CN110690544A - high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth - Google Patents
high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth Download PDFInfo
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- CN110690544A CN110690544A CN201910945130.5A CN201910945130A CN110690544A CN 110690544 A CN110690544 A CN 110690544A CN 201910945130 A CN201910945130 A CN 201910945130A CN 110690544 A CN110690544 A CN 110690544A
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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
Abstract
A high Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth comprises a metal bottom plate, a metal upright post and a metal top plate which are arranged on the metal bottom plate, wherein an air gap is arranged between the metal upright post and the metal top plate, four corners of the metal bottom plate are provided with concave structures, four corners of the metal top plate are provided with convex structures, the concave structures and the convex structures are wedged, M3 screw holes are respectively arranged at the wedged parts, the metal upright post, the metal bottom plate, the metal top plate and the air gap form a first resonant cavity and a second resonant cavity of the filter, and a row of metal upright columns are arranged between the resonant cavities and used for energy coupling between the resonant cavities, a first rectangular groove is arranged on a metal bottom plate at the center of the first resonant cavity, a second rectangular groove is arranged on a metal top plate at the center of the second resonant cavity, and the first rectangular groove and the second rectangular groove are respectively used for slotting feed by using a second standard waveguide flange and a first standard waveguide flange from the bottom and the top. The dual-band antenna has the characteristics of high quality factor, flexible and controllable working frequency and bandwidth of dual bands.
Description
Technical Field
The invention relates to the technical field of waveguide resonant cavity filters, in particular to a high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth.
Background
Due to the increasingly tense frequency spectrum and high data rate requirements of communication systems, the frequency of the communication systems is continuously expanded to high frequency, and as the frequency bands of the communication systems are expanded to millimeter waves and are increased, the communication systems are more and more complex, and the performances of low loss, low cost, miniaturization and the like become necessary requirements for millimeter wave devices.
In the millimeter wave frequency band, the microstrip line structure is not suitable for the application of the millimeter wave frequency band due to large radiation loss and dielectric loss, low power capacity and serious dispersion effect; the substrate integrated waveguide also has the defect of large dielectric loss, and the manufacturing process is more complicated; the rectangular waveguide is generally made of two parts and connected together due to the traditional hollow rectangular waveguide, and the two metal structures generally have the problems of energy leakage and quality factor reduction caused by poor electric contact, and meanwhile, the rectangular waveguide also has the problems of narrow bandwidth and difficulty in integration.
In recent years, slot waveguide technology has attracted general attention. The technology solves the problem that the energy of the traditional rectangular waveguide filter leaks through the gap, and factors such as metal surface roughness and metal oxidation have small influence on the quality factor of the gap waveguide structure filter. The technique solves the problems existing in the application of the traditional rectangular waveguide filter well. Compared with the traditional transmission line, the slot waveguide also has the advantages of low transmission loss, wide working frequency band, high integration level, no need of packaging, capability of inhibiting surface waves, high isolation and the like. Due to the structure and performance characteristics of the slot waveguide, the slot waveguide has wide application prospect and great commercial value in millimeter wave high-frequency band communication systems. The slot waveguide is very expected to become one of the important application schemes of the future millimeter wave communication system.
