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2023-11-26
Compact Tunable Bandpass Filter with Continuous Control of Center Frequency and Bandwidth Independently
By
Progress In Electromagnetics Research Letters, Vol. 114, 31-36, 2023
Abstract
This paper presents a compact electrically tunable bandpass filter with continuous control of center frequency and bandwidth independently. The filter consists of two coaxial dielectric resonators loaded with two varactors for center frequency tuning. A symmetrical Y-type capacitor network used for tuning bandwidth is proposed. A prototype made of dielectric ceramics with dielectric constant of 88 has been designed, fabricated and measured. The center frequency varies from 0.562 GHz to 0.845 GHz and 3 dB bandwidth is tuned from 117 MHz to 194 MHz at the center frequency of 845 MHz. A constant absolute bandwidth of 141 MHz is realized by varying simultaneously bias voltages. The volume of fabricated filter containing bias networks is 24×22×6.5 mm3 (0.045λ0×0.041λ0×0.012λ0). The measured results agree with the simulation outcome.
Citation
Liangzu Cao, and Lixia Yin, "Compact Tunable Bandpass Filter with Continuous Control of Center Frequency and Bandwidth Independently," Progress In Electromagnetics Research Letters, Vol. 114, 31-36, 2023.
doi:10.2528/PIERL23090405
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