resonator Inner conductor and / or is provided in the interlocking cavity inner conductor. Such a tuning element can be pushed either over the housing bottom through the resonator inner conductor and / or through the interrupter cavity inner conductor, wherein it then extends in the direction of the housing cover. But it can also be introduced by the Ge ^¬ housing cover, where it then extends in the direction of the resonator inner conductor and / or the making-up menschaltresonator internal conductor. Characterized Kgs ^¬ NEN the individual resonators are tuned with respect to their resonance frequency, which is adjustable, for example, the pass band of the respective filter path. Another inventive advantage is when at least one resonator inner conductor of a filter path is coupled via a bridge with the Zusammenschaltresonator- inner conductor, that is connected, wherein the web is galvanically connected to the housing bottom, the resonator inner conductor and the Zusammenschaltresonator inner conductor and in axial direction extends from the housing bottom in the direction of the housing cover, but less than 80% of the height, preferably less than 40% of the height, more preferably less than 30% of the height, more preferably less than 20% of the height, more preferably less than 10% the height, but more than 1% of the height of the Resona ^¬ tor inner conductor has. Such a bridge serves to reinforce the inductive coupling between the corresponding resonator and the switch-on resonator.

Such an arrangement by means of a Zusammenschaltre ^¬ sonator allows at least two, preferably all Re ^¬ resonators, which are coupled directly to the Zusammenschaltresonator continue from each other by a wall which is galvanically connected to the housing bottom and in the axial direction of the housing bottom in the direction extends the housing cover and is also electrically connected to this, are separated so that the coupling of the individual resonators of different filter paths with each other by at least a factor of 10, preferably the factor 30, more preferably the factor 50, more preferably a factor of 100 is less than that Kopp ^¬ development of the individual resonators to the Zusammenschaltre- sonator. This allows a very good decoupling between the individual filter paths. It is also particularly advantageous that the interconnected resonator can be tuned to a resonant frequency of a filter path coupled directly to it. This means that the switch-off cavity is part of a filter path. The selectivity of the corresponding filter path to which this resonator belongs is thereby increased.

Various embodiments of the invention will now be described by way of example with reference to the drawings. Same objects have the ^¬ same references. The corresponding figures of the drawings show in detail:

Figure 1A: a simplified representation in plan view of a section of the invention

High frequency filter, wherein the interrupter resonator inner conductor has an elongated shape; FIG. 1B shows a simplified spatial representation of the high-frequency ^{filter according} to the invention, where ^{¬ has} an elongated shape in the ^{interrupter cavity} inner conductor; 2A shows a simplified representation of a top view of the inventive Hochfrequenzfil ^¬ ter, with different resonator inner conductor gekop- additionally via a web with the inner conductors are Zusammenschaltresonator- pelt;

FIG. 2B shows a simplified spatial representation of the high-frequency filter according to the invention, FIG. in the case of different resonator inner conductors, they are additionally coupled via a web to the interconnected resonator inner conductor;

FIG. 3A shows a simplified illustration in plan view of the high frequency ^{filter according} to the invention, the ^{interrupter cavity} inner conductor having a longitudinal recess directed in the direction of the housing cover;

Figure 3B is a simplified spatial representation of the high-frequency filter according to the invention, which has a ^¬ addressed ended in the direction of the housing cover in the longitudinal recess Zusammenschaltresonator internal conductor; and

Figure 4 is a simplified representation in plan view of the inventive Hochfrequenzfil ^¬ ter, wherein explains how many re sonator inner conductor with one side of the Zusammenschaltresonator- inner conductor are directly coupled.

Figure 1A shows a simplified representation in plan sees a section of the high frequency filter 1 according to the invention with a Zusammenschaltresonator 2, wherein the Zusammenschaltresonator inner conductor 3 of the supply sammenschaltresonators 2 has an elongated shape in cross-section has ^¬.

This means that the interrupter cavity inner conductor 3 has two long, opposite sides which are more than 3 times, or 4 times, preferably more than 5 times, or more preferably more than 6 times, or 7 times as long, or even longer, like the other two short, opposite ones Pages. The composite resonator inner conductor 3 is a rectangle, the two opposite short sides being formed from a semicircle or a circle segment. Within FIG. 1A, four filter paths 4, 5, 6, 7 are coupled to the interlocking resonator 2. This means that a first resonator 4i, a second resonator 5i, a third resonator 6i, a fourth resonator 1i are coupled directly to the collapsing resonator 2. Each resonator 4i, 5i, 6i, 1 _\ consists of a Re ^¬ sonatorkammer 4i _a, 5i _a, 6i _a, _ia 7 and a resonator inner conductor 4 _lb, 5i _b, 6i _b, 7 _lb.

