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In this work, substrate integrated waveguide (SIW) bandpass filters were designed and fabricated using LTCC process. The proposed scheme consists of SIW cavities with coupling slots and coplanar waveguide (CPW) transitions. To reduce the component size and surface occupation, three SIW cavities are laminated vertically. Both horizontal transition and vertical transition are used between the two CPW...
This paper presents a frequency-agile bandpass filter with constant absolute bandwidth and high linearity. The proposed resonator is composed of an open-ended transmission line with back-to-back varactor diodes loaded at one end. A novel mixed electric and magnetic coupling scheme is proposed to contorll the coupling coefficients in order to keep the bandwidth constant when the frequency is tuned...
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