CN111129667B - Negative coupling structure applied to dielectric waveguide filter and dielectric waveguide filter - Google Patents
Negative coupling structure applied to dielectric waveguide filter and dielectric waveguide filter Download PDFInfo
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- CN111129667B CN111129667B CN201911167507.5A CN201911167507A CN111129667B CN 111129667 B CN111129667 B CN 111129667B CN 201911167507 A CN201911167507 A CN 201911167507A CN 111129667 B CN111129667 B CN 111129667B
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- 238000005859 coupling reaction Methods 0.000 title claims abstract description 170
- 238000000034 method Methods 0.000 abstract description 3
- 239000011449 brick Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000003071 parasitic effect Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 238000006880 cross-coupling reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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Abstract
The invention discloses a negative coupling structure applied to a dielectric waveguide filter, which comprises two dielectric resonators, wherein a coupling structure is arranged at the joint between the two dielectric resonators, and the coupling structure comprises: the square brick-shaped dielectric resonator comprises a coupling window, a small hole or a narrow slit, a first coupling groove and a second coupling groove, wherein the coupling window is arranged at the joint and connects two dielectric resonators, the small hole or the narrow slit is arranged at the center of the coupling window, the first coupling groove is arranged on the upper surface or the lower surface of one square brick-shaped dielectric resonator, the second coupling groove is arranged on the lower surface or the upper surface of the other square brick-shaped dielectric resonator, and the first coupling groove and the second coupling groove are communicated through the small hole or the narrow slit at the center of the coupling window. The invention also discloses a dielectric waveguide filter with the negative coupling structure. The invention has the following characteristics: 1) the coupling amount can be large or small, weak negative coupling can be realized, and the method is suitable for application scenes with small coupling amount. 2) No spurious harmonic is generated at the lower frequency band of the filter passband.
Description
Technical Field
The invention relates to the technical field of communication equipment components, in particular to a negative coupling structure (capacitive coupling) applied to the design of a dielectric filter.
Background
With the development of mobile communication technology, miniaturization and integration are becoming development trends of communication equipment, wherein a dielectric waveguide filter is based on dielectric resonators, and the filtering performance is realized through coupling between the resonators, which has the advantages of small volume, low insertion loss, low cost, easy integration and the like compared with a transmission metal cavity filter, and in order to realize more and more strict performance requirements, such as steep transition band and low insertion loss, negative coupling between the resonators is generally required. At present, a negative coupling mode between dielectric waveguide resonators is mainly realized by arranging blind holes between the resonators, for example, an existing dielectric waveguide filter is shown in fig. 1, the dielectric waveguide filter comprises at least one negative coupling blind hole 3 on a dielectric resonator, the negative coupling blind hole 3 is positioned on the surface of a body at the connecting position of the dielectric resonator 1 and the dielectric resonator 2, and the depth of the negative coupling blind hole 3 is at least two times of the depth of a tuning hole 4 of the dielectric resonator 1, so that the bottom of the negative coupling blind hole is very close to the bottom surface of the resonator, and a strong and pessimistic effect is formed to realize negative coupling. But also because the depth of the negative coupling blind hole is deeper, the hole body forms an inductance effect, the hole bottom forms an inductance effect, and the hole bottom forms a capacitance effect, therefore, a resonance effect similar to a series resonance circuit is formed, a resonance peak is formed on a filter curve of the filter, so that the suppression performance of the filter cannot meet the requirement of a specific frequency band, generally, the position of the resonance peak on a frequency domain is determined by the depth of a negative coupling blind hole, the deeper the depth, the lower the frequency, and vice versa, the depth of the negative coupling blind hole is determined according to the coupling amount designed by the customer index, namely once the customer index is determined, the depth of the negative coupling blind hole is determined, and the position of a resonance peak caused by the negative coupling blind hole on a frequency domain cannot be adjusted, so that the negative coupling structure cannot meet the performance requirement of the filter when the resonance peak falls in a frequency band with higher suppression requirement. In addition, because the axial cross section of the negative coupling blind hole is small, and the connection area between the resonators is large, other dielectric resonators can easily generate parasitic coupling through the connection area, so that the frequency characteristic of the dielectric filter with a symmetrical structure is high on one side and low on the other side, and the required symmetrical characteristic cannot be obtained.
