Title :
Variable ZC transmission line and its application to a tunable impedance transformer
Author :
Chun, Young-Hoon ; Hong, Jia-Sheng
Author_Institution :
Dept. of Electr., Electron. & Comput. Eng., Heriot-Watt Univ., Edinburgh, UK
Abstract :
This paper presents a new type of a transmission line with the variable characteristic impedance which is electronically tuned by RF switches or varactors. Furthermore, a tunable impedance transformer, which can be used to enhance the impedance matching between an antenna and RF front-end, using this variable ZC transmission line is fabricated and measured. By means of inserting a third metal between signal and ground metal, we can adjust the equivalent capacitance or inductance per unit length, which makes the novel transmission line have different characteristic impedances. The impedance transformer can be electronically varied from 10 to 65 Ω in a 50 Ω environment at the center frequency of 900 MHz.
Keywords :
impedance convertors; impedance matching; microwave switches; transmission lines; tuning; varactors; 900 MHz; RF switches; ZC transmission line; equivalent capacitance; impedance matching; tunable impedance transformer; varactors; variable characteristic impedance; Antenna measurements; Capacitance; Impedance matching; Impedance measurement; Inductance; Radio frequency; Switches; Transmission line antennas; Transmission line measurements; Varactors;
Conference_Titel :
Microwave Conference, 2005 European
Print_ISBN :
2-9600551-2-8
DOI :
10.1109/EUMC.2005.1610070