CN205921064U

CN205921064U - TM mould dielectric resonator and dielectric filter

Info

Publication number: CN205921064U
Application number: CN201620830963.9U
Authority: CN
Inventors: 占思泉; 许建军; 朱晖; 杨秀林
Original assignee: Wuhan Fingu Electronic Technology Co Ltd
Current assignee: Wuhan Fingu Electronic Technology Co Ltd
Priority date: 2016-08-03
Filing date: 2016-08-03
Publication date: 2017-02-01
Anticipated expiration: 2026-08-03

Abstract

The utility model discloses a TM mould dielectric resonator and dielectric filter. TM mould dielectric resonator includes apron, tuning screw rod, TM mould medium resonance bar, cavity and gasket. Tuning screw rod is fixed to be set up on the apron, and the apron lid is established in the cavity top, circular recess has been seted up to the cavity bottom, and gasket fixed position is in the circular recess in cavity bottom, and TM mould medium resonance bar is fixed to be set up on the gasket. The utility model discloses a dielectric filter relies on the resilience force behind the gasket pressurized to guarantee that TM mould medium resonance bar still has good electrical connection when rapid atress and between apron and the cavity to it is reliable and stable to make its electric property, simultaneously, the medium resonance bar who has effectively solved traditional TM mould dielectric filter when failtestss such as high low temperature, easy broken problem. The utility model discloses a product simple structure, easily processing assembly, it can be reliable to produce property, convenient to use, low in production cost can satisfy communication technology's development need, has wide application prospect.

Description

A kind of tm mould dielectric resonator and dielectric filter

Technical field

This utility model is related to communications field antenna feeder device and in particular to a kind of tm mould dielectric resonator and dielectric filter Device.

Background technology

Wave filter, due to having good frequency selectivity, plays an important role in a communications system all the time, But with developing rapidly of communication technology in recent years, frequency spectrum resource is in short supply, the performance and volume of wave filter is proposed increasingly High requirement.Traditional metal coaxial cavity filter scheme gradually cannot meet application needs, tm mould dielectric filter due to There is higher single-chamber q value, favored by more and more engineers.

Traditional tm mould dielectric filter, the fixing meanss of its dielectric resonator mainly have several as follows:

One is after silver on one end of dielectric resonator, is welded on cavity, due to the expansion system of dielectric resonator Number differs larger with the coefficient of expansion of metallic cavity, and the reliability of this installation method is poor, during the failtests such as Wen Xun, medium The easy drawing crack of resonator, therefore, it is difficult to commercially promote.

Two is come mounting medium resonator by metallic screw, due to the introducing of metallic screw, makes the single-chamber q value of wave filter Rapid drawdown, until few or worse with the single-chamber q value difference of metal coaxial cavity wave filter, leads to the superiority in its performance cannot body Existing, therefore practical application has little significance.

Three is come mounting medium resonator by plastic screw, but because the loss of plastics itself is larger and insufficient strength, leads Cause q value to decline and frequency is unstable, therefore also limit its range of application.

Four is to add two cover plates at dielectric resonator top to be fixed, and what one piece of thickness was about 0.5mm has elasticity The cover plate made of material or elastic washer, another piece of thick cover plate pass through internally to empty and fill the forms such as polytetrafluoro material to release Put the method for stress although available, but because its fixing means is complicated, and scrappage be high leads to production cost to remain high, Practical application Difficulty is heavy.

The Chinese utility model patent application of Application No. cn201110190729.6 discloses a kind of tm of two-terminal-grounding Mould dielectric resonator, by having additional prestressed conductive elastomer pad between dielectric resonance post and cover plate, for solving It is in close contact the problem of difficulty, however, finding in actual applications, due to this conductive elastomer between dielectric resonance post and cavity The releasable finite elastic of pad, leads to the reliability decrease of dielectric resonator, and this conductive elastomer gasket construction is complicated, plus Work is relatively costly, is unsuitable for high-volume popularization and application.

Therefore, exploitation designs a kind of tm mould dielectric resonator and dielectric filter, plays its performance to the full extent excellent More it is ensured that tm mould dielectric filter reliability is high on the premise of property, reduce its production cost simultaneously, there is important actual meaning Justice.