To this end, chinese patent application publication No. CN110444849A discloses a negative coupling structure of dielectric resonator and a dielectric waveguide filter using the same, which can effectively solve the problem of negative coupling and avoid the influence of resonance peaks, and reduce parasitic coupling, have more symmetrical frequency response characteristics, see figure 2, the dielectric resonator comprises at least two dielectric resonators 1a and 2a which are connected, wherein the centers of the surfaces of the dielectric resonators 1a and 2a are respectively provided with a resonance blind hole 7a, a coupling structure is arranged at the joint 5a between the dielectric resonators 1a and 2a, the coupling structure comprises a long blind groove 6a, the blind groove 6a is arranged at the joint 5a between the dielectric resonators 1a and 2a, the length of the blind groove 6a is 40% -100% of the length of the joint 5a between the dielectric resonators 1a and 2a, and the depth of the blind groove 6a is 50% -95% of the height of the joint between the dielectric resonators.
However, this patent has the following problems:
1) the coupling amount is larger, and the horizontal seam is too small and fragile in small coupling.
2) The lower end is provided with thorns.
Disclosure of Invention
One of the technical problems to be solved by the present invention is to provide a negative coupling (capacitive coupling) structure applied in a dielectric waveguide filter to solve the above technical problems in the negative coupling structure of the existing dielectric resonator.
The second technical problem to be solved by the present invention is to provide a dielectric waveguide filter having the above-mentioned negative coupling (capacitive coupling) structure.
As a first aspect of the present invention, a negative coupling (capacitive coupling) structure applied to a dielectric waveguide filter includes two dielectric resonators or dielectric resonators, a blind hole is disposed at a central portion on an upper surface or/and a lower surface of each dielectric resonator or dielectric resonator, and a coupling structure is disposed at a connection between adjacent edges of the two dielectric resonators or dielectric resonators, where the coupling structure includes:
a coupling window disposed at the junction and connecting the adjacent sides of the two dielectric resonators or dielectric resonators, and
a small hole or narrow slit provided at a central portion of the coupling window, an
The first coupling groove is arranged on the upper surface or the lower surface of one square brick-shaped dielectric resonator or dielectric resonant cavity, and the second coupling groove is arranged on the lower surface or the upper surface of the other square brick-shaped dielectric resonator or dielectric resonant cavity, and the first coupling groove and the second coupling groove are communicated through a small hole or a narrow slit in the center of the coupling window.
In a preferred embodiment of the invention, the coupling window is a rectangular sheet.
In a preferred embodiment of the present invention, the first coupling groove, the second coupling groove, and the small hole or narrow slit at the central portion of the coupling window are connected to form a "Z" shape as a whole.
In a preferred embodiment of the present invention, the first coupling groove and the second coupling groove are respectively communicated with the corresponding blind holes.
In a preferred embodiment of the present invention, the smaller the ghost area of the first coupling groove and the second coupling groove, the greater the coupling. The coupling structure is easy to realize weak negative coupling and is a preferred scheme of cross negative coupling.
In a preferred embodiment of the present invention, the first coupling groove and the second coupling groove are far away from each other (no ghost image) when a large amount of coupling is required. The center of the coupling window is connected with the small holes or narrow slits of the first coupling groove and the second coupling groove in an inclined arrangement.
In a preferred embodiment of the invention, the blind holes are metallized blind holes for frequency adjustment and high-order mode control.
In a preferred embodiment of the invention, the two dielectric resonators or dielectric resonators and the coupling structure outer surface are all metallized.
The dielectric waveguide filter as the second aspect of the present invention includes the above-described negative coupling (capacitive coupling) structure.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following characteristics:
1) the weak negative coupling can be realized, and the method is suitable for application scenes with small coupling amount.
2) Stronger negative coupling (connecting the two coupling grooves by using the inclined hole) can be realized, and the method is suitable for application scenes with medium coupling amount (the parasitic coupling is opposite to small coupling scenes).
3) No spurious harmonic is generated at the lower frequency band of the filter passband.