In the embodiment, serve three filter paths 4, 5, 6, as can be seen by the direction of the arrow to the filter by the end Zusammenschaltresonator 2 in this injected signals in receiving direction, that a corresponding frequency band to be ^¬ limit. For this purpose, the first filter path 4 comprises a further resonator 4 ₂ , which is coupled to the first resonator 4 i. This further resonator 4 ₂ is predominantly coupled to the first resonator 4 i, which means that the coupling between the further resonator 4 ₂ with the first resonator 4 i preferably by a factor of 20, more preferably by a factor of 50, more preferably by the factor 100 is higher than the coupling of the further resonator 4 ₂ with the interconnected resonator 2. This also applies to other resonators, not shown. The same applies to the second filter path 5, which also has a wide ^¬ ren resonator 5 ₂ . The third filter path 6 also has a further resonator 6 ₂ .

The fourth filter path 7 is used, as is apparent from the arrow Rich ^¬ tung, to a signal generated bezüg ^¬ Lich any interference components to filter such that this signal includes only a specific frequency band, WO in this signal by a further resonator I2 of the fourth Filter path 7 is transmitted to the resonator Ii by coupling. The resonator Ii transmits this signal to the interconnection resonator 2. The fourth filter path 7 is a filter path 7 in the transmit path, whereas the other filter paths 4, 5, 6 are filter paths 4, 5, 6 in the receive path , The interconnection of the filter paths 4, 5, 6, 7 with the Zusammenschaltresonator 2 can be made inductively and / or capacitively.

All resonator inner conductors 4 _ib , 5i _b , 6i, 7 _ib are galvanically connected to the housing bottom of the outer conductor housing 9 and extend in the axial direction from the housing bottom in the direction of a Gehäuseede- not shown. In this case, the resonator inner conductor 4 _ib , 5i _b , 6i _b , 7i end at a distance from the Gehäusede ^¬ ckel not shown and / or are galvanically isolated from the housing cover, not shown. Such galvanic isolation can be done for example by an insulating coating.

The same applies to the Verschaltresononator- inner conductor 3, which also with the housing bottom is electrically connected and in the axial direction of

Caseback extends in the direction of the housing cover, not shown. The lateral surface 10 of the interrupter resonator inner conductor 3 is larger than each lateral surface 4i _c , 5i _c , 6i _c , Ί i _c all resonator inner conductor 4 _ib , 5i _b , 6i _b , 7 _ib , directly to the interlocking cavity inner conductor 3 are coupled. The lateral surface of the corresponding resonator inner conductor, in this case that of the interconnection resonator inner conductor 3, is meant by a lateral surface. The top and bottom of the Zusammenschaltresonator inner conductor 3 are not to the envelope surface 10. In the top and bottom of Zusammenschaltresonator inner conductor 3, it is the faces that are parallel to the Ge ^¬ housing bottom and / or the housing cover. This ^¬ be indicated that it is menschaltresonator inner conductor 3 is at the lateral surface 10 of the together around the area which is preferably perpendicular, or at least not aligned parallel to the housing bottom and / or the housing cover. An inclined surface would preferably still count to Man ^¬ telfläche 10. It is also possible for the lateral surface 10 of the co-resonator inner conductor 3 to be more than 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90%, or 100%, or 110%, or 150%, or 200% greater than the lateral surface 4i _c , 5i _c , 6i _c , 1 _{lc of} one or the smallest or the largest of the at least further directly with it coupled resonator inner conductor 4i _b , 5i _b , 6i _b , 7i _{b of} the first resonators 4i, 5i, 6i, 7i. It is also possible for the lateral surface 10 of the interconnected internal resonator inner conductor 3 to be larger than the lateral surfaces 4i _c , 5i _c , 6i _c ,

all right overall coupled with him resonator inner conductor 4 _ib, 5i _b, 6i _b, 7 _ib together ^¬ men. This means that the interrupter resonator inner conductor 3 is correspondingly enlarged if another resonator inner conductor 4i _b , 5i _b , 6i _b , 7 _{ib is} to be coupled directly to it.

The lateral surface 10 of the Zusammenschaltresonator- inner conductor 3 may also be greater than 50%, in particular greater than 70%, or 90%, or 100% of Mantelflä ^¬ Chen 4i _c , 5ic, 6ic, 7i _c all coupled directly to it resonator inner conductor 4i _b , 5i _b , 6i _b , 7 _ib together.

It is also possible for the lateral surface 10 of the interconnected internal resonator 3 to be more than 1.2 times or preferably more than 1.5 times or more preferably more than 2 times or more preferably by more than 3 times or more preferably by more than 4 times greater than the lateral surfaces 4i _c , 5ic _/ 6ic, 7i _c all directly coupled with resonator In ^¬ nenleiter 4i _b , 5i _b , 6i _b , 7i _b together. This will reliably prevented that different filter paths 4, 5, 6, 7 with ^¬ must be coupled at least partially to its first resonator today. It is thus possible that all filter paths 4, 5, 6, 7 can be coupled directly to the cou- ^¬ human resonator 2.

