Open AccessX‐Band Phased Array Antenna Using Ferroelectric (Ba,Sr)TiO 3 Coplanar Waveguide Phase Shifter
Author(s) -
Moon Seung Eon,
Ryu Han Cheol,
Kwak Min Hwan,
Kim Young Tae,
Lee SuJae,
Kang KwangYong
Publication year - 2005
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.05.0105.0024
Subject(s) - coplanar waveguide , phase shift module , materials science , insertion loss , optoelectronics , phased array , antenna (radio) , impedance matching , optics , return loss , ferroelectricity , transmission line , electrical impedance , electrical engineering , telecommunications , engineering , physics , microwave , dielectric
A phased array antenna was fabricated using four‐element ferroelectric phase shifters with a coplanar waveguide (CPW) transmission line structure based on a Ba0.6Sr0.4TiO3(BST)/MgO structure. Epitaxial BST films were deposited on MgO (001) substrates by pulsed laser deposition. To attain the large differential phase shift and small losses for a ferroelectric CPW phase shifter, an impedance‐matching‐part adding technique between the effective transmission line and connecting cable was used. The return loss and insertion loss for this technique‐adapted BST CPW device were improved with respect to those for a normal BST CPW device. For an X‐band phased array antenna system consisting of ferroelectric BST CPW phase shifters, power divider, dc block, patch antenna, and programmed dc power, the steering beam could be tilted by 15° in either direction.