Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3686615
Title: Coupled microstrip line microwave phase shifter using ferroelectric thin film varactors
Authors: Sheng, S.
Ong, C.K. 
Issue Date: 15-Feb-2012
Source: Sheng, S., Ong, C.K. (2012-02-15). Coupled microstrip line microwave phase shifter using ferroelectric thin film varactors. Journal of Applied Physics 111 (4) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3686615
Abstract: This article presents a coupled microstrip line microwave phase shifter using ferroelectric thin film varactors with parallel plate electrodes integrated on high-resistivity silicon substrate. This design is proposed as a component in low-cost beam scanning phased array antennas. The phase shifter structure consists of coupled microstrip line periodically loaded with eight Ba xSr 1-xTiO 3 (BST) varactors and two planar Marchand baluns. The planar Marchand baluns work as the transformers of odd mode excitation and a transmission stop circuit for even mode excitation as well as the impedance matching networks. A differential phase shift of 45 was obtained with a low dc bias of 20 V at frequency of 9 GHz, which corresponds to a figure of merit of ∼23/dB. These results represent significant progress toward compact size, low loss, and ferroelectric thin film-based phase shifters at room temperature. © 2012 American Institute of Physics.
Source Title: Journal of Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/96122
ISSN: 00218979
DOI: 10.1063/1.3686615
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