Structure for improving performance of TEM all-dielectric filter

Abstract

The invention discloses a structure for improving the performance of a TEM all-dielectric filter, comprising a dielectric cavity block, a signal shielding metal sheet and a PCB substrate. The dielectric cavity block and the PCB substrate are welded together. One end of the signal shielding metal sheet is welded to the dielectric cavity block, and the other end is welded to the PCB substrate. The dielectric cavity block is provided with resonant holes. The inner wall of each resonant hole is plated with a silver layer, and the depth of the silver layers is less than 2 / 3 of the depth of the resonant holes. The structure is simple and convenient to manufacture. A silver layer of a certain depth is plated in the resonant holes of the existing TEM all-dielectric filter, and the height of silveris controlled according to the cavity material and size of the holes and the aperture of the resonant holes, so that the Q value of the TEM all-dielectric filter is improved while the frequency requirement of the TEM all-dielectric filter is satisfied. By controlling the ratio of the height of silver to the height of the resonant holes, the Q value of the TEM all-dielectric filter of the invention is at least 20% higher than that of the traditional TEM filter.

Description

technical field [0001] The patent of the invention relates to base station filters, antenna feeder tower amplifiers, combiners and anti-interference filters in the field of communication, and specifically relates to a structure for improving the performance of a hybrid TEM all-dielectric filter. Background technique [0002] With the rapid development of wireless mobile communication, the signal coverage in the low frequency band is larger, and the diffraction performance of the signal is also better. The requirements for the miniaturization of communication equipment at low frequencies are increasing, especially in the field of low frequency filters, transverse electromagnetic mode ( Transverse Electromagnetic, referred to as TEM mode) dielectric filter, as a common radio frequency device, is used in wireless microphones, terminals and network equipment printed circuit boards (Printed Circuit Board, referred to as PCB), etc., TEM mode dielectric filters in the prior art incl...

AI Technical Summary

Problems solved by technology

Traditional TEM mode filters have not studied the relationship between cavity size, resonant hole, upper silver height and Q value in depth, but the Q value of the same volume and different resonant apertures and upper silver heights at the same frequency is the largest or even 1000 Due to the above differences, it is urgent to find a Q-value-enhancing structure with different silver heights and different pore diameters under the same volume, the same dielectric material, and the same frequency.

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