Title :
Bandwidth-optimal single shunt-capacitor matching networks for parallel RC loads of Q ≫ 1
Author :
Allen, Wesley N. ; Small, Joshua ; Liu, Xiaoguang ; Peroulis, Dimitrios
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
In this paper we demonstrate an optimized matching network that maximizes the matching bandwidth for parallel RC loads with quality factors greater than unity. The matching network includes a transmission line and a single shunt capacitor. We systematically investigate the dependance of the network´s bandwidth on the impedance and electrical length of the transmission line. Results show that high impedance lines always yield maximum bandwidth for parallel RC loads with Q > 1. A 4.3:1 MEMS varactor-based tunable matching network is measured as a vehicle to demonstrate these results. In particular, we find that up to a two-fold increase in the 10-dB reflection bandwidth is possible by utilizing high impedance lines. Wih a single 4.3:1 MEMS varactor a measured bandwidth of over 136% is obtained.
Keywords :
Q-factor; circuit tuning; impedance matching; micromechanical devices; transmission lines; varactors; MEMS varactor; MEMS varactor-based tunable matching network; electrical length; impedance lines; network bandwidth; optimized matching network; parallel RC loads; quality factors; reflection bandwidth; single shunt capacitor; transmission line; Bandwidth; Capacitors; Impedance; Micromechanical devices; Q factor; Reflection; Transmission line measurements; Transmission lines; Varactors; Vehicles; Impedance matching; microelectromechanical devices; reconfigurable architectures; varactor tuners;
Conference_Titel :
Microwave Conference, 2009. APMC 2009. Asia Pacific
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-2801-4
Electronic_ISBN :
978-1-4244-2802-1
DOI :
10.1109/APMC.2009.5385256
