CN110247142B

CN110247142B - Filter

Info

Publication number: CN110247142B
Application number: CN201910566931.0A
Authority: CN
Inventors: 王世伟; 谢杰恩; 袁芊芊; 周克宇; 陈瑞森; 郭建珲; 陈国文; 胡雄敏
Original assignee: Shenzhen University
Current assignee: Shenzhen University
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2021-05-18
Anticipated expiration: 2039-06-27
Also published as: CN110247142A

Abstract

The invention relates to a filter, which comprises a shell, a first tubular object, a resonator and a second tubular object, wherein the shell comprises a bottom plate, a side plate and a cover plate, and the cover plate is provided with a through hole. Changing the volume of the liquid in the first tube changes the dielectric constant in the first tube, thus changing the equivalent wavelength in the filter and adjusting the resonance frequency in the filter; by changing the volume of liquid in the second tube, the dielectric constant in the second tube is changed, and therefore the coupling strength in the filter is changed, thereby separating the resonance frequency in the filter, so that the filter keeps the fractional bandwidth unchanged when the resonance frequency is changed. By adjusting the resonant frequency in the filter, the filter can be applied to different scenes, and therefore the applicability of the filter is improved.

Description

Filter

Technical Field

The invention relates to the field of electronic components, in particular to a filter.

Background

A microwave filter is a device for separating different microwave frequencies, which can suppress unwanted frequency signals and pass only wanted frequency signals, and plays a very important role in a transmitting end and a receiving end of a communication system. Once the conventional microwave filter is processed, the passband (frequency range through which the filter can pass) of the microwave filter is also fixed, which results in poor applicability of the conventional microwave filter.

Disclosure of Invention

The invention mainly aims to provide a filter, and aims to solve the technical problem that the filter in the prior art is poor in applicability.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a filter, comprising: the shell is of a hollow structure and comprises a bottom plate, a side plate and a cover plate, wherein the side plate is fixed on the bottom plate, the cover plate is fixed on the side plate, and the cover plate is provided with a through hole; a first tube secured to the base plate; a resonator located on a first tubular; a second tube sealed at one end, the second tube passing through the through hole and having the sealed end on the bottom plate.

The filter further comprises a probe, a first through hole is formed in the bottom plate, and the probe penetrates through the first through hole and is connected with the resonator.

Wherein the probe is a differential probe.

The filter further comprises a first connecting piece, the first connecting piece is fixedly connected with the resonator, and the probe is fixedly connected with the first connecting piece.

The filter further comprises a second connecting piece and a supporting piece, the second connecting piece is fixedly connected with the resonator, and the second connecting piece is fixed on the bottom plate through the supporting piece.

The first tubular object is of an L-shaped structure, the side plate is provided with a notch matched with the first tubular object, and the two ends of the first tubular object are clamped through the notch in the side plate, so that the first tubular object is fixed on the bottom plate.

The number of the first tubular objects and the number of the resonators are two, wherein one of the first tubular objects and the resonators are located on one side of the bottom plate, and the other of the first tubular objects and the resonators are located on the other side of the bottom plate.

Wherein the housing is made of a metal material.

Wherein the first and second tubes are made of a plastic material.

Wherein one end of the second tube is sealed by hot melt adhesive.

The invention has the beneficial effects that: changing the volume of the liquid in the first tube changes the dielectric constant in the first tube, thus changing the equivalent wavelength in the filter and adjusting the resonance frequency in the filter; by changing the volume of liquid in the second tube, the dielectric constant in the second tube is changed, and therefore the coupling strength in the filter is changed, thereby separating the resonance frequency in the filter, so that the filter keeps the fractional bandwidth unchanged when the resonance frequency is changed. By adjusting the resonant frequency in the filter, the filter can be applied to different scenes, and therefore the applicability of the filter is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of a filter according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a filter according to one embodiment of the invention.

Fig. 3 is a diagram of the effect of a filter according to one embodiment of the invention.

1. A base plate; 2. a side plate; 3. a cover plate; 4. a second tubular; 5. a first tubular; 61. a second connecting sheet; 62. a first connecting piece; 63. a resonator; 7. a support member; 8. a probe.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent 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.

Fig. 1 is a schematic perspective view of a filter according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of a filter according to one embodiment of the invention.