Of course, the volume of the interconnector resonator 3 may be greater than 50%, or 80%, or 100%, or 110%, or 150%, or 200% of the volume of all resonator inner conductors 4 _ib , 5i _b , 6i _b , 7 _ib together.

Furthermore, it is shown that the interconnection resonator 2 is fed via at least one further signal path 11. The feed through the at least one further signal path 11 is preferably capacitive. An inductive power supply is also possible. The at least one further signal path 11 is also the so-called common signal path 11, which can serve for connection to at least one antenna. It is also possible that, the at least one further signal path 11 is a coupling to a wide ^¬ ren shown only in Figure 3A resonator 31st

Within FIG. 1A, all the resonators 4i, 5i, 6i of the filter paths 4, 5, 6 are coupled to one side, which is preferably one of the long sides of the switch resonator inner conductor 3. The resonator inner conductors 4i _b , 5i _b , 6i _b , which are resonators 4i, 5i, 6i of the filter paths 4, 5, 6, which are coupled directly to the interlocking cavity inner conductor 3, are aligned with each other ^¬ directed. This means that they all lie on a straight line, the straight line at preferably parallel to the lan ^¬ gen side of the inner conductor 3 Zusammenschaltresonator ^¬ sorted. The filter paths 4, 5, 6 are also aligned ^{¬ at} least partially parallel to each other. However, it is also possible, that the distance of re sonator internal conductor 4i _b, 5i _b, 6i _b of the first resonators 4i, 5i, 6i each filter path 4, 5, is selected wholly or partially different from the combination ^¬ schaltresonator 2 6 , The high-frequency filter 1 in cavity construction therefore has at least two filter paths 4, 5, 6, which go away from one half of the Zusammenschaltresonators 2 and are nevertheless sufficiently decoupled. This also makes it compact.

The fourth resonator Ii, which is arranged in the filter path 7, is arranged on the other long side of the collapsible resonator inner conductor 3 and coupled therewith.

Shown is also that the majority of the resonators ^¬ gates 4 i, 5 i, 6 i, 1 _\ is coupled overall with one of the two long sides, and that the at least one further signal ^¬ path 11 to Zusammenschaltresonator 2 on its other long side or feed on one of the two shorter sides. It can therefore be said that the resonator Ii, which belongs to the filter path 7, gekop ^¬ pelt is coupled to a first, preferably long side of the interrupter resonator inner conductor 3, whereas the resonators 4 i, 5 i, 6 i, the filter to the paths 4, 5, 6 belong to another, preferably also long, more preferably gegenüberlie ^¬ ing side of the interrupter resonator inner conductor 3 are arranged. Other filter paths, not shown, can also be formed between the common signal path 11 and the filter path 7.

All resonators 4 i, 5 i, 6 i, Ii, which are coupled directly to the Zusam ^¬ human resonator 2, are separated from each other by a wall 12 or by the Zusammentraltresona- Gate 2 itself separated such that the coupling of the individual resonators ^¬ 4i, 5i, 6i, 7i with each other by at least a factor of 10 is less than the coupling of the individual resonators 4i, 5i, 6i, 7i with the collapsible resonator. The wall 12 is also galvanically connected to the Ge ^¬ housing bottom and extending in the axial direction of the housing bottom in the direction of the housing cover, not shown, and is optionally galvanically connected thereto.

All resonator inner conductors 4 _ib, 5i _b, 6i _b, 7 _ib, which are before Trains t ^¬ directly coupled to the inner conductor Zusammenschaltresonator-3, have a, preferably the same distance towards the latter. It is also possible that al-le resonator inner conductor 4i _b, 5i _b, 6i _b, 7 _ib each other the same distance from the respective adjacent resonator inner conductor 4i _b, 5i _b, 6i _b, 7i _b, which is also directly connected to the Interlocking resonator inner conductor 3 is coupled. Optionally, this applies only to those resonator inner conductors 4 _ib , 5i _b , 6i _b , 7 _ib , which are arranged in the receiving path or transmission path.

The Zusammenschaltresonator 2 can additionally be tuned to the frequency of a directly coupled with him filter path 4, 5, 6, 7, whereby the selectivity of the filter path 4, 5, 6, 7 increases with this additional Zu ^¬ sammenschaltresonator 2.

It is also possible for the interrupter resonator inner conductor 3 to consist of a dielectric which is coated with an electrically conductive layer. FIG. 1B shows a simplified spatial representation of the high-frequency filter 1 according to the invention, wherein the interlocking cavity inner conductor 3 has an elongated shape. FIG. 1B is a perspective view of the plan view of FIG. 1A. This spatial representation helps the formation and the spatial dimensions of the lateral surfaces 10, 4i _c, 5i _c, 6ic, 7i _c of Zusammenschaltresonator inner conductor 3 and the resonator inner conductors 4 _ib, 5i _b, 6i _b, 7 to comparable _ib better stand.

