Title :
Printed high-directivity metamaterial MS/NRI coupled-line coupler for signal monitoring applications
Author :
Islam, Rubaiyat ; Eleftheriades, George V.
Author_Institution :
Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
fDate :
4/1/2006 12:00:00 AM
Abstract :
Using the general coupled-mode formulation, it is shown that the interaction between a regular transmission line and a negative-refractive-index (NRI) line leads to complex coupled modes. Specifically the coupling between a regular microstrip (MS) and a NRI line is analyzed and the theory reveals conditions giving rise to high directivity. Experimental results are presented for a fully printed MS/NRI coupled-line coupler exhibiting a coupling level of -27dB, isolation of -72dB, and directivity of 45dB at the design frequency of 2.04GHz. Such low-coupling levels but high-directivity couplers are well suited for signal monitoring and instrumentation applications.
Keywords :
coupled transmission lines; metamaterials; microstrip lines; microwave materials; waveguide couplers; 2.04 GHz; coupled-mode formulation; high-directivity coupler; metamaterials; microstrip line; negative refractive index line; signal monitoring; transmission line; Couplings; Frequency; Instruments; Metamaterials; Microstrip; Monitoring; Propagation constant; Propagation losses; Transmission line theory; Tuning; Complex modes; high-directivity coupler; metamaterials; reflectometer; signal monitors;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.872146
