Dual-band branch line coupler with large power division ratios

Author

Hsu, Ching-Luh

Author_Institution

Dept. of Electron. Eng., Ta Hwa Inst. of Technol., Hsinchu, Taiwan

fYear

2009

fDate

7-10 Dec. 2009

Firstpage

2088

Lastpage

2091

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/APMC.2009.5385266

Filename

5385266