CN110911791A - High-rectangular-coefficient waveguide band-pass filter and design method thereof - Google Patents
High-rectangular-coefficient waveguide band-pass filter and design method thereof Download PDFInfo
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- CN110911791A CN110911791A CN201911334786.XA CN201911334786A CN110911791A CN 110911791 A CN110911791 A CN 110911791A CN 201911334786 A CN201911334786 A CN 201911334786A CN 110911791 A CN110911791 A CN 110911791A
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- waveguide
- rectangular
- coefficient
- bandpass filter
- pass filter
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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
Abstract
The invention discloses a high-rectangular-coefficient waveguide band-pass filter and a design method thereof, wherein the high-rectangular-coefficient waveguide band-pass filter comprises a diaphragm, waveguide resonant cavities, a plurality of cylindrical pins and waveguide cavities, the waveguide cavities are arranged at two ends of the high-rectangular-coefficient waveguide band-pass filter, the waveguide resonant cavities are arranged between the waveguide cavities, the plurality of waveguide resonant cavities are arranged, the cylindrical pins are correspondingly arranged in the waveguide resonant cavities, and the diaphragm is arranged at two sides of the wide side of the high-rectangular-coefficient waveguide band-pass filter; the filter has good rectangular coefficient without increasing the filter stage number and adopting the coupling between non-adjacent resonant cavities, and the out-of-band transmission zero point can be randomly arranged, so the size of the filter can be reduced, the processing difficulty is reduced, the debugging is simpler than that of a cross-coupled filter, and the mass production is easy.
Description
Technical Field
The invention relates to the technical field of filter design, in particular to a high-rectangular-coefficient waveguide band-pass filter and a design method thereof.
Background
Due to the rapid development of the information industry and wireless communication systems, the microwave frequency band is relatively crowded, and in order to reasonably utilize frequency band resources, related departments have more detailed regulations, and the frequency intervals allocated to various communication systems are more and more dense, which puts higher requirements on performance indexes of front-end passive devices in microwave and millimeter wave transceivers, such as smaller insertion loss to reduce the attenuation of the system to signals, and better rectangular coefficient to suppress various interference signals. The waveguide filter has the characteristics of small insertion loss, large power capacity, high working frequency range, easiness in mass production and the like, and is widely applied to a communication system.
The effective method for improving the rectangular coefficient of the filter in the prior art is to increase the number of stages of the filter, the insertion loss of the filter is correspondingly increased by adopting the method, and meanwhile, the weight of the filter is increased along with the increase of the number of stages of the filter, which becomes one of the design difficulties of the waveguide filter.
In view of the above-mentioned drawbacks, the inventors of the present invention have finally obtained the present invention through a long period of research and practice.
Disclosure of Invention
In order to solve the technical defects, the invention adopts the technical scheme that the high-rectangular-coefficient waveguide band-pass filter comprises a diaphragm, waveguide resonant cavities, cylindrical pins and waveguide cavities, wherein the waveguide cavities are arranged at two ends of the high-rectangular-coefficient waveguide band-pass filter, the waveguide resonant cavities are arranged between the waveguide cavities, the waveguide resonant cavities are provided with a plurality of the waveguide resonant cavities, the cylindrical pins are correspondingly arranged in the waveguide resonant cavities, and the diaphragm is arranged at two sides of the wide side of the high-rectangular-coefficient waveguide band-pass filter.
Preferably, the cylindrical pins include a second cylindrical pin, and the second cylindrical pin is disposed in two waveguide resonant cavities nearest to the waveguide cavity and offset from a center line of the high-rectangular-coefficient waveguide band-pass filter.
Preferably, the height dimensions of the second cylindrical pins are different.
Preferably, the cylindrical pins further include a first cylindrical pin, the first cylindrical pin is disposed in the remaining waveguide resonant cavities except for two waveguide resonant cavities closest to the waveguide cavity, and the first cylindrical pin is disposed at a center line position of the high-rectangular-coefficient waveguide band-pass filter.
Preferably, the first cylindrical pin is a metal cylinder with a radius of 0.8mm and a height of 1.5 mm.
Preferably, the diaphragms with the thickness of 1mm are symmetrically distributed on two sides of the wide side of the high-rectangular-coefficient waveguide band-pass filter, and the width of each diaphragm is gradually narrowed from the middle to two ends.
Preferably, the outer right angle of the diaphragm is chamfered, and the radius of the chamfer is 1 mm.
