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In this paper, design and fabrication of a quad- band microstrip bandpass fllter (BPF) using multi-layered stepped impedance resonators (SIRs) structure is proposed. One pair of SIR on the top layer is designed to operate at the 1st and 3rd passbands (1.56/3.57GHz), and the other pair is at 2nd and 4th passbands (2.42/5.23GHz) by tuning the impedance and length ratios of the SIRs. In order to flnd the desired coupling location between the SIRs located on difierent layers and the input/output (I/O) lines, the voltage, current and power wave on the I/O lines are analyzed. It is verifled that the proposed quad-band fllter has good passband performances with an excellent isolation between adjacent bands for GPS, WLAN, and WiMAX applications.

DESIGN AND FABRICATION OF A QUAD-BAND BANDPASS FILTER USING MULTI-LAYERED SIR STRUCTURE