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arXiv · 2610.38377

Is Dual Polarization Always Optimal? Unlocking New Spatial Degrees of Freedom

Adrian Agustin·Xavier Mestre·Carlos Suárez García·Alberto Pellon Sancho
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Abstract

Current wireless communication systems are designed based on channel models obtained under the assumption of far-field operation, where electromagnetic waves can be approximated by a planar wave. In those circumstances, dualpolarized antennas seem to be the optimal solution for maximizing the spectral efficiency. However, the recent research on XLMIMO systems represents a paradigm shift, since communication may take place in the near-field and an additional degree of freedom can be achieved. This work presents a modular, lowcost tripolarized antenna at 2.4 GHz band, that is used to experimentally validate theoretical findings about tripolarized antennas, which are commonly based on orthogonal infinitesimal dipoles. The evaluation is carried out in two indoor scenarios and one outdoor scenario, with transmitter comprising multiple tripolarized antennas and a receiver equipped with a single tripolarized antenna. We show that this type of antenna can increase the number of spatial streams up to three or extend the region where terminals are able to achieve two spatial streams

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Adrian Agustin, Xavier Mestre, Carlos Suárez García, Alberto Pellon Sancho. 2026-10-28. Is Dual Polarization Always Optimal? Unlocking New Spatial Degrees of Freedom. https://arxiv.org/abs/2610.38377

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