期刊
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
卷 68, 期 2, 页码 667-671出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2020.3014499
关键词
Resonators; Radio frequency; Frequency modulation; Resonant frequency; Band-pass filters; Microstrip; Bandpass filter (BPF); isolator; microstrip; magnetless; non-reciprocal; time-invariant; time-modulated; tunable
资金
- Defense Advanced Research Projects Agency [HR0011-17-C-0029]
- National Science Foundation [ECCS-1749177]
- Spanish Ministry of Education [PRX18/00092, TEC2016-75934-C4-4-R, 19494/PI/14]
- National Natural Science Foundations of China [61601234]
This novel frequency reconfigurable microstrip non-reciprocal bandpass filter utilizes time-modulated microstrip λ(g)/2 resonators for frequency tuning. With the wideband isolation scheme, the device can be tuned over a wide frequency range while achieving low insertion loss.
This brief presents a novel frequency reconfigurable microstrip non-reciprocal bandpass filter based on time-modulated microstrip lambda(g)/2 resonators. The modulation is achieved by loading both ends of the lambda(g)/2 transmission line resonators with time-modulated capacitors. The modulation voltage source is connected at the center of the resonator, where there is a natural voltage null, and a single inductor is used to further enhance the biasing isolation. The wideband nature of this isolation scheme enables the tuning of the devices over a wide frequency range. With more than 30-dB RF to modulation isolation, the proposed resonator structure also enables low insertion loss by eliminating RF signal leakage to the modulation ports. A 3-pole bandpass filter example is simulated and measured, showing a minimal insertion loss of 3.9dB, a 20-dB isolation bandwidth of 42MHz at 1.0GHz, and frequency tuning range of 885-1031MHz.
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