Abstract
In this letter, a compact bandpass filter is proposed based on the hybrid microstrip/defected ground structure (DGS) cells with an interdigital-coupled (IC) scheme. The hybrid cell can employ two functions for the filter: 1) dual-resonances operation and 2) two close transmission zeros around the resonances. With a proper coupled scheme (i.e., the IC scheme), the narrow-band coupling for the passband enhancement of high selectivity and wide stopband can be achieved. Then, a filter operated at 2.455 GHz (i.e., <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">f</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ) is fabricated, which shows the strong attenuation slope with 427.2 dB/GHz in the lower and 779.1 dB/GHz in the upper transition bands and a wide stopband up to 3.56 <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">f</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> .
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