CN113054385A

CN113054385A - Communication equipment and filter

Info

Publication number: CN113054385A
Application number: CN201911383599.0A
Authority: CN
Inventors: 李华; 刘学鑫; 王磊; 汪俊
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29

Abstract

The application discloses communication equipment and wave filter, this wave filter includes: a housing having a first direction and a second direction perpendicular to the first direction; the first filtering branch is arranged on the shell and consists of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the first filtering branch form four cross-coupling zeros; eleven filter cavities of the first filter branch are divided into seven rows which are sequentially arranged along the second direction. The first filtering branch road of this application is regularly arranged into seven and is listed as, can produce a plurality of wave filters through same mould, reduce cost improves stability.

Description

Communication equipment and filter

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication device and a filter.

Background

In a mobile communication system, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must precisely control its bandwidth.

The inventor of the application finds that the arrangement of a plurality of filter cavities in the filter is complex and irregular in long-term research and development work, the size of the filter is increased, and the production cost is increased.

Disclosure of Invention

The application provides a communication device and a filter, which are used for solving the problems of the filter in the prior art.

In order to solve the technical problem, the application adopts a technical scheme that: there is provided a filter comprising: a housing having a first direction and a second direction perpendicular to the first direction; the first filtering branch is arranged on the shell and consists of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the first filtering branch form four cross-coupling zeros; eleven filter cavities of the first filter branch are divided into seven rows which are sequentially arranged along the second direction.

The first filtering cavities of the first filtering branch are in a row; the second filtering cavities and the third filtering cavities of the first filtering branch are in a row and are sequentially arranged along a first direction; the fifth filtering cavities and the fourth filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction; the sixth filtering cavities and the seventh filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction; the eighth filtering cavities of the first filtering branch are in a row; the tenth filtering cavity and the ninth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction; the eleventh filter cavities of the first filter branch are in one row. Eleven filter cavities of the first filter branch are regularly distributed into seven rows, and the size of the filter can be reduced.

The second filter cavity of the first filter branch is respectively adjacent to the first filter cavity, the third filter cavity and the fifth filter cavity; a fourth filtering cavity of the first filtering branch is respectively adjacent to the third filtering cavity, the fifth filtering cavity and the seventh filtering cavity; a sixth filtering cavity of the first filtering branch is respectively adjacent to the fifth filtering cavity, the seventh filtering cavity and the eighth filtering cavity; and the tenth filtering cavity of the first filtering branch is respectively adjacent to the eighth filtering cavity, the ninth filtering cavity and the eleventh filtering cavity. The plurality of filter cavities are arranged adjacently, so that the size of the filter can be reduced.

And the ninth filtering cavity and the eleventh filtering cavity of the first filtering branch are in capacitive cross coupling so as to form four cross coupling zeros of the first filtering branch. The four cross-coupling zeros of the first filtering branch can achieve the zero suppression effect, and the out-of-band suppression performance of the filter is improved.

The filter comprises a second filtering branch, the second filtering branch is adjacent to the first filtering branch, and the second filtering branch and the first filtering branch are divided into eight rows which are sequentially arranged along the second direction. The first filtering branch and the second filtering branch are arranged adjacently, so that the arrangement of the filtering cavities is tight; the second filtering branch and the first filtering branch are regularly distributed in eight rows, so that the size of the filter can be reduced.