The increasingly tense and fine spectrum resources and frequency bands of the communication system are more and more, and the communication system generally requires the compatibility of a plurality of frequency bands, so that the communication system is complicated and has a huge size, and the resource waste is caused, so that the cost is increased. If a multi-band transceiver is adopted, the number of a plurality of components of the system can be reduced by times, so that the system volume can be reduced, and the system power consumption and the equipment cost can be reduced. The design of the multi-mode and multi-band filter provides an important design idea for miniaturization and low cost of devices, but the design and application of the multi-mode and multi-band filter are difficult due to the fact that modes of a multi-mode cavity are complex and difficult to control.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a high Q dual-mode dual-band filter with a flexibly controllable operating frequency band and bandwidth, which has the characteristics of high quality factor, and flexibly controllable operating frequency and bandwidth of dual-band.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth comprises a metal bottom plate 1, metal columns 7 and a metal top plate 2, wherein the metal columns 7 and the metal top plate 2 are positioned on the metal bottom plate, air gaps 9 are formed between the metal columns 7 and the metal top plate 2, concave structures are arranged at four corners of the metal bottom plate 1, convex structures are arranged at four corners of the metal top plate 2, the concave structures and the convex structures are wedged, M3 screw holes 3 are respectively arranged at the wedged positions, the metal columns 7, the metal bottom plate 1, the metal top plate 2 and the air gaps 9 form a first resonant cavity 10 and a second resonant cavity 11 of the filter, a row of metal columns 12 are arranged between the first resonant cavity 10 and the second resonant cavity 11 and are used for energy coupling between the resonant cavities, a first rectangular groove 5.2 is arranged on the metal bottom plate 1 at the center of the first resonant cavity, a second rectangular groove 5.1 is arranged on the metal, the first rectangular slot 5.2 is fed by slotting from the bottom by using the second standard waveguide flange 4.1, and the second rectangular slot 5.1 is fed by slotting from the top by using the first standard waveguide flange 4.2.
The metal bottom plate 1 and the metal roof 2 of wave filter are thickness 2 mm's cuboid, protruding font structure and concave font structure be concave font pillar and convex font pillar respectively, the shape, size and the arrangement angle of four concave font structures are the same completely.
The cross sections of the four concave-shaped pillars are 5mm multiplied by 10mm square, the height is 3.5mm, and the centers of the four concave-shaped pillars are respectively provided with four screw holes 3 with the diameter of 3 mm;
the cross sections of the four convex-shaped pillars are 5mm multiplied by 5mm square, the height is 2mm, and the centers of the four convex-shaped pillars are respectively provided with four screw holes 3 with the diameter of 3 mm.
The metal upright posts 7 are cuboids with the height of 3mm and the section of 1mm multiplied by 1mm, and the interval between the metal upright posts 7 is 1 mm.
The height of the air gap 9 is 0.5 mm.
The width of the two resonant cavities is 11.2mm, and the length of the two resonant cavities is 11.8 mm.
The energy coupling mode between the two resonant cavities is hybrid coupling, and the section of a metal upright post 7 between the resonant cavities is a rectangle with the size of 1mm multiplied by 1.9 mm.
Two perturbation metal upright columns 8 are respectively introduced into the opposite angles of the two resonant cavities, the distances from the perturbation metal upright columns 8 to the two cavity sides are respectively 0.45mm and 0.4mm, and the cross section of each perturbation metal upright column 8 is 0.8mm multiplied by 1 mm.
The size of the slot is a cuboid of 7.12mm multiplied by 1.15mm multiplied by 2mm, chamfer angles with the radius of 1.103mm of 45 degrees are formed on two long edges of the slot on the outer side of the filter, so that progressive matching of the standard waveguide is formed, and the standard waveguide flange and the slot respectively rotate around the centers of the two resonant cavities by 22 degrees in a counterclockwise mode.
The invention has the beneficial effects that:
the resonant cavity is realized by utilizing a slot waveguide technology, air is filled in the resonant cavity, the resonant cavity has a higher unloaded quality factor (4500), compared with a traditional rectangular waveguide filter, the filter has a higher actually-realized quality factor, the filter separates two polarization degenerate modes of TE102 and TE201 by introducing a perturbation structure, two pass bands are generated by utilizing the two modes, the center frequency and the bandwidth of the two pass bands are flexible and controllable, and two transmission zeros are arranged on two sides of the low pass band, so that the filter has the advantage of stronger selectivity.
Drawings
Fig. 1 is a schematic view of the overall structure of a metal ceiling plate 2 according to the present invention.
Fig. 2 is a top view of the metal top plate 2 of the present invention.
Fig. 3 is a schematic view of the overall structure of the metal-free top plate 2 of the present invention.
Fig. 4 is a top view of the metal-free top plate 2 of the present invention.
Fig. 5 is a graph of simulation results of return loss and insertion loss of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth comprises a metal bottom plate 1, a metal upright post 7 and a metal top plate 2, wherein the metal upright post and the metal top plate 2 are both cuboids and provide ground for the filter.
