A. Marcotegui

Metamaterial microstrip backward couplers for fully planar fabrication techniques

A novel approach to obtain metamaterials in microwave planar circuit technology compatible with fully planar fabrication techniques is described. Microstrip lines with dual split ring resonators (SRRs) etched on the ground plane along with series capacitive gaps in the upper conductor strip are considered. The occurrence of left-handed (metamaterial) wave propagation in such media is demonstrated. Then, a metamaterial coupler made of a regular microstrip line and a left-handed microstrip line is examined. Co-directional traveling waves result in contra-directional Poynting vectors on the lines thus leading to power being coupled backwards. Backward coupling much tighter than that achievable with traditional (also backward) /spl lambda//4-couplers of the same inter-line distance is reported.

Subwavelength hole arrays, and split ring resonators based metasurfaces for frequency selective surfaces

This paper shows several possibilities for the design of metasurfaces based on etching holes in metallic plates, making corrugations surrounding an slit on the plate, and by introducing the concept of complementary split ring resonator. Enhanced transmission phenomena has been experimentally demonstrated in all three cases.

Implementation of effective negative ɛ transmission line in stripline technology

In this work, a negative-ϵ equivalent response medium is proposed in stripline technology. To achieve band rejection behaviour, Complementary Split Ring Resonators (CSRR) are placed in the central conductor strip of a conventional stripline planar transmission line. Due to strong normal electric field incidence, adequate excitation of the stripline is achieved, leading to band rejection in the quasi-static resonance frequency of the CSRR particles. Full wave simulation results from our own FDTD code and measurement results are presented, showing good agreement.