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Reconfigurable RF active bandpass filter with BaxSr1-xTiO3 varactor

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4 Author(s)
Kim, K.B. ; Inf. & Commun. Univ. (ICU), Daejeon ; Yun, T.S. ; Wu, K. ; Park, C.S.

An RF tunable active bandpass filter employing a BaxSr1-xTiO3 (BST) based capacitor is proposed. This filter consists of an active capacitance circuit together with a BST tunable varactor. The active capacitor is made of a field effect transistor that exhibits negative resistance as well as capacitance. BST thin film was deposited by Sol-Gel solution and using the metal-insulator-metal capacitor process. The fabricated capacitor showed capacitance of 2.7-1.5 pF at 1.8 GHz for a maximum applied electric field of 34 V/ mum. The measured second- order active bandpass filter showed bandwidth of 100 MHz, insertion loss of+0.48 dB at 1.8 GHz centre frequency and tuning frequency of 220 MHz with the application of 34 V/ mum.

Published in:

Electronics Letters  (Volume:44 ,  Issue: 2 )