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

fYear

2009

fDate

7-12 June 2009

Firstpage

617

Lastpage

620

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2009. MTT '09. IEEE MTT-S International

Conference_Location

Boston, MA

ISSN

0149-645X

Print_ISBN

978-1-4244-2803-8

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2009.5165772

Filename

5165772