CN210576356U - Frequency-adjustable cavity filter - Google Patents
Frequency-adjustable cavity filter Download PDFInfo
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- CN210576356U CN210576356U CN201921820858.7U CN201921820858U CN210576356U CN 210576356 U CN210576356 U CN 210576356U CN 201921820858 U CN201921820858 U CN 201921820858U CN 210576356 U CN210576356 U CN 210576356U
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Abstract
The utility model discloses a frequency adjustable cavity filter relates to communication equipment technical field. The cavity filter comprises a cover plate, a filter cavity, a tuning screw rod, a coupling screw rod and a tap, wherein the filter cavity comprises at least three resonant cavities which are sequentially connected and arranged at intervals, and a resonant rod arranged in each resonant cavity; the coupling windows are arranged at the intervals of the adjacent resonant cavities, the tuning screw rods are arranged corresponding to the resonant rods, the coupling screw rods are arranged corresponding to the coupling windows, the capacitance C is adjusted by adjusting the relative distance between the tuning screw rods and the resonant rods, and the coupling strength is finely adjusted by the coupling screw rods, so that the frequency of the cavity filter in a certain frequency band is adjusted, the design requirement of the coupling strength is met, and a plurality of cavity filters are not required to be designed in a certain frequency band to meet the use requirement.
Description
Technical Field
The utility model belongs to the technical field of communication equipment, especially, relate to a frequency adjustable cavity filter.
Background
With the continuous development of communication technology and the development and high-speed progress of modern microwave communication means, the requirements on the filter in the aspects of microwave communication, microwave navigation, satellite communication, military electronic war and the like are higher and higher, and under the condition that the current world frequency spectrum resources become more precious and crowded, the flexible and reasonable utilization of frequency band resources is extremely important, so that certain requirements are provided for the applicable frequency of the filter. Compared with flexible application of a microstrip filter, an LC filter and the like in frequency, the cavity filter has certain advantages, and compared with other filters, the cavity filter has the advantages of firm structure, stable and reliable performance, high Q value, large power capacity, far parasitic pass band and good heat dissipation performance, and has very high research value.
At present, the center frequency of the cavity filter is usually fixed, for example, patent document with publication number CN208753483U, entitled cavity filter, in which a cavity filter is disclosed, each resonant rod is an independent resonator, a coupling window is formed between adjacent resonators, and the center frequency of the cavity filter is determined after the product structure is determined. If different frequencies in a certain frequency band are aimed at, several cavity filters need to be designed to meet the requirements, and the design cost and the design time are increased.
SUMMERY OF THE UTILITY MODEL
Fixed problem that leads to application frequency range little to cavity filter central frequency among the prior art, the utility model provides a frequency adjustable cavity filter realizes that central frequency is adjustable in certain frequency channel through tuning screw and coupling screw to adapt to a plurality of different frequencies, application scope is wide, need not to design a plurality of cavity filters, reduces design cost and design time.
The utility model discloses a solve above-mentioned technical problem through following technical scheme: a frequency-adjustable cavity filter comprises a cover plate, a filter cavity, a tuning screw, a coupling screw and a tap; the filter cavity comprises at least three resonant cavities which are sequentially connected and arranged at intervals, and a resonant rod arranged in each resonant cavity; a coupling window is arranged at the interval between every two adjacent resonant cavities, and a partition plate is arranged at the interval between the first resonant cavity and the last resonant cavity to completely isolate the first resonant cavity from the last resonant cavity;
the cover plate is arranged on the filter cavity to completely seal the filter cavity; a tuning threaded hole is formed in the cover plate corresponding to the resonance rod, and a coupling threaded hole is formed in the cover plate corresponding to the coupling window; the tuning screw penetrates through the tuning nut and the tuning threaded hole and is screwed in or out of the resonance rod to realize tuning, and the coupling screw penetrates through the coupling nut and the coupling threaded hole and is screwed in or out of the coupling window to realize fine tuning of coupling strength;
the taps include a first tap coupled with a first resonant cavity and a second tap coupled with a last resonant cavity.
