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A corrugated G-shaped grounded ring slot antenna for wideband circular polarization

Published online by Cambridge University Press:  23 January 2020

Kapil Saraswat
Affiliation:
Department of Electrical Engineering, IIT Kanpur, Kanpur208016, UP, India
Trivesh Kumar
Affiliation:
Department of Electrical Engineering, IIT Kanpur, Kanpur208016, UP, India
A. R. Harish
Affiliation:
Department of Electrical Engineering, IIT Kanpur, Kanpur208016, UP, India
Corresponding
E-mail address:

Abstract

In this paper, a wideband circularly polarized corrugated G-shaped grounded ring slot antenna is presented. The proposed antenna structure is excited using a coplanar waveguide-fed monopole antenna, which is placed inside a corrugated G-shaped grounded ring. Due to the asymmetry in the ground plane, two orthogonal modes, having equal magnitude and out of phase by 90° are excited, resulting in circular polarization (CP). The generation of the CP in the proposed antenna structure is explained using thin dipole current element approximation. A prototype of the proposed antenna is fabricated and tested. The measured results exhibit a 3 dB axial ratio bandwidth of 37.6% (2.22–3.25 GHz), and reflection coefficient bandwidth (|S11| ≤ −10 dB) of 47.91% (2.13–3.47 GHz). Additionally, the design guidelines are also presented for G-shaped grounded ring slot antennas.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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References

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