CN116646700A - W-band ultra-wideband waveguide filter - Google Patents
W-band ultra-wideband waveguide filter Download PDFInfo
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- CN116646700A CN116646700A CN202310846656.4A CN202310846656A CN116646700A CN 116646700 A CN116646700 A CN 116646700A CN 202310846656 A CN202310846656 A CN 202310846656A CN 116646700 A CN116646700 A CN 116646700A
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- wideband
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- 239000002184 metal Substances 0.000 claims abstract description 25
- 230000008878 coupling Effects 0.000 claims abstract description 21
- 238000010168 coupling process Methods 0.000 claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 claims abstract description 21
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- 230000002146 bilateral effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 abstract description 11
- 238000013461 design Methods 0.000 abstract description 9
- 238000004088 simulation Methods 0.000 abstract description 7
- 230000001629 suppression Effects 0.000 abstract description 5
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 6
- 230000004044 response Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005323 electroforming Methods 0.000 description 1
- 238000005316 response function Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to the technical field of microwaves, and particularly relates to a W-band ultra-wideband waveguide filter, which structurally comprises a resonant cavity and a metal loading capacitor, wherein a downlink filter port and an uplink filter port are arranged at the front end of the cavity; the resonance unit consists of nine resonance cavities, and two adjacent resonance cavities are connected in a direct coupling mode; a metal column is inserted into the H surface of each resonant cavity by utilizing a capacitive loading technology, so that ultra-wideband, high out-of-band suppression and miniaturization are realized; the structure of the invention is formed by offset coupling of 9 rectangular resonant cavities, circular metal is inserted into the resonant cavities, and the whole structure is symmetrical about the 5 th resonant cavity; the structure has fewer parameters in simulation optimization, reduces design time and improves design efficiency.
Description
Technical Field
The invention belongs to the technical field of microwaves, and particularly relates to a W-band ultra-wideband waveguide filter.
Background
With the rapid development of microwave technology, the use of frequency spectrum is increasingly crowded, and research is turned to development of high frequency bands, and the frequency spectrum is increased to terahertz wave bands. Various communication systems today must coexist in a limited Electromagnetic (EM) spectrum that is allocated to many commercial applications in the microwave frequency band. In such crowded environments, interference of the system with adjacent frequency bands becomes a critical issue, particularly as capacity requirements increase. In order to reasonably utilize the frequency band resources, the related departments issue detailed spectrum division standards. The W wave band refers to an electromagnetic signal with the frequency range of 75GHz-110 GHz, and the signal in the wave band has frequency band resources which are not developed in ultra-wideband, so that the W wave band is a research direction which is highly valued by scientific researchers.
The filter functions to selectively transmit certain frequency signals and suppress other frequency signals. In the design of key components of a W-band signal source spread spectrum system, a frequency multiplier for frequency expansion can multiply the fundamental wave signal of 37.5GHz-55GHz to 75GHz-110 GHz, and in order to further improve the frequency spectrum characteristic of the system, a broadband band-pass filter with good passband characteristic and out-of-band rejection characteristic is also required to be designed, and after the filter is cascaded in the frequency multiplication source, a target signal can pass through and leakage of fundamental wave and out-of-band harmonic frequency is prevented.
The existing filter at present comprises a tenth-order chebyshev response filter, the filter adopts an electroforming processing technology to realize low insertion loss, the filter adopts a direct magnetic coupling mode, 21% of bandwidth is realized by increasing the order of the filter, and 0.4dB low insertion loss is obtained; but the filter overall structure is relatively bulky due to the structural characteristics of the waveguide. A capacitor loading broadband waveguide filter has a passband of 17.4 GHz-21.6 GHz, in-band S11 less than-20 dB, suppression at 16.5GHz greater than 56dB, suppression at 22.5GHz greater than 46dB, and suppression between 24.3 GHz and 35GHz greater than 91dB; the filter is loaded with the capacitor on the basis of the diaphragm waveguide filter, the length of a resonant cavity loaded by the capacitor is greatly shortened, the volume of the filter is effectively reduced, and out-of-band rejection is improved; but the bandwidth of the filter is narrower, the parameters are more, and the workload is larger during modeling simulation.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a W-band ultra-wideband waveguide filter, which comprises a cavity, wherein the front end of the cavity is provided with a downlink filter port and an uplink filter port; the resonant unit is arranged in the cavity and consists of nine resonant cavities, and two adjacent resonant cavities are connected in a direct coupling mode; and a metal column is inserted into the H surface of each resonant cavity, so that capacitive loading is realized.
