Title :
A compact coupled-line forward coupler using composite right-/left-handed transmission lines
Author :
Hirota, Akimichi ; Tahara, Yukihiro ; Yoneda, Naofumi
Author_Institution :
Mitsubishi Electr. Corp., Kamakura, Japan
Abstract :
A novel coupled-line forward coupler using composite right-/left-handed transmission lines (CRLH TLs) is presented. Enhanced forward coupling is achieved with the coupled CRLH TLs which have a considerable difference of effective phase constants in the even/odd modes. A circuit model and a microstrip implementation of the proposed CRLH forward coupler are described. The 10-dB forward coupler is simulated and experimentally demonstrated in the S-band. Its coupled-line length is significantly reduced to half of the conventional right-handed forward coupler with the same coupling. The experimental results correspond with the simulated results.
Keywords :
coupled circuits; integrated circuit modelling; metamaterials; microstrip directional couplers; microstrip lines; CRLH forward coupler; S-band; circuit model; compact coupled-line forward coupler; composite right-/left-handed transmission lines; coupled-line length; directional coupler; even/odd mode; microstrip line; phase constant; Capacitance; Circuit simulation; Coupling circuits; Directional couplers; Distributed parameter circuits; Frequency; Impedance; Microstrip; Photonic band gap; Transmission lines; CRLH Transmission Line; Forward Coupler; Multilayer substrate;
Conference_Titel :
Microwave Symposium Digest, 2009. MTT '09. IEEE MTT-S International
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-2803-8
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2009.5165772