Four corners of the metal bottom plate 1 are provided with 4 concave supporting columns, four corners of the metal top plate 2 are provided with 4 convex supporting columns, the two supporting columns are wedged and used for supporting and positioning, and four corners of the metal top plate 2 and four corners of the metal bottom plate 1 are reserved with 4M 3 screw holes 3 for reinforcement.
The cross sections of the four concave-shaped pillars are 5mm multiplied by 10mm square, the height is 3.5mm, and the centers of the four concave-shaped pillars are respectively provided with four screw holes 3 with the diameter of 3 mm.
The cross sections of the four convex-shaped pillars are 5mm multiplied by 5mm square, the height is 2mm, and the centers of the four convex-shaped pillars are respectively provided with four screw holes 3 with the diameter of 3 mm.
The metal upright posts 7 are cuboids with the height of 3mm and the section of 1mm multiplied by 1mm, the interval between the metal upright posts is 1mm, the metal upright posts 7, the air gap 9, the metal top plate 2 and the metal bottom plate 1 form an electromagnetic band gap structure, the electromagnetic field is attenuated by more than 45dB after passing through the two rows of metal upright posts, therefore, the energy leakage can be ignored, and the section size and the interval of the local metal upright posts are properly adjusted in order to keep the periodicity of the electromagnetic band gap structure and meet the requirement of the coupling coefficient between the resonant cavities.
The height of the air gap 9 is 0.5 mm.
Referring to fig. 3 and 4, the width of the two resonant cavities is wid equal to 11.2mm, and the length of the two resonant cavities is len equal to 11.8mm, and the operating frequency of the two pass bands can be flexibly controlled by adjusting the length ratio of the resonant cavities, wherein the larger the length ratio is, the larger the distance between the two pass bands is.
The energy coupling mode between the two resonant cavities is hybrid coupling, the section of a metal column between the resonant cavities is a rectangle with the size of 1mm multiplied by 1.9mm, Sz is the length of the section of the metal column with the size of 1.9mm, the coupling coefficient between the resonant cavities can be adjusted by adjusting the section length Sz and the distance St between the metal column and the side wall of the resonant cavity, wherein the electric coupling is more sensitive to Sz, and the smaller Sz is, the larger the electric coupling coefficient between the cavities is. The magnetic coupling is sensitive to the distance St between the metal column and the side wall of the resonant cavity, and the larger St is, the larger the magnetic coupling coefficient between the cavities is.
Two perturbation metal columns 8 are respectively introduced to opposite corners of the resonator so as to separate two polarization degenerate modes TE102 and TE201, coupling coefficients between the modes can be flexibly controlled by adjusting the structure of the perturbation metal columns, the distances from the perturbation metal columns to two cavity sides are dx which is 0.45mm and dy which is 0.4mm, and the sections of the metal columns are 0.8mm multiplied by 1 mm.
