Coupled microstrip line microwave phase shifter using ferroelectric thin film varactors

被引：14

作者：

Sheng, Su ^{[1
]}

Ong, C. K. ^{[1
]}

机构：

[1] Natl Univ Singapore, Ctr Superconducting & Magnet Mat, Dept Phys, Singapore 117542, Singapore

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 04期

关键词：

DIELECTRIC-PROPERTIES;

D O I：

10.1063/1.3686615

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 BaxSr1-xTiO3 (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 degrees was obtained with a low dc bias of 20 V at frequency of 9 GHz, which corresponds to a figure of merit of similar to 23 degrees/dB. These results represent significant progress toward compact size, low loss, and ferroelectric thin film-based phase shifters at room temperature. (C) 2012 American Institute of Physics. [doi:10.1063/1.3686615]

引用

页数：5