The circumferential surface 10 of the inner conductor Zusammenschaltresonator-3 is greater than each of the lateral surfaces 4ic _/ 5ic, 6ic, _c 7i of all the direct tor inner conductor with him coupled Resona- _b 4i, 5i _b, 6i _b, 7 _ib. Preferably, this lateral surface 10 of the Zusammenschaltresonator inner conductor 3 is also more than half as large or larger than the lateral surfaces 4i _c , 5i _c , 6i _c , 1 _{\ c} all directly coupled to him resonator inner conductor 4i _b , 5i _b , 6i _b , 7 _ib together. Preferably, lateral surface 10 of the interconnection resonator inner conductor 3 is also larger than the sum of all lateral surfaces 4i _c , 5i _c , 6i _c , 1 _{c of} all directly coupled thereto resonator inner conductor 4 _ib , 5i _b , 6i _b , 7 _ib , Shown is also that the further signal path 11, wherein it is in the embodiment of Figure 1B by a common signal path, via a bushing 13, which ver ^¬ passes through the housing wall 12, is led out of the high-frequency filter. 1 This duct 13, at least one white ^¬ direct signal path 11 are connected to an unillustrated terminal of the sum. At this summing terminal An antenna or an unillustrated antenna array can be connected.

Figure 2A shows a simplified representation in plan view looks at the inventive high frequency filter 1, wherein different resonator inner conductors 4 _ib, 5i _b zusätz ^¬ Lich via a crosspiece 20 connected to the Zusammenschaltresonator- inner conductor 3 are therefore coupled. In the exemplary embodiment from FIG. 2A, the cross-sectional shape of the interrupter resonator inner conductor 3 corresponds to a rectangle. It is also possible that the cross-sectional shape of the interrupter resonator inner conductor 3 in plan view corresponds to or approximates a square or an oval or a circle or a regular or irregular n-polygon. The corners of the interrupter resonator inner conductor 3 are preferably rounded. The resonator inner conductor 4 _ib is connected via the web 20 with a side in which it preferably han ^¬ delt around a long side of the interrupter resonator inner conductor 3, connected. The interrupter resonator inner conductor 3 has a rectangular cross-sectional shape in plan view. The web 20 has, for example, a concave shape, wherein the two ends of the web 20 are preferably spread apart. This means that the web 20 is narrower in its middle between the at least one resonator inner conductor 4i or 5i _b and the Zusammenschaltresonator- inner conductor 3, as at its ends, which with the interlocking resonator inner conductor 3 or with the resonator inner conductors 4 _ib , 5i _{b are} connected. The web 20 is connected to the housing bottom, the resonator Inner conductor 4 _ib , 5i _b and the Verschalttresonator- inner conductor 3 is electrically connected. It extends in the axial direction from the housing bottom in the direction of the housing cover, not shown, but has less than 80% of the height, preferably less than 50% of the height further be ^¬ vorzugt less than 30% of the height, more preferably Weni ^¬ ger than 20% the height, more preferably less than 10%, but still more than 1% of the height of the resonator inner conductor 4i, 5i _b on. Such a web 20 serves to reinforce the inductive coupling.

Within Figure 2A, there is a third resonator 6i which is directly coupled to the interconnect resonators ^¬ tor. 2 This third resonator 6i is not inductively coupled via a web 20 with the Zusammenschaltre ^¬ sonator 2 additionally. It is therefore possible that some resonators 4i, 5i are also inductively coupled, for example by means of a web 20 with the Zusammenschaltresonator 3, whereas other resonators have 6i no additional inductive coupling with the ^¬ together menschaltresonator. 3 Nevertheless, all the resonators 4i, 5i, 6i, Ii are those which are directly coupled to the switch-on cavity 2. The web 20 can be flanged both on one side of the collapsible resonator inner conductor 3, as well as at one of its corners.

The web 20 is preferably made of the same material from which the resonator inner conductor 4 _ib , 5i _b , 6i _b , 7 _ib and the interrupter resonator inner conductor 3 consist. It is also possible that the web 20 consists of a Dielekt ^¬ rium, which is coated with a metal layer and is manufactured separately. Such a web 20 may during the production process between a resonator inner conductor 4 _ib, 5i _b and the collapse schaltresonator inner conductor 3 are inserted or retrofitted later. In this case, the web 20 would preferably also be fixed in position with a screw connection and / or adhesive connection. Incidentally, all resonator inner conductors 4i _b , 5i _b , 6i _b , 7i _b , 3 may consist of a dielectric, which is coated with a metal layer. In the exemplary embodiment from FIG. 2A, the combination resonator 2 serves for coupling the resonators 4i, 5i, 6i, with the at least one further signal path 11.

