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This paper presents a tunable dual-band microstrip after using step-impedance resonators (SIR) with wide stopband and low insertion loss. The dual-band Alter employs two SIR single-band Alters for the specifications of the two passbands respectively and using novel layout to make the two single-band Alter can be designed independently and achieve wide stopband. A prototype dual-band filter operated at 2.07 and 3.15 GHz is designed and fabricated. The upper stopband is extended over 10 GHz. Good agreement achieved between the numerical and measured results.
Millimeter Waves, 2008. GSMM 2008. Global Symposium on
Date of Conference: 21-24 April 2008