CN121663140A - An improved waveguide filter and its fabrication method - Google Patents
An improved waveguide filter and its fabrication methodInfo
- Publication number
- CN121663140A CN121663140A CN202610007866.8A CN202610007866A CN121663140A CN 121663140 A CN121663140 A CN 121663140A CN 202610007866 A CN202610007866 A CN 202610007866A CN 121663140 A CN121663140 A CN 121663140A
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- CN
- China
- Prior art keywords
- waveguide
- ridge
- cavity
- filter
- improved
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses an improved waveguide filter, which relates to the technical field of filters and comprises a waveguide filter main body and a waveguide cavity arranged in the waveguide filter main body, wherein a plurality of traditional waveguide resonant cavities are partitioned in the waveguide cavity, at least one traditional waveguide resonant cavity is formed into a single-ridge waveguide resonant cavity through a single-ridge waveguide resonator, a transmission zero point is introduced at the high end of the amplitude-frequency characteristic of the filter, the steepness of the high-end amplitude-frequency characteristic is improved, the transmission zero point is naturally introduced at the high end through the single-ridge resonant cavity, a complex coupling structure is not needed, the amplitude-frequency characteristic symmetry is remarkably improved, the steepness of the high end is effectively improved, the insertion loss is basically unchanged, even the insertion loss is slightly reduced due to structural optimization, the design is flexible, the zero point frequency and the depth can be controlled through adjusting single-ridge parameters, the process is compatible with the traditional waveguide, and the mass production and the popularization are convenient.
Description
Technical Field
The invention relates to the technical field of filters, in particular to an improved waveguide filter and a manufacturing method thereof.
Background
The traditional waveguide filter is widely applied to the microwave system due to the advantages of simple structure, large power capacity, low insertion loss and the like. Typical waveguide filters employ half-wavelength resonators in series and achieve inter-cavity coupling through inductive diaphragms. However, the filter has the common problem of asymmetric amplitude-frequency characteristics in the wide-band design that the attenuation of a low frequency band is steep, and the attenuation of a high frequency band is gentle, so that the high-end inhibition capability is insufficient.
To improve high-end performance, it is conventional practice to increase the filter order, but this introduces additional loss, increases volume and cost, and even if transmission zeros are introduced by cross coupling or non-adjacent cavity coupling, the structure is often complex, debugging is difficult, and in-band performance is easily sacrificed.
Disclosure of Invention
The present invention is directed to an improved waveguide filter and a method for fabricating the same, which solve the above-mentioned drawbacks of the prior art.
In order to achieve the above purpose, the invention provides the technical scheme that the improved waveguide filter comprises a waveguide filter main body and a waveguide cavity arranged in the waveguide filter main body, wherein a plurality of traditional waveguide resonant cavities are separated in the waveguide cavity, at least one traditional waveguide resonant cavity is formed into a single-ridge waveguide resonant cavity through a single-ridge waveguide resonator, and the improved waveguide filter is used for introducing a transmission zero point at the high end of the amplitude-frequency characteristic of the filter and improving the steepness of the amplitude-frequency characteristic of the high end.
Preferably, a single-ridge waveguide resonator of a single-ridge waveguide resonator is used to replace at least one half-wavelength waveguide resonator in a conventional waveguide filter.
Preferably, the waveguide filter body further comprises an inductive diaphragm for forming a parallel inductive coupling structure between the resonant cavities.
4. The method for manufacturing improved waveguide filter comprises S1 according to center frequency of filterBandwidth ofDetermining the order n and the number of resonant cavities of the filter, selecting at least one traditional waveguide resonant cavity, adopting a single-ridge waveguide resonator, adopting traditional rectangular waveguide cavities for the rest resonant cavities, establishing a filter model by using three-dimensional electromagnetic simulation software, and determining the ridge height of a single ridgeRidge widthLength of ridge and longitudinal position of ridge in cavityPerforming parameterized scanning to optimize the single-ridge resonant cavity at the target high-end frequencyIntroducing transmission zero points at the positions, ensuring in-band matching and low loss, S2, processing a waveguide cavity by adopting a metal material with high conductivity, adopting a numerical control milling process for one-step forming, adopting a single-ridge structure to ensure electric contact continuity by adopting vacuum brazing connection after being integrally milled or separately processed with the cavity, carrying out surface treatment on the inner wall of the cavity, including polishing, silver plating or gold plating, so as to reduce surface roughness and loss, S3, manufacturing an inductance diaphragm by adopting the same material as the cavity through a linear cutting or photoetching process, wherein the shape of an opening of the diaphragm is rectangular or circular, and the thickness of the diaphragmAnd opening sizeThe method comprises the steps of accurately controlling coupling coefficients according to simulation, installing a diaphragm in a partition plate groove between resonant cavities, adopting conductive adhesive for bonding or laser welding for fixing, S4, installing a tuning screw at the center of each resonant cavity, selecting non-magnetic metal as a screw material, and combining a vector network analyzer for real-time monitoringAndThe method comprises the steps of firstly, carrying out a parameter, sequentially adjusting the depth of each screw, preferentially optimizing the center frequency and the bandwidth, finely adjusting the high-end transmission zero point position, S5, testing the full-band S parameter of the filter, verifying the in-band insertion loss, out-of-band rejection and high-end abruptness, carrying out a temperature cycle and vibration test, verifying the performance stability of the filter under the environmental stress, carrying out helium mass spectrum leak detection on an alloy product, and ensuring that the air tightness meets the high-reliability application requirements. Preferably, in the step S1, the ridge height of the single-ridge waveguide resonant cavityThe method meets the following conditions:
wherein, the Is the waveguide cavity height.