The filter utilizes standard waveguide flanges 4.1 and 4.2 to respectively perform slot feeding from the bottom side of the first cavity and the top side of the second cavity, modes excited in the cavity can be flexibly controlled by adjusting the rotation angle of the slots relative to the center of the cavity, when the rotation angle is 0-5 degrees, a TE102 mode (TE201 mode component is small and is ignored) is excited, at the moment, the filter can be regarded as single-mode excitation, when the rotation angle is 70-90 degrees, a source is regarded as only exciting the TE201 mode in the cavity, and when the rotation angle is 5-70 degrees, the source excites two modes in the cavity. The coupling relation between an intracavity mode and a source and a load is simplified, and screw holes of M3 are reserved at four corners of a standard waveguide flange;
the size of the slot is a cuboid with the size of 7.12mm multiplied by 1.15mm multiplied by 2mm, wherein dp is 1.15mm and is the width of the slot, and two long edges of the slot at the outer sides of the bottom plate and the top plate of the filter are chamfered with the radius of 1.103mm at 45 degrees, so that the progressive matching of the standard waveguide is formed, and the standard waveguide flange and the slot respectively rotate around the centers of the two resonant cavities by 22 degrees anticlockwise;
the working principle of the high Q dual-mode dual-band filter with the flexibly controllable working frequency band and bandwidth is as follows:
the high Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth utilizes an electromagnetic band gap structure in principle, and the metal bottom plate 1, the metal top plate 2, the metal upright post 7 and the air gap 9 form the electromagnetic band gap structure. When the frequency is in the stop band of the electromagnetic band gap (the air gap is less than a quarter wavelength), the electromagnetic wave can not be transmitted, and the filter is designed by utilizing the stop band of the electromagnetic band gap structure and has a higher quality factor. By utilizing two polarization degenerate modes TE102 and TE201 of the resonant cavity, the structural perturbation metal upright post 8 is introduced to separate and mutually couple the two modes, and the two modes respectively form two pass bands by adjusting the coupling coefficient, thereby realizing miniaturization; the standard waveguide flange is used for slotting and feeding from the bottom side and the top side, and the rotation angle of the slot relative to the center of the resonant cavity is adjusted to realize flexible control of external quality factors of two modes, namely two pass bands; the coupling coefficients of the electric coupling and the magnetic coupling of the electromagnetic hybrid coupling between the cavities can also be flexibly adjusted; the center frequencies of the two pass bands can be adjusted through the proportion of the long side and the short side of the resonant cavity, so that the dual-mode dual-band filter with flexibly adjustable working frequency band and bandwidth is realized.
FIG. 5 is a simulation result of the return loss and insertion loss of the high Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth according to the present invention, the center frequency of the low pass band of the filter is 28.14GHz, the bandwidth of the pass band is 188MHz, the return loss in the pass band is less than-20 dB, the insertion loss in the pass band is 0.4dB, the center frequency of the high pass band is 31.81GHz, the bandwidth of the pass band is 776MHz, the return loss in the pass band is less than-20 dB, the insertion loss in the pass band is 0.2dB, and the transmission zeros are respectively arranged at the left and the right of the low pass band, such that the sharp drop characteristic of the.
Claims (9)
1. A high Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth is characterized by comprising a metal base plate (1), metal columns (7) and a metal top plate (2) which are positioned on the metal base plate, air gaps (9) are formed between the metal columns (7) and the metal top plate (2), concave structures are arranged at four corners of the metal base plate (1), convex structures are arranged at four corners of the metal top plate (2), the concave structures and the convex structures are wedged, M3 screw holes (3) are respectively arranged at the wedged parts, the metal columns (7), the metal base plate (1), the metal top plate (2) and the air gaps (9) form a first resonant cavity (10) and a second resonant cavity (11) of the filter together, and a row of metal columns (12) are arranged between the first resonant cavity (10) and the second resonant cavity (11) and are used for energy coupling between the resonant cavities, a first rectangular groove (5.2) is formed in the first resonant cavity central metal bottom plate (1), a second rectangular groove (5.1) is formed in the second resonant cavity central metal top plate (2), the first rectangular groove (5.2) is subjected to slotting feed through the second standard waveguide flange (4.1) from the bottom, and the second rectangular groove (5.1) is subjected to slotting feed through the first standard waveguide flange (4.2) from the top.
2. The high-Q dual-mode dual-band filter with flexibly controllable working band and bandwidth as claimed in claim 1, wherein the metal bottom plate (1) and the metal top plate (2) of the filter are cuboids with a thickness of 2mm, the convex-shaped structures and the concave-shaped structures are concave-shaped pillars and convex-shaped pillars, respectively, and the shapes, sizes and arrangement angles of the four concave-shaped structures are completely the same.
3. The high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth as claimed in claim 2, wherein the cross section of the four concave-shaped pillars is a square of 5mm x 10mm, the height is 3.5mm, and the centers of the four concave-shaped pillars are respectively provided with four screw holes (3) with the diameter of 3 mm;
the cross sections of the four convex-shaped pillars are 5mm multiplied by 5mm square, the height is 2mm, and the centers of the four convex-shaped pillars are respectively provided with four screw holes (3) with the diameter of 3 mm.