Preferably, the connecting of the adjacent two resonant cavities by direct coupling comprises: each resonator achieves magnetic coupling by being offset from the coupling window of an adjacent resonator.
Preferably, the resonance unit has a bilateral symmetry structure with respect to the 5 th resonance cavity in the middle.
Preferably, the ultra-wideband filter has a standard WR-10 rectangular waveguide port height, and the input/output port is set as the standard WR-10 rectangular waveguide port.
The invention has the beneficial effects that:
the design of the filter is realized by adopting a mode of loading the metal column by the offset magnetic coupling structure, so that the passband range of the filter can cover the whole W wave band and has good rectangular coefficient; the structure of the invention is formed by offset coupling of 9 rectangular resonant cavities, circular metal is inserted into the resonant cavities, and the whole structure is symmetrical about the 5 th resonant cavity; the structure has fewer parameters in simulation optimization, reduces design time and improves design efficiency.
Drawings
FIG. 1 is a three-dimensional block diagram of a W-band ultra-wideband waveguide filter of the present invention;
fig. 2 is a plan view structural diagram of a W-band ultra-wideband waveguide filter of the present invention.
Fig. 3 is a simulated waveform diagram of a W-band ultra-wideband waveguide filter of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The W-band ultra-wideband waveguide filter provided by the invention is based on the traditional coupling waveguide filter structure, changes the coupling mode, loads the capacitor on the sub-basis, enables the filter to reach 44% of relative bandwidth on the premise of low loss, and has small volume and good rectangular coefficient.
The structure of the W-band ultra-wideband waveguide filter comprises a coupling resonant cavity and a metal loading capacitor column; the input/output port of the filter is a standard rectangular waveguide WR-10, and is calculated by a Chebyshev response formula, the filter is a nine-order filter, and in order to simplify the design, an H-plane offset magnetic coupling structure is adopted, so that the structure is formed by connecting nine resonant cavities in a direct coupling and splitting mode. In order to realize ultra-wideband, high out-of-band rejection and miniaturization of the filter, a capacitive loading technology is utilized to insert metal columns with different diameters into the H-plane of each resonant cavity.
Specifically, the W-band ultra-wideband waveguide filter is based on an offset magnetic coupling structure, and a metal column is inserted into each resonant cavity to realize the aim in a mode of loading a capacitor. As shown in fig. 1-2. The broadband waveguide filter consists of 9 resonant cavities, and the chebyshev response is realized by a direct coupling mode. Wherein each cavity operates in the TE101 mode and each cavity is magnetically coupled by being offset from the coupling window of an adjacent cavity. The loading of the capacitor is realized by inserting a metal column into the H surface of each resonant cavity, wherein the radius of the metal column is r, and the length of the metal column is the length of the broadside of the resonant cavity.
In order to facilitate the subsequent simulation design and actual processing, the filter structure is bilaterally symmetrical about the 5 th resonant cavity in the middle, and the overall height of the filter is the height of a standard WR-10 rectangular waveguide port. The input/output port was set to the standard WR-10 rectangular waveguide port size (2.54 mm×1.27 mm).
