In this article, a bandpass filter (BPF) is proposed by
etching stepped impedance complementary split ring resonators
(SICSRRs) pairs in parallel with series gaps on the top side of a
coplanar waveguide (CPW). The Nicolson-Ross-Weir (NRW) method is
used to analyze the left-handed (LH) behavior of the filter. The
effects of the resonators parameters on the left-handed BPF are
studied. The parameters and number of the resonators are adjusted
properly to obtain the desired filter characteristics. Split ring
resonators (SRRs) are magnetically coupled to the BPF to realize a
novel left-handed dual-band bandpass filter. Besides, The dual-band
filter is described by means of the lumped-element equivalent
circuit model. Also, the quasi-static analysis is used to obtain the
equations for the resonant frequencies of the resonators. The
efficient electrical size of the dual-band filter is
0.51λg
× 0.42λg
where λg
represents the guided wavelength at the first passband center
frequency. The prototype of the compact dual-band BPF is fabricated
and measured. The measured results reveal low insertion loss and
high return loss at the passbands along with wide upper stopband
attenuation. The measured result is in a good agreement with the
corresponding simulation result.
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