Design of High Performance Microstrip Dual-Band Bandpass Filter

This paper presents a new design of dual-band bandpass filters using coupled stepped-impedance reso- nators for wireless systems. This architecture uses multiple couple stubs to tune the passband frequencies and the filter characteristics are improved using defected ground struc- ture (DGS) technique. Measurement results show insertion losses of 0.93 dB and 1.13 dB for the central frequencies of 2.35 GHz and 3.61 GHz, respectively. This filter is de- signed, fabricated and measured and the results of the simulation and measurement are in good agreement.

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