Also in the embodiment of Figure 2A, the outer surface 10 of the Zusammenschaltresonator inner conductor 3 is larger than each lateral surface 4i _c, 5i _c, 6i _c of the resonators ^¬ tor internal conductor 4i _b, 5i, 6i _b, the schaltresonator- directly with the cooperation Inner conductor 3 are coupled. 2B shows a simplified spatial representation of the high frequency filter 1 according to the invention, wherein ver ^¬ different resonator inner conductors 4 _ib, 5i _b are additionally coupled by a web 20 to the inner conductor Zusammenschaltresonator-. 3 In the exemplary embodiment of FIG game 2B is a perspective view of that shown in plan view Ausführungsbei ^¬ game of Figure 2A. To recognize is that the Hö ^¬ height of the web 20 is lower than the height of Resona- Gate inner conductor 4 _ib , 5i _b and the height of the interconnecting resonator inner conductor. 3

The corners of the interlocking cavity inner conductor are rounded off in the embodiment of FIG. 2B. However, these can also be bevelled.

Within FIG. 2B, a further resonator 5 _{2 is shown} within the second filter path 5. This further resonator 5 ₂ is predominantly coupled only to the two ^¬ th resonator 5 i. Coupling of the other resonator 5 ₂ with another resonator, such as the example ^¬ Zusammenschaltresonator 3, preferably by more than a factor of 100 less pronounced than the coupling to the second resonator 5i. Within FIG. 2B, only sections of the high-frequency ^{filter are} shown. Each filter path 4, 5, 6 may still have other, not shown resonators. Figure 3A shows a simplified view in top plan ^¬ view of the inventive high frequency filter 1, where ^¬ having at Zusammenschaltresonator inner conductor 3 is directed in the direction of the housing cover longitudinal recess 30th Such a longitudinal recess 30 serves to reduce the head capacity. The longitudinal recess 30 extends from the, the housing cover opposite the front end of the Zusammenschaltresonator- inner conductor 3, in the direction of the housing bottom. The man ^¬ telfläche 10 is not interrupted by the longitudinal recess 30. The longitudinal recess 30 can be seen only in plan view. Within the embodiment of FIG. 3A, there is no further signal path 11, which is a common signal path for connection to at least one antenna or to an antenna array. Instead, it is in the at least one further signal ^¬ path 11 by a coupling to another filter path 31 to the resonator 31i. This further filter path 31 can have any desired number of resonators in addition to the at least one resonator 31i. The Zusammenschaltresona- gate 2 serves a coupling between the further resonator 31i, and the resonators 4i, 5i, 6i provide Ii near, ^¬. Due to the described enlarged lateral surface 10 of the Zusammenschaltresonators 2 is a ranging from ^¬ coupling between this and the resonators can 4i, 5i, 6i, 1 _\ and the further resonator 31i are produced. The high frequency filter 1 can therefore be made very compact.

Within Figure 3A is not illustrated, that the resonator inner conductors 3, 4 _ib, 5i _b, 6i _b, 7 have _ib Längsaus- a recess, which serve for receiving a non Darge ^¬ presented tuning. Through such From ^¬ voting element, the resonance frequency of the corresponding resonator 2, 31i, 4i 5i, 6i can be changed 1 _\.

FIG. 3B shows a simplified spatial representation of the high-frequency filter 1 according to the invention, wherein the intercalated resonator inner conductor 3 has a longitudinal recess 30 directed in the direction of the housing cover. In the embodiment of Figure 3B is a three-dimensional view of the embodiment of Figure 3A shown in plan view. The longitudinal ^¬ recess 30 may have a depth that the height of the interrupter resonator inner conductor 3 corresponds. The depth of the longitudinal recess 30 can also be only 50% of the height of the interrupter resonator inner conductor 3 corre ^¬ chen. The longitudinal recess 30 may include a volume, preferably more than 40% more than 50%, more be ^¬ vorzugt more than 60%, more preferably more than 70%, more preferably more than 80% but less than 90% of the volume of the Interrupter resonator inner conductor 3 comprises. The corners within the longitudinal recess 30 may also be rounded and / or bevelled. The longitudinal recess 30 is also preferably produced within a milling process. The longitudinal recess 30 can also be designed such that it preferably comprises a male tuning element positively fit and / or receives a tuning element in other known ways.

The interrupter resonator inner conductor 3 and / or at least one, preferably all of the other resonator inner conductors 4 _ib , 5i _b , 6i _b , 7 _ib are integrally formed.