Preferably, in the step S3, the opening area of the inductive diaphragmThe method meets the following conditions: wherein, the For the wavelength of the waveguide,The characteristic impedance is that k is a coupling coefficient, and the value range is 0.05-0.3.
Preferably, the tuning accuracy of the tuning screw in the step S4 is not lower than 0.01And in the tuning process, an iterative optimization algorithm is adopted to realize automatic debugging.
According to the improved waveguide filter and the manufacturing method thereof, the transmission zero is naturally introduced at the high end through the single-ridge resonant cavity, a complex coupling structure is not needed, the amplitude-frequency characteristic symmetry is remarkably improved, the high-end abruptness is effectively improved, the insertion loss is basically unchanged and even slightly reduced due to structural optimization, the design is flexible, the zero frequency and the depth can be controlled by adjusting single-ridge parameters, the process is compatible with the traditional waveguide, and the mass production and popularization are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic diagram of a waveguide filter according to an embodiment of the present invention;
FIG. 2 is a graph showing the comparison between the amplitude-frequency characteristic curve of the conventional waveguide filter and the amplitude-frequency characteristic curve of the improved waveguide filter according to the embodiment of the present invention;
fig. 3 is a process flow chart of a method for manufacturing a wave matching filter body according to an embodiment of the present invention.
Reference numerals illustrate:
1. The waveguide filter comprises a waveguide filter main body, a waveguide cavity, a traditional waveguide resonant cavity, a single-ridge waveguide resonant cavity, an inductance diaphragm and a single-ridge waveguide resonator, wherein the waveguide filter main body comprises a waveguide cavity body, a traditional waveguide resonant cavity, a single-ridge waveguide resonant cavity, an inductance diaphragm and a single-ridge waveguide resonant cavity.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
Referring to fig. 1-3, an improved waveguide filter provided by the embodiment of the invention includes a waveguide filter body 1 and a waveguide cavity 2 provided in the waveguide filter body 1, wherein a plurality of conventional waveguide resonant cavities 3 are separated in the waveguide cavity 2, at least one conventional waveguide resonant cavity 3 is formed into a single-ridge waveguide resonant cavity 4 by a single-ridge waveguide resonator 6, and the single-ridge waveguide resonant cavity is used for introducing a transmission zero at a high end of a filter amplitude-frequency characteristic, so as to improve sharpness of the high-end amplitude-frequency characteristic.
Wherein the single-ridge waveguide resonator 6 of the single-ridge waveguide resonator 4 is used to replace at least one half-wavelength waveguide cavity resonator in a conventional waveguide filter.
The waveguide filter body 1 further comprises an inductive diaphragm 5 for forming a parallel inductive coupling structure between the resonant cavities.
The method for manufacturing improved waveguide filter comprises S1 according to center frequency of filterBandwidth ofDetermining the order n and the number of resonant cavities of the filter, selecting at least one traditional waveguide resonant cavity 3, adopting a single-ridge waveguide resonator 6, adopting traditional rectangular waveguide cavities for the rest resonant cavities, establishing a filter model by using three-dimensional electromagnetic simulation software, and determining the ridge height of a single ridgeRidge widthLength of ridgeLongitudinal position of ridge in cavityPerforming parameterized scanning to optimize the single-ridge resonant cavity at the target high-end frequencyThe process is an electrical design and simulation optimization step, which can optimize the ridge height, ridge width and diaphragm opening by using HFSS software modeling and parameter scanning. Specifically, in the practical embodiment, the simulation result shows that the ridge width is far smaller than the ridge height and is equivalent to the width of the inductive diaphragm, wherein the ridge height is 3.6mm, the ridge width is 1.0mm, the ridge length is 7.5mm, the rotation angle of the ridge is 20 degrees, and a transmission zero point with the depth exceeding-100 dB can be formed at 22.5 GHz.