The utility model discloses a cavity filter is equipped with the resonance bar (being equivalent to inductance L) in every resonant cavity is internal, deuterogamies the regulation tuning screw rod to adjust the relative distance between tuning screw rod and the resonance bar, be equivalent to electric capacity C's regulation, thereby realized the regulation of cavity filter frequency, realize the fine setting of coupling intensity through the coupling screw rod, with the error that produces in the compensation filter cavity structure course of working, satisfy the designing requirement of coupling intensity.
Furthermore, the U-shaped groove is formed in the upper surface of the cover plate, so that the tuning screw, the tuning nut, the coupling screw and the coupling nut are located in the U-shaped groove, and the phenomenon that the central frequency of the cavity filter is changed due to the fact that external force touches the tuning screw and the coupling nut is avoided.
Further, the cover plate is fixed on the filter cavity through countersunk screws.
Further, the filter cavity comprises four resonant cavities, and the four resonant cavities are respectively a first resonant cavity, a second resonant cavity, a third resonant cavity and a fourth resonant cavity; the first resonant cavity and the second resonant cavity are provided with a first coupling window at the interval, the second resonant cavity and the third resonant cavity are provided with a second coupling window at the interval, the third resonant cavity and the fourth resonant cavity are provided with a third coupling window at the interval, and the first resonant cavity and the fourth resonant cavity are provided with the partition plate at the interval.
The four-cavity filter is designed for the frequency band of 9.3 GHz-9.5 GHz in the X wave band.
Further, the heights of the first coupling window and the third coupling window are equal.
Further, the height of the first and third coupling windows is 4.7 mm; the height of the second coupling window is 5.6 mm.
Further, the height of the resonance rod is 5.33mm, and the diameter is 4.1 mm.
Furthermore, the length, width and height of the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are all 10mm × 10mm × 8 mm.
Advantageous effects
Compared with the prior art, the utility model provides a frequency-adjustable cavity filter, which comprises a cover plate, a filter cavity, a tuning screw, a coupling screw and a tap, wherein the filter cavity comprises at least three resonant cavities which are sequentially connected and arranged at intervals, and a resonant rod arranged in each resonant cavity; the coupling windows are arranged at the intervals of the adjacent resonant cavities, the tuning screw rods are arranged corresponding to the resonant rods, the coupling screw rods are arranged corresponding to the coupling windows, the capacitance C is adjusted by adjusting the relative distance between the tuning screw rods and the resonant rods, and the coupling strength is finely adjusted by the coupling screw rods, so that the frequency of the cavity filter is adjusted in a certain frequency band, the design requirement of the coupling strength is met, and a plurality of cavity filters are not required to be designed in a certain frequency band to meet the use requirement; the cavity filter is simple in structure, simple in frequency adjustment operation and wide in application range.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a three-dimensional structure diagram of the cavity filter in the embodiment of the present invention;
fig. 2 is a split view of the cavity filter according to the embodiment of the present invention;
FIG. 3 is a waveform diagram of the embodiment of the present invention with a center frequency of 9.3 GHz;
fig. 4 is a waveform diagram with a center frequency of 9.4GHz in the embodiment of the present invention;
FIG. 5 is a waveform diagram of the embodiment of the present invention with a center frequency of 9.5 GHz;
the filter comprises a filter cavity 1, a cover plate 2, a tuning screw 3, a coupling screw 4, a tuning nut 5, a coupling nut 6, a first resonant cavity 7, a second resonant cavity 8, a third resonant cavity 9, a fourth resonant cavity 10, a resonant rod 11, a first coupling window 12, a second coupling window 13, a third coupling window 14, a countersunk head screw 15, a radio frequency connector 16, a combined screw 17, a U-shaped groove 18, a partition plate 19, a first tap 20 and a second tap 21.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 and 2, taking the 9.3 GHz-9.5 GHz band in the X band as an example, the utility model provides a frequency-adjustable cavity filter, which comprises a cover plate 2, a filter cavity 1, four tuning screws 3, three coupling screws 4 and two taps 20, wherein the filter cavity 1 comprises four resonant cavities connected in sequence and arranged at intervals, and four resonant rods 11 respectively arranged in the four resonant cavities; the four resonant cavities are respectively a first resonant cavity 7, a second resonant cavity 8, a third resonant cavity 9 and a fourth resonant cavity 10; a first coupling window 12 is arranged at the interval between the first resonant cavity 7 and the second resonant cavity 8, a second coupling window 13 is arranged at the interval between the second resonant cavity 8 and the third resonant cavity 9, a third coupling window 14 is arranged at the interval between the third resonant cavity 9 and the fourth resonant cavity 10, a partition plate 19 is arranged at the interval between the first resonant cavity 7 and the fourth resonant cavity 10, and when the cover plate 2 is installed, the partition plate 19 completely isolates the first resonant cavity 7 from the fourth resonant cavity 10.
