A CPW-fed compact square slot antenna with wideband circularly polarized for C-band application

Nader Felegari | Sajad Zafari | Narges Malekpour | Hamidreza Hassani

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=159291
Date :  2020/12/14
Publish in :    Microwave and Optical Technology Letters
DOI :  https://doi.org/10.1002/mop.32701
Link :  http://dx.doi.org/10.1002/mop.32701
Keywords :circularly polarized, compact antenna, CPW feed, slot antenna, wideband

Abstract :

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This paper presents a compact wideband circularly-polarized square slot antenna (CPSSA). The antenna is a coplanar waveguide feed structure with three T-stubs toward the slot center and one semi-circle tuning stub was etched to the feed line and modified inverted L-shaped strips around the corners of the ground. Moreover, two spiral slots were loaded in the ground plane for exciting currents in a different direc-tion. A prototype of the designed antenna is fabri-cated and measured to confirm the simulation results. A reasonably good agreement between the measured and simulated results in terms of the reflection coeffi-cient −10 dB and axial ratio are achieved. The 3-dB axial ratio bandwidth achieved by the combination is from 4.35 to 8.15 GHz (60, measured). The designed CPSSA has a compact size of 0.57λₒ × 0.57λₒ × 0.0116λₒ at the center frequency and fabri-catedontheFR4substrate.