The second filtering cavities of the second filtering branch are in a row; the first filtering cavities of the first filtering branch circuit, the first filtering cavities of the second filtering branch circuit and the third filtering cavities of the second filtering branch circuit are in a row and are sequentially arranged along a first direction; the second filtering cavity and the third filtering cavity of the first filtering branch circuit and the fourth filtering cavity of the second filtering branch circuit are in a row and are sequentially arranged along a first direction; the fifth filtering cavities and the fourth filtering cavities of the first filtering branch circuit and the fifth filtering cavities of the second filtering branch circuit are in a row and are sequentially arranged along a first direction; the sixth filtering cavity and the seventh filtering cavity of the first filtering branch circuit and the sixth filtering cavity of the second filtering branch circuit are in a row and are sequentially arranged along the first direction; the eighth filtering cavity of the first filtering branch, the eighth filtering cavity of the second filtering branch and the seventh filtering cavity are in a row and are sequentially arranged along a first direction; the tenth filtering cavity and the ninth filtering cavity of the first filtering branch and the ninth filtering cavity of the second filtering branch are in a row and are sequentially arranged along the first direction; the eleventh filter cavity of the first filter branch, the tenth filter cavity of the second filter branch and the eleventh filter cavity are in a row and are sequentially arranged along the first direction. The second filtering branch and the first filtering branch are regularly distributed in eight rows, so that the arrangement rule of the filters is compact, the size of the filters is reduced, and the production cost is reduced.

The second filter cavity of the second filter branch circuit is adjacent to the third filter cavity of the second filter branch circuit; the first filter cavity of the second filter branch is respectively adjacent to the first filter cavity and the third filter cavity of the first filter branch and the third filter cavity of the second filter branch; the fourth filter cavity of the first filter branch is respectively adjacent to the third filter cavity, the fifth filter cavity, the seventh filter cavity and the fifth filter cavity of the first filter branch; the eighth filtering cavity of the second filtering branch is respectively adjacent to the seventh filtering cavity, the eighth filtering cavity, the ninth filtering cavity and the seventh filtering cavity of the first filtering branch; and the ninth filtering cavity of the first filtering branch is respectively adjacent to the tenth filtering cavity of the first filtering branch, the eighth filtering cavity of the second filtering branch, the ninth filtering cavity and the tenth filtering cavity. A plurality of filtering chambers are adjacently arranged, so that the filter is arranged regularly and tightly, the size of the filter is reduced, and the production cost is reduced.

And the first filtering cavity and the third filtering cavity of the second filtering branch are in capacitive cross coupling to form four cross coupling zeros of the second filtering branch. The four cross-coupling zeros of the second filtering branch can achieve the zero suppression effect, and the out-of-band suppression performance of the filter is improved.

The bandwidth range of the first filtering branch is as follows: 2514) 2676 MHz; the bandwidth range of the second filtering branch is as follows: 2514 and 2676 MHz.

In order to solve the technical problem, the application adopts a technical scheme that: there is provided a communication device comprising an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter as described above for filtering a radio frequency signal.

The beneficial effect of this application is: different from the prior art, the first filtering branch forms four cross-coupling zeros, so that the zero suppression effect can be realized; the first filtering branches are regularly distributed in seven rows, the size of the filter is reduced, a plurality of filters can be produced by using the same die, and the production cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first embodiment of a filter provided in the present application;

fig. 2 is a schematic diagram of a topology of a first filtering branch provided in the present application;

FIG. 3 is a schematic diagram of a second embodiment of a filter provided herein;

fig. 4 is a schematic diagram of a topology of a second filtering branch provided in the present application;

fig. 5 is a diagram of simulation results of a first filtering branch provided in the present application;

fig. 6 is a schematic structural diagram of an embodiment of a communication device provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a filter according to a first embodiment of the present disclosure. The filter 1 comprises a housing 10 and a first filter branch 20.

The housing 10 has a first direction i and a second direction ii, and the first direction i of the housing 10 and the second direction ii of the housing 10 are arranged perpendicularly.

The first filtering branch 20 is disposed on the housing 10 and is composed of eleven filtering cavities 21 coupled in sequence, and the eleven filtering cavities 21 further form four cross-coupling zeros 22, as shown in fig. 1, which can implement zero suppression and facilitate debugging. The eleven filter cavities 21 of the first filter branch 20 are specifically the first filter cavity a1 through the eleventh filter cavity a11 of the first filter branch 20.

As shown in fig. 1, the eleven filter cavities 21 of the first filter branch 20 are divided into seven rows arranged in the second direction ii of the housing 10.

