An AMC-based crossed dipole antenna with semi-circular arms for broadside radiation

Rachita Tripathy, K. Murali, Sagi Sravan Kumar, P. Sajith and Situ Rani Patre

Journal of Electromagnetic Waves and Applications, 2025, vol. 39, issue 13, 1571-1587

Abstract: This paper presents an artificial magnetic conductor (AMC)-based crossed dipole antenna (CDA) for right-hand circular polarization (RHCP) and broadside radiation at 2.45 GHz. The proposed antenna comprises a pair of semi-circular planar dipole arms where orthogonal arms are connected using quarter-wavelength rings on both sides of the substrate. The antenna is excited using a single probe feed, and quarter-wave rings maintain a 90° phase shift between orthogonal arms for circular polarization. The AMC surface having square patches is amalgamated with a proposed CDAto realize broadside radiation with higher gain, smaller antenna and low profile compared to a cavity-backed CDA. The proposed AMC-based CDA with a size of 1.06λo × 1.06λo × 0.09λo achieves an impedance bandwidth of 40.7% (2.09-3.16) GHz, an axial ratio bandwidth of 9.21% (2.38-2.61) GHz and broadside gain higher than 7.0 dBic over CP band. The designed antenna is suitable for 2.45 GHz ISM band and S-band satellite applications.

Date: 2025
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DOI: 10.1080/09205071.2025.2524395

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