@article {Kim:Volume 56/2003:1058-4587:1107,
	author = "Kim Y-T.",
	author = "Ryu H-C.",
	author = "Kwak M-H.",
	author = "Moon S-E.",
	author = "Lee S-J.",
	author = "Kim S-H.",
	author = "Park J-S.",
	author = "Han S-K.",
	title = "Optimum Reflection-Type Phase Shifter Using (Ba,Sr)TiO3 Thin Film",
	journal = "Integrated Ferroelectrics",
	volume = "56",
	year = "Volume 56/2003",
	abstract = "In this paper, in order to obtain a large differential phase shift with a little change in applied voltage, a ferroelectric reflective load circuit has been designed on top of barium strontium titanate (Ba,Sr)TiO<SUB>3</SUB> [BST] thin film. The design of the ferroelectric reflection-type phase shifter is based on a reflection theory of terminating circuit, which has a reflection-type analogue phase shifter with two ports terminated in symmetric phase-controllable reflective networks. To achieve large amounts of phase shift in low bias-voltage range, the effects of change of capacitance and transmission line connected with two coupled ports of a 3-dB 90&#176; branch-line hybrid coupler have been investigated. A large phase shift with a small capacitance change in the parallel terminating circuit has been demonstrated in the paper.",
	pages = "1107-1114(8)",
	url = "http://www.ingentaconnect.com/content/tandf/ginf/2003/00000056/00000001/art00013"
}