Specifically, the first filter chamber a1 is in one row; the second filter cavity A2 and the third filter cavity A3 are in a row and are sequentially arranged along the first direction I of the shell 10; the fifth filter cavity A5 and the fourth filter cavity A4 are in a row and are sequentially arranged along the first direction I of the shell 10; the sixth filter cavity A6 and the seventh filter cavity A7 are in a row and are sequentially arranged along the first direction I of the shell 10; the eighth filter cavities A8 are in one row; the tenth filter cavity a10 and the ninth filter cavity a9 are in a row and are sequentially arranged along the first direction i of the housing 10; the eleventh filter chamber a11 is in one row.

The second filter cavity a2 is respectively adjacent to the first filter cavity a1, the third filter cavity A3 and the fifth filter cavity a 5; the fourth filter cavity A4 is respectively arranged adjacent to the third filter cavity A3, the fifth filter cavity A5 and the seventh filter cavity A7; the sixth filter cavity A6 is respectively adjacent to the fifth filter cavity A5, the seventh filter cavity A7 and the eighth filter cavity A8; the tenth filter chamber a10 is disposed adjacent to the eighth filter chamber A8, the ninth filter chamber a9, and the eleventh filter chamber a11, respectively.

Eleven filter cavities 21 of the first filter branch 20 are regularly distributed in seven rows, so that the size of the filter 1 can be reduced. Meanwhile, a plurality of filters 1 can be produced by using the same die, index parameters of the filters 1 are flexibly adjusted, and intermodulation of zero points is improved.

Referring to fig. 1 and fig. 2, fig. 2 is a schematic diagram of a topology of a first filtering branch circuit according to the present application. Inductive cross coupling is performed between the second filter cavity a2 and the fifth filter cavity a5 of the first filter branch 20, between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 20, between the sixth filter cavity a6 and the eighth filter cavity A8 of the first filter branch 20, and capacitive cross coupling is performed between the ninth filter cavity a9 and the eleventh filter cavity a11 of the first filter branch 20, respectively, so as to form four cross-coupling zeros 22 of the first filter branch 20.

Specifically, a window may be disposed between the second filter cavity a2 and the fifth filter cavity a5, and a metal coupling rib is disposed on the window, so that the second filter cavity a2 and the fifth filter cavity a5 realize inductive cross coupling, and form a cross coupling zero 22 of the first filter branch 20, which is equivalent to the inductance L1 described in fig. 2. A window may be disposed between the third filter cavity A3 and the fifth filter cavity a5, and a metal coupling rib is disposed on the window, so that the third filter cavity A3 and the fifth filter cavity a5 realize inductive cross coupling, and a cross coupling zero 22 of the first filter branch 20 is formed, which is equivalent to the inductor L2 described in fig. 2. A window may be disposed between the sixth filter cavity a6 and the eighth filter cavity A8, and a metal coupling rib is disposed on the window, so that the sixth filter cavity a6 and the eighth filter cavity A8 realize inductive cross coupling, and a cross coupling zero 22 of the first filter branch 20 is formed, which is equivalent to the inductor L3 described in fig. 2. Because the metal coupling rib is slightly influenced by the change of the external temperature, the temperature drift of the filter 1 is avoided.

A window may be disposed between the ninth filter cavity a9 and the eleventh filter cavity a11, and a flying bar is disposed at the window, so that the ninth filter cavity a9 and the eleventh filter cavity a11 realize capacitive cross coupling, and form a cross coupling zero 22 of the first filter branch 20, which is equivalent to the capacitor C1 illustrated in fig. 2.

