Ultra-wideband bandpass filter
A bandpass filter (BPF) design using double-sided edge-coupled microstrip lines and stepped impedance stubs features intrinsic transmission poles, beneficial for achieving an ultrawide bandwidth. When shunted with stubs of different length ratios, multiple transmission zeros are introduced, yielding sharp band edges, deep out-of-band attenuation and high in-band return loss. Experimental results show in-band return loss greater than 16 dB from 3.1 to 10.6 GHz and out-of-band attenuation of 34 dB and 18 dB for the lower and upper stopbands, respectively, while the band edges are very sharp.
Feng, X; Zhang, Y; Zhu, G; Fan, Y; Joines, WT; Liu, QH
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