S2, machining the waveguide cavity 2 by using a metal material with high conductivity, adopting a numerical control milling process to perform one-step molding, adopting a single-ridge structure to perform integral milling or split machining with the cavity and then performing vacuum brazing connection to ensure electric contact continuity, performing surface treatment on the inner wall of the cavity, including polishing, silver plating or gold plating, so as to reduce surface roughness and loss, wherein the process comprises the steps of precisely machining the cavity, and adopting a five-axis numerical control milling machine to machine the cavity structure with the single ridge at one step, wherein the positioning accuracy is +/-0.01 mm. The single ridge and the cavity are designed integrally, and assembly is not needed.
S3, the inductance membrane 5 is made of the same material as the cavity through a linear cutting or photoetching process, and the opening of the membrane is rectangular or circular, and has the thicknessAnd opening sizeThe method comprises the steps of determining a coupling coefficient according to simulation, accurately controlling the coupling coefficient, installing a diaphragm in a baffle groove between resonant cavities, adopting conductive adhesive for bonding or laser welding for fixing, and carrying out surface treatment on the diaphragm, wherein in a preferred practical embodiment, the inner wall of the cavity is mechanically polished until Ra is less than or equal to 0.4 mu m, then chemical silver plating is carried out, and the thickness of a plating layer is 4-6 mu m.
S4, installing a tuning screw at the center of each resonant cavity, wherein the screw material is nonmagnetic adjustable metal, and combining with a vector network analyzer to monitor in real timeAndThe method comprises the steps of setting a vector network analyzer, setting a tuning screw, setting a parameter, sequentially adjusting the depth of each screw, preferentially optimizing the center frequency and the bandwidth, finely adjusting the high-end transmission zero point position, and connecting the vector network analyzer with automatic tuning software after the tuning screw is installed. And sequentially adjusting the depth of each screw by adopting an iterative algorithm, preferentially optimizing passband matching, and finely adjusting the transmission zero position.
S5, testing full-band S parameters of the filter (which can be tested in natural environment, preferably in a microwave darkroom), verifying in-band insertion loss, out-of-band rejection and high-end abruptness, performing temperature cycle and vibration test, verifying the performance stability of the filter under environmental stress, performing helium mass spectrum leak detection on a qualified product, and ensuring that the air tightness meets the high-reliability application requirements.
Wherein, in step S1, the ridge height of the single-ridge waveguide resonant cavity 4 is higherThe method meets the following conditions: wherein, the For the wavelength of the waveguide,The characteristic impedance is that k is a coupling coefficient, and the value range is 0.05-0.3. Wherein the tuning accuracy of the tuning screw in step S4 is not lower than 0.01And in the tuning process, an iterative optimization algorithm is adopted to realize automatic debugging.
In a specific embodiment, a 7-cavity structure is adopted in the waveguide filter main body 1, wherein the 4 th cavity is preferably a single-ridge waveguide resonant cavity 4, and the cavity material is preferably aluminum magnesium alloy AlMg3. Furthermore, the height of the single ridge can be dynamically adjusted through the micro actuator, so that the transmission zero frequency can be adjusted within a range of +/-5%. The method is suitable for cognitive radio and frequency agility systems. Meanwhile, the ridge part is designed in a split mode, the distance between the ridge and the top wall is changed through the piezoelectric ceramic actuator, the zero position is dynamically adjusted by the control system according to a communication protocol, and the tuning track is optimized by adopting a machine learning algorithm in the debugging process.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (7)
1. The utility model provides an improved generation waveguide filter, includes waveguide filter main part and sets up the waveguide cavity in waveguide filter main part, the waveguide cavity internal division has a plurality of traditional waveguide resonant cavities, its characterized in that: at least one traditional waveguide resonant cavity is formed into a single-ridge waveguide resonant cavity through a single-ridge waveguide resonator, and the single-ridge waveguide resonant cavity is used for introducing a transmission zero at the high end of the amplitude-frequency characteristic of the filter, so that the sharpness of the high-end amplitude-frequency characteristic is improved.
2. An improved waveguide filter according to claim 1, wherein a single-ridge waveguide resonator of a single-ridge waveguide resonator is used to replace at least one half-wavelength waveguide resonator of a conventional waveguide filter.
3. An improved waveguide filter according to claim 1, wherein the waveguide filter body further comprises an inductive diaphragm for forming a parallel inductive coupling between the resonant cavities.
