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A novel compact microstrip dual-band bandpass filter (BPF) using short-stub loaded half-wavelength resonator with multiple transmission zeros and good selectivity is proposed in this letter. The characteristics of the dual-mode resonator are investigated by using even-odd mode analysis. To improve filter selectivity, a new structure of hook feed line of couple-line is introduced to produce six transmission zeros at the adjacent two passbands. A prototype of dual-band bandpass filter for WLAN (2.4 GHz) and WiMAX (3.5 GHz) applications is designed and fabricated for demonstration. Good agreement is observed between the measured and the theoretical expectation.
Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on (Volume:5 )
Date of Conference: 5-8 May 2012