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Novel microstrip backward coupler with metamaterial cells for fully planar fabrication techniques

By using a recently proposed approach to synthesize 1D metamaterials in planar circuit technology, compatible with fully planar fabrication techniques, a novel backward coupler has been designed and fabricated. It has been implemented in microstrip technology by means of complementary split‐ring resonators (CSRRs), etched in the ground plane, and series capacitive gaps. This way, we obtain the necessary left‐handed properties for reversing the forward coupling (typical of co‐directional coupled‐line couplers) into backward coupling. The simulation as well as measurement results confirm the enhanced properties of the proposed couplers. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1205–1209, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21579