Preferably, a method for designing the high-rectangular-coefficient waveguide bandpass filter includes the steps of:
s1, determining the cross-sectional dimension of the waveguide cavity;
s2, determining the size of the diaphragm;
s3, determining the position and the size of the cylindrical pin;
s4, determining the length of the waveguide resonant cavity;
and S5, establishing an initial model, and optimizing to obtain a model size result.
Compared with the prior art, the invention has the beneficial effects that: the filter has good rectangular coefficient without increasing the filter stage number and adopting the coupling between non-adjacent resonant cavities, and the out-of-band transmission zero point can be randomly set, so the size of the filter can be reduced, the processing difficulty is reduced, the debugging is simpler than that of a cross-coupled filter, and the mass production is easy; in addition, the in-band insertion loss is substantially the same as compared to a Chebyshev waveguide pin filter of the same order.
Drawings
FIG. 1 is a perspective view of the high-rectangular-coefficient waveguide bandpass filter;
FIG. 2 is a top view of the structure of the high-rectangular-coefficient waveguide band-pass filter;
FIG. 3 is a structural side view of the high-square-factor waveguide bandpass filter;
FIG. 4 is a graph of simulated electrical performance of the high-rectangular-coefficient waveguide bandpass filter;
fig. 5 is a flowchart of a design method of the high-rectangular-coefficient waveguide bandpass filter.
The figures in the drawings represent:
1-a membrane; 2-waveguide resonant cavities; 3-cylindrical pins; 4-a waveguide cavity; 31-a first cylindrical pin; 32-second cylindrical pin.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
Example one
As shown in fig. 1, 2 and 3, fig. 1 is a perspective structural view of the high-rectangular-coefficient waveguide bandpass filter; FIG. 2 is a top view of the structure of the high-rectangular-coefficient waveguide band-pass filter; FIG. 3 is a structural side view of the high-square-factor waveguide bandpass filter; the high-rectangular-coefficient waveguide band-pass filter comprises a diaphragm 1, waveguide resonant cavities 2, cylindrical pins 3 and waveguide cavities 4, wherein the waveguide cavities 4 are arranged at two ends of the high-rectangular-coefficient waveguide band-pass filter, the waveguide resonant cavities 2 are arranged between the waveguide cavities 4, the waveguide resonant cavities 2 are provided with a plurality of waveguide resonant cavities, in the embodiment, as shown in fig. 1, the waveguide resonant cavities 2 comprise a first-order waveguide resonant cavity, a second-order waveguide resonant cavity, a third-order waveguide resonant cavity, a fourth-order waveguide resonant cavity and a fifth-order waveguide resonant cavity which extend from one end of the high-rectangular-coefficient waveguide band-pass filter to the other end, the cylindrical pins 3 are correspondingly arranged in the waveguide resonant cavities 2, and the diaphragm 1 is arranged at two sides of the wide side of the high-rectangular-coefficient waveguide.
Specifically, diaphragms with the thickness of 1mm are symmetrically distributed on two sides of the wide side of the high-rectangular-coefficient waveguide band-pass filter, and the width of the diaphragms is from the widthGradually narrows from middle to both ends, and is sequentially w3、w2、w1. And chamfering the outer right angle of the diaphragm 1, wherein the radius of the chamfer circle is 1 mm. The diaphragm 1 in the middle of the high-rectangular-coefficient waveguide band-pass filter is connected with the waveguide resonant cavities 2 on the left side and the right side, and the diaphragms 1 at the two ends of the high-rectangular-coefficient waveguide band-pass filter are connected with the waveguide cavities 4 and the waveguide resonant cavities 2 which have the input/output function.
As shown in fig. 2 and 3, the cylindrical pins 3 include a first cylindrical pin 31 and a second cylindrical pin 32, the first cylindrical pin 31 is disposed in the second-order waveguide resonant cavity, the third-order waveguide resonant cavity, and the fourth-order waveguide resonant cavity, and the first cylindrical pin 31 is disposed at a center line position of the high-rectangular-coefficient waveguide band-pass filter; typically, the first cylindrical pin 31 is provided as a metal cylinder with a radius of 0.8mm and a height h of 1.5 mm.
The second cylindrical pin 32 is arranged in the first-order waveguide resonant cavity and the fifth-order waveguide resonant cavity, is arranged to deviate from the central line of the high-rectangular-coefficient waveguide band-pass filter, and the deviation distance is dx1、dx2The radius of the second cylindrical pin 32 is set to be 0.8mm, and the heights of the second cylindrical pins 32 are respectively set to be h1、h2So as to influence the transmission zero outside the band and improve the rectangular coefficient of the filter.
