FILTERING LENS STRUCTURE BASED ON SRRS IN THE LOW THZ BAND

• Published in: Electromagnetic waves (Cambridge, Mass.) Mass.), 2009, Vol.93, p.71-90
• Main Authors: Andres-Garcia, B., Garcia Munoz, Luis Enrique, Gonzalez-Posadas, Vicente, Herraiz-Martínez, F. J., Segovia-Vargas, Daniel
• Format: Article
• Language: English
• ISSN: 1559-8985; 1070-4698; 1559-8985
• DOI: 10.2528/PIER09040105

A filtering lens for conical horns based on Metamaterials is presented. The paper focuses on a millimeter wave application. The metamaterial structure is composed of a printed layer of Split Ring Resonators (SRRs) on a substrate. The structure is used as a superstrate on the horn aperture. When the SRRs are excited, a filter performance arises preventing radiation in the desired frequency bands. Besides the filtering property, also a lens behavior is achieved. In this way larger gain can be achieved in both E and H planes, reducing the 3 dB beamwidth. A 6% -3 dB stop band is achieved from 73.3 GHz to 85.7 GHz. Symmetrisation of the radiation pattern up to 3 dB is accomplished and the focalization effect is achieved by emulating a hyperbolical-plane lens. Thus, a simplified system based on a conical horn can be designed by unifying the filter and lens in one electromagnetic element.