CN114899563B - Combined band-pass filter - Google Patents
Combined band-pass filter Download PDFInfo
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- CN114899563B CN114899563B CN202210489908.8A CN202210489908A CN114899563B CN 114899563 B CN114899563 B CN 114899563B CN 202210489908 A CN202210489908 A CN 202210489908A CN 114899563 B CN114899563 B CN 114899563B
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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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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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 combined band-pass filter, which adopts two microwave low-loss dielectric ceramics to respectively prepare a ceramic waveguide filter module and a ceramic cavity filter module; the ceramic waveguide filter module and the ceramic cavity filter module are combined through silver brushing sintering; coupling windows are respectively arranged on opposite surfaces of the ceramic waveguide filtering module and the ceramic cavity filtering module; resonant cavities are respectively arranged on the ceramic waveguide filter module and the ceramic cavity filter module, the resonant cavities on the ceramic waveguide filter module and the ceramic cavity filter module form a CT structure through a coupling window, a transmission zero point is generated on the right side of a passband, and a relatively close parasitic zero point is arranged on the left side of the passband; this improves the rejection characteristics of the near end outside the passband of the filter.
Description
Technical Field
The present invention relates to a combined band-pass filter.
Background
A band-pass filter (band-pass filter) is a device that allows waves of a particular frequency band to pass while shielding other frequency bands. For example, the RLC tank is an analog bandpass filter. The band-pass filter has various forms, and the band-pass filter needs to have the characteristics of low insertion loss, high suppression, small volume and the like.
Disclosure of Invention
The invention aims to provide a combined band-pass filter, which adopts two microwave low-loss dielectric ceramics to respectively prepare a ceramic waveguide filter module and a ceramic cavity filter module; the ceramic waveguide filter module and the ceramic cavity filter module are combined through silver brushing sintering; coupling windows are respectively arranged on opposite surfaces of the ceramic waveguide filtering module and the ceramic cavity filtering module; resonant cavities are respectively arranged on the ceramic waveguide filter module and the ceramic cavity filter module, the resonant cavities on the ceramic waveguide filter module and the ceramic cavity filter module form a CT structure through a coupling window, a transmission zero point (the zero point is tunable) is generated on the right side (high frequency) of a passband, and a relatively near parasitic zero point is arranged on the left side (bottom frequency) of the passband; this improves the rejection characteristics of the near end outside the passband of the filter.
Preferably, both microwave low-loss dielectric ceramics are high dielectric constant ceramic materials.
Preferably, a resonance frequency adjusting silver layer for adjusting the resonance frequency of the resonance cavity (the resonance cavity on the ceramic cavity filter module) is provided on the ceramic cavity filter module.
Preferably, two resonant cavities are arranged on the ceramic cavity filter module, and each resonant cavity is provided with a resonant frequency adjusting silver layer.
Preferably, a coupling silver layer for coupling the two resonant cavities (the two resonant cavities on the ceramic cavity filter module) is disposed on the ceramic cavity filter module.
Preferably, a silver layer is coated on the surface of the ceramic cavity filter module, and the silver layer is separated into a resonance frequency adjusting silver layer and a coupling silver layer by laser ablation.
Preferably, the ceramic cavity filter module is provided with: and the shielding cover is used for shielding the resonance frequency adjusting silver layer and the coupling silver layer.
Preferably, an air window for debugging is formed in the shielding cover.
Preferably, the resonant cavity on the ceramic cavity filter module adopts a through hole structure.
Preferably, the resonant cavity on the ceramic waveguide filter module adopts a deep hole structure.
The invention has the advantages and beneficial effects that: a combined band-pass filter adopts a combination mode of two filtering modules (a ceramic waveguide filtering module and a ceramic cavity filtering module) and has the characteristics of low insertion loss, high suppression, small volume and the like.
The out-of-band resonance of the filter is larger than double frequency and falls to the frequency multiplication position of 2.2.
The in-band loss of the filter is less than 1.0dB.
