Title :
A Compact Dual-Band 90° Coupler With Coupled-Line Sections
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of HongKong, Shatin, China
Abstract :
A new dual-band 90° coupler using coupled transmission lines is proposed in this paper. As the coupler consists of only three quarter-wave coupled-line sections, it occupies less circuit area as compared to other existing dual-band branch-line couplers. A desired dual-band operation can be achieved by proper design of the coupling level for those coupled-line sections. Moreover, the coupler´s configuration contains a degree of freedom so that its design is “customizable,” allowing itself to be conveniently realized on a variety of circuit and substrate technologies. As a result, it is suitable for use in many practical applications.
Keywords :
microstrip couplers; microstrip lines; waveguide couplers; compact dual-band 90° coupler; coupled transmission line; three quarter-wave coupled-line section; Bandwidth; Couplers; Couplings; Dual band; Impedance; Microstrip; Prototypes; Branch-line couplers; coupled-line couplers; dual-band components; microstrip lines;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2011.2160199
