Title :
Composite right/left handed transmission line phase shifter using ferroelectric varactors
Author :
Kuylenstierna, D. ; Vorobiev, Alexey ; Linner, P. ; Gevorgian, S.
Author_Institution :
Dept. of Microtechnology & Nanoscience, Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
4/1/2006 12:00:00 AM
Abstract :
A composite right/left handed (CRLH) transmission line (TL) phase shifter, using ferroelectric (Ba/sub 0.25/Sr/sub 0.75/TiO3) varactors as tunable element, is presented for the first time. It is theoretically and experimentally demonstrated how the unique features of CRLH TLs, enables a differential phase shift with flat frequency dependence around the center frequency. The experimental prototype is a coplanar design integrated on a high resistive Si substrate. It includes four CRLH T-unit cells and has a physical length of 3850μm. The ferroelectric varactors are realized in parallel plate version. Under 15-V dc bias applied over each varactor, the differential phase shift is flat around 17GHz and has an absolute value of 50/spl deg/.
Keywords :
ferroelectric devices; metamaterials; microwave phase shifters; transmission line theory; varactors; 3850 micron; Ba/sub 0.25/Sr/sub 0.75/TiO/sub 3/; CRLH transmission line phase shifter; composite right-left handed materials; ferroelectric varactors; Cutoff frequency; Energy consumption; Ferroelectric materials; Frequency dependence; Phase shifters; Power transmission lines; Transmission line theory; Transmission lines; Tunable circuits and devices; Varactors; Composite right/left-handed (CRLH); ferroelectric; phase shifter; tunable;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.872145