4) The invention has irreplaceable advantages in most cases, or in exchange for other costs, except for a somewhat complex implementation.
Drawings
Fig. 1 is a schematic perspective view of a conventional dielectric resonator.
Fig. 2 is a schematic perspective view of CN110444849A disclosing a negative coupling structure of a dielectric resonator.
Fig. 3 is a schematic structural view of a negative coupling (capacitive coupling) structure applied to a dielectric waveguide filter of the present invention, as viewed from one direction.
Fig. 4 is a schematic diagram of a negative coupling (capacitive coupling) structure applied to a dielectric waveguide filter of the present invention viewed from another direction.
Fig. 5 is a graph of the pass band frequency response of a dielectric waveguide filter for cross-coupling applications with the negative coupling (capacitive coupling) structure of the present invention. Fig. 6 is its broadband response curve.
Fig. 7 is a graph of the pass band frequency response of a dielectric waveguide filter for a negative coupling (capacitive coupling) configuration of the present invention as a primary coupling application.
Detailed Description
The invention is further described below in conjunction with the appended drawings and detailed description.
Referring to fig. 3 and 4, the negative coupling (capacitive coupling) structure applied to the dielectric waveguide filter shown in the figures is composed of two dielectric resonators 10 and 20 or dielectric resonators in the shape of square bricks on the left and right, and the dielectric resonators 10 and 20 are made of ceramic dielectric materials or polymer dielectric materials. In addition, the dielectric resonators 10, 20hi may be circular or polygonal blocks other than the square brick shape.
A metallized blind hole 11, 21 is respectively arranged on the upper surface or the lower surface or the central parts of the upper surface and the lower surface of the dielectric resonator 10, 20 for frequency adjustment and high-order touch control. In the present embodiment, a blind metallized via 11 is provided at the center of the upper surface 12 of the dielectric resonator 10, and a blind metallized via 21 is provided at the center of the upper surface 22 of the dielectric resonator 10.
A coupling structure is provided at the junction between two dielectric resonators 10, 20 in the shape of a square brick or adjacent sides of a dielectric resonator, the coupling structure comprising:
and a coupling window 30 disposed at the junction and connecting the two dielectric resonators 10, 20 in the shape of a square brick or adjacent sides of the dielectric resonator, the coupling window 30 being a rectangular thin plate.
A small hole 31 or slot provided in the center of the coupling window 30.
A first coupling groove 13 provided on the upper surface or the lower surface of one of the dielectric resonators 10 or the dielectric resonators, and a second coupling groove 23 provided on the lower surface or the upper surface of the other of the dielectric resonators 20 or the dielectric resonators. In the present embodiment, a first coupling groove 13 is provided on an upper surface 12 of a dielectric resonator 10 or a dielectric resonator in a square brick shape, and a second coupling groove 23 is provided on a lower surface 24 of a dielectric resonator 20 or a dielectric resonator in a square brick shape.
The first coupling groove 13 and the second coupling groove 23 are communicated through a small hole 31 or a narrow slit at the center of the coupling window 30. The whole body of the first coupling groove 13, the second coupling groove 23 and the small hole 31 or the narrow slit at the central part of the coupling window 30 is in a Z shape.
The two dielectric resonators 10, 20 in the form of square bricks or dielectric resonators and the outer surfaces of the coupling structure are all metallized.
The ghost area of the first coupling groove 13 and the second coupling groove 23 is 0-100%. The smaller the ghost area of the first coupling groove 13 and the second coupling groove 23 is, the larger the coupling is. The coupling structure is easy to realize weak negative coupling and is a preferred scheme of cross negative coupling.
The wider and deeper the first coupling groove 13 and the second coupling groove 23 are, the larger the coupling amount is, and the first coupling groove 13 and the blind metallized hole 11 can be communicated, or/and the second coupling groove 23 and the blind metallized hole 21 can be communicated, so that the coupling amount is increased.
If the coupling is to be further expanded, the distance between the first coupling groove 13 and the second coupling groove 23 can be increased, and the small hole 31 is changed into an inclined hole.
