Frequency-Selective Surface Stopband Designed with a Genetic Algorithm for Gain Enhancement of a Broadband Monopole Antenna

• Published in: Journal of Electromagnetic Engineering and Science Vol. 22; no. 3; pp. 236 - 244
• Main Authors: Nguyen, DucDung, Seo, Chulhun
• Format: Journal Article
• Language: English
• Published: 한국전자파학회JEES 01.05.2022; The Korean Institute of Electromagnetic Engineering and Science; 한국전자파학회
• Subjects: broadband; frequency-selective surface; genetic algorithm; monopole antenna; 전자/정보통신공학; Monopole Antenna; Broadband; Frequency-Selective Surface; Genetic Algorithm
• ISSN: 2671-7255; 2671-7263; 2671-7263
• DOI: 10.26866/jees.2022.3.r.82

This paper presents an unusual, high-performance, cost-efficient, wideband frequency-selective surface (FSS) designed with a genetic algorithm (GA) and its effect on the performance of a broadband M-shaped monopole antenna. Each FSS unit cell with the dimensions of 0.2λ0 × 0.2λ0 × 0.01λ0 acts as a stopband filter for a wide bandwidth of 5.5 GHz (105%, 2.6–8.1 GHz). The FSS properties and advantages to antennas were tested via numerical simulations and measurements, respectively. Using the 6×6 array of the designed FSS unit cell as a reflector, the antenna impedance bandwidth improved from 96.1% (3.1–8.1 GHz) to 98.07% (3.3–8.4 GHz), with a center frequency of 5.2 GHz. In addition, the antenna gain improved at the maximum of 7.8 dBi, which was sustained from 9 dBi to 10.1 dBi for the entire bandwidth.