The cover plate 2 is arranged on the filter cavity 1 through a countersunk screw 15, so that the filter cavity 1 is completely sealed; tuning threaded holes are formed in the cover plate 2 corresponding to each resonance rod 11, and coupling threaded holes are formed in the cover plate 2 corresponding to the first coupling window 12, the second coupling window 13 and the third coupling window 14; the four tuning screws 3 respectively penetrate through the corresponding tuning nuts 5 and the corresponding tuning threaded holes to be screwed in or out of the four resonance rods 11 to realize tuning, and the three coupling screws 4 respectively penetrate through the corresponding coupling nuts 6 and the corresponding coupling threaded holes to be screwed in or out of the first coupling window 12, the second coupling window 13 and the third coupling window 14 to realize fine tuning of coupling strength. Each resonant cavity corresponds to one resonant rod, each resonant rod corresponds to one tuning screw, and each coupling window corresponds to one coupling screw.
The taps comprise a first tap 20 and a second tap 21, the first tap 20 is coupled with the first resonant cavity 7, the second tap 21 is coupled with the fourth resonant cavity 10, the first tap 20 and the second tap 21 are respectively butted with two radio frequency connectors 16, and the radio frequency connectors 16 are used for the communication connection of the cavity filter and external equipment. The radio frequency connectors 16 are mounted on both sides of the filter cavity 1 by means of combination screws 17.
The U-shaped groove 18 is formed in the upper surface of the cover plate 2 provided with the tuning threaded hole and the coupling threaded hole, so that the tuning screw 3, the tuning nut 5, the coupling screw 4 and the coupling nut 6 are located in the U-shaped groove 18, and the phenomenon that the center frequency of the cavity filter is changed due to the fact that external force touches the tuning screw and the nut is avoided. In this embodiment, the depth of the U-shaped groove 18 is 2mm, and the thickness of the cover plate 2 is 4.5 mm.
The heights of the first coupling window 12, the second coupling window 13 and the third coupling window 14 are determined according to the coupling strength of the HFSS software electromagnetic simulation. In this embodiment, the filter cavity 1 has a bilateral symmetry structure, the first resonant cavity 7 is symmetrical to the fourth resonant cavity 10, the second resonant cavity 8 is symmetrical to the third resonant cavity 9, the first coupling window 12 is symmetrical to the third coupling window 14, the four resonant cavities have the same length, width and height, and the four resonant rods 11 have the same height and diameter. The length, width and height of the first coupling window 12 and the third coupling window 14 are both 6mm × 2.5mm × 4.7mm, the length, width and height of the second coupling window 13 are 6mm × 2.5mm × 5.6mm, the length, width and height of the four resonant cavities are both 10mm × 10mm × 8mm, the chamfer diameter of the four resonant cavities is 2mm (due to the reason of processing tools, four corners of each resonant cavity are chamfered), and the height and diameter of the four resonant rods 11 are both 5.33mm × 4.1 mm.
