Original title: Polarization-Aware Rotatable Antennas for RIS-Empowered Symbiotic Radios
Chao Zhang, Ruizhe Long, Boon-Hee Soong, Ying-Chang Liang · September 2026
Wireless signals can weaken dramatically when bouncing off smart reflective surfaces. Engineers can fix this by mechanically rotating antennas to point their beams directly where needed. However, turning an antenna also shifts its polarization, which is the physical orientation of its radio waves. If sending and receiving wave angles do not line up, the signal drops. To solve this, researchers built a system that coordinates antenna rotation, wave polarization, digital beam direction, and surface reflections all at once. By doing so, the setup captures directional power while keeping wave angles matched. The team tested this method in simulations against standard setups with fixed or polarization-blind antennas. They found that their approach sharply cuts the radio transmit power needed to share data. Two simplified versions also cut equipment complexity while matching this strong performance.
Imagine trying to light a dark hallway with a flashlight. If you aim the flashlight straight, the light might not reach all corners, so turning it helps point the light better. But if the flashlight has a polarized lens, turning it can also block light from passing through polarized glasses people are wearing. In this paper, the system adjusts both the flashlight's direction and the lens polarization together to light the hallway effectively without wasting battery.
This work helps wireless networks use less power by cleverly adjusting antennas and surfaces together. It could lower energy costs and improve signal reliability for everyday users and network operators.
The work is validated through simulations only, and real-world hardware constraints are not fully tested. It assumes idealized conditions for the RIS and antennas, and the proposed low-complexity designs need further practical evaluation.
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Polarization-Aware Rotatable Antennas for RIS-Empowered Symbiotic Radios — Chao Zhang, Ruizhe Long, Boon-Hee Soong et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.