A Microstrip Dual-Band Bandpass Filter with Reduced Size and Improved Stopband Characteristics
نویسندگان
چکیده
A novel compact microstrip dual-band bandpass filter(BPF) is developed with remarkably improved stopband characteristics. Two square open-loop resonators are embedded in a U-shaped resonator to achieve a significant size-reduction of the filter. Meanwhile, a cross-coupling between nonadjacent resonators is exploited to produce multiple transmission zeros in the stopbands of the filter. As a consequence, wide stopbands with sharp and large attenuations are obtained. Theoretical and measured frequency responses of the designed filter show a good agreement. Index Terms — cross-coupling, dual-band filter, open-loop resonator, transmission zero.
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