4. The high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth as claimed in claim 1, wherein the metal columns (7) are cuboids with a height of 3mm and a cross section of 1mm x 1mm, and the metal columns (7) are spaced by 1 mm.
5. A high Q dual-mode dual-band filter with flexibly controllable operating band and bandwidth according to claim 1, characterized in that the height of the air gap (9) is 0.5 mm.
6. The high-Q dual-mode dual-band filter with flexibly controllable operating frequency band and bandwidth as claimed in claim 1, wherein the width of each of the two resonators is 11.2mm, and the length of each resonator is 11.8 mm.
7. The high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth as claimed in claim 1, wherein the energy coupling between the two resonant cavities is hybrid coupling, and the cross section of the metal pillar 7 between the resonant cavities is rectangular with 1mm x 1.9 mm.
8. The high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth as claimed in claim 1, wherein two perturbation metal pillars (8) are respectively introduced into the opposite corners of the two resonant cavities, the distances between the perturbation metal pillars (8) and the two cavity sides are respectively 0.45mm and 0.4mm, and the cross section of the perturbation metal pillar (8) is 0.8mm x 1 mm.
9. The high-Q dual-mode dual-band filter with the flexibly controllable working frequency band and the flexibly controllable bandwidth as claimed in claim 1, wherein the slot is a cuboid with the size of 7.12mm x 1.15mm x 2mm, and two long sides of the slot outside the filter are chamfered with the radius of 1.103mm at 45 degrees, so that progressive matching of the standard waveguide is formed, and the flange of the standard waveguide and the slot are respectively rotated 22 degrees anticlockwise around the centers of the two resonant cavities.
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| CN201910945130.5A CN110690544A (en) | 2019-09-30 | 2019-09-30 | high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth |
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| CN201910945130.5A CN110690544A (en) | 2019-09-30 | 2019-09-30 | high-Q dual-mode dual-band filter with flexibly controllable working frequency band and bandwidth |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113097722A (en) * | 2021-03-09 | 2021-07-09 | 北京邮电大学 | Common-caliber double-frequency transmission line capable of working in microwave/millimeter wave frequency band |
| CN114865261A (en) * | 2021-02-04 | 2022-08-05 | 广州程星通信科技有限公司 | Space power combiner based on electromagnetic forbidden band structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873243A (en) * | 2019-01-31 | 2019-06-11 | 西安交通大学 | A kind of cross-linked gap waveguide microwave filter of high Q |
| CN110112522A (en) * | 2019-05-31 | 2019-08-09 | 河南思维轨道交通技术研究院有限公司 | A kind of high Q dual mode filter of stack based on gap waveguide technology |
-
2019
- 2019-09-30 CN CN201910945130.5A patent/CN110690544A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873243A (en) * | 2019-01-31 | 2019-06-11 | 西安交通大学 | A kind of cross-linked gap waveguide microwave filter of high Q |
| CN110112522A (en) * | 2019-05-31 | 2019-08-09 | 河南思维轨道交通技术研究院有限公司 | A kind of high Q dual mode filter of stack based on gap waveguide technology |
Non-Patent Citations (1)
| Title |
|---|
| ASHRAF UZ ZAMAN ET AL.: "Narrow-Band Microwave Filter Using High-Q Groove Gap Waveguide Resonators With Manufacturing Flexibility and No Sidewalls", 《IEEE TRANSACTIONS ON COMPONENTS, PACKAGING AND MANUFACTURING TECHNOLOGY》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114865261A (en) * | 2021-02-04 | 2022-08-05 | 广州程星通信科技有限公司 | Space power combiner based on electromagnetic forbidden band structure |
| CN113097722A (en) * | 2021-03-09 | 2021-07-09 | 北京邮电大学 | Common-caliber double-frequency transmission line capable of working in microwave/millimeter wave frequency band |
| CN113097722B (en) * | 2021-03-09 | 2022-04-12 | 北京邮电大学 | Common-caliber double-frequency transmission line capable of working in microwave/millimeter wave frequency band |
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