Referring to fig. 5 and 6, the negative coupling (capacitive coupling) structure of the present invention has no spurs at the lower end of the pass-band frequency response curve of the dielectric waveguide filter for cross-coupling application and no spurious harmonics generation in the frequency band below the pass-band of the filter.
Referring to fig. 7, the negative coupling (capacitive coupling) structure of the invention is used as a pass band frequency response curve of a dielectric waveguide filter applied to main coupling, no parasitic harmonic is generated in a frequency band below the pass band of the filter, the parasitic coupling and the corresponding symmetry are opposite to those of a small coupling case, and the negative coupling (capacitive coupling) structure can be selected preferentially according to index requirements.
Claims (7)
1. A negative coupling structure applied to a dielectric waveguide filter comprises two dielectric resonators or dielectric resonant cavities, a blind hole is arranged at the central part of the upper surface or/and the lower surface of each dielectric resonator or dielectric resonant cavity, a coupling structure is arranged at the joint between the adjacent edges of the two dielectric resonators or dielectric resonant cavities, and the coupling structure is characterized by comprising:
a coupling window disposed at the junction and connecting the adjacent sides of the two dielectric resonators or dielectric resonators, and
a small hole or narrow slit provided at a central portion of the coupling window, an
The first coupling groove is arranged on the upper surface or the lower surface of one square brick-shaped dielectric resonator or dielectric resonant cavity, and the second coupling groove is arranged on the lower surface or the upper surface of the other square brick-shaped dielectric resonator or dielectric resonant cavity, and the first coupling groove and the second coupling groove are communicated through a small hole or a narrow slit in the center of the coupling window;
the first coupling groove, the second coupling groove and the small hole or narrow slit at the central part of the coupling window are communicated with each other to form a Z shape; the small hole or the narrow slit at the center of the coupling window is arranged in an inclined shape.
2. The negative coupling structure as claimed in claim 1, wherein the coupling window is a rectangular sheet.
3. The negative coupling structure as claimed in claim 1, wherein the first coupling groove and the second coupling groove are respectively connected to the corresponding blind holes.
4. A negative coupling structure applied in a dielectric waveguide filter according to claim 3, wherein the ghost areas (small overlapping or non-overlapping) of the first coupling groove and the second coupling groove are smaller, and the coupling is larger.
5. The negative coupling structure as claimed in claim 1, wherein the blind via is a metallized blind via for frequency tuning and high-order mode control.
6. A negative coupling structure for use in a dielectric waveguide filter according to claim 1 wherein the two dielectric resonators or cavities and the coupling structure are all metallized on their outer surfaces.
7. A dielectric waveguide filter comprising a negative coupling structure according to any one of claims 1 to 6.
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| CN201911167507.5A CN111129667B (en) | 2019-11-25 | 2019-11-25 | Negative coupling structure applied to dielectric waveguide filter and dielectric waveguide filter |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111403872A (en) * | 2019-12-31 | 2020-07-10 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transceiver apparatus including the same |
| CN111244590B (en) * | 2019-12-31 | 2025-04-04 | 江苏灿勤科技股份有限公司 | Dielectric filters and radio transceiver equipment |
| CN113690560B (en) * | 2020-05-18 | 2023-06-09 | 大富科技(安徽)股份有限公司 | Dielectric filter, dielectric resonator and communication equipment |
| CN111740193A (en) * | 2020-06-23 | 2020-10-02 | 大富科技(安徽)股份有限公司 | Dielectric filter and communication base station |
| CN111834715A (en) * | 2020-06-23 | 2020-10-27 | 大富科技(安徽)股份有限公司 | Dielectric filter coupling structure, dielectric filter and communication base station |
| CN111799535A (en) * | 2020-07-06 | 2020-10-20 | 武汉凡谷陶瓷材料有限公司 | Capacitive coupling device and filter |
| CN111916880A (en) * | 2020-07-23 | 2020-11-10 | 华南理工大学 | A dual-mode dielectric waveguide filter |
| CN111900517A (en) * | 2020-07-28 | 2020-11-06 | 武汉凡谷陶瓷材料有限公司 | Capacitive coupling device and filter |
| CN112436253B (en) * | 2020-12-15 | 2025-04-15 | 人民华智通讯技术有限公司 | A dielectric waveguide filter |
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