In the embodiment, the filter cavity 1 and the cover plate 2 are both made of aluminum alloy with the reference number of 6061, the four tuning screws 3 and the three coupling screws 4 are all M1.6 screws meeting the GB/T15389-1994 standard, and the tuning nut 5 and the coupling nut 6 are all type 1M 1.6 nuts meeting the GB/T6170-2015 standard.
The utility model discloses a cavity filter, the resonance bar in every resonant cavity, this resonant cavity and the tuning screw rod that corresponds with this resonance bar constitute a syntonizer, and cavity filter is in fact by the wave filter that LC wave filter equivalence is derived, and cavity filter's central frequency f is with the relational expression of electric capacity inductance:
. The resonant rod is equivalent to an inductor L, the structure of the cavity filter is determined according to designed loss and bandwidth, and the resonant rod is determined after the structure is determined, so that the inductor L is fixed and unchanged, the capacitor C can only be changed when the central frequency of the cavity filter is changed, the relative distance between the tuning screw rod and the resonant rod is equivalent to the capacitor C, and the relative distance between the tuning screw rod and the resonant rod is equivalent to the capacitor C because the inductor L is fixed and unchanged, and the central frequency of
S is the relative area of the tuning screw and the resonance rod and is a constant value, d is the relative area of the tuning screw and the resonance rodThe relative distance of the rod is an air dielectric constant, and the relative distance between the tuning screw and the resonance rod is changed by screwing or unscrewing the tuning screw in the tuning nut and the tuning threaded hole, so that the size of the capacitor C is adjusted, the larger the relative distance between the resonance rod and the tuning screw is, the smaller the capacitor C is, the larger the center frequency is, the smaller the relative distance between the resonance rod and the tuning screw is, the larger the capacitor C is, and the smaller the center frequency is. In the adjusting process of the tuning screws, the screwing-in length or the screwing-out length of the four tuning screws is consistent; because there is a machining error in the filter cavity structure in the course of working, therefore, need finely tune the coupling screw rod, compensate the machining error, meet the coupling strength of the design requirement.
As shown in fig. 3 to 5, the cavity filter in the present embodiment is used to realize waveforms having center frequencies of 9.3GHz, 9.4GHz, and 9.5GHz by adjusting the tuning screw and the coupling screw, S21 represents a loss curve of the cavity filter, S11 represents a standing wave reflection curve of one of the rf connectors, and S22 represents a standing wave reflection curve of the other rf connector. It can be known through fig. 3-5 that the utility model discloses a cavity filter can realize that 9.3GHz ~ 9.5GHz frequency channel internal center frequency is adjustable, and it is narrow to know the bandwidth from S21 'S graph simultaneously, and the loss is little, and it is little to fluctuate in the passband, and the Q value is high (the passband is outer than comparatively precipitous), and it is good (the matching degree is high) to know the standing wave from S11 and S22' S graph.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or modifications within the technical scope of the present invention, and all should be covered by the scope of the present invention.
Claims (8)
1. A frequency-adjustable cavity filter is characterized by comprising a cover plate (2), a filter cavity (1), a tuning screw (3), a coupling screw (4) and a tap (20); the filter cavity (1) comprises at least three resonant cavities which are sequentially connected and arranged at intervals, and a resonant rod (11) arranged in each resonant cavity; a coupling window is arranged at the interval between every two adjacent resonant cavities, and a partition plate (19) is arranged at the interval between the first resonant cavity and the last resonant cavity to completely isolate the first resonant cavity from the last resonant cavity;
the cover plate (2) is arranged on the filter cavity (1) to completely seal the filter cavity (1); a tuning threaded hole is formed in the cover plate (2) corresponding to the resonance rod (11), and a coupling threaded hole is formed in the cover plate (2) corresponding to the coupling window; the tuning screw (3) penetrates through a tuning nut (5) and a tuning thread hole to be screwed into or out of the resonance rod (11) to realize tuning, and the coupling screw (4) penetrates through a coupling nut (6) and a coupling thread hole to be screwed into or out of the coupling window to realize fine tuning of coupling strength;
the taps include a first tap (20) and a second tap (21), the first tap (20) being coupled with a first resonant cavity and the second tap (21) being coupled with a last resonant cavity.