In this embodiment, the first filtering cavity a1, the second filtering cavity a2, the third filtering cavity A3, the fourth filtering cavity a4, the fifth filtering cavity a5, the sixth filtering cavity a6, the seventh filtering cavity a7, the eighth filtering cavity A8, the ninth filtering cavity a9, the tenth filtering cavity a10 and the eleventh filtering cavity a11 of the first filtering branch 20 may have the same size, that is, the eleven filtering cavities 21 of the first filtering branch 20 may be distributed equidistantly, so that the layout and the debugging are facilitated, and the consistency of the filter 1 is improved. Optionally, the eleven filter cavities 21 of the first filter branch 20 may be distributed at equal intervals, and metal coupling ribs of the same specification may be adopted to form three inductive cross-coupling zeros 22, so as to reduce the types of materials, facilitate manufacturing, reduce the complexity of the filter 1, and save cost.

Optionally, the housing 10 is further provided with a first port (not shown) and a second port (not shown), the first filter cavity a1 of the first filter branch 20 is connected with the first port, and the eleventh filter cavity a11 of the first filter branch 20 is connected with the second port. Both the first port and the second port can be taps of the filter 1 and are connected with an external connector.

Referring further to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of the filter provided in the present application. On the basis of the above embodiment, the filter 1 further comprises a second filtering branch 30.

The second filtering branch 30 is disposed on the housing 10 and is composed of eleven filtering cavities 31 coupled in sequence, and the eleven filtering cavities 31 further form four cross-coupling zeros 32, as shown in fig. 3, which can implement zero suppression and facilitate debugging. The second filter branch 30 is disposed adjacent to the first filter branch 20. The eleven filter cavities 31 of the second filter branch 30 are specifically the first filter cavity B1 through the eleventh filter cavity B11 of the second filter branch 30.

As shown in fig. 3, the eleven filter cavities 31 of the second filter branch 30 and the eleven filter cavities 21 of the first filter branch 20 are divided into eight rows arranged in the second direction ii of the housing 10.

Specifically, the second filter cavities B2 of the second filter branch 30 are in one row; the first filtering cavity a1 of the first filtering branch 20, the first filtering cavity B1 of the second filtering branch 30 and the third filtering cavity B3 are in a row and are sequentially arranged along the first direction i of the housing 10; the second filtering cavity a2, the third filtering cavity A3 and the fourth filtering cavity B4 of the first filtering branch 20 and the second filtering branch 30 are in a row and are sequentially arranged along the first direction i of the housing 10; the fifth filter cavity a5 and the fourth filter cavity a4 of the first filter branch 20 and the fifth filter cavity B5 of the second filter branch 30 are in a row and are sequentially arranged along the first direction i of the housing 10; the sixth filtering cavity a6 and the seventh filtering cavity a7 of the first filtering branch 20 and the sixth filtering cavity B6 of the second filtering branch 30 are in a row and are sequentially arranged along the first direction i of the housing 10; the eighth filtering cavity A8 of the first filtering branch 20, the eighth filtering cavity B8 of the second filtering branch 30 and the seventh filtering cavity B7 are in a row and are sequentially arranged along the first direction i of the housing 10; the tenth filtering cavity a10 and the ninth filtering cavity a9 of the first filtering branch 20 and the ninth filtering cavity B9 of the second filtering branch 30 are in a row and are sequentially arranged along the first direction i of the housing 10; the eleventh filter cavity a11 of the first filter branch 20, the tenth filter cavity B10 of the second filter branch 30 and the eleventh filter cavity B11 are in a row and are sequentially arranged along the first direction i of the housing 10.

The second filter cavity B2 of the second filter branch 30 is adjacent to the third filter cavity B3 of the second filter branch 30; the first filter cavity B1 of the second filter branch 30 is respectively adjacent to the first filter cavity a1 and the third filter cavity A3 of the first filter branch 20, and the third filter cavity B3 of the second filter branch 30; the fourth filtering cavity a4 of the first filtering branch 20 is respectively adjacent to the third filtering cavity A3, the fifth filtering cavity a5, the seventh filtering cavity a7 and the fifth filtering cavity B5 of the first filtering branch 20; the eighth filtering cavity B8 of the second filtering branch 30 is respectively adjacent to the seventh filtering cavity a7, the eighth filtering cavity a8, the ninth filtering cavity a9 of the first filtering branch 20, and the seventh filtering cavity B7 of the second filtering branch 30; the ninth filtering cavity a9 of the first filtering branch 20 is respectively adjacent to the tenth filtering cavity a10 of the first filtering branch 20, the eighth filtering cavity B8 of the second filtering branch 30, the ninth filtering cavity B9 and the tenth filtering cavity B10.

