Title :
Dual-band branch line coupler with large power division ratios
Author_Institution :
Dept. of Electron. Eng., Ta Hwa Inst. of Technol., Hsinchu, Taiwan
Abstract :
Design of dual-band branch line couplers with large power division ratios is proposed. Large power division ratio is achieved by replacing the conventional branch lines with shorted parallel-coupled line sections. For dual-band operation, open stubs are attached to the branch lines at the connecting nodes in the circuit. Design equations incorporating arbitrary power division ratios are formulated by imitating the quarter-wave branch-lines at the two designated frequencies with different characteristic impedances. A microstrip coupler operating at 2.45/5.2 GHz with 20/15 dB power division ratios is designed, fabricated and tested to validate the theory. Good agreement is obtained between experiment and simulation results.
Keywords :
microstrip couplers; waveguide couplers; characteristic impedances; circuit connecting nodes; dual-band branch line coupler; frequency 2.45 GHz to 5.2 GHz; microstrip coupler; open stubs; power division ratios; shorted parallel-coupled line sections; Circuit simulation; Coupling circuits; Design engineering; Dual band; Equations; Impedance; Microstrip; Power transmission lines; Radio frequency; Transmission line theory; Branch line coupler; coupled-line; directional coupler; dual-band; hybrid;
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.2009.5385266