Figure 4 shows a further embodiment of the high frequency filter ^¬ 1. In Figure 4, the resonator inner conductors are disposed _b 6i and 7i closer to each other than the resonator inner conductor 4i and 5i _b _b. Nevertheless, both the resonator inner conductor 6i _b and 7i _b and the resonator inner conductor 4i and 5i _{b are} each coupled directly to one side of the interconnected resonator inner conductor 3 with this. In order to determine whether none, one or more resonator inner conductors 4 _ib , 5i _b , 6i _b , 7 _ib and / or further signal paths 11 are coupled to one side of the resonant cavity inner conductor 3, this is an imaginary line 40a, 40b, 41a, 41b, 42 viewed through the respective resonator inner conductor 4 _ib , 5i _b , 6i _b , 7 _ib and / or other signal paths 11. This ^¬ thought straight line 40a, 40b, 41a, 41b, 42 connects the respective resonator inner conductor 4i _b , 5i _b , 6i _b , 7 _ib and / or the other signal paths 11 with the outer surface 10 of the interrupter resonator inner conductor 3 shortest way. The imaginary straight lines 40a, 40b, 41a, 41b, 42 duri ^¬ fen preferably through the center of the respective re sonator internal conductor 4i _b, 5i _b, 6i _b, 7 _ib and / or the wide ^¬ ren signal path 11, to a respective Impact point on the lateral surface 10 of the interrupter resonator inner conductor 3. Between the individual lines 40a, 40b, 41a, 41b, 42 of those resonator inner conductor 4 _ib , 5i _b , 6i _b , 7 _ib , on the same side of the interrupter resonator inner conductor. 3 Coupling, an acute angle is gebil ^¬ det, which is smaller than 70 ° or preferably less than 60 °. 4, the resonator inner conductors 6i _b , 7i _b couple directly to the same side of the interrupter resonator inner conductor 3, because the imaginary straight lines 40a, 40b, the resonator inner conductors 6i _b , 7i _b on the shortest path with the lateral surface 10th connect the Zusammenschaltresonator- inner conductor 3, enclose an angle of 0 ° (parallel) to each other in the direction of rotation. If the resonator inner conductor 7i _{b arranged} on the opposite side of the interrupter resonator inner conductor 3, then the angle would be 180 °.

The resonator inner conductors 4i _b , 5i _b couple directly to the same side of the Verschavertresonator- inner conductor 3, because the imaginary lines 41a, 41b, the connect the resonator inner conductor 4 _ib , 5i _b on the shortest path, each with a point of impact on the lateral surface 10 of the interrupter resonator inner conductor 3, run such that an acute angle thus formed between see these two straight lines 41a, 41b is smaller than 70th ° or preferably less than 60 °.

On the other hand, it looks different between the resonator inner conductor of the further resonator 31 i and the resonator inner conductors 5i _b and 7 i _b . All three resonator inner conductors 5i _b , 7 i are coupled directly to this at different sides of the interrupter resonator inner conductor 3. A thus formed acute angle between the imaginary straight lines 40b, 41b, the resonator inner conductor 7 _ib, 5i _b connect the shortest route with a respective point of impingement on the outer surface 10 of the cooperation schaltresonator inner conductor 3, is almost 180 ° in size and thus greater than 60 ° or 70 °. Therefore, these resonator inner conductors 7 _ib , 5i _{b are} coupled directly to this on different sides of the interrupter resonator inner conductor 3. The same applies to the straight lines 41b and 42 or 40b and 42. An acute angle between these straight lines is also greater than 70 °. The angle is measured between two straight lines 40a, 40b, 41a, 41b, 42. Starting the measurement at a point on the line 40a, 40b, 41a, 41b, 42, between the resonator inner conductors 4 _ib, 5i _b, 6i _b, 7 _ib and the impingement ^¬ point is located on the lateral surface 10th The measurement then takes place at the second point on the other straight line 40a, 40b, 41a, 41b, 42, the measurement taking place in the circumferential direction of the lateral surface 10. All impact points are equidistant from the housing bottom, which is important. tet that all the lines 40a, 40b, 41a, 41b, 42 are in the same plane.

The examination of whether a plurality of resonator inner conductors 4 _ib , 5i _b , 6i, 7i are coupled directly to the same side of the interrupter resonator inner conductor 3, regardless of its shape. The Zusammenschaltresonator- inner conductor 3 could also be round or oval.

The invention is not limited to the described embodiments. In the context of the invention, all described and / or drawn features can be combined with each other as desired.