Eleven filter cavities 31 of the second filter branch 30 and eleven filter cavities 21 of the first filter branch 20 are regularly distributed in seven rows, so that the size of the filter 1 can be reduced.

Referring to fig. 3 and 4, fig. 4 is a schematic diagram of a topology of a second filtering branch according to the present application. Inductive cross coupling is respectively performed between the first filtering cavity B1 and the fourth filtering cavity B4 of the second filtering branch 30, between the sixth filtering cavity B6 and the eighth filtering cavity B8 of the second filtering branch 30, between the ninth filtering cavity B9 and the eleventh filtering cavity B11 of the second filtering branch 30, and capacitive cross coupling is performed between the first filtering cavity B1 and the third filtering cavity B3 of the second filtering branch 30, so as to form four cross coupling zeros 32 of the second filtering branch 30.

Specifically, a window may be disposed between the first filter cavity B1 and the fourth filter cavity B4, and a metal coupling rib is disposed on the window, so that the first filter cavity B1 and the fourth filter cavity B4 realize inductive cross coupling, and form a cross coupling zero point 32 of the second filter branch 30, which is equivalent to the inductance L4 described in fig. 4. A window may be disposed between the sixth filter cavity B6 and the eighth filter cavity B8, and a metal coupling rib is disposed on the window, so that the sixth filter cavity B6 and the eighth filter cavity B8 realize inductive cross coupling, and a cross coupling zero 32 of the second filter branch 30 is formed, which is equivalent to the inductor L5 described in fig. 4. A window may be disposed between the ninth filter cavity B9 and the eleventh filter cavity B11, and a metal coupling rib is disposed on the window, so that the ninth filter cavity B9 and the eleventh filter cavity B11 realize inductive cross coupling, and a cross coupling zero 32 of the second filter branch 30 is formed, which is equivalent to the inductor L6 shown in fig. 4. Because the metal coupling rib is slightly influenced by the change of the external temperature, the temperature drift of the filter 1 is avoided.

A window may be disposed between the first filter cavity B1 and the third filter cavity B3, and a flying bar is disposed at the window, so that the first filter cavity B1 and the third filter cavity B3 realize capacitive cross coupling, and a cross coupling zero 32 of the second filter branch 30 is formed, which is equivalent to the capacitor C2 shown in fig. 4.

In this embodiment, the sizes of the first filter cavity B1, the second filter cavity B2, the third filter cavity B3, the fourth filter cavity B4, the fifth filter cavity B5, the sixth filter cavity B6, the seventh filter cavity B7, the eighth filter cavity B8, the ninth filter cavity B9, the tenth filter cavity B10 and the eleventh filter cavity B11 of the second filter branch 30, and the sizes of the first filter cavity a1, the second filter cavity a2, the third filter cavity A3, the fourth filter cavity a4, the fifth filter cavity A5, the sixth filter cavity A6, the seventh filter cavity a7, the eighth filter cavity a8, the ninth filter cavity a9, the tenth filter cavity a10 and the eleventh filter cavity a11 of the first filter branch 30 may be the same size, that the eleven filter cavities 30 and the eleventh filter cavities a11 may be distributed at the same distance, so that the sizes of the eleventh filter cavities 30 and the eleventh filter cavities 20 may be adjusted and the distribution of the eleventh filter cavities may be uniform.

Optionally, eleven filter cavities 31 of the second filter branch 30 may be distributed at equal intervals, and metal coupling ribs of the same specification may be adopted to form three inductive cross-coupling zeros 32, so as to reduce the types of materials, facilitate manufacturing, reduce the complexity of the filter 1, and save cost.