Drawings
FIG. 1 is a schematic front view of a combined bandpass filter;
FIG. 2 is a schematic illustration of the hidden ceramic waveguide filter module of FIG. 1;
FIG. 3 is a schematic back side view of a combined bandpass filter;
FIG. 4 is a schematic view of the shielded enclosure of FIG. 3 after removal;
FIG. 5 is a schematic view of FIG. 4 after the left silver layer in the sheet form is removed;
fig. 6 is a schematic diagram of the fig. 4 blind ceramic cavity filter module.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
A combined band-pass filter adopts two kinds of microwave low-loss dielectric ceramics to prepare a ceramic waveguide filter module and a ceramic cavity filter module respectively, wherein the two kinds of microwave low-loss dielectric ceramics are both ceramic materials with high dielectric constants;
the ceramic waveguide filter module and the ceramic cavity filter module are combined through silver brushing sintering;
coupling windows are respectively arranged on opposite surfaces of the ceramic waveguide filtering module and the ceramic cavity filtering module;
resonant cavities are respectively arranged on the ceramic waveguide filtering module and the ceramic cavity filtering module; the resonant cavity on the ceramic cavity filter module adopts a through hole structure; the resonant cavity on the ceramic waveguide filter module adopts a deep hole structure;
two resonant cavities are arranged on the ceramic cavity filter module; a resonant frequency adjusting silver layer for adjusting the resonant frequency of a resonant cavity (the resonant cavity on the ceramic cavity filter module) is arranged on the ceramic cavity filter module, and each resonant cavity is provided with one resonant frequency adjusting silver layer;
a coupling silver layer for coupling the two resonant cavities (the two resonant cavities on the ceramic cavity filter module) is arranged on the ceramic cavity filter module;
coating a silver layer on the surface of the ceramic cavity filter module, and separating the silver layer into a resonance frequency adjusting silver layer and a coupling silver layer by laser ablation;
the ceramic cavity filter module is provided with: the shielding cover is used for covering the resonance frequency adjusting silver layer and the coupling silver layer; an air window for debugging is arranged on the shielding cover;
the ceramic waveguide filter module and the resonant cavity on the ceramic cavity filter module form a CT structure through a coupling window, a transmission zero point (the zero point is tunable) is generated at the right side (high frequency) of the passband, and a relatively near parasitic zero point is arranged at the left side (bottom frequency) of the passband; this improves the rejection characteristics of the near end outside the passband of the filter.
Specific embodiments of the invention are as follows:
as shown in fig. 1 to 6, a combined band-pass filter includes: ceramic waveguide filter module based on front ceramic substrate 11 and ceramic cavity filter module based on rear ceramic substrate 12;
the front ceramic matrix 11 and the rear ceramic matrix 12 are respectively prepared by adopting two microwave low-loss dielectric ceramics which are both ceramic materials with high dielectric constants;
the front ceramic matrix 11 is positioned at the front side of the right half part of the front end of the rear ceramic matrix 12, and the rear end of the front ceramic matrix 11 is combined with the right half part of the front end of the rear ceramic matrix 12 through silver brushing sintering;
a central resonant cavity 21 is formed in the center of the front end of the front ceramic substrate 11, the central resonant cavity 21 is a blind hole extending backwards, and the central resonant cavity 21 is a deep hole; a front port bonding pad 31 is arranged on the front side of the middle part of the bottom end of the front ceramic matrix 11; the rear end of the front ceramic substrate 11 is provided with a pair of front strip-shaped coupling windows 41, the pair of front strip-shaped coupling windows 41 are respectively arranged on the upper side and the lower side of the central resonant cavity 21, and the pair of front strip-shaped coupling windows 41 extend along the left-right direction;
a left resonant cavity 22 is formed in the center of the left half part of the front end of the rear ceramic matrix 12, a right resonant cavity 23 is formed in the center of the right half part of the front end of the rear ceramic matrix 12, and the left resonant cavity 22 and the right resonant cavity 23 are through holes extending backwards; the front end of the rear ceramic matrix 12 is also provided with: a coupling groove 5 extending from the front opening of the left resonant cavity 22 to the front opening of the right resonant cavity 23; the right half part of the front end of the rear ceramic substrate 12 is also provided with a pair of rear strip-shaped coupling windows 42, the pair of rear strip-shaped coupling windows 42 are respectively arranged on the upper side and the lower side of the right resonant cavity 23, and the pair of rear strip-shaped coupling windows 42 extend along the left-right direction; the rear strip-shaped coupling windows 42 on the rear ceramic matrix 12 are in one-to-one correspondence with the front strip-shaped coupling windows 41 on the front ceramic matrix 11, and the rear strip-shaped coupling windows 42 are opposite to the corresponding front strip-shaped coupling windows 41; the rear side of the left half of the bottom end of the rear ceramic body 12 is provided with a rear port bonding pad 32; the middle part of the rear end of the rear ceramic matrix 12 is provided with a vertically extending strip-shaped middle silver layer 61, and the strip-shaped middle silver layer 61 is positioned between the rear end opening of the left resonant cavity 22 and the rear end opening of the right resonant cavity 23; the left half part of the rear end of the rear ceramic matrix 12 is provided with a flaky left silver layer 62 covering the rear end opening of the left resonant cavity 22, and the flaky left silver layer 62 is positioned on the left side of the banded middle silver layer 61; the right half part of the rear end of the rear ceramic matrix 12 is provided with a sheet-shaped right silver layer 63 covering the rear end opening of the right resonant cavity 23, and the sheet-shaped right silver layer 63 is positioned on the right side of the strip-shaped middle silver layer 61; forming an outer silver layer by covering the outer surface of the rear ceramic substrate 12 with silver completely, and separating the outer silver layer into a sheet-shaped left silver layer 62, a strip-shaped middle silver layer 61 and a sheet-shaped right silver layer 63 by laser ablation; the rear port pad 32 is coupled with the sheet-like left silver layer 62;
on the rear side of the rear ceramic body 12: a shield case 7 covering the sheet-shaped left silver layer 62, the strip-shaped middle silver layer 61, and the sheet-shaped right silver layer 63; the shielding box 7 is fixedly connected with the rear ceramic matrix 12; the shielding box 7 is provided with an air window 8 for debugging.
