3D integrated superminiature band pass filter

Abstract

The invention provides a 3D integrated superminiature band-pass filter which is realized by adopting a semi-lumped structure, and comprises an input / output port, four parallel-connection resonant cells, an inter-stage coupling capacitor and a Z-shaped crossed coupling capacitor. According to the band-pass filter provided by the invention, interconnection between stages is realized by virtue of electromagnetic coupling among the resonant cells. By virtue of an LTCC (low temperature co-fired ceramic) laminating structure, an equivalent lumped parameter element is realized. Compared with the prior art, the 3D integrated subminiature band-pass filter has the advantages of a small size, low cost, good frequency-selection characteristic, high temperature stability and small insertion loss, can be machined into a paster film, is convenient to integrate with other microwave assemblies and beneficial to mass production. The scheme adopted by the invention can be used for inhibiting out-of-band harmonic waves, and is applicable to occasions and corresponding systems with strict requirements on size, electrical performance, temperature stability and reliability, such as communication terminals of corresponding microwave millimeter wave frequency bands, digital radars and wireless communication hand-held terminals.

Description

technical field [0001] The invention relates to a power splitter, in particular to a three-dimensional integrated ultra-small band-pass filter. Background technique [0002] Nowadays, whether it is military radar, electronic detection, electronic countermeasures, etc., or civilian mobile phone communication, TV, and remote control, it is necessary to distribute and process electronic signals, which requires the use of an important microwave passive device-filter. With the rapid development of miniaturization of mobile communication, satellite communication and national defense electronic systems, high performance, low cost and miniaturization have become the development direction of the microwave / radio frequency field, and the performance, size, reliability and cost of filters are all affected. put forward higher requirements. In some state-of-the-art national defense equipment, the frequency bands used are quite crowded now, so cutting-edge equipment such as satell...

AI Technical Summary

Problems solved by technology

[0004] At present, a lot of research has been done on bandpass filters at home and abroad. The low-frequency band occupies too much volume and the integration level is not high, which is far from meeting the requirements of miniaturization.

In addition, most of the current filters, if they want to suppress the clutter frequency near the passband, the attenuation in the stopband is insufficient

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