CN216773483U

CN216773483U - Resonator and cavity filter

Info

Publication number: CN216773483U
Application number: CN202123333268.1U
Authority: CN
Inventors: 柯友文; 朱晖; 陶海军; 高贺彪
Original assignee: Wuhan Fingu Electronic Technology Co Ltd
Current assignee: Wuhan Fingu Electronic Technology Co Ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-06-17
Anticipated expiration: 2031-12-28

Abstract

The utility model provides a filter, includes the cavity, installs the apron on the cavity, and this cavity is for opening the form, is equipped with in the open cavity and separates the muscle, should separate the muscle and separate into a plurality of resonant cavities to the cavity, all installs the syntonizer in these resonant cavities, and two first and last syntonizer bottom electric connection have signal input port and signal output port, the syntonizer includes resonance post and installs the electric capacity board on resonance post. This cavity filter uses the syntonizer of electric capacity board with resonance post structure, compares with prior art, and this structure filter can realize the miniaturization, the modularization, and weight lightweight, and the syntonizer can be processed with multiple die stamping mode, and the processing cost is lower, and efficiency is higher, can improve product property ability, improves the product percent of pass.

Description

Resonator and cavity filter

Technical Field

The utility model relates to the technical field of communication, in particular to a resonator and a cavity filter.

Technical Field

The filter is one of indispensable devices in a wireless communication system as a communication device for frequency selection and far-end harmonic suppression, and is widely applied to the field of communication.

At present, resonators in existing filters are generally coaxial resonators, and are mounted inside cavities by screws during assembly, the resonators are large in size and large in weight, and meanwhile due to strong coupling between resonant cavities, high coupling ribs need to be added between the two resonant cavities during design, so that the implementation is difficult, and the method cannot meet design requirements of filter products with extremely small size and weight which are actually required.

Accordingly, it is desirable to design a resonator and a cavity filter to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a resonator and a cavity filter, and aims to solve the problems that the filter in the prior art is large in size, great in weight and difficult to realize.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a filter, includes the cavity, installs the apron on the cavity, and this cavity is for opening the form, is equipped with in the open cavity and separates the muscle, should separate the muscle and separate into a plurality of resonant cavities to the cavity, all installs the syntonizer in these resonant cavities, and two first and last syntonizer bottom electric connection have signal input port and signal output port, the syntonizer includes resonance post and installs the electric capacity board on resonance post.

Preferably, the cover plate is provided with a plurality of frequency modulation adjusting sheets and coupling adjusting sheets, and the distance between adjacent resonators is not less than the width of the coupling adjusting sheets.

Preferably, the cavity is further provided with a capacitive coupling sheet and a supporting seat, the capacitive coupling sheet comprises a supporting part arranged on the supporting seat, and the coupling sheet formed by bending the supporting part is positioned on two sides of the separating rib and is arranged in the resonant cavity at intervals with the resonator.

Preferably, the supporting seat is composed of two insulating blocks with grooves in the middle, the grooves are used for placing and positioning the capacitive coupling sheet, and the two insulating blocks are spliced with each other by adopting mortise and tenon structures and clamped on the separation ribs.

Preferably, the capacitor plate of the resonator is a metal thin plate, and the area of the capacitor plate is larger than that of the connecting position of the resonant column connected with the capacitor plate.

Preferably, the capacitor plate and the resonator column of the resonator are connected by welding, riveting or other forms.

Preferably, a plurality of coupling ribs are further arranged on two sides of each resonance column, and the resonance columns of adjacent resonators are connected through the coupling ribs.

Preferably, the coupling rib and the resonance column are integrally formed and then bent, and the thickness of the coupling rib is the same as that of the resonance column.

Preferably, the surface of the cavity, on which the resonator is mounted, is defined as a bottom wall, and the bottom of the resonant column is defined as a solder fillet welded on the bottom wall of the cavity.

Preferably, the signal input port and the signal output port are mounted on the bottom wall of the cavity.

Compared with the prior art, the resonator adopting the structure can miniaturize and modularize the filter, has light weight, can be processed by various die stamping modes, has lower processing cost and higher efficiency, and can improve the product performance and the product percent of pass.

Drawings

FIG. 1 is an exploded view of the cavity filter of the present invention;

FIG. 2 is a top view of the cavity filter of the present invention;

FIG. 3 is a schematic diagram of an arrangement structure of resonators in the cavity filter according to the present invention;

FIG. 4 is a schematic structural diagram of a first embodiment of a resonator of the present invention;

fig. 5 is a schematic structural diagram of a second embodiment of the resonator of the present invention;

fig. 6 is a schematic diagram of the topology of the filter of the present invention.

