Zheng, Y; Lin, B; Loh, T H; Qi, Y (2025) An Improved Method for Quiet Zone Evaluation Using Novel Ultra-Wideband Dual-Polarized Antenna. IEEE Transactions on Antennas and Propagation, 73 (4). pp. 2181-2191.

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Abstract

The quality of the quiet zone (QZ) in an anechoic chamber (AC) is vital for conducting accurate over-the-air testing of emerging wireless products. QZ performance depends on the quality and arrangement of radio-absorbing materials (RAMs) installed on the chamber's inner walls and antenna-to-range interface. Ripple testing serves as a crucial method for assessing QZ performance. In practice, reflections within the AC and the coupling between dual-polarized probes can introduce significant levels of unwanted cross-polarization signals. Although single-polarized antennas are commonly used in ripple testing, they often overlook the impact of cross-polarization on QZ ripples. To address this issue, this paper proposes an improved method for QZ ripple testing using a novel ultra-wideband dual-polarized antenna (NUDA). The proposed NUDA operates between 1 GHz and 12 GHz and achieves a comprehensive performance encompassing ultra-wideband, dual-polarization, wide beamwidth, and low common-mode current. Simultaneously, it overcomes the challenges associated with single-polarized antennas and their common-mode current interference, as well as the narrow beamwidth issue with horn antennas at high frequencies. By introducing a switch and switching the polarization of the NBDA, both the co-polarization and cross-polarization of the QZ can be simultaneously measured at the same location. This provides a more accurate and convenient option for broadband QZ ripple testing. The feasibility of the proposed method has been demonstrated through both simulation and experimental results.

Item Type:	Article
Subjects:	Electromagnetics > Wireless Communications
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1109/TAP.2024.3502916
Last Modified:	24 Sep 2025 13:57
URI:	https://eprintspublications.npl.co.uk/id/eprint/10226