Dielectric double short filter

Abstract

The invention relates to a dielectric double short filter, which comprises a cavity body with an open end, a cover plate mounted at the open end of the cavity body, and a tuning assembly mounted on the cover plate and the cavity body. The tuning assembly comprises a support seat, a dielectric resonant column and an elastic member which are connected in sequence. The cover plate has a mounting hole. The support seat comprises a first mounting part which is mounted in the mounting hole of the cover plate. The cavity body has a receiving cavity at the bottom. The elastic part comprises a second mounting part which extends into the receiving cavity and abuts against the inner wall of the receiving cavity along the radial direction of the receiving cavity. The contact reliability of the filteris improved.

Description

[0001] 【Technical field】 [0002] The present invention relates to a dielectric filter, more specifically, to a TM (transverse magnetic) mode dielectric double short filter. [0003] 【Background technique】 [0004] TM mode dielectric double-short filter is used as the transceiver filter of the key components of the radio frequency front end of the mobile base station, and its performance directly affects the quality of communication. With the development of mobile communication networks and the approach of 5G technology, dielectric filters have the characteristics of miniaturization and high Q value, and are widely used in 5G technology. [0005] In an existing dielectric double-short filter, on the one hand, the dielectric resonance column is usually combined with a silver-plated copper sheet and a rubber elastic washer to be crimped to the bottom of the cavity. In high and low temperature environments, the rubber elastic washer will thermally expand. The cold shrinkage effec...

AI Technical Summary

Problems solved by technology

[0005] In an existing dielectric double-short filter, on the one hand, the dielectric resonance column is usually combined with a silver-plated copper sheet and a rubber elastic washer to be crimped to the bottom of the cavity. In high and low temperature environments, the rubber elastic washer will thermally expand. The cold shrinkage effect affects the short-circuit contact between the dielectric resonant column and the cavity, thereby affecting the index of the filter in high-temperature or low-temperature environments; on the other hand, the filter adopts the structure of two thick and thin cover plates, because the thickness of the thin cover is small , processed with aluminum, the flatness of the plane is poor, and it is easy to deform, which will lead to poor contact between the cover plate and the dielectric resonator, affecting the Q value and intermodulation of the filter

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