Aminiaturized bandpass filter (BPF) using defected ground structure (DGS) resonatorwith the characteristic of harmonic rejection\nis developed in this paper. The second and third harmonics of the proposed BPF are rejected by the characteristic of steppedimpedance\nDGS resonator. Moreover, open stubs are established so that two adjustable transmission zeros can independently be\ncreated to extend the stopband and improve the rejection level. Finally, a second-order BPF, centered at 1.62GHz with a stopband\nextended up to 5.6GHz and a rejection level better than 20 dB, is designed and implemented for GPS application. A good agreement\nbetween simulation and measurement verifies the validity of this design methodology.
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