Filter, resonator, and communication device

Abstract

The invention relates to a filter, a resonator and a communication device. According to the invention, in a process of reducing the temperature drift of the filter by optimizing the height dimension h1 of a metal resonance rod and the height dimension h2 of a boss, an adjusting screw rod is not limited by the resonator and the boss in the process of adjusting the position up and down, that is, in the process of reducing the height h1 of the metal resonance rod, the distance between the metal resonance rod and the top face of the boss in a traditional product does not need to be considered, and the height h1 of the metal resonance rod can be flexibly set according to actual requirements, so that the adjustable range is large, the height h2 of the boss can also be flexibly set according to actual requirements, the adjustable range is large, and the temperature drift of the product can be controlled to be within a preset range; and in order to reduce the temperature drift of the filter, the temperature drift of the filter can be controlled to be in a preset range by selecting an iron material with lower cost instead of adopting a copper material with higher cost, so that the product cost can be reduced at the same time.

Description

technical field [0001] The invention relates to the technical field of communication devices, in particular to a filter, a resonator and a communication device. Background technique [0002] With the rapid development of communication systems entering the 5G era, the use of low frequency 700MHz, there are multiple commercial frequency bands within 100MHz-960MHz, which requires considerable suppression between each frequency band, which puts forward requirements for filter suppression. Especially in high and low temperature conditions, it is required that the suppression does not deteriorate. [0003] see figure 1 , figure 1 A schematic structural diagram of a conventional filter is shown. The traditional filter includes a metal resonator 110, a boss 120 arranged on the bottom wall of the metal resonator 110, a metal resonator 140 fixed on the boss 120 by screws 130, and a cover set on the metal resonator 110. The mouth cover plate 150 and the adjusting screw 160 installe...

AI Technical Summary

Problems solved by technology

However, at this time, since the distance H3 between the end face of the adjusting screw 160 and the screw 130 is relatively small, the filter product will not be manufacturable, and the frequency adjustment range of the adjusting screw 160 will also be limited.

In addition, the material of the resonator is also replaced with copper. Although the temperature drift is reduced to a certain extent, the copper will increase the product cost.

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