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A planar integrated bandpass filter (BPF) structure that makes use of a quarter-mode substrate integrated waveguide (QMSIW) technique is presented in this work for the first time. The proposed bandpass filter is composed of cascaded QMSIW cavities, which are magnetically coupled with the neighbourhood sections. The quarter-mode structure of SIWs makes the overall size largely reduced so it is possible...
This paper presents two types of wideband filters that have been developed at 5 and 28-GHz frequency bands, respectively. These filters have been fabricated with low temperature co-fired ceramics (LTCC) multilayer technologies. Each filter has approximately 20% and 12% 3dB bandwidth, insertion loss less than 1.5 dB, and has an attenuation over 30 dB at fit plusmn15% respectively. Design procedure...
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