Claims

1. High-frequency filter (1) in cavity construction, wherein the high-frequency filter (1) has the following features:

the high-frequency filter (1) comprises at least two resonators (4ι, 5ι, 6ι, Ί i), each with a resonator inner conductor (4i _b , 5ib, 6ib, 7ib), each of the at least two resonators (4i, 5i, 6i , 7i) each egg ^¬ nen filter path (4, 5, 6, 7) forms or part of each of a filter path (4, 5, 6, 7);

an outer conductor housing (9) comprising a housing bottom, a housing cover spaced from the housing cover and a housing wall and the housing cover encircling housing wall;

the at least two resonator inner conductors (4i _b , 5i, 6ib _/ 7ib) are galvanically connected to the housing bottom of the outer conductor housing and extend in the axial direction from the housing bottom in the direction of

Housing cover;

the at least two resonator inner conductors (4i _b , 5i, 6ib _/ 7ib) terminate at a distance in front of the housing cover and / or are galvanically separated from the housing cover; - At least one Zusammenschaltresonator (2) having a Zusammenschaltrononator inner conductor (3), wherein the Zusammenschaltresonator inner conductor (3) is galvanically connected to the housing bottom and extends in the axial direction from the housing bottom in the direction of the housing cover;

the interrupter resonator (2) is directly coupled to the at least two resonators (4ι, 5ι, 6ι, Ί i);

the Zusammenschaltresonator (2) is fed at least via a further signal path (11);

characterized in that the high-frequency filter still has the following feature:

- A lateral surface (10) of the Zusammenschaltresonator- inner conductor (3) is greater than each lateral surface (4 7i _c ) of all resonator inner conductor (4i,

5ι, 6i, 7i), which are directly coupled to the Zusammenschaltresona- tor inner conductor (3).

2. High-frequency filter according to claim 1, characterized in that the at least one further signal path (11) is a common signal path (11) to the sum terminal and / or that at least one further signal path ( 11) is a coupling to another resonator (31i).

3. High-frequency filter according to claim 1 or 2, characterized in that a third (6i) and / or a fourth (7i) and / or a fifth resonator is coupled to the Zusammenschaltresonator (2) and / or that this a third and form or fourth and / or fifth filter path (6, 7) or are part of such a filter path (6, 7).

4. High-frequency filter according to one of the preceding claims, characterized in that the lateral surface (10) of the interrupter resonator inner conductor (3) by more than 10% or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90%, or 100%, or 110%, or 150%, or 200%, or 300% or 400% is greater than the lateral surface (4i _c , 5i _c , 6i _c , 1 _lc ) of one or the smaller of the at least two further directly coupled thereto resonator inner conductor (4i _b , 5i _b , 6i _b , Ί i _b )

5. High-frequency filter according to one of the preceding claims, characterized in that the lateral surface (10) of the Zusammenschaltresonator inner conductor (3) is greater than 50%, in particular greater than 70%, or 90%, or 100% of the lateral surfaces (4i _c , 5i _c , 6i _c , 1 _lc ) of all directly coupled to him resonator inner conductor (4i _b , 5i _b , 6i _b , 7i) together, or that the lateral surface (10) of the composite resonator inner conductor (3) by more as 1.2 times, or preferably more than 1.5 times or more, more preferably more than 2 times or more preferably more than 3 times, or even more preferably more than 4 times larger is, as the lateral surfaces (4i _c , 5i _c , 6i _c , 1 i _c ) of all directly coupled to him resonator inner conductor (4i _b , 5i _b , 6i _b , 7 _ib ) together.

6. High-frequency filter according to one of the preceding claims, characterized in that the volume of the collective internal resonator inner conductor (3) is greater than 50%, or 80%, or 90%, or 100%, or 110%, or 150%, o- the 200% of the volume of all directly coupled to him resonator inner conductor (4i _b , 5i _b , 6i _b , 7 _ib ) together. 7. High-frequency filter according to one of the preceding claims, characterized in that at least two resonator ^¬ tor inner conductor (4i _b , 5i _b , 6i _b , i _b ) with the collapsible resonator inner conductor (3) are directly coupled, wherein straight lines (40a, 40b, 41a, 41b, 42) through the kürzes ^¬ te connection between each cavity inner conductor (4 _b i, ib _5/6 ib,

7 i), each with a point of incidence on the cladding ^¬ surface (10) of the Zusammenschaltresonator internal conductor (3) extend such that at least one so formed spit ^¬ zer angle (between two straight lines 40a, 40b, 41a, 41b, 42) is less is greater than 70 ° or preferably less than 60 °.

8. High-frequency filter according to one of the preceding claims, characterized in that at least one Resona ^¬ tor inner conductor (4 i _b , 5 i _b , 6 i _b , 7 ib) of a filter path (4, 5, 6, 7) and at least one further signal path (11) are coupled directly to the interrupter resonator inner conductor (3), whereby straight lines (40a, 40b, 41a, 41b, 42) are formed by the shortest connection between the at least one resonator inner conductor ( _4b , _5b) , 6 i _b, _{i b)} and the at ^¬ least one further signal path (11) (in each case an up ^¬ meeting point on the outer surface 10) of the Zusammenschalt- resonator inner conductor (3) run 7 such that at ^¬ least one so formed acute angle between each two straight lines (40a, 40b, 41a, 41b, 42) is less than 70 ° or preferably less than 60 °.

