A Phase Retrieval Method with Probe-Positioning Error Compensation for Phaseless Near-Field Measurements

Yoshiki SUGIMOTO  Hiroyuki ARAI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E104-B   No.1   pp.55-63
Publication Date: 2021/01/01
Publicized: 2020/07/14
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3264
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
near-field measurement,  phaseless measurement,  far-field estimation,  probe-positioning errors,  error compensation,  

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Summary: 
The phaseless antenna measurement technique is advantageous for high-frequency near-field measurements in which the uncertainty of the measured phase is a problem. In the phaseless measurement, which is expected to be used in the frequency band with a short wavelength, a slight positional deviation error of the probe greatly deteriorates the measurement result. This paper proposes a phase retrieval method that can compensate the measurement errors caused by misalignment of a probe and its jig. And this paper proposes a far-field estimation method by phase resurrection that incorporated the compensation techniques. We find that the positioning errors are due to the random errors occurring at each measurement point because of minute vibrations of the probe; in addition, we determine that the stationary depth errors occurring at each measurement surface as errors caused by improper setting of the probe jig. The random positioning error is eliminated by adding a low-pass filter in wavenumber space, and the depth positioning error is iteratively compensated on the basis of the relative residual obtained in each plane. The validity of the proposed method is demonstrated by estimating the far-field patterns using the results from numerical simulations, and is also demonstrated using measurement data with probe-positioning error. The proposed method can reduce the probe-positioning error and improve the far-field estimation accuracy by more over than 10 dB.