Tang, Y; Wang, Z; Chen, X; Loh, T H; Fan, T H; Miao, J; Gao, S (2023) Near Field Linear Array Calibration Based on Extrapolation of Measured Complex Signals. IEEE Transactions on Antennas and Propagation, 71 (10). pp. 8407-8412.

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Abstract

Rigorous phased array calibration is critical to ensure accurate array radiation performance. This paper presents a novel phased array calibration method based on extrapolation of the measured complex signals under near field condition. The proposed method enables calibration of large aperture phased arrays with a small probe array aperture. A single probe antenna is employed and moved in a sparse grid to obtain the amplitude and phase of the electric field over a planar region close to half of the aperture of an antenna under test (AUT). The operating principle is to fit and extrapolate the amplitude and phase of the measured complex signals, which are envisaged to have parabolas shape, after compensation using the free space transfer function. The amplitude of the initial excitation is calculated by the average of parabolic difference, while the initial phase excitation is obtained by the vertices of parabolas. A 23 elements uniform linear array (ULA) operating at 2.6 GHz is calibrated in near field using the proposed method with a 1.55 m measurement range and a probe planar scanning aperture of 1 m (i.e. no larger than half of the ULA aperture). From the obtained results, a ±0.41 dB in amplitude and ±5.7o in phase calibration accuracy is achieved respectively, demonstrating the effectiveness of the proposed method.

Item Type:	Article
Subjects:	Electromagnetics > Wireless Communications
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1109/TAP.2023.3307474
Last Modified:	26 Mar 2024 14:38
URI:	https://eprintspublications.npl.co.uk/id/eprint/9951