Ka-band millimeter wave broadside-coupled band-pass filter of LTCC

Abstract

The invention discloses a Ka-band millimeter wave broadside-coupled band-pass filter of LTCC. The filter comprises a front metal wall, a rear metal wall, an upper earth plate, a lower earth plate, an input port, an output port, five layers of earth plates, ten strip lines and three middle metal posts, wherein the input port and the output port are formed in the surface of the filter, the earth plates are internally connected with the strip liens in fault portions, and the ten strip lines and the three middle metal posts are internally connected with the earth plates. The Ka-band millimeter wave broadside-coupled band-pass filter has the advantages of being small in transverse area, low in weight, high in reliability, low in large-scale production cost and the like. A millimeter wave frequency band is the main frequency band in technological development of current military electronics, and is widely used in corresponding systems with strict requirements for size, weight, performance and reliability such as radars, communication, precision guidance, and the electronic countermeasure and testing technology.

Description

technical field [0001] The invention relates to a filter, in particular to a Ka-band millimeter-wave broadside coupling band-pass filter of LTCC. Background technique [0002] Microwave filter is a kind of lossless two-port network, which is widely used in microwave communication, radar, electronic countermeasures and microwave measuring instruments. Through the filter, the transmission of unwanted signal frequency components is blocked. In practical engineering applications, the time required from the specification of filter specifications to the finished product will be shorter and shorter, and it will be an inevitable trend of engineering design and market competition to quickly and accurately design high-performance microwave filters. With the development of science and technology, the emergence of new materials and new processes, such as the rapid development of semiconductor technology, various new RFICs and modules emerge in an endless stream, which shortens the desi...

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Problems solved by technology

On the other hand, the resonant units of the comb line filter are all half-wavelength, and the stop-band suppression is poor when the number of stages is small. Increasing the number of stages can improve the stop-band suppression but will undoubtedly increase the size of the filter

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