Planar Multi Notch Band Antenna In-band Gain Enhanced by Epsilon-near-zero Non-absorptive Metasurface

Abstract

This paper presents the design, fabrication, and characterization of a novel single layer nonabsorbing metasurface with a broadband epsilon near zero (ENZ) property and its application in-band gain enhancement of triple notch band ultra-wideband (UWB) antenna. The proposed metasurface is made up of non-resonant metamaterial unit cells consisting of half ring slots in a circular patch on an FR4 dielectric substrate. Metasurface with unit cells arranged in a 2 × 2 lattice pattern is suspended 4 mm above the triple notch band antenna. The transmission and reflection properties of the metamaterial unit cell are analysed and optimised to ensure the coherent transmission from the metasurface. The non-absorbing property of the metasurface results in the minimal loss of electromagnetic waves. The proposed antenna system with metasurface has a size of 28 × 28 × 7.2 mm 3 . The measured results of fabricated antenna are compared with the simulated ones and are in good match. The results show that the gain of the antenna was enhanced by 1.3 dB, 2.8 dB, and 4 dB at 5 GHz, 7 GHz, and 9 GHz, respectively.