Gain enhancement of the Vivaldi antenna with band notch characteristics using zero-index metamaterial

Abstract

In this letter, a tapered slot ultrawide band (UWB) Vivaldi antenna with enhanced gain having band notch characteristics in the WLAN/WiMAX band is presented. In this framework, a reference tapered slot Vivaldi antenna is first designed for UWB operation that is, 3.1–10.6 GHz using the standard procedure. The band‐notch operation at 4.8 GHz is achieved with the help of especially designed complementary split ring resonator (CSRR) cell placed near the excitation point of the antenna. Further, the gain of the designed antenna is enhanced substantially with the help of anisotropic zero index metamaterial (AZIM) cells, which are optimized and positioned on the substrate in a particular fashion. In order to check the novelty of the design procedure, three distinct Vivaldi structures are fabricated and tested. Experimental data show quite good agreement with the simulated results. As the proposed antenna can minimize the electromagnetic interference (EMI) caused by the IEEE 802.11 WLAN/WiMAX standards, it can be used more efficiently in the UWB frequency band. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:233–238, 2016

Sub-Surface Microwave Imaging Using Four-Slot Vivaldi Antenna with Improved Directivity

“…The proposed four-slot Vivaldi structure is responsible for almost uniform field distribution at the aperture which shows high directivity as compared to the earlier proposed ZIM loaded Vivaldi antenna [8] and double-slot antenna [10] of approximately the same size. The design methodology of the multi slot antenna is chosen in such a way that the beam splitting at higher frequency can be avoided, which results into the directivity improvement from 7 dBi to 13.5 dBi as compared to the conventional ZIM loaded TSVA [2] with same dimension over the frequency range of 2-11 GHz.…”

“…However, one of the bottlenecks of the conventional Vivaldi antenna has been its relatively low directivity. In order to improve its far field characteristic such as the directivity, various methods have been proposed employing array design [5]- [7], loading zero index metamaterials (ZIM) [8]- [10], placing dielectric lens in front of the antenna [11], employing a director at the aperture of the antenna [12], a palm tree approach [13] etc. Recently, a double-slot Vivaldi antenna has been proposed to improve the directivity by certain factor [14].…”

Gain Enhancement of a Millimeter Wave Antipodal Vivaldi Antenna by Epsilon-Near-Zero Metamaterial

“…Two dimensions, a and b, are varied to tune this unit cell for the required operating frequency range. These cells are periodic in the x-direction, and the proposed epsilon near zero is obtained in the y-direction [26]. This unit cell corresponds to an equivalent LC circuit.…”

Anisotropic Zero Index Material: A Method of Reducing the Footprint of Vivaldi Antennas in the Uhf Range

“…[13]. A recent publication [14] describes a similar application, with a different design for the unit cell and a different operation frequency range. As depicted in Fig.…”