The waveguide is a transmission medium with the advantages of low loss, high bandwidth, low interference and the like, and is widely applied to the radio frequency circuit design in the fields of microwaves, millimeter waves and the like. In the waveguide, electromagnetic waves are transmitted by reflection within the metal housing, so the waveguide has advantages of low loss and high bandwidth. A waveguide bandpass filter is a device that selectively transmits a specific frequency signal and suppresses other frequency signals, and is typically composed of a plurality of cascaded filter units, each of which can achieve a specific frequency response. The input/output port of the invention adopts WR-10 standard rectangular waveguide suitable for W wave band, the size of the waveguide is 2.54mm and 1.27mm, and electromagnetic waves of 70GHz-110 GHz can be effectively passed. According to the Chebyshev response function carried index, the filter is a 9-order filter, so the filter consists of 9 resonant cavities. And adjusting the offset of two adjacent resonant cavities according to the calculated coupling coefficient so that the effect of the pass band appears in the simulation waveform. The out-of-band rejection of the high-frequency band of the directly coupled waveguide filter is poor, and in order to improve the out-of-band rejection and reduce the overall size of the filter, the invention takes the directly coupled filter as a prototype, and realizes loading capacitance in a mode of inserting a metal column into the E surface of the waveguide. The effect of this capacitor is to short circuit the high frequency signal at a certain frequency, thereby achieving out-of-band rejection. In the waveguide, the effect of the metal column is equivalent to that of a capacitor, and the capacitance value of the metal column and the E surface of the waveguide can be controlled by adjusting the size and the position of the metal column, so that the out-of-band suppression effect is realized. In addition, the loading capacitor can reduce the length of the transmission line, so the metal column can also play a role in reducing the overall size of the filter.
The invention combines the offset magnetic coupling structure and the loading capacitance technology, improves the overall structure of the filter, and changes the traditional rectangular diaphragm loading capacitance into a cylindrical shape. Electromagnetic simulation is carried out in commercial electromagnetic simulation software High Frequency Structure Simulator (HFSS) to obtain simulation waveforms, as shown in fig. 3, the center frequency of the W-band ultra-wideband waveguide filter is 90GHz, the bandwidth can reach 44%, the out-of-band rejection of 60GHz is 78dB, the out-of-band rejection of 120GHz is 33dB, the return loss in the passband is more than 15dB, and the transmission coefficient is less than 0.1dB.
While the foregoing is directed to embodiments, aspects and advantages of the present invention, other and further details of the invention may be had by the foregoing description, it will be understood that the foregoing embodiments are merely exemplary of the invention, and that any changes, substitutions, alterations, etc. which may be made herein without departing from the spirit and principles of the invention.
Claims (4)
1. The W-band ultra-wideband waveguide filter comprises a cavity, wherein the front end of the cavity is provided with a downlink filter port and an uplink filter port; the filter is characterized in that the filter is a nine-order filter, the filter adopts an H-plane offset magnetic coupling structure, and an input/output port of the filter is a standard rectangular waveguide WR-10; the H-plane offset magnetic coupling structure comprises nine resonant cavities, and two adjacent resonant cavities are directly coupled in a window dislocation mode; and a capacitive loading technology is adopted to insert metal columns with different diameters into the H surface of each resonant cavity.
2. A W-band ultra-wideband waveguide filter as claimed in claim 1, wherein the filter is operative with each resonant cavity in the TE101 mode.
3. The W-band ultra-wideband waveguide filter of claim 1, wherein the resonating unit has a bilateral symmetry about the middle 5 th resonating cavity.
4. The W-band ultra-wideband waveguide filter of claim 1, wherein the diameter of the metal posts comprises: the diameter of the first metal column is r1=0.1 mm, the diameter of the second metal column is r2=0.158 mm, the diameter of the third metal column is r3=0.17 mm, the diameter of the fourth metal column is r4=0.2 mm, and the diameter of the fifth metal column is r5=0.238 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310846656.4A CN116646700A (en) | 2023-07-11 | 2023-07-11 | W-band ultra-wideband waveguide filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310846656.4A CN116646700A (en) | 2023-07-11 | 2023-07-11 | W-band ultra-wideband waveguide filter |
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| CN116646700A true CN116646700A (en) | 2023-08-25 |
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| CN202310846656.4A Pending CN116646700A (en) | 2023-07-11 | 2023-07-11 | W-band ultra-wideband waveguide filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118054183A (en) * | 2024-03-15 | 2024-05-17 | 电子科技大学 | Microstrip-ultrathin cavity filter-microstrip structure |
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2023
- 2023-07-11 CN CN202310846656.4A patent/CN116646700A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118054183A (en) * | 2024-03-15 | 2024-05-17 | 电子科技大学 | Microstrip-ultrathin cavity filter-microstrip structure |
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