Optionally, a third port (not shown) and a fourth port (not shown) are further disposed on the housing 10, the first filter cavity B1 of the second filter branch 30 is connected to the third port, and the eleventh filter cavity B11 of the second filter branch 30 is connected to the fourth port. Wherein, the third port and the fourth port can be taps of the filter 1 and are connected with an external connector.

The bandwidth of the first filtering branch 20 of the present embodiment is in the range of 2514Mhz-2676 Mhz. Specifically, the coupling bandwidth between the first port and the first filter cavity A1 ranges from 158Mhz to 180 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 ranges from 123Mhz-141 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 78Mhz to 91 Mhz; the coupling bandwidth between the second filter cavity a2 and the fifth filter cavity a5 ranges from 26Mhz to 34 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 ranges from 24Mhz to 31 Mhz; the coupling bandwidth between the third filter cavity A3 and the fifth filter cavity a5 ranges from (-71) Mhz- (-60) Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 33Mhz to 41 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 ranges from 73Mhz to 86 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 ranges from 60Mhz to 71 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the eighth filter cavity A8 ranges from 41Mhz to 50 Mhz; the coupling bandwidth between the seventh filter cavity a7 and the eighth filter cavity A8 ranges from 60Mhz to 71 Mhz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 76Mhz to 89 Mhz; the coupling bandwidth between the ninth filter cavity a9 and the tenth filter cavity a10 ranges from 66Mhz to 78 Mhz; the coupling bandwidth between the ninth filter cavity a9 and the eleventh filter cavity a11 ranges from 60Mhz to 71 Mhz; the coupling bandwidth between the tenth filter cavity a10 and the eleventh filter cavity a11 ranges from 106Mhz to 122 Mhz; the coupling bandwidth between the eleventh filter cavity a11 and the second port ranges from 158Mhz to 180 Mhz; can meet the design requirements.

Therefore, the resonant frequencies of the first filter cavity a1 through the eleventh filter cavity a11 of the first filter branch 20 are sequentially located in the following ranges: 2592Mhz-2594Mhz, 2567Mhz-2569Mhz, 2521Mhz-2523Mhz, 2594Mhz-2596Mhz, 2592Mhz-2594Mhz, 2640Mhz-2642Mhz, 2590Mhz-2592Mhz, 2586Mhz-2588Mhz, 2640Mhz-2642Mhz, and 2592Mhz-2594 Mhz. Therefore, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 5, fig. 5 is a schematic diagram of simulation results of the first filtering branch circuit provided in the present application, and experimental tests show that the bandwidth of the first filtering branch circuit 20 of the present application is in the range of 2514Mhz-2676Mhz, as shown by the frequency band curve 50 in fig. 5. The first filtering branch 20 of the present application has a bandwidth rejection greater than or equal to 75dB at 2300Mhz-2402Mhz, a bandwidth rejection greater than or equal to 55dB at 2400Mhz-2457Mhz, a bandwidth rejection greater than or equal to 50dB at 2455Mhz-2485.5Mhz, a bandwidth rejection greater than or equal to 52dB at 2483.5Mhz-2502Mhz, a bandwidth rejection greater than or equal to 55dB at 2698Mhz-2720Mhz, a bandwidth rejection greater than or equal to 60dB at 2718Mhz-2900Mhz, a bandwidth rejection greater than or equal to 65dB at 2898Mhz-3400Mhz, and a bandwidth rejection greater than or equal to 90dB at 3398Mhz-3800Mhz, so that the out-of-band rejection performance of the filter 1 can be improved. Wherein, a cross coupling zero point D of the first filtering branch 20 is located in the range of 2480Mhz-2500Mhz, the suppression is greater than 80dB, and the parameter design requirement of the filter 1 is met.

The coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved.

It should be noted that the parameters (e.g., frequency point and suppression) of two or more coupling zeros of the present application may be the same; in the simulation diagram, the coupling zeros of the same parameters are shown as the same coupling zeros.

