Tunable active three-way circulator using tunable transistor feedback network

An active three-way circulator is proposed to have the tunable property by the tunable transistor feedback network (TTFN). This tunable design shows its tunable frequency range from 1.15 to 1.85 GHz (bandwidth of 47%) with the isolation >20 dB, the insertion losses of around 3.5 dB and return los...

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Veröffentlicht in:	Electronics letters 2017-11, Vol.53 (24), p.1591-1592
Hauptverfasser:	Mung, S.W.Y, Chan, W.S
Format:	Artikel
Sprache:	eng
Schlagworte:	circuit feedback circulators FET frequency 1.15 GHz to 1.85 GHz insertion loss Microwave technology return loss TTFN tunable active three‐way circulator tunable transistor feedback network UHF circuits UHF field effect transistors varactor diode varactors
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Zusammenfassung:	An active three-way circulator is proposed to have the tunable property by the tunable transistor feedback network (TTFN). This tunable design shows its tunable frequency range from 1.15 to 1.85 GHz (bandwidth of 47%) with the isolation >20 dB, the insertion losses of around 3.5 dB and return losses better than 10 dB at each port at the tuned frequency. This tunable property is controlled by the varactor diodes added at the input and output of the FET in TTFNs.
ISSN:	0013-5194 1350-911X 1350-911X
DOI:	10.1049/el.2017.3321