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|Title:||Coupled microstrip line microwave phase shifter using ferroelectric thin film varactors|
|Citation:||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|
|Appears in Collections:||Staff Publications|
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