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Closed-form Jones matrix of dual-polarized inverted-vee dipole antennas over lossy ground

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Authors
Baelemans, R.
Sutinjo, Adrian
Hall, Peter
Smolders, A.
Arts, M.
De Lera Acedo, E.
Date
2017
Type
Journal Article

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Baelemans, R. and Sutinjo, A. and Hall, P. and Smolders, A. and Arts, M. and De Lera Acedo, E. 2017. Closed-form Jones matrix of dual-polarized inverted-vee dipole antennas over lossy ground. IEEE Transactions on Antennas and Propagation. 65 (1): pp. 26-35.
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IEEE Transactions on Antennas and Propagation
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Department of Electrical and Computer Engineering
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Abstract

This paper presents a closed-form expression for the Jones matrix of a dual-polarized inverted-vee dipole antenna based on the Lorentz reciprocity theorem and the basic rules of electromagnetic refraction. The expression is used to determine the intrinsic cross-polarization ratio (IXR) as a function of droop angle, position of the source in the sky, antenna height, frequency, and reflection coefficient of the underlying ground. The expression is verified using full-wave simulations with a method-of-moments solver, showing very good agreement. It explains the increase in the IXR when the antenna is placed over a perfect electric ground plane. This result is used to explain the polarization properties of the Square Kilometre Array Log-periodic Antenna. Through the LOw-Frequency ARray Low-Band Antenna (LOFAR-LBA), the importance of the size of the ground plane is explained. Finally, design consideration for high polarization purity antennas is discussed.