As can be seen from the figure, the filter may have a housing, a first tubular object 5, a resonator 63, and a second tubular object 4, where the housing is a hollow structure, the housing includes a bottom plate 1, a side plate 2, and a cover plate 3, the side plate 2 is fixed on the bottom plate 1, the cover plate 3 is fixed on the side plate 2, and the cover plate 3 is provided with a first through hole; the first tube 5 is fixed on the bottom plate 1; the resonator 63 is located on the first tubular 5; one end of the second tube 4 is sealed, and the second tube 4 passes through the first through hole and has one sealed end located on the bottom plate 1.

In this embodiment, by changing the volume of the liquid in the first tube 5, the dielectric constant in the first tube 5 is changed, and therefore the equivalent wavelength in the filter is changed, thereby adjusting the resonant frequency in the filter; by changing the volume of liquid in the second tube 4 the dielectric constant in the second tube 4 is changed, thus causing the coupling strength in the filter to change, thereby separating the resonance frequencies in the filter such that the filter maintains a fractional bandwidth with a change in the resonance frequency. By adjusting the resonant frequency in the filter, the filter can be applied to different scenes, and therefore the applicability of the filter is improved.

In this embodiment, the housing is made of a metal material, such as copper, iron, aluminum, or an alloy.

In this embodiment, the bottom plate 1 is provided with a first through hole and a second through hole, and the number of the first through hole and the number of the second through hole are both two. One of the first through holes and the second through holes is located on one side of the bottom plate 1, and the other of the first through holes and the second through holes is located on the other side of the bottom plate 1.

In one embodiment, the filter may have a first connection pad 62 and a second connection pad 61, and the first connection pad 62 and the second connection pad 61 are fixed to both sides of the resonator 63, respectively. In the present embodiment, the first connection piece 62 and the second connection piece 61 are fixed to both sides of the resonator 63 by welding, respectively. It will be appreciated that in alternative embodiments, the first and

second connection tabs

62, 61 may be secured to the resonator 63 on either side in other manners, such as by screwing, snapping, bonding, etc.

In the present embodiment, the first connecting piece 62 and the second connecting piece 61 are made of a metal material, such as copper, iron, aluminum, or an alloy.

In one embodiment, the filter may have a support 7, the support 7 and the first connection tab 62 being fixedly connected. In the present embodiment, the first connecting piece 62 is fixed to the support 7 by welding. It will be appreciated that in alternative embodiments, the first connecting piece 62 may be fixed to the support member 7 in other ways, such as by screwing, clipping, bonding, etc.

In the present embodiment, the support member 7 is provided with a screw hole, the support member 7 is passed through the first through hole from the inner side of the base plate 1, and the support member 7 is fixed to the base plate 1 by screwing a screw into the screw hole at the outer side of the base plate 1.

In one embodiment, the filter can have a probe 8, the probe 8 passing through the second through hole from the outside of the base plate 1 and having one end fixedly connected to the second connection piece 61. In this embodiment, one side of the probe 8 and the second connecting piece 61 are fixedly connected by welding. It will be appreciated that in alternative embodiments, one end of the probe 8 may be fixedly connected to the second connecting piece 61 in other manners, such as screwing, clipping, bonding, etc. The other end of the probe 8 is connected with the oscilloscope, and the probe 8 is used for collecting the resonance frequency signal in the filter and displaying the resonance frequency signal through the oscilloscope, so that the aim of accurate adjustment is fulfilled.

In an alternative embodiment, the probe 8 may be externally connected to the second connecting piece 61.

In the present embodiment, the probe 8 is a differential probe 8. The differential probe 8 has the advantages of high measurement precision, easy use, high performance and the like.

In this embodiment, the first tube 5 is an L-shaped structure, the first tube 5 is disposed on the bottom plate 1 and located under the resonator 63, two ends of the first tube 5 respectively protrude from an edge of the bottom plate 1, two notches adapted to the first tube 5 are disposed on the side plate 2, the side plate 2 is fixed on the bottom plate 1 by screws, and meanwhile, the notches on the side plate 2 tightly clamp two ends of the first tube 5, so as to fix the first tube 5 on the bottom plate 1.

In one embodiment, the second tube 4 is in a straight configuration and one end of the second tube 4 is sealed. In this embodiment, the second tube 4 is sealed by means of hot melt glue. It will be appreciated that in alternative embodiments the second tube 4 may also be sealed by a sealing plug or plate.