9. High-frequency filter according to one of the preceding claims, characterized in that the cross-sectional shape of the interrupter ^resonator inner conductor (3) in ^plan view ^{¬ a} view

- square; or

- a rectangle; or

- an oval; or

- a circle; or - equals or approximates a regular or irregular n polygon.

10. The high-frequency filter according to claim 9, marked thereby characterized, that the cross-sectional shape of the Zusammenschalt- resonator inner conductor (3) in plan view corresponds to a langgezo ^¬ genes rectangle with two long, GE ^¬ opposite sides more than 3 times, preferably more than 5 times, more preferably more than 7 times as long as the other two short, opposite sides and that the plurality of resonators (4i, 5i, 6i, Ii) is coupled to one of the two long sides and / or that the at least one further signal path (11) feeds the ^{interlocking cavity} inner conductor (3) via its other long side or via one of the two short sides.

11. High-frequency filter according to claim 9 or 10, characterized in that the corners of the Zusammenschaltresona- tor inner conductor (3) are rounded and / or bevelled.

12. High-frequency filter according to one of the preceding claims, characterized in that the interconnection resonator inner conductor (3) and / or that the at least one resonator inner conductor (4i _b , 5i _b , 6i _b , Ί ib) at least one filter path (4 , 5, 6, 7) has a directed in the direction of the housing ^¬ lid longitudinal recess (30).

13. High-frequency filter according to claim 12, characterized in that the longitudinal recess (30) receives a tuning ^element .

14. High-frequency filter according to one of the preceding claims, characterized in that at least one Resona ^¬ tor inner conductor (4i _b , 5i _b , 6i _b , 7i _b ) of a filter path (4, 5, 6, 7) via a web (20) is coupled to the interconnection resonator inner conductor (3), wherein the web (20) with the housing bottom, the resonator inner conductor (4i _b , 5i _b , 6i _b , 7i _b ) and the Zusammenschaltresonator- inner conductor (3) galvanically connected and extending in the axial direction from the housing bottom in the direction of the device covers sedeckels, but less than 80% of the height, be ^¬ vorzugt less than 40% of the height, more preferably Weni ^¬ ger than 30% of the height, more preferably less than 20 % of the height, more preferably less than 10% of the height, but more than 1% of the height of the resonator inner conductor (4i _b , 5i _b , 6i _b , 7i _b ).

15. High-frequency filter according to claim 14, characterized in that the web (20) in its center between the at least one resonator inner conductor (4 _ib , 5i _b , 6i _b , 7i _b ) of a filter path (4, 5, 6, 7) and the interrupter resonator inner conductor (3) is narrower than at its end, which adjoins the interrupter resonator inner conductor (3) and / or which adjoins the resonator inner conductor (4i _b , 5i _b , 6i _b , i _b ) anschießt.

16. High-frequency filter according to claim 14 or 15, characterized in that the web (20) is connected at one end to egg ^¬ ner side or at a corner of the Zusammenschaltresona- tor inner conductor (3) to this.

17. High-frequency filter according to one of the preceding claims, characterized in that at least two, preferably all ^¬ resonators (4i, 5i, 6i, Ii), directly with the Interlocking resonator (3) are coupled to each other by a wall (12) which is galvanically connected to the housing bottom and extending in the axial direction from the housing bottom in the direction of the housing cover, are separated so that the coupling of the individual resonators (4i, 5i, 6i, Ii) with each other by at least a factor of 10, preferably the factor 30, more preferably the factor 50, more preferably the factor 100 is less than the coupling of the individual resonators (4i, 5i, 6i, 1 _\ ) with the Zusammenschaltresonator ( 2).

18. High-frequency filter according to one of the preceding claims, characterized in that all the resonator inner conductor (4i _b , 5i _b , 6i _b , 7i _b ) and / or the at least one ne further signal path (11) with the same distance to the sammenschaltresonator -Inner conductor (3) are arranged and / or that all resonator inner conductor (4 _ib , 5i _b , 6i _b , 7i) with each other the same distance from each ^¬ adjacent resonator inner conductor (4 _ib , 5i _b , 6i _b , 7 _ib ) and / or that all the resonator inner conductors (4 _ib , 5i, 6i _{b /} 7i _b ) and / or the at least one further signal path (11), each with a different distance to the interconnected schaltresonator inner conductor (3) are.

19. High-frequency filter according to one of the preceding claims, characterized in that the Zusammenschaltre ^¬ sonator (2) is tuned to the resonant frequency of a filter path coupled to it (4, 5, 6, 7).

20. High-frequency filter according to one of the preceding claims, characterized in that the interconnection resonator inner conductor (3) consists of a dielectric, which is coated with an electrically conductive layer.