Title :
Coupled-line metamaterial coupler having co-directional phase but contra-directional power flow
Author :
Islam, R. ; Elek, F. ; Eleftheriades, G.V.
Author_Institution :
Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Ont., Canada
fDate :
3/4/2004 12:00:00 AM
Abstract :
A coupled-line coupler comprising a microstrip line, edge-coupled to a negative-refractive-index line, exhibits co-directional phase but contra-directional Poynting vectors on the lines, leading to backward coupling. A key feature of this coupler is that it can support complex coupled modes. The resulting exponential field decay enables enhanced coupling with moderate line lengths and spacing. An example 3 dB device has been implemented and tested at 3 GHz.
Keywords :
microstrip directional couplers; refractive index; 3 GHz; backward coupling; codirectional phase; contra-directional Poynting vectors; contra-directional power flow; coupled-line metamaterial coupler; enhanced coupling; exponential field decay; microstrip line; moderate line lengths; moderate line spacing; negative-refractive-index line;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20040197
