Title :
A novel compact dual-band branch-line coupler
Author :
Lin, Feng ; Chu, Qing-Xin
Author_Institution :
Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China
Abstract :
A novel compact dual-band branch-line coupler is proposed, which consists of four E-shaped dual-band transmission lines. The even-odd mode method is adopted to obtain the input admittance of the E-shaped transmission line. Letting the admittance matrix of the E-shaped transmission line and the conventional quarter-wavelength transmission line be identical in two frequencies, then the dual-band coupler is obtained. For verification, a 3-dB microstrip coupler operating at 900 and 2000 MHz is fabricated and measured. Simulated and measured results are in good agreement.
Keywords :
UHF couplers; microstrip couplers; E-shaped dual-band transmission lines; admittance matrix; compact dual-band branch-line coupler; conventional quarter-wavelength transmission line; even-odd mode method; frequency 2000 MHz; frequency 900 MHz; microstrip coupler; Admittance; Coupling circuits; Dual band; Equations; Frequency; Impedance; Microstrip; Phase transformers; Transmission line matrix methods; Transmission lines; Couplers; compact; dual-band;
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.2009.5385240
