Title :
Analog tunable matching network using integrated thin-film BST capacitors
Author :
Chen, L. Y Vicki ; Forse, Roger ; Chase, D. ; York, Robert A.
Author_Institution :
Agile Mater. & Technol., Goleta, CA, USA
Abstract :
This paper presents an electronically tunable impedance transformer and matching network for RF applications, utilizing thin-film barium strontium titanate (BST) tunable capacitors in an integrated-passive network on sapphire. The impedance transformer can be electronically varied from a 4:1 to 2:1 transformation in a 50 ohm environment. A slight modification of this circuit is shown to provide a match for a highly-reactive integrated antenna allowing the antenna to be used with improved efficiency from 420MHz to 500MHz. ACPR measurements are presented on the latter network showing ACPR1 of >50 dBc at 27 dBm drive power.
Keywords :
barium compounds; capacitors; circuit tuning; impedance matching; passive networks; thin film capacitors; (BaSr)TiO3; 420 to 500 MHz; 50 ohms; ACPR measurements; RF applications; analog tunable matching network; barium strontium titanate; electronically tunable impedance transformer; integrated antenna; integrated thin-film BST capacitors; integrated-passive network; sapphire; tunable capacitors; Barium; Binary search trees; Capacitors; Impedance; Radio frequency; Strontium; Thin film circuits; Titanium compounds; Transistors; Tunable circuits and devices;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1335862
