CN214153145U

CN214153145U - Cavity filter

Info

Publication number: CN214153145U
Application number: CN202023328510.1U
Authority: CN
Inventors: 徐在玉; 王伟曳; 杨锐
Original assignee: Dongguan Ace Technologies Corp
Current assignee: Dongguan Ace Technologies Corp
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-09-07
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a cavity filter, which comprises a cavity, a cover plate, at least two resonators, a medium seat, a capacitor structure and an adjustable capacitor screw rod; the cover plate is covered on the cavity, at least two resonant cavities are formed in the cavity, and at least two resonators are respectively and correspondingly arranged on the at least two resonant cavities; the dielectric base is fixed in a cavity between two adjacent resonant cavities, the capacitor structure is mounted on the dielectric base, a first end of the capacitor structure is close to the resonator on one side of the dielectric base to form capacitive coupling and is upwards connected with the cover plate, a second end of the capacitor structure is close to the resonator on the other side of the dielectric base to form capacitive coupling, the adjustable capacitor screw is arranged on the cover plate, and the inner end of the adjustable capacitor screw extends into the cavity and is positioned right above the capacitor structure. The utility model discloses can improve the once pass rate of batch production, reduce rework and disability rate.

Description

Cavity filter

Technical Field

The utility model relates to the field of communication technology, especially, relate to a cavity filter.

Background

Aiming at the requirements of 5G communication on the volume and the weight of equipment, the filter is used as an important component of a communication system and also meets the requirements of small volume and light weight. Meanwhile, the 5G coverage frequency is wider, the carrier wave is wider, the filter frequency is required to be higher, and the bandwidth is wider than that of 4G. The requirement leads to the whole volume of wave filter to shrink like this, and the size such as syntonizer reduces greatly, also is more and more high to each part precision requirement of product for traditional capacitive coupling mode can not satisfy batch production operation requirement. And the size is smaller and smaller, so that the requirement on the size of the capacitor cross coupling is high, the requirement on the position precision and the tolerance of the installation position tool is higher, and the product one-time pass rate, the rework rate and the rejection rate are greatly increased by the conventional scheme at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cavity filter can improve the product one-time pass rate, reduces rework rate and disability rate.

In order to achieve the above object, the present invention provides a cavity filter, which comprises a cavity, a cover plate, at least two resonators, a dielectric base, a capacitor structure and an adjustable capacitor screw; the cover plate is covered on the cavity, at least two resonant cavities are formed in the cavity, and at least two resonators are respectively and correspondingly arranged on the at least two resonant cavities; the dielectric base is fixed in a cavity between two adjacent resonant cavities, the capacitor structure is mounted on the dielectric base, a first end of the capacitor structure is close to the resonator on one side of the dielectric base to form capacitive coupling and is upwards connected with the cover plate, a second end of the capacitor structure is close to the resonator on the other side of the dielectric base to form capacitive coupling, the adjustable capacitor screw is arranged on the cover plate, and the inner end of the adjustable capacitor screw extends into the cavity and is positioned right above the capacitor structure.

Optionally, the second end of the capacitor structure forms a surrounding structure, one side of which surrounds the corresponding resonator.

Optionally, the surrounding structure is U-shaped, V-shaped or circular arc-shaped.

Optionally, the first end of the capacitor structure is connected to the cover plate by means of nut locking, welding or clinching.

Optionally, the cover plate is provided with a communication hole corresponding to the first end of the capacitor structure, and the first end of the capacitor structure is conductively connected with the communication hole in a nut locking, welding or riveting manner.

Optionally, the capacitor structure is a metal sheet, a PCB, or a silver-plated metal wire.

Optionally, the upper end of the medium seat is fixedly connected to the inner wall of the cover plate, an opening penetrating upwards is formed in the middle of the medium seat, the inner end of the adjustable capacitor screw extends into the opening, and the capacitor structure portion is located right below the opening and close to the opening.

Optionally, the media holder is made of polytetrafluoroethylene.

Optionally, the adjustable capacitor screw is mounted on the cover plate by means of press riveting or screw connection.

Optionally, the cover plate is fixedly connected with the cavity in a screw fastening or welding manner.

Compared with the prior art, the utility model discloses a set up electric capacity structure and cooperation and utilize adjustable electric capacity screw rod, can realize the adjustable of electric capacity, improve the once-through rate of batch production, reduce rework and disability rate to adjustable the index of letting realizes becoming more nimble, can reduce the machining precision of other supporting materials, and can compensate the bad problem of product that machining error leads to.

Drawings

Fig. 1 is a schematic diagram of a cross-sectional structure of the cavity filter of the present invention.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

Referring to fig. 1 and 2, the present invention discloses a cavity filter, which includes a cavity 1, a cover plate 2, at least two resonators 3, a dielectric base 4, a capacitor structure 5 and an adjustable capacitor screw 6; the cover plate 2 is covered on the cavity 1, at least two resonant cavities 20 are formed in the cavity 1, and the at least two resonators 3 are respectively and correspondingly arranged on the at least two resonant cavities 20; the medium base 4 is fixed in a cavity 21 between two adjacent resonant cavities 20, the capacitor structure 5 is installed on the medium base 4, a first end of the capacitor structure 5 is close to the resonator 3 on one side of the medium base 4 to form capacitive coupling and is upwards connected with the cover plate 2, a second end of the capacitor structure 5 is close to the resonator 3 on the other side of the medium base 4 to form capacitive coupling, the adjustable capacitor screw 6 is arranged on the cover plate 2, and the inner end of the adjustable capacitor screw 6 extends into the cavity 21 and is located right above the capacitor structure 5.

