| Summary: | 碩士 === 逢甲大學 === 通訊工程學系 === 105 === This papper proposed novel structure of daul-band bandpass filter ,and adopts Stepped Retepped Impedancesonator (SIR) as the basic framework of the circuit. Designed of passband applied to GSM (0.9GH.z) and Wifi (1.57GHz). The Stepped Impedance Resonator (Stepped Impedance Resonator, SIR) and the of special architecture used of over-coupling, to achieve a good passband and harmonic suppression. The initial structure was bent,and near the passband have four transmission zeros, both high and low frequency stopband can reach the restriction under -40dB, the return loss and insertion loss had good features. Suppression of parasitic produced harmonic, to achieve a good harmonic suppression effect,in frequency response,harmonic suppression was extended to 12GHz with a rejection level higher than -23dB. Finally,The area was reduced by 61.4% and realized on FR4 sheets.
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