Coupling Structure of Improved Filter

Abstract

The invention discloses an improved coupling structure of a filter. The improved coupling structure comprises a conductor rod, a first coupling disc, a resonance rod, a medium and a metal shell. Containing space is formed inside the metal shell. The conductor rod, the coupling disc and the resonance rod are all placed in the containing space. One end of the conductor rod is fixedly connected with the first coupling disc, and the other end of the conductor rod extends out of the metal shell. The containing space of the metal shell is filled with the medium. The improved coupling structure is characterized by further comprising a connecting column and a second coupling disc, one end of the connecting column is fixed to the side wall of the resonance rod, the other end of the connecting column is perpendicularly fixed to the second coupling disc, and therefore the first coupling disc and the second coupling disc are fixed; the first coupling disc and the second coupling disc are arranged right opposite to each other, and an interval exists between the first coupling disc and the second coupling disc. The interval between the first coupling disc and the second coupling disc is increased, the improved coupling structure can not be easily broken through, performance of the filter is stable, influences of the environment on the filter are small, and the improved coupling structure can meet the requirements of large-power filters.

Description

Technical field [0001] The invention relates to a filter in the field of microwave passive circuits, in particular to an improved coupling structure of the filter. Background technique [0002] The role of the filter is to pass signals of a specific frequency, while attenuating signals outside the frequency. Some filters, multiplexers or combiners have performance requirements: high power capacity, high Q value, and low loss. The physical input and output coupling coefficients need to be adjustable or the input and output impedances need to be capacitive in a specific stop band. At this time, the commonly used coupling structure of electric field coupling includes two poles, one pole A is connected to the end of the inner conductor of the coaxial transmission line, and the other pole B is on the resonance rod. Such as figure 1 As shown, pole A uses a circular input and output coupling disc 1, and its only stress point is on the inner conductor 2 of the RF connector. The position...

AI Technical Summary

Problems solved by technology

[0011] The present invention proposes a coupling structure of an improved filter, which mainly solves the problem that the coupling area between the coupling plate where pole A is located and the resonant rod where pole B is located is small in the prior art. The problem that the relative position of the rod is easy to change

Images