Content of the invention

The purpose of this utility model is to solve the deficiency that above-mentioned background technology exists, proposing a kind of tm mould dielectric resonance Device and dielectric filter, so as to have the characteristics that structure is simple, stable and reliable for performance, low production cost, meet communication technology Development need.

For achieving the above object, this utility model provides a kind of tm mould dielectric resonator, including cover plate, tuning screw, tm Mould medium resonant rod and cavity, described tuning screw is installed on the cover board, and described cover plate is covered on above cavity, and described tm mould is situated between Matter resonant rod is cylindric microwave-medium ceramics, and within the cavity, its difference is, described tm mould medium resonant rod upper end Contact with cover plate bottom surface, between lower end and cavity bottom surface, be provided with pad；Described cavity bottom surface and tm mould medium resonant rod corresponding position Offer circular groove；Described pad is circular gasket, and described pad lower surface edge is provided with downwardly convex annulus, described Pad upper end center is provided with the step cutting pattern raising up, and it is humorous that the step cutting pattern of described pad upper end stretches into cylindric tm mould medium Shake in the hole in bar lower surface central authorities, described tm mould medium resonant rod lower surface is in close contact with the step surface of pad upper end, described The downwardly convex annulus of pad stretches in the circular groove of cavity bottom surface, and described annulus lower surface is tight with circular groove inner face Contact.

Preferably, described pad is using the resilient conductive material of tool.

Preferably, the material of described pad is beryllium copper.

Preferably, the aperture of described cavity bottom circular groove is equal or slightly larger than the external diameter of pad bottom annulus.

Preferably, the endoporus aperture of described tm mould medium resonant rod is equal or slightly larger than the circle that pad upper end raises up The diameter of step.

Preferably, the upper surface of described tm mould medium resonant rod and lower surface have all roasted silver layer.

This utility model also provides a kind of dielectric filter, and described dielectric filter includes one or more described tm moulds and is situated between Matter resonator.

The beneficial effects of the utility model:

(1) this utility model passes through to set up pad between tm mould medium resonant rod and cavity bottom dexterously by tm mould Jie Matter resonant rod is fixed positioned in cavity, and pad upper end center is provided with the boss raising up, and opens up circle in cavity bottom simultaneously Shape blind hole, forms multiple spacing in the horizontal direction, passes through tm mould medium resonant rod in vertical direction directly and cover plate simultaneously Contact with pad upper end step face carry out spacing；On the other hand, because pad lower surface edge is provided with downwardly convex annulus, Make pad have certain elasticity, can effectively release temperature circulation change when produced stress, solve traditional tm mould medium Wave filter holds frangible problem because medium resonant rod differs the larger medium resonant rod leading to the cavity coefficient of expansion；Meanwhile, The bottom surface of pad is contacted with cavity bottom and adopts ring-like contact, substitutes original planar contact so as to contact is more good, with When make the electric properties such as the Insertion Loss of wave filter more preferable；

(2), for existing tm mould dielectric filter, structure is simply it is easy to process for wave filter of the present utility model Assembling, properties of product are reliable, and easy to use, low production cost can meet the development need of communication technology.

Describe this utility model below in conjunction with accompanying drawing and embodiment in detail, so that those skilled in the art manage further Solution.

Brief description

Fig. 1 is this utility model embodiment explosive view；

Fig. 2 assembles generalized section for this utility model example structure；

Fig. 3 is the structural representation of the pad of this utility model embodiment；

In figure: 1- cover plate, 2- tuning screw, 3-tm mould medium resonant rod, 4- cavity, (51- annulus, 52- is circular for 5- pad Step, 53- step cutting pattern face), 6- circular groove, 7- tunes nut.

Specific embodiment

With specific embodiment, this utility model is described in further detail below in conjunction with the accompanying drawings, but described concrete Embodiment is only used for explaining this utility model, does not limit protection domain of the present utility model:

As depicted in figs. 1 and 2, the present embodiment is related to a kind of tm mould dielectric resonator, including cover plate 1, tuning screw 2, tm Mould medium resonant rod 3, cavity 4 and pad 5.Tuning screw 2 passes through tuning nut 7 and is fixedly installed on cover plate 1, and cover plate 1 lid sets Above cavity 4；Cavity 4 bottom offers circular groove 6, and pad 5 is coordinated with the circular groove 6 of cavity bottom by its bottom Thus being fixed positioned on cavity 4 bottom.

