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This paper proposes a novel compact dual-band bandpass fllter (BPF) using four spiral resonators for application in GSM and IEEE 802.11b WLANs for the flrst time. Since the two passbands can be tuned individually, the fllter has more design freedoms. The symmetry coupling structure is realized to achieve a isolation higher than 30dB between the lower and higher passbands. The full-wave simulator IE3D is used to design the spiral resonators and calculate the coupling coe-cients of the basic coupling structures. The designed BPF is fabricated and measured. Good agreement between the simulated and measured results verifles our design concept.

A SIMPLE METHOD TO DESIGN A COMPACT AND HIGH PERFORMANCE DUAL-BAND BANDPASS FILTER FOR GSM AND WLAN