An Enhanced Spatial-Domain Probe Compensation Method With SRM for Near-Field Scanning

In the near-field scanning technique, the near-field probe is the key sensor and the probe output is related to the probe receiving characteristics and the field