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This paper presents a dual-band tunable bandpass fllter with independently controllable dual passbands based on a novel asymmetric ‚=4 resonator pair with shared via-hole ground. Because two separated passbands can be independently generated by the two ‚=4 resonators with difierent electric lengths, the asymmetric ‚=4 resonator pair can realize ∞exible passband allocation when it is utilized to design dual-band fllters. Two varactors are placed at the two open circuit ends of the asymmetric ‚=4 resonator pair to control the two dominant resonant frequencies, respectively. A prototype tunable dual-band fllter with Chebyshev response is designed and fabricated. The measured results are in good agreement with the full-wave simulated ones. The results show that the flrst passband varies in a frequency range from 0.88GHz to 1.12GHz with the 3-dB fractional bandwidth of 5.1%{6.4%, while the second passband can be tuned from 1.5GHz to 1.81GHz with the 3-dB fractional bandwidth of 5.4%{6.4%.

AN INDEPENDENTLY TUNABLE DUAL-BAND FILTER USING ASYMMETRIC λ/4 RESONATOR PAIRS WITH SHARED VIA-HOLE GROUND