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A flexible wide band single fed slot antenna with circular polarizing rotated elliptical ground and impulse response

Published online by Cambridge University Press:  01 March 2019

Sherif R. Zahran Open the ORCID record for Sherif R. Zahran [Opens in a new window] ,
Mahmoud A. Abdalla Open the ORCID record for Mahmoud A. Abdalla [Opens in a new window]  and
Abdelhamid Gaafar
Sherif R. Zahran*
Affiliation:
Electronics and Communication Engineering Department, Arab Academy for Science and Technology, 6 bostan el khashab street El Qasr el Ainy, cairo, Cairo, Egypt
Mahmoud A. Abdalla
Affiliation:
Electromagnetic Waves Group, Department of Electronic Engineering, Military Technical College, Kobry Elkobba, El agouza, Giza, Cairo, Cairo, Egypt
Abdelhamid Gaafar
Affiliation:
Electronics and Communication Engineering Department, Arab Academy for Science and Technology, 6 bostan el khashab street El Qasr el Ainy, cairo, Cairo, Egypt
*
Author for correspondence: Sherif R. Zahran, E-mail: sherif.zahran.1991@ieee.org
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Abstract

In this paper, a flexible single fed planar circular polarized slot antenna is proposed for Internet of Things wideband applications. The antenna flexibility is achieved by employing a mechanically bendable liquid crystalline polymer substrate. The overall antenna volume is 50 mm × 42 mm × 0.1 mm. The antenna design uses 45° rotated elliptical ground structure for generating circular polarized radiation over wideband spectrum. Two parametrical analyses targeting the slot ground are introduced in order to achieve the most efficient design. The final antenna design demonstrates a good matching in terms of reflection coefficient (<−10 dB), semi-omnidirectional radiation patterns, average gain of 4 dB, and <3 dB axial ratio over entire frequency band of operation. All antenna parameters are studied in both straight and bent antenna setup scenarios. Good agreement between simulation and measurement results of the antenna parameters are achieved. For both straight and bent antenna scenarios, the antenna receiving functionality in time domain is confirmed by retrieving highly correlated impulse responses.

Keywords

Circular polarized wearable antennaflexible substrateultra wide bandwearable antennawideband antenna
Type
Mini-Special Issue on Flexible Electronics for Wireless Communication
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Issue 9 , November 2019 , pp. 872 - 884
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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