2. The cavity filter according to claim 1, wherein the cover plate (2) is provided with a U-shaped groove (18) on its upper surface.
3. The cavity filter according to claim 1, wherein the cover plate (2) is fixed to the filter cavity (1) by means of countersunk screws (15).
4. The cavity filter according to claim 1, wherein the filter cavity (1) comprises four resonator cavities, the four resonator cavities being a first resonator cavity (7), a second resonator cavity (8), a third resonator cavity (9) and a fourth resonator cavity (10), respectively; the first resonant cavity (7) is provided with a first coupling window (12) at a position spaced from the second resonant cavity (8), the second resonant cavity (8) is provided with a second coupling window (13) at a position spaced from the third resonant cavity (9), the third resonant cavity (9) is provided with a third coupling window (14) at a position spaced from the fourth resonant cavity (10), and the first resonant cavity (7) is provided with a partition plate (19) at a position spaced from the fourth resonant cavity (10).
5. The cavity filter according to claim 4, wherein the first coupling window (12) and the third coupling window (14) are of equal height.
6. The cavity filter according to claim 4, wherein the height of the first and third coupling windows (12, 14) is 4.7 mm; the height of the second coupling window (13) is 5.6 mm.
7. The cavity filter according to claim 4, wherein the resonant rod (11) has a height of 5.33mm and a diameter of 4.1 mm.
8. The cavity filter according to claim 4, wherein the first resonator cavity (7), the second resonator cavity (8), the third resonator cavity (9) and the fourth resonator cavity (10) each have a length, a width and a height of 10mm x 8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921820858.7U CN210576356U (en) | 2019-10-28 | 2019-10-28 | Frequency-adjustable cavity filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921820858.7U CN210576356U (en) | 2019-10-28 | 2019-10-28 | Frequency-adjustable cavity filter |
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| CN210576356U true CN210576356U (en) | 2020-05-19 |
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| CN201921820858.7U Active CN210576356U (en) | 2019-10-28 | 2019-10-28 | Frequency-adjustable cavity filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884614A (en) * | 2020-08-24 | 2020-11-03 | 武汉博畅通信设备有限责任公司 | 108-plus 270MHz frequency hopping filter |
| CN115498382A (en) * | 2022-09-27 | 2022-12-20 | 武汉凡谷电子技术股份有限公司 | Filter |
-
2019
- 2019-10-28 CN CN201921820858.7U patent/CN210576356U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884614A (en) * | 2020-08-24 | 2020-11-03 | 武汉博畅通信设备有限责任公司 | 108-plus 270MHz frequency hopping filter |
| CN115498382A (en) * | 2022-09-27 | 2022-12-20 | 武汉凡谷电子技术股份有限公司 | Filter |
| CN115498382B (en) * | 2022-09-27 | 2023-07-14 | 武汉凡谷电子技术股份有限公司 | Filter |
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Address after: 312035 Floor 1, Workshop 2, No. 1417, Renmin East Road, Fubu Street, Yuecheng District, Shaoxing City, Zhejiang Province Patentee after: Zhejiang Yitong Huasheng Technology Co.,Ltd. Address before: 3 / F, building 5, Xinggong Science Park, 100 Luyun Road, Changsha hi tech Development Zone, Hunan 410000 Patentee before: HUNAN EASTONE WASHON TECHNOLOGY Co.,Ltd. |