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In this paper, an ultra-wideband (UWB) bandpass filter (BPF) using a modified multiple-mode resonator (MMR) is proposed, designed and fabricated on Al2O3 ceramic substrate. The length of MMR is 2mm and the width of MMR is changed from 1.35mm to 2.66mm to find the optimal value. Interdigital structure coupling lines are used to couple the input/output microstrip lines. Measured results achieve the...
A novel ultra-wideband (UWB) bandpass filter with four resonant modes is proposed based on a parallel coupled microstrip line (PCML) with L- and C-shaped resonators. The coupling factor of the PCML structure depends on the impedance of the feeding network. The PCML coupling factor can be enhanced by using a feeding network with smaller characteristic impedance. With an L-shaped feeding network and...
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