Abstract
A compact microstrip bandpass fllter using miniaturized hairpin resonators is presented in this letter. Two modifled stepped impedance hairpin resonators connected by parallel coupling are designed for the bandpass fllter. The proposed miniaturized hairpin resonator is composed of a microstrip line and rectangular ring structures between parallel high impedance lines. A big capacitance in the hairpin resonator is provided by the gaps of rectangular ring structures in the parallel high impedance lines. Therefore, the proposed bandpass fllter using the hairpin resonators has a low insertion loss, low return loss and compact size. The proposed bandpass fllter with a center frequency of 4.96GHz is designed with EM full wave simulator IE3D and verifled with experiment.
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