Abstract
This study presents a novel design approach of semi-lumped dual-wideband bandpass filters (DWB-BPF) and tri-wideband-BPF (TWB-BPF). One or two pairs of λ/4 uniform-impedance open stubs first generate the desired transmission zeros (TZs) to divide the lowpass frequency response based on radial stub loaded high-impedance microstrip line (RSHIML) into a dual- or tri-band lowpass-bandpass frequency response. Then, a pair of lumped-element capacitors are series to the input and output ports to suppress the direct current signal, so as to transform the lowpass passband to the bandpass passband. Moreover, the other RSHIML is also introduced not only to produce a TZ located at the lower transition band of the first passband to improve its passband selectivity, but also to enhance the passband flatness. As examples, a semi-lumped DWB-BPF and a semi-lumped TWB-BPF are designed and fabricated, which exhibit the merits of wide passbands, low insertion loss and compact size.
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