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A compact dual-band D-CRLH-based antenna with self-isolation functionality

Published online by Cambridge University Press:  14 May 2021

Mahmoud A. Abdalla*
Affiliation:
Electronic Engineering Department, Military Technical College Cairo, Cairo, Egypt
Mohamed El Atrash
Affiliation:
Electrical Systems Engineering Department, October University for Modern Sciences and Arts, Giza, Egypt
Ahmed A. Abdel Aziz
Affiliation:
Electronic Engineering Department, Military Technical College Cairo, Cairo, Egypt
Mohamed I. Abdelnaser
Affiliation:
Electronic Engineering Department, Military Technical College Cairo, Cairo, Egypt
*
Author for correspondence: Mahmoud A. Abdalla, E-mail: maaabdalla@ieee.org

Abstract

This paper presents a compact dual-band filtering antenna without extra employing of filter structures. The antenna is designed using a planar dual-composite right/left-handed (D-CRLH) transmission line unit cell, where the filtering function is achieved through current cancellation between the D-CRLH resonators. The antenna is designed to function at 3.0 and 5.1 GHz, which can serve different WLAN applications. The antenna is a co-planar waveguide fed with a very compact size of only 30 × 16 mm2. Compared to the conventional patch antenna, the antenna size is only 17% at 3.0 GHz and 31% at 5.1 GHz. Despite the small size, the antenna preserves a good omni-directional radiation pattern at the two resonant frequencies with a measured realized gain of 2 and 2.7 dB, respectively. At the stopband in-between the two resonant bands, the reflection coefficient is almost 0 dB at 4.25 GHz and complete non-radiation is proved with a −11 dB measured realized gain. The different antenna filtering functions are verified by full-wave simulation and measurements.

Type
Antenna Design, Modeling and Measurements
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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