Title :
LH phase shifter using ferroelectric varactors
Author :
Giere, A. ; Damm, Christian ; Scheele, Patrick ; Jakoby, Rolf
Author_Institution :
Inst. of Microwave Eng., Darmstadt Univ. of Technol.
Abstract :
A tunable left handed (LH) transmission line used as continuously tunable phase shifter is presented. Using varactors based on barium-strontium-titanate (BST) thick films, a figure of merit FoM = 29deg /dB has been measured at 2.8 GHz. The bandwidth of the realized circuit using 3 unit cells reached 10%. The agreement of the presented result from simulation and measurement is good, the differences can be explained by tolerances of the used components. Additionally the simulations of a 180deg phase shifter based on the same components for the unit cell is presented. Simulated results of this phase shifter shows a bandwidth of 27% and a FoMmax = 31.5deg /dB
Keywords :
UHF phase shifters; barium compounds; ferroelectric capacitors; metamaterials; strontium compounds; thick films; transmission lines; varactors; 2.8 GHz; barium-strontium-titanate thick films; continuously tunable phase shifter; ferroelectric varactors; figure of merit; left handed phase shifter; tunable left handed transmission line; Bandwidth; Binary search trees; Circuit simulation; Distributed parameter circuits; Ferroelectric materials; Phase shifters; Thick films; Transmission line measurements; Tunable circuits and devices; Varactors;
Conference_Titel :
Radio and Wireless Symposium, 2006 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-9412-7
DOI :
10.1109/RWS.2006.1615180
