Printed high-directivity metamaterial MS/NRI coupled-line coupler for signal monitoring applications
Authors:
- 3 April 2006
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Microwave and Wireless Components Letters
- Vol. 16 (4) , 164-166
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
This publication has 12 references indexed in Scilit:
- Analysis of a finite length microstrip/negative-refractive-index coupled-line coupler2005
- Phase-agile branch-line couplers using metamaterial linesIEEE Microwave and Wireless Components Letters, 2004
- Overcoming the Diffraction Limit with a Planar Left-Handed Transmission-Line LensPhysical Review Letters, 2004
- Coupled-line metamaterial coupler having co-directional phase but contra-directional power flowElectronics Letters, 2004
- A novel mixed conventional microstrip and composite right/left-handed backward-wave directional coupler with broadband and tight coupling characteristicsIEEE Microwave and Wireless Components Letters, 2004
- A planar metamaterial co-directional coupler that couples power backwards2003
- Compact linear lead/lag metamaterial phase shifters for broadband applicationsIEEE Antennas and Wireless Propagation Letters, 2003
- Planar negative refractive index media using periodically L-C loaded transmission linesIEEE Transactions on Microwave Theory and Techniques, 2002
- Experimental verification of backward-wave radiation from a negative refractive index metamaterialJournal of Applied Physics, 2002
- Experimental Verification of a Negative Index of RefractionScience, 2001