Title :
Varactor-Tuned Dual-Band Quadrature Hybrid Coupler
Author :
Djoumessi, Erick Emmanuel ; Marsan, Eric ; Caloz, Christophe ; Chaker, Mohamed ; Wu, Ke
Author_Institution :
Poly-Grames Res. Center, Ecole Polytech. de Montreal, Que.
Abstract :
A tunable dual-band quadrature hybrid coupler for mobile GSM bands (900 and 1800MHz) is proposed and characterized. The structure is composed of four quarter-wavelength sections at a frequency located between the two operating frequencies and two pairs of open-ended stubs. Frequency tuning is achieved by modifying the electrical length of the open-ended stubs with varactor-diode capacitors. A dual-band tunability of 33% and 10% is obtained for the first and the second bands, respectively
Keywords :
3G mobile communication; cellular radio; varactors; waveguide couplers; 1800 MHz; 900 MHz; frequency tuning; mobile GSM bands; open-ended stubs; tunable dual-band quadrature hybrid coupler; varactor diode; Capacitors; Couplings; Diodes; Dual band; Frequency; GSM; Impedance; Transmission lines; Tuning; Varactors; Dual-band operation; GSM bands; quadrature hybrid coupler; tunability; varactor diode;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.884905