As shown in figure 3, described pad 5 upper end center is provided with the step cutting pattern 52 raising up, step cutting pattern 52 stretches into tm Mould medium resonant rod 3, reaches the purpose of horizontal stationary positioned tm mould medium resonant rod 3；Lower surface edge is provided with downwardly convex Annulus 51, pad 5 and cavity 4 bottom are ring-like contact；The circle that the base diameter of described pad 5 is equal to cavity 4 bottom is recessed The aperture of groove 6 subtracts 0.1mm, and the diameter of the upper end step cutting pattern of described pad 5 subtracts equal to the endoporus aperture of tm mould medium resonant rod 3 0.1mm；Described two-stage step pad is processed by beryllium copper, and its lower surface edge is provided with downwardly convex annulus 51, this Kind special structure and material make it have good elasticity, in actual applications, can effective release temperature circulation change when institute The stress producing, thoroughly solves traditional tm mould dielectric filter and leads to because medium resonant rod differs larger with the cavity coefficient of expansion Medium resonant rod hold frangible problem.

Described tm mould medium resonant rod 3 is cylindric microwave-medium ceramics, its upper and lower both ends of the surface roasting silver, and silver thickness is about 0.6 μm, upper surface is in close contact with cover plate 1, and lower surface is in close contact with pad 5, thus the longitudinal direction realizing medium resonant rod is fixed Position；Tuning screw 2 is used for the fine setting of resonator resonant frequency.

This utility model embodiment additionally provides a kind of dielectric filter, described dielectric filter include one or more such as Front described tm mould dielectric resonator.Described dielectric filter is passed through by one or more foregoing tm mould dielectric resonators Coupling (as window etc.) links together, and forms multistage dielectric filter.

Dielectric filter provided by the utility model can make medium upper end and cover plate be in close contact, lower end pass through pad with Cavity bottom conducts, thus it is ensured that it has good electric property.

Although above-described embodiment is made that detailed description to this utility model, it is only this utility model part Embodiment, rather than whole embodiments, people can also obtain other enforcements according to the present embodiment under the premise of without creativeness Example, these embodiments broadly fall into the scope of the present invention.

The content that this specification is not described in detail belongs to the state of the art.

Claims

1. a kind of tm mould dielectric resonator, including cover plate, tuning screw, tm mould medium resonant rod and cavity, described tuning screw Install on the cover board, described cover plate is covered on above cavity, described tm mould medium resonant rod is cylindric microwave-medium ceramics, position It is characterised in that described tm mould medium resonant rod upper end is contacted with cover plate bottom surface in cavity, set between lower end and cavity bottom surface There is pad；Described cavity bottom surface and tm mould medium resonant rod corresponding position offer circular groove；Described pad is circular gasket, institute State pad lower surface edge and be provided with downwardly convex annulus, described pad upper end center is provided with the step cutting pattern raising up, The step cutting pattern of described pad upper end stretches in the hole in cylindric tm mould medium resonant rod lower surface central authorities, and described tm mould medium is humorous Shake bar lower surface with the step surface close contact of pad upper end, the downwardly convex annulus of described pad stretches into the circle of cavity bottom surface In groove, described annulus lower surface is in close contact with circular groove inner face.

2. tm mould dielectric resonator according to claim 1 is it is characterised in that described pad is using the resilient conduction of tool Material.

3. tm mould dielectric resonator according to claim 2 is it is characterised in that the material of described pad is beryllium copper.

4. tm mould dielectric resonator according to claim 1 is it is characterised in that the aperture of described cavity bottom circular groove It is equal or slightly larger than the external diameter of pad bottom annulus.

5. tm mould dielectric resonator according to claim 1 is it is characterised in that the endoporus hole of described tm mould medium resonant rod Footpath is equal or slightly larger than the diameter of the step cutting pattern that pad upper end raises up.

6. according to described tm mould dielectric resonator arbitrary in claim 1-5 it is characterised in that described tm mould medium resonant rod Upper surface and lower surface all roasted silver layer.

7. a kind of dielectric filter is it is characterised in that described dielectric filter includes some such as any one of claim 1 to 6 Described tm mould dielectric resonator.