In order to describe the performance of the invention, the high-rectangular-coefficient waveguide band-pass filter of the embodiment is used for establishing a three-dimensional model in professional electromagnetic field simulation software; as shown in fig. 4, fig. 4 is a graph of simulated electrical performance of the high-rectangular-coefficient waveguide bandpass filter; as can be seen in FIG. 4, the high-k waveguide bandpass filter has a passband, f1To f2All standing waves in the band are less than-20 dB, f01、f02The out-of-band transmission zero can reach 85dB, so that the rectangular coefficient of the filter is improved, and the filter has better out-of-band rejection.
Example two
As shown in fig. 5, fig. 5 is a flow chart of a design method of the high-rectangular-coefficient waveguide bandpass filter; the invention relates to a design method of a high rectangular coefficient waveguide band-pass filter, which is used for designing the high rectangular coefficient waveguide band-pass filter, and the specific design method comprises the following steps:
s1, determining the size of the waveguide, namely searching standard rectangular waveguide tube data according to the frequency range, the space range limited by the structure and the transmission requirement of the main mode at the lowest frequency, and determining the section size of the metal waveguide tube;
s2, determining the size of the diaphragm, namely calculating the coupling between the diaphragms of each step according to the following theoretical formula, establishing a model shown as S2 in figure 5, and changing the size of the diaphragm to enable the coupling value of the model to approach the corresponding calculated value so as to determine the size of the diaphragm of each step;
s3, determining the position and the size of the pin, namely establishing a model as shown in S3 in the figure 5, and determining the position and the size of the pin by enabling the transmission zero point of the model to approach the required transmission zero point through the frequency and the suppression of the out-of-band transmission zero point and changing the position and the size of the pin;
s4, determining the length of the resonant cavity, namely the result obtained in the steps S2 and S3, establishing a model shown as S4 in FIG. 5, and changing the length of the resonant cavity to enable the frequency point where the peak value of the transmission coefficient of the model is located to approach f0Thereby determining the length of the resonant cavity;
and S5, establishing an initial model as shown in figure 1, and optimizing to obtain an ideal result.
The foregoing is merely a preferred embodiment of the invention, which is intended to be illustrative and not limiting. It will be understood by those skilled in the art that various changes, modifications and equivalents may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a high rectangular coefficient waveguide band pass filter, its characterized in that includes diaphragm, waveguide resonant cavity, cylinder pin, waveguide cavity, the waveguide cavity set up in high rectangular coefficient waveguide band pass filter's both ends, waveguide resonant cavity set up in between the waveguide cavity, waveguide resonant cavity is provided with a plurality of, the cylinder pin corresponds the setting in each waveguide resonant cavity, the diaphragm sets up in high rectangular coefficient waveguide band pass filter broadside both sides.
2. The high-rectangular-coefficient waveguide bandpass filter of claim 1 wherein said cylindrical pin comprises a second cylindrical pin, said second cylindrical pin being disposed in two of said waveguide cavities closest to said waveguide cavities and offset from a centerline of said high-rectangular-coefficient waveguide bandpass filter.
3. The high-sff waveguide bandpass filter of claim 2 wherein the second cylindrical pins differ in height dimension.
4. The high-rectangular-coefficient waveguide bandpass filter according to claim 2, wherein the cylindrical pins further comprise a first cylindrical pin, the first cylindrical pin being disposed in the remaining waveguide resonators except for two of the waveguide resonators closest to the waveguide cavity, and the first cylindrical pin being disposed at a position of a center line of the high-rectangular-coefficient waveguide bandpass filter.
5. The high-k waveguide bandpass filter according to claim 4 wherein the first cylindrical pin is provided as a metal cylinder having a radius of 0.8mm and a height of 1.5 mm.
6. The high-k waveguide bandpass filter according to claim 1, wherein the diaphragms with a thickness of 1mm are symmetrically distributed on both sides of the wide side of the high-k waveguide bandpass filter, and the width of the diaphragms gradually narrows from the middle to both ends.
7. The high-k waveguide bandpass filter according to claim 6 wherein the outer right angles of the patches are chamfered with a chamfer radius of 1 mm.
8. A method for designing a high-sff waveguide bandpass filter as recited in claim 1, comprising the steps of:
s1, determining the cross-sectional dimension of the waveguide cavity;
s2, determining the size of the diaphragm;
s3, determining the position and the size of the cylindrical pin;
s4, determining the length of the waveguide resonant cavity;
and S5, establishing an initial model, and optimizing to obtain a model size result.
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