Filter

A filter and dielectric resonator technology, applied in waveguide devices, electrical components, circuits, etc., can solve the problems of high filter failure risk, high long-term reliability risk, small thermal expansion coefficient, etc., and achieve the goal of reducing cracking phenomenon Probability, guaranteed reliability, and the effect of improving the life of solder joints

CN102222811AInactive Publication Date: 2011-10-19HUAWEI MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-10-19
Estimated Expiration
Not applicable · inactive patent

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    Figure 1
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    Figure 2
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    Figure 3
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Abstract

The invention discloses a filter relating to the field of communication equipment. The filter can reduce the possibility that a welding spot of a medium resonator is cracked owning to the difference of thermal expansion coefficient. The filter provided by the embodiment of the invention comprises a medium resonator, a chamber body and a connecting piece, wherein the medium resonator is arranged in the chamber body; the medium resonator is welded on the connecting piece that is connected with the chamber body together; the medium resonator is not directly contacted with the chamber body; the difference of the thermal expansion coefficient of the connecting piece and the thermal expansion coefficient of the medium resonator is less than that of the thermal expansion coefficient of the chamber body and the thermal expansion coefficient of the medium resonator, and / or the connecting piece is a deformation damping structural part with the elastic deformation capability higher than that of the chamber body. The filter is applied to the design concept on a novel filter and is mainly applied to a novel comb-shaped linear medium resonation mode.
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Description

Technical field

[0001] The invention relates to the field of communication equipment, in particular to a dielectric filter. Background technique

[0002] The filter is an important component commonly used in communication engineering. It has frequency selectivity for signals. It passes or blocks, separates or synthesizes signals of certain frequencies in the system. The resonant cavity of a dielectric filter is mainly composed of a dielectric resonator and a cavity. Dielectric resonator refers to the electronic component that produces the resonant frequency. It has many resonant modes. The electromagnetic field of the dielectric comb-line resonance mode is similar to the electromagnetic field of the metal comb-line resonance mode. Compared with other modes, Q( The parameter of the inductance device is high, and it is easy to make a high-performance filter; while in the dielectric comb-line filter cavity, one end of the dielectric resonator is welded to the bottom wall of the cavi...

Examples

Embodiment 1

[0027] See figure 1 , The filter of the embodiment of the present invention includes a dielectric resonator 1, a cavity 2 and a connector 3. The dielectric resonator 1 is installed in the cavity 2, and the dielectric resonator 1 is welded to the connector 3 and connected The part 3 is connected to the cavity 2 and the dielectric resonator 1 is not in direct contact with the cavity 2; in this way, the connection between the dielectric resonator 1 and the cavity 2 through the connector 3 is formed. The design of the connector 3 can be as follows One or two of the solutions:

[0028] First, the difference between the thermal expansion coefficient of the connecting piece 3 and the thermal expansion coefficient of the dielectric resonator is smaller than the difference between the thermal expansion coefficient of the cavity 2 and the thermal expansion coefficient of the dielectric resonator.

[0029] Second, the connecting member 3 is a deformation buffer structure with an elastic defor...

Embodiment 2

[0042] The filter of the embodiment of the present invention may also adopt another design, as follows:

[0043] See Figure 5 , The filter of the embodiment of the present invention includes a dielectric resonator 1 and a cavity 2. The dielectric resonator 1 and the cavity 2 are welded together. The cavity 2 is a sheet metal part. The material of the cavity 2 is directly replaced. For sheet metal parts with a smaller thermal expansion coefficient, the CTE of the sheet metal parts is generally small, which is close to the ceramic material of the dielectric resonator 1. In this way, the reliability of the solder joints of the dielectric resonator can be guaranteed and the dielectric resonator 1 and the cavity can be reduced. The probability of body 2 cracking due to the difference in thermal expansion coefficient.

[0044] In the above design, in order to provide a specific design of sheet metal parts that can be implemented, the sheet metal parts in the filter of the present invent...

Embodiment 3

[0046] See Picture 10 , The filter of the embodiment of the present invention includes a dielectric resonator 1 and a cavity 2. The dielectric resonator 1 and the cavity 2 are welded together, and the weld 10 between the dielectric resonator 1 and the cavity 2 is provided with columnar reinforcement The two ends of the reinforcing member 11 are welded to the dielectric resonator 1 and the cavity 2 respectively, and the area where the reinforcing member 11 is not provided at the welding seam 10 is filled with the above-mentioned solder 12, so that the reinforcing member 11 can be installed Increasing the thickness of the welding seam 10 can increase the life of the welding joint to a certain extent, and ultimately reduce the probability that the dielectric resonator 1 and the cavity 2 will crack due to the difference in thermal expansion coefficient.

[0047] In the filter of the embodiment of the present invention, the columnar reinforcement 11 is provided with a plurality of hol...