Detailed Description

The technical solutions in the embodiments 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 a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 5, a filter 100 includes a cavity 10, a cover plate 80 is welded on the cavity, a plurality of frequency modulation adjusting sheets 81 and coupling adjusting sheets 82 are arranged on the cover plate 80 for adjusting the frequency and coupling of the filter 100, and the frequency and coupling adjusting effects can be achieved by pressing and raising the heights of the frequency modulation adjusting sheets 81 and the coupling adjusting sheets. The cavity 10 is open, the partition ribs 20 are arranged in the open cavity 10, the partition ribs 20 partition the cavity 10 into two rows and eight resonant cavities, each resonant cavity is internally provided with a resonator 30, each resonator 30 comprises a square or cylindrical resonant column 32 and a rectangular sheet-shaped capacitor plate 31 arranged on the resonant column 32, the rectangular capacitor plate 31 and the circular or square resonant column 32 are only one embodiment of the scheme, and the shapes of the capacitor plate 31 and the resonant column 32 of the resonator of the utility model are not limited. The area of the capacitor plate 31 is larger than that of the connecting part of the resonant column 32 connected with the capacitor plate, the bottom of the resonant column 32 is provided with a welding foot 33, the welding foot 33 is welded on the bottom wall of the cavity 10, and a certain safety interval is reserved between the adjacent resonators 30 and is larger than the width of the coupling adjusting sheet 82. Defining a path in which a resonant cavity is formed by sequentially arranging a first cavity, a second cavity, a third cavity, a fourth cavity, a fifth cavity, a sixth cavity, a seventh cavity and an eighth cavity as a main coupling path, connecting the resonant columns 32 of adjacent resonators 30 on the main coupling path by coupling ribs 40, wherein the coupling ribs 40 and the resonant columns 32 have the same thickness, integrally cutting the resonant columns 32 and the coupling ribs 40 on a metal plate and bending the same during actual processing, then welding a capacitance plate 31 on the resonant columns 32, and adopting welding, riveting or other forms for the connection mode of the capacitance plate 31 and the resonant columns 32. The supporting seat 50 is installed on the spacer 20, the supporting seat 50 is composed of two insulating blocks 51 with grooves 52 in the middle, the grooves 52 are used for placing and positioning the capacitive coupling sheet 60, the two insulating blocks 51 are mutually spliced by adopting a mortise and tenon structure and clamped on the spacer 20, and in addition, the supporting seat 50 can also be integrally formed by injection molding. The capacitive coupling sheet 60 includes a support portion 61 mounted on the support base 50, and coupling sheets 62 formed by bending the support portion 61 are located at two sides of the spacer 20 and placed in the resonant cavity at an interval from the resonator 30, and the capacitive coupling sheet 60 may be of a symmetrical structure or an asymmetrical structure with the spacer 20 as an axis. Two signal transmission ports 70 are electrically connected to the bottom of the first and eighth resonators 30, and the two signal transmission ports 70 are mounted on the bottom wall of the chamber 10 for receiving and transmitting signals.

As shown in fig. 6, two capacitive coupling sheets 60 are respectively placed between the first cavity and the fourth cavity, between the second cavity and the fourth cavity, between the fifth cavity and the seventh cavity, and between the fifth cavity and the eighth cavity, and the capacitive coupling formed by the capacitive coupling sheets 60 and the inductive coupling formed by the coupling rib 40 jointly form two symmetrical flying zeros. The topology of the present invention includes, but is not limited to, one of the above forms, and may be designed as a single capacitive or inductive null or other topology.

Compared with the prior art, the resonator with the structure of the capacitor plate and the resonance column can increase step impedance, the resonance column of the resonator can be made as small as possible to increase inductance, the capacitor plate can increase the area of the capacitor with the cover plate as large as possible to increase capacitance, and accordingly resonance frequency is greatly reduced.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the utility model, which is intended to be covered by the claims and any design similar or equivalent to the scope of the utility model.

Claims

1. The utility model provides a filter, includes the cavity, installs the apron on the cavity, and this cavity is for opening the form, is equipped with in the open cavity and separates the muscle, should separate the muscle and separate into a plurality of resonant cavities to the cavity, all installs the syntonizer in a plurality of resonant cavities, and two syntonizers bottom electric connection of head and the tail have signal input port and signal output port, its characterized in that: the resonator includes a resonant column and a capacitive plate mounted over the resonant column.

2. The filter of claim 1, wherein: the cover plate is provided with a plurality of frequency modulation adjusting sheets and coupling adjusting sheets, and the distance between adjacent resonators is not smaller than the width of the coupling adjusting sheets.

3. The filter of claim 1, wherein: still install capacitive coupling piece and supporting seat in the cavity, the capacitive coupling piece including install in supporting part on the supporting seat, and the coupling piece that is formed by this supporting part is buckled is located the both sides that separate the muscle are arranged in the resonant cavity with the syntonizer interval is placed.

4. The filter of claim 3, wherein: the supporting seat is composed of two insulating blocks with grooves in the middle, the grooves are used for placing and positioning the capacitive coupling sheets, and the two insulating blocks are spliced with each other by adopting mortise and tenon structures and clamped on the separation ribs.

5. The filter of claim 1, wherein: the capacitor plate of the resonator is a metal thin plate, and the area of the capacitor plate is larger than that of the connecting position of the resonant column connected with the capacitor plate.

6. The filter of claim 5, wherein: and the capacitor plate and the resonant column of the resonator are connected by welding, riveting or other forms.

7. The filter of claim 6, wherein: and a plurality of coupling ribs are arranged on two sides of the resonance column, and the resonance columns of adjacent resonators are connected through the coupling ribs.

8. The filter of claim 7, wherein: the coupling rib and the resonance column are integrally formed and then are processed in a bending mode, and the thickness of the coupling rib is the same as that of the resonance column.

9. The filter of claim 8, wherein: the one side of installing the syntonizer in the cavity is defined as the diapire, and the bottom of resonance post is defined as the leg, and this leg welding is at the cavity diapire.

10. The filter of claim 9, wherein: and the signal input port and the signal output port are arranged on the bottom wall of the cavity.