Title :
Phase-agile branch-line couplers using metamaterial lines
Author :
Islam, Rubaiyat ; Eleftheriades, George V.
Author_Institution :
Univ. of Toronto, Ont., Canada
fDate :
7/1/2004 12:00:00 AM
Abstract :
Two branch-line couplers are introduced that utilize a combination of regular microstrip (MS) and negative-refractive-index (NRI) lines. Interesting phase compensation (0° phase shift) at the output port and a choice of ±90° phase shift at the through port, with respect to the input, are possible. On the other hand, one of the dimensions of the coupler is significantly reduced, compared to a corresponding conventional branch-line coupler, but without any bandwidth degradation.
Keywords :
microstrip couplers; microstrip lines; backward-wave lines; bandwidth degradation; left-handed media; metamaterial lines; microstrip lines; negative refraction; negative-refractive-index lines; phase compensation; phase shift; phase-agile branch-line couplers; through port; Bandwidth; Couplers; Degradation; Equivalent circuits; Metamaterials; Microstrip; Permeability; Permittivity; Refractive index; Scattering parameters; Backward-wave lines; left-handed media; metamaterials; negative refraction; phase compensation;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2004.829277