The bandwidth of the second filtering branch 30 of the present embodiment is in the range of 2514Mhz-2676 Mhz. Specifically, the coupling bandwidth between the third port and the first filter cavity B1 ranges from 161Mhz to 184 Mhz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 52Mhz to 62 Mhz; the coupling bandwidth between the first filter cavity B1 and the third filter cavity B3 ranges from (-117) Mhz- (-101) Mhz; the coupling bandwidth between the first filter cavity B1 and the fourth filter cavity B4 ranges from 48Mhz to 58 Mhz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 ranges from 13Mhz to 19 Mhz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 ranges from 73Mhz to 86 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 78Mhz to 91 Mhz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 ranges from 76Mhz to 89 Mhz; the coupling bandwidth between the sixth filter cavity B6 and the seventh filter cavity B7 ranges from 61Mhz-73 Mhz; the coupling bandwidth between the sixth filter cavity B6 and the eighth filter cavity B8 ranges from 42Mhz to 51 Mhz; the coupling bandwidth between the seventh filter cavity B7 and the eighth filter cavity B8 ranges from 61Mhz-73 Mhz; the coupling bandwidth between the eighth filter cavity B8 and the ninth filter cavity B9 ranges from 78Mhz to 91 Mhz; the coupling bandwidth between the ninth filter cavity B9 and the tenth filter cavity B10 ranges from 69Mhz-81 Mhz; the coupling bandwidth between the ninth filter cavity B9 and the eleventh filter cavity B11 ranges from 61Mhz to 72 Mhz; the coupling bandwidth between the tenth filter cavity B10 and the eleventh filter cavity B11 ranges from 108Mhz to 125 Mhz; the coupling bandwidth between the eleventh filter cavity B11 and the fourth port is in the range of 161Mhz-184Mhz, and the design requirements can be met.

Therefore, the resonant frequencies of the first filter cavity B1 through the eleventh filter cavity B11 of the second filter branch 30 are sequentially located in the following ranges: 2592Mhz-2594Mhz, 2514Mhz-2516Mhz, 2563Mhz-2565Mhz, 2599Mhz-2601Mhz, 2594Mhz-2596Mhz, 2592Mhz-2594Mhz, 2641Mhz-2643Mhz, 2590Mhz-2592Mhz, 2585Mhz-2587Mhz, 2640Mhz-2642Mhz and 2592Mhz-2594 Mhz. Therefore, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

The simulation result diagram of the second filtering branch 30 is consistent with the simulation result diagram of the first filtering branch 20, as shown in fig. 5, and is not repeated herein.

The present application further provides a communication device, as shown in fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the communication device provided in the present application. The communication device 60 includes an antenna 62 and a Radio Unit 61(Radio Remote Unit, RRU), and the Radio Unit 61 is connected to the antenna 62. The radio frequency unit 61 comprises a filter 1 as shown in the above embodiments, the filter 1 being used for filtering the radio frequency signal. In other embodiments, the rf Unit 61 may be integrally designed with the Antenna 62 to form an Active Antenna Unit (AAU).

Some embodiments of the present application are referred to as filters and may also be referred to as combiners, i.e., dual-frequency combiners.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. A filter, characterized in that the filter comprises:

a housing having a first direction and a second direction perpendicular to the first direction;

the first filtering branch is arranged on the shell and consists of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the first filtering branch form four cross-coupling zeros;

eleven filter cavities of the first filter branch circuit are divided into seven rows which are sequentially arranged along the second direction.

2. The filter of claim 1,

the first filtering cavities of the first filtering branch are in a row;

the second filtering cavities and the third filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction;

the fifth filtering cavities and the fourth filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction;

the sixth filtering cavities and the seventh filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction;

the eighth filtering cavities of the first filtering branch are in a row;

the tenth filtering cavity and the ninth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction;

and the eleventh filtering cavities of the first filtering branch are in one row.

