Compact Tunable Bandpass Filter with Continuous Control of Center Frequency and Bandwidth Independently

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...

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Veröffentlicht in:Progress in electromagnetics research. Letters 2023-01, Vol.114, p.31-36
Hauptverfasser: Cao, Liangzu, Yin, Lixia
Format: Artikel
Sprache:eng
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Zusammenfassung: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 [mm.sup.3] (0.045[[lambda].sub.0] *0.041[[lambda].sub.0] *0.012[[lambda].sub.0]). The measured results agree with the simulation outcome.
ISSN:1937-6480
1937-6480
DOI:10.2528/PIERL23090405