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A compact ultra-wideband (UWB) bandpass filter (BPF) with well matched characteristics is proposed in this paper. The BPF consists of weakly-coupled stepped impedance resonators (SIRs) and parallel-coupled lines. Firstly, the performances of the coupled SIRs were examined, and their results show the broad bandpass characteristics with sharp attenuation slope. Next the bandpass performances of the...
An ultra-wideband bandpass filter (UWB BPF) which consists of inter-digital finger resonators and impedance inverter lines was studied in this paper. The performances of the UWB BPF of three-fingers were calculated and its performances had the attenuation pole at both passband edges. The stopband attenuation and passband reflection were improved by inserting the inverter lines between the finger structure...
A compact band-stop filter (BSF) using quasi-lumped elements is proposed in this paper. The BSF consists of shunt resonators cascaded by quarter-wavelength transmission lines. The resonator using an inductor line and a parallel plate capacitor as quasi-lumped elements is represented by a series LC lumped resonator. The one plate of the capacitor is placed at the back side of the substrate and spaced...
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