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In this letter, a compact wideband bandpass filter (BPF) with a wide stopband is proposed based on the substrate integrated defected ground structure (SIDGS) and folded stepped-impedance resonator (FSIR). Such a SIDGS resonator can not only allocate a specific resonance with compact size but also introduce the different harmonic positions compared with a traditional microstrip line resonator. Meanwhile, due to the discrepant harmonic positions of proposed SIDGS and FSIR, a wide stopband response can be achieved using a compact stacked-coupled scheme. To verify the mechanism, a miniaturized wideband BPF operating at 1.69 GHz (i.e., f<sub>0</sub>) is implemented and fabricated. A measured wide stopband up to 11.8 f<sub>0</sub> with a 20-dB rejection level is achieved.

Compact Wideband BPF With Wide Stopband Using Substrate Integrated Defected Ground Structure