Application of composite right/left-handed half-mode substrate integrated waveguide to the design of a dual-band rat-race coupler

Author

Dong, Yuandan ; Itoh, Tatsuo

Author_Institution

Dept. of Electr. Eng., Univ. of California, Los Angeles, Los Angeles, CA, USA

fYear

2010

fDate

23-28 May 2010

Firstpage

712

Lastpage

715

Abstract

Based on the composite right/left-handed (CRLH) half-mode substrate integrated waveguide (HMSIW) transmission line (TL), a dual-band rat-race coupler is implemented and presented in this paper. The CRLH behavior of the HMSIW TL is obtained by etching the interdigital slot on the waveguide surface. It supports the propagation of the backward-wave below the characteristic waveguide cutoff frequency in the left-handed (LH) region and the forward-wave in the right-handed (RH) region. This attribute (phase advance and phase delay at different frequencies) is applied to the design of a dual-band rat-race coupler. Equivalent circuit and dispersion diagram are discussed. Theory and synthesis procedures are provided. Couplers based on the conventional HMSIW and CRLH HMSIW are designed, fabricated and compared. Their 180°-out-of-phase and in-phase operations are verified. Good agreement between the simulation and measurement is observed.

Keywords

equivalent circuits; etching; substrate integrated waveguides; transmission lines; waveguide couplers; composite right-left-handed half-mode substrate integrated waveguide; dispersion diagram; dual-band rat-race coupler; equivalent circuit; interdigital slot; transmission lines; Circuit simulation; Circuit synthesis; Coupling circuits; Cutoff frequency; Delay; Dual band; Equivalent circuits; Etching; Surface waves; Transmission line theory; Composite right/left-handed (CRLH); dual-band; half-mode substrate integrated waveguide (HMSIW); rat-race coupler;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International

Conference_Location

Anaheim, CA

ISSN

0149-645X

Print_ISBN

978-1-4244-6056-4

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2010.5516735

Filename

5516735