4. A method of making an improved waveguide filter as claimed in any of claims 1-3, comprising the steps of
S1, according to the center frequency of the filter、Determining the order n and the number of resonant cavities of the filter, selecting at least one traditional waveguide resonant cavity, adopting a single-ridge waveguide resonator, adopting traditional rectangular waveguide cavities for the rest resonant cavities, establishing a filter model by using three-dimensional electromagnetic simulation software, and determining the ridge height of a single ridgeA ridge width,Ridge lengthLongitudinal position of ridge in cavityPerforming parameterized scanning to optimize the single-ridge resonant cavity at the target high-end frequencyIntroducing a transmission zero point at the position, and ensuring in-band matching and low loss;
S2, machining the waveguide cavity by using a metal material with high conductivity, and adopting a numerical control milling process for one-step forming, wherein the single-ridge structure is integrally milled with the cavity or separately machined and then connected with the cavity by vacuum brazing to ensure electric contact continuity;
s3, the inductance diaphragm is made of the same material as the cavity through a linear cutting or photoetching process, and the opening of the diaphragm is rectangular or circular, and has the thickness And opening sizePerforming accurate control according to the coupling coefficient determined by simulation; the diaphragm is arranged in a baffle plate groove between the resonant cavities, and is fixed by adopting conductive adhesive bonding or laser welding; the diaphragm is arranged in a baffle plate groove between the resonant cavities and is fixed by adopting conductive adhesive bonding or laser welding;
s4, installing a tuning screw at the center of each resonant cavity, wherein the screw material is non-magnetic metal, and combining with a vector network analyzer for real-time monitoring AndSequentially adjusting the depth of each screw, optimizing the center frequency and the bandwidth preferentially, and fine adjusting the high-end transmission zero position;
S5, testing full-band S parameters of the filter, verifying in-band insertion loss, out-of-band rejection and high-end abruptness, performing temperature cycle and vibration test, verifying performance stability of the filter under environmental stress, performing helium mass spectrum leak detection on an alloy product, and ensuring that the air tightness meets high-reliability application requirements.
5. The method for manufacturing an improved waveguide filter as claimed in claim 4, wherein the ridge height of the single-ridge waveguide resonator in step S1 isThe method meets the following conditions:
wherein, the Is the waveguide cavity height.
6. The method of manufacturing an improved waveguide filter as in claim 4, wherein in step S3 the opening area of the inductive diaphragm isThe method meets the following conditions:
wherein, the For the wavelength of the waveguide,The characteristic impedance is that k is a coupling coefficient, and the value range is 0.05-0.3.
7. The method for manufacturing an improved waveguide filter according to claim 4, wherein the tuning accuracy of the tuning screw in step S4 is not lower than 0.01And in the tuning process, an iterative optimization algorithm is adopted to realize automatic debugging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202610007866.8A CN121663140A (en) | 2026-01-06 | 2026-01-06 | An improved waveguide filter and its fabrication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202610007866.8A CN121663140A (en) | 2026-01-06 | 2026-01-06 | An improved waveguide filter and its fabrication method |
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| Publication Number | Publication Date |
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| CN121663140A true CN121663140A (en) | 2026-03-13 |
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| CN202610007866.8A Pending CN121663140A (en) | 2026-01-06 | 2026-01-06 | An improved waveguide filter and its fabrication method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675631A (en) * | 1985-01-17 | 1987-06-23 | M/A-Com, Inc. | Waveguide bandpass filter |
| EP1492194A1 (en) * | 2003-06-24 | 2004-12-29 | BSC Filters Ltd | Bandpass filter and diplexer |
| EP1564835A1 (en) * | 2004-02-16 | 2005-08-17 | Siemens Mobile Communications S.p.A. | Inline waveguide filter with up to two out-of-band transmission zeros |
| CN102709630A (en) * | 2011-06-02 | 2012-10-03 | 无锡波联电科技有限公司 | Filter of satellite communication earth station receiver |
| US20130154772A1 (en) * | 2010-07-09 | 2013-06-20 | Politecnico Di Milano | Waveguide band-pass filter with pseudo-elliptic response |
-
2026
- 2026-01-06 CN CN202610007866.8A patent/CN121663140A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675631A (en) * | 1985-01-17 | 1987-06-23 | M/A-Com, Inc. | Waveguide bandpass filter |
| EP1492194A1 (en) * | 2003-06-24 | 2004-12-29 | BSC Filters Ltd | Bandpass filter and diplexer |
| EP1564835A1 (en) * | 2004-02-16 | 2005-08-17 | Siemens Mobile Communications S.p.A. | Inline waveguide filter with up to two out-of-band transmission zeros |
| US20130154772A1 (en) * | 2010-07-09 | 2013-06-20 | Politecnico Di Milano | Waveguide band-pass filter with pseudo-elliptic response |
| CN102709630A (en) * | 2011-06-02 | 2012-10-03 | 无锡波联电科技有限公司 | Filter of satellite communication earth station receiver |
Non-Patent Citations (1)
| Title |
|---|
| SIMONE BASTIOLI DIEI, UNIVERSITY OF PERUGIA, PERUGIA, ITALY ; LUCA MARCACCIOLI; ROBERTO SORRENTINO: "《Novel waveguide pseudo-elliptic filters using slant ridge resonators》", 《2008 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST》, 20 June 2008 (2008-06-20), pages 1 - 7 * |
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