In this embodiment, a through hole is formed in the center of the cover plate 3, the cover plate 3 is fixed to the side plate 2 by a screw, and the second tube 4 passes through the through hole and has one sealed end located on the bottom plate 1.

In the present embodiment, the first tube 5 and said second tube 4 are made of plastic material.

In the present embodiment, the number of the first tubular object 5, the resonator 63, the probe 8, the first connecting sheet 62, the second connecting sheet 61, and the support 7 is two, wherein one of the first tubular object 5, the resonator 63, the probe 8, the first connecting sheet 62, the second connecting sheet 61, and the support 7 is divided into a first group and located on one side of the base plate 1, the other one of the first tubular object 5, the resonator 63, the probe 8, the first connecting sheet 62, the second connecting sheet 61, and the support 7 is divided into a second group and located on the other side of the base plate 1, and the two probes 8 and the two supports 7 correspond to the two first through holes and the two second through holes respectively.

The assembling process comprises the following steps:

the first connection piece 62 and the second connection piece 61 are respectively welded to both sides of the resonator 63, and then the support 7 and the first connection portion are welded together, and the support 7 is inserted through the first through hole and fixed by a screw. The first tube 5 is then placed under the resonator 63 and the probe 8 is then passed through the second through hole and welded to the second connecting piece 61. The side plate 2 is fixed on the bottom plate 1 through screws, the first tubular object 5 is fixed on the bottom plate 1 through a notch on the side plate 2, and the cover plate 3 is fixed on the side plate 2 through screws. Finally, the second tube 4 is passed through the through hole and has one end sealed on the bottom plate 1.

The working principle is as follows:

the other end of the probe 8 is connected to an oscilloscope to generate a resonance frequency of the resonator 63, and water is injected into one side of the first tubular member 5 to increase the dielectric constant in the first tubular member 5, so that the equivalent wavelength in the filter is increased, and the resonance frequency in the filter is decreased. By pumping out the water in the second tube 4, the coupling strength of the second tube 4 is increased, thereby separating the different resonance frequencies, so that the filter keeps the fractional bandwidth constant in case of a change in the resonance frequency. By changing the amount of water in the first tube 5 and the second tube 4, the frequency shift range of the filter is greatly increased, and the effect is shown in fig. 3.

In view of the above description of the filter provided by the present invention, those skilled in the art will recognize that there may be variations in the filter design and its application scope, and accordingly, the disclosure should not be construed as limiting the invention.

Claims

1. A filter, comprising:

the shell is of a hollow structure and comprises a bottom plate, a side plate and a cover plate, wherein the side plate is fixed on the bottom plate, the cover plate is fixed on the side plate, and the cover plate is provided with a through hole;

a first tube secured to the base plate; two ends of the first tubular object respectively protrude out of the edge of the bottom plate, and a notch for clamping the first tubular object is formed in the side plate;

a resonator located on a first tubular;

a second tube sealed at one end, the second tube passing through the through hole and having the sealed end on the bottom plate.

2. The filter of claim 1, further comprising a probe, wherein the bottom plate has a second through hole, and the probe passes through the second through hole and is connected to the resonator.

3. The filter of claim 2, wherein the probe is a differential probe.

4. The filter of claim 2, further comprising a first connector tab, wherein the first connector tab is fixedly connected to the resonator, and wherein the probe is fixedly connected to the first connector tab.

5. The filter of claim 1, further comprising a second connecting piece and a support, wherein the second connecting piece is fixedly connected with the resonator, and the second connecting piece is fixed on the base plate through the support.

6. The filter of claim 1, wherein the first tube is L-shaped, the side plate has a notch adapted to the first tube, and the notches of the side plate clamp two ends of the first tube, so as to fix the first tube to the bottom plate.

7. The filter of claim 1, wherein the number of the first tubes and the resonators are two, and wherein one of the first tubes and the resonators is located on one side of the bottom plate, and the other of the first tubes and the resonators is located on the other side of the bottom plate.

8. The filter of claim 1, wherein the housing is made of a metallic material.

9. The filter of claim 1, wherein the first and second tubes are made of a plastic material.

10. The filter of claim 1, wherein one end of the second tube is sealed with a hot melt adhesive.