3. The filter of claim 2,

the second filter cavity of the first filter branch is respectively adjacent to the first filter cavity, the third filter cavity and the fifth filter cavity;

the fourth filter cavity of the first filter branch is respectively adjacent to the third filter cavity, the fifth filter cavity and the seventh filter cavity;

the sixth filtering cavity of the first filtering branch is respectively adjacent to the fifth filtering cavity, the seventh filtering cavity and the eighth filtering cavity;

and the tenth filtering cavity of the first filtering branch is respectively adjacent to the eighth filtering cavity, the ninth filtering cavity and the eleventh filtering cavity.

4. The filter of claim 3,

and the second filtering cavity and the fifth filtering cavity of the first filtering branch, the third filtering cavity and the fifth filtering cavity and the sixth filtering cavity and the eighth filtering cavity of the first filtering branch are in inductive cross coupling respectively, and the ninth filtering cavity and the eleventh filtering cavity of the first filtering branch are in capacitive cross coupling to form four cross coupling zeros of the first filtering branch.

5. The filter according to claim 4, wherein the filter comprises a second filtering branch, the second filtering branch is disposed adjacent to the first filtering branch, and the second filtering branch and the first filtering branch are divided into eight columns sequentially arranged along the second direction.

6. The filter of claim 5,

the second filtering cavities of the second filtering branch are in a row;

the first filtering cavities of the first filtering branch circuit, the first filtering cavities of the second filtering branch circuit and the third filtering cavities are in a row and are sequentially arranged along the first direction;

the second filtering cavity and the third filtering cavity of the first filtering branch circuit and the fourth filtering cavity of the second filtering branch circuit are in a row and are sequentially arranged along the first direction;

the fifth filtering cavities and the fourth filtering cavities of the first filtering branch and the fifth filtering cavities of the second filtering branch are in a row and are sequentially arranged along the first direction;

the sixth filtering cavity and the seventh filtering cavity of the first filtering branch and the sixth filtering cavity of the second filtering branch are in a row and are sequentially arranged along the first direction;

the eighth filtering cavity of the first filtering branch, the eighth filtering cavity of the second filtering branch and the seventh filtering cavity of the second filtering branch are in a row and are sequentially arranged along the first direction;

the tenth filtering cavity and the ninth filtering cavity of the first filtering branch and the ninth filtering cavity of the second filtering branch are in a row and are sequentially arranged along the first direction;

the eleventh filtering cavity of the first filtering branch, the tenth filtering cavity of the second filtering branch and the eleventh filtering cavity are in a row and are sequentially arranged along the first direction.

7. The filter of claim 6,

a second filter cavity of the second filter branch is adjacent to a third filter cavity of the second filter branch;

the first filter cavity of the second filter branch is respectively adjacent to the first filter cavity and the third filter cavity of the first filter branch and the third filter cavity of the second filter branch;

the fourth filter cavity of the first filter branch is respectively adjacent to the third filter cavity, the fifth filter cavity, the seventh filter cavity and the fifth filter cavity of the first filter branch;

the eighth filtering cavity of the second filtering branch is respectively adjacent to the seventh filtering cavity, the eighth filtering cavity, the ninth filtering cavity of the first filtering branch and the seventh filtering cavity of the second filtering branch;

and the ninth filtering cavity of the first filtering branch circuit is respectively adjacent to the tenth filtering cavity of the first filtering branch circuit, the eighth filtering cavity of the second filtering branch circuit, the ninth filtering cavity and the tenth filtering cavity.

8. The filter according to claim 7, wherein the first filter cavity and the fourth filter cavity, the sixth filter cavity and the eighth filter cavity, and the ninth filter cavity and the eleventh filter cavity of the second filter branch are inductively cross-coupled, and the first filter cavity and the third filter cavity of the second filter branch are capacitively cross-coupled to form four cross-coupling zeros of the second filter branch.

9. The filter of claim 8,

the bandwidth range of the first filtering branch is as follows: 2514) 2676 MHz;

the bandwidth range of the second filtering branch is as follows: 2514 and 2676 MHz.

10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of claims 1-9 for filtering radio frequency signals.