The utility model discloses a set up electric capacity structure 5 and the cooperation utilizes adjustable electric capacity screw rod 6, can realize the adjustable of electric capacity, improve the once-through rate of batch production, reduce rework and disability rate to adjustable the index realization of letting becomes more nimble, can reduce the machining precision of other supporting materials, and can compensate the bad problem of product that machining error leads to.

In some embodiments, the second end of the capacitive structure 5 forms a surrounding structure 50, one side of the surrounding structure 50 surrounding the corresponding resonator 3.

Specifically, the enclosure 50 is U-shaped, V-shaped, circular arc-shaped, or other similar open structure.

In some embodiments, the first end of the capacitor structure 5 is fastened, welded or clinched to the cover plate 2 by a nut.

Specifically, the cover plate 2 is provided with a communication hole 22 corresponding to the first end of the capacitor structure 5, and the first end of the capacitor structure 5 is conductively connected to the communication hole 22 through a nut locking, welding or press riveting.

In the present invention, the capacitor structure 5 may be a metal sheet, a PCB, a silver-plated metal wire or other conductor. The utility model discloses do not limit to this.

In some embodiments, the upper end of the dielectric holder 4 is fixedly connected to the inner wall of the cover plate 2, the middle of the dielectric holder 4 forms an opening 40 extending upward, the inner end of the adjustable capacitor screw 6 extends into the opening 40 and is adjusted in position in the opening 40, and the capacitor structure 5 is partially located right below the opening 40 and close to the opening 40. Through the design, not only the stable installation of the medium seat 4 is convenient to realize, but also the contact between the adjustable capacitor screw 6 and the capacitor structure 5 can be avoided.

In some embodiments, the media holder 4 is a polytetrafluoroethylene material. But is not limited thereto.

In some embodiments, the adjustable capacitance screw 6 is mounted on the cover plate 2 by means of clinching or screwing. But is not limited thereto.

In some embodiments, the cover plate 2 is fixedly connected with the cavity 1 by means of screw fastening or welding. But is not limited thereto.

The following takes the cavity filter in the specific example shown in fig. 1 and fig. 2 as an example to briefly describe the working principle:

when the adjustable capacitor screw 6 is used, the adjustable capacitor screw 6 extends into the opening 40 with different depths, and the capacitance can be adjusted due to different changes of the simulation cross coupling value. As shown in the following table:

experimental data	Adjustable capacitance screw depth	Cross coupling value of resonant cavity capacitance
			1st	0mm	-33.5
2nd	2mm	-20.5
			3rd	3mm	-10.7
4th	5mm	-6.6

The above disclosure is only a preferred embodiment of the present invention, and the scope of the claims of the present invention should not be limited thereby, and all the equivalent changes made in the claims of the present invention are intended to be covered by the present invention.

Claims

1. A cavity filter is characterized by comprising a cavity, a cover plate, at least two resonators, a medium seat, a capacitor structure and an adjustable capacitor screw rod; the cover plate is covered on the cavity, at least two resonant cavities are formed in the cavity, and at least two resonators are respectively and correspondingly arranged on the at least two resonant cavities; the dielectric base is fixed in a cavity between two adjacent resonant cavities, the capacitor structure is mounted on the dielectric base, a first end of the capacitor structure is close to the resonator on one side of the dielectric base to form capacitive coupling and is upwards connected with the cover plate, a second end of the capacitor structure is close to the resonator on the other side of the dielectric base to form capacitive coupling, the adjustable capacitor screw is arranged on the cover plate, and the inner end of the adjustable capacitor screw extends into the cavity and is positioned right above the capacitor structure.

2. The cavity filter of claim 1, wherein the second end of the capacitive structure forms a surrounding structure, one side of the surrounding structure surrounding the corresponding resonator.

3. The cavity filter of claim 2, wherein the surround structure is U-shaped, V-shaped, or arc-shaped.

4. The cavity filter of claim 1, wherein the first end of the capacitor structure is fastened, welded, or clinched to the cover plate by a nut.

5. The cavity filter of claim 4, wherein the cover plate is provided with a communication hole corresponding to the first end of the capacitor structure, and the first end of the capacitor structure is conductively connected to the communication hole by nut locking, welding or riveting.

6. The cavity filter of claim 1, wherein the capacitive structure is a metal sheet, a PCB, or silver plated metal wire.

7. The cavity filter of claim 1, wherein the upper end of the dielectric holder is fixedly connected to the inner wall of the cover plate, an opening penetrating upward is formed in the middle of the dielectric holder, the inner end of the adjustable capacitor screw extends into the opening, and the capacitor structure is partially located right below the opening and close to the opening.

8. The cavity filter of claim 1, wherein the dielectric holder is made of teflon.

9. The cavity filter of claim 1, wherein the adjustable capacitance screw is mounted on the cover plate by means of clinching or screwing.

10. The cavity filter of claim 1, wherein the cover plate is fixedly connected to the cavity by means of screw fastening or welding.