The flaky left silver layer 62 is matched with the left resonant cavity 22, and the resonant frequency of the left resonant cavity 22 is adjusted through the flaky left silver layer 62; the right-shaped left silver layer is matched with the right resonant cavity 23, and the resonant frequency of the right resonant cavity 23 is adjusted through the right-shaped left silver layer; the strip-shaped middle silver layer 61 is a coupling silver layer between the left resonant cavity 22 and the right resonant cavity 23; the coupling groove 5 strengthens the coupling between the left resonant cavity 22 and the right resonant cavity 23; the ceramic waveguide filter module and the ceramic cavity filter module are coupled through the front strip-shaped coupling window 41 and the rear strip-shaped coupling window 42 which are opposite to each other.
The front port bonding pad 31 and the front port bonding pad 31 are respectively input and output ports of the combined band-pass filter, and the input and output ports are positioned on the same side of the combined band-pass filter, which is beneficial to the coupling size of the actual debugging ports.
The combined band-pass filter mainly comprises a ceramic waveguide filter module and a ceramic cavity filter module, wherein a CT structure is formed between a central resonant cavity 21 of the ceramic waveguide filter module and a right resonant cavity 23 of the ceramic cavity filter module through a front strip-shaped coupling window 41 and a rear strip-shaped coupling window 42 which are opposite to each other, a transmission zero point (the zero point is tunable) is generated on the right side (high-frequency side) of a passband of the filter, a relatively near parasitic zero point is generated on the left side (bottom frequency side) of the passband of the filter, and the suppression characteristic of the near end outside the passband of the filter can be improved.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (10)
1. A combined band-pass filter is characterized in that two microwave low-loss dielectric ceramics are adopted to respectively prepare a ceramic waveguide filter module and a ceramic cavity filter module; the ceramic waveguide filter module and the ceramic cavity filter module are combined through silver brushing sintering; coupling windows are respectively arranged on opposite surfaces of the ceramic waveguide filtering module and the ceramic cavity filtering module; resonant cavities are respectively arranged on the ceramic waveguide filtering module and the ceramic cavity filtering module, and the resonant cavities on the ceramic waveguide filtering module and the ceramic cavity filtering module form a CT structure through a coupling window;
the ceramic waveguide filtering module is based on a front ceramic matrix, and the ceramic cavity filtering module is based on a rear ceramic matrix; the front ceramic matrix is positioned at the front side of the right half part of the front end of the rear ceramic matrix, and the rear end of the front ceramic matrix is combined with the right half part of the front end of the rear ceramic matrix through silver brushing sintering;
a central resonant cavity is arranged at the center of the front end of the front ceramic matrix; the rear end of the front ceramic matrix is provided with a pair of front strip-shaped coupling windows which are respectively arranged at the upper side and the lower side of the central resonant cavity, and the pair of front strip-shaped coupling windows extend along the left-right direction;
a left resonant cavity is formed in the center of the left half part of the front end of the rear ceramic matrix, and a right resonant cavity is formed in the center of the right half part of the front end of the rear ceramic matrix; the front end of the rear ceramic matrix is also provided with: a coupling groove extending from the front end opening of the left resonant cavity to the front end opening of the right resonant cavity; the right half part of the front end of the rear ceramic matrix is also provided with a pair of rear strip-shaped coupling windows which are respectively arranged at the upper side and the lower side of the right resonant cavity, and the pair of rear strip-shaped coupling windows extend along the left-right direction; the rear strip-shaped coupling windows on the rear ceramic matrix are in one-to-one correspondence with the front strip-shaped coupling windows on the front ceramic matrix, and the rear strip-shaped coupling windows are opposite to the corresponding front strip-shaped coupling windows.
2. The combination bandpass filter according to claim 1, wherein both microwave low-loss dielectric ceramics are high-dielectric-constant ceramic materials.
3. The combination bandpass filter according to claim 1, wherein a resonance frequency adjusting silver layer for adjusting the resonance frequency of the resonant cavity is provided on the ceramic cavity filter module.
4. A combined bandpass filter according to claim 3 wherein two resonant cavities are provided in the ceramic cavity filter module, each resonant cavity being provided with a resonant frequency adjusting silver layer.
5. The combination bandpass filter according to claim 4, wherein a coupling silver layer is provided on the ceramic cavity filter module to couple the two resonators.
6. The combination bandpass filter according to claim 5, wherein the ceramic cavity filter module is coated with a silver layer, and the silver layer is separated into a resonant frequency adjusting silver layer and a coupling silver layer by laser ablation.
7. The combined bandpass filter according to claim 6, wherein the ceramic cavity filter module is provided with: and the shielding cover is used for shielding the resonance frequency adjusting silver layer and the coupling silver layer.
8. The combination bandpass filter according to claim 7, wherein the shielding cover is provided with an air window for debugging.
9. The combination bandpass filter according to claim 1, wherein the resonant cavity on the ceramic cavity filter module is of a through-hole structure.
10. The combination bandpass filter according to claim 1, wherein the resonant cavity on the ceramic waveguide filter module is of deep hole construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210489908.8A CN114899563B (en) | 2022-05-07 | 2022-05-07 | Combined band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210489908.8A CN114899563B (en) | 2022-05-07 | 2022-05-07 | Combined band-pass filter |
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| Publication Number | Publication Date |
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| CN114899563A CN114899563A (en) | 2022-08-12 |
| CN114899563B true CN114899563B (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210489908.8A Active CN114899563B (en) | 2022-05-07 | 2022-05-07 | Combined band-pass filter |
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Citations (6)
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|---|---|---|---|---|
| EP1605540A1 (en) * | 2004-06-09 | 2005-12-14 | Thomson Licensing | Finline type microwave band-pass filter |
| CN104752794A (en) * | 2015-03-30 | 2015-07-01 | 摩比天线技术（深圳）有限公司 | Ceramic dielectric multi-mode filter and assembly method thereof |
| CN109273810A (en) * | 2018-09-11 | 2019-01-25 | 苏州市协诚五金制品有限公司 | A kind of ceramic filter structure and preparation method thereof |
| KR20200062006A (en) * | 2018-11-26 | 2020-06-03 | 주식회사 에이스테크놀로지 | Ceramic Waveguide Filter and Manufacturing Method Thereof |
| CN111916879A (en) * | 2020-07-17 | 2020-11-10 | 西安烽矩电子科技有限公司 | Novel negative coupling device for single-layer dielectric waveguide filter |
| CN112688041A (en) * | 2020-12-17 | 2021-04-20 | 江苏亨通太赫兹技术有限公司 | Multipath cross-coupling millimeter wave filter |
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2022
- 2022-05-07 CN CN202210489908.8A patent/CN114899563B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1605540A1 (en) * | 2004-06-09 | 2005-12-14 | Thomson Licensing | Finline type microwave band-pass filter |
| CN104752794A (en) * | 2015-03-30 | 2015-07-01 | 摩比天线技术（深圳）有限公司 | Ceramic dielectric multi-mode filter and assembly method thereof |
| CN109273810A (en) * | 2018-09-11 | 2019-01-25 | 苏州市协诚五金制品有限公司 | A kind of ceramic filter structure and preparation method thereof |
| KR20200062006A (en) * | 2018-11-26 | 2020-06-03 | 주식회사 에이스테크놀로지 | Ceramic Waveguide Filter and Manufacturing Method Thereof |
| CN111916879A (en) * | 2020-07-17 | 2020-11-10 | 西安烽矩电子科技有限公司 | Novel negative coupling device for single-layer dielectric waveguide filter |
| CN112688041A (en) * | 2020-12-17 | 2021-04-20 | 江苏亨通太赫兹技术有限公司 | Multipath cross-coupling millimeter wave filter |
Non-Patent Citations (2)
| Title |
|---|
| A Modified Capacitive Cross-Coupling Structure for Ceramic-Filled Cavity Filters;Zhengjun Du et.al;《2021 International Conference on Microwave and Millimeter Wave Technology》;全文 * |
| 广义Chebyshev滤波器的交叉耦合模型实现;郗玫;苏涛;梁昌洪;;应用科技(第03期);全文 * |
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