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摘要
A bandpass filter with wide stopband is proposed using the novel broadside-coupled microstrip T-stub/defected ground structure cells in this letter. The resonance of the proposed cell is finely adjusted. Besides, these cells with a proper coupled-structure (i.e., interdigital coupled scheme) can achieve high selectivity only around the resonance, which leads to wide stopband operation. The measured filter operated at 2.2 GHz (i.e., center frequency f(0)) exhibits a wide stopband up to 9.1 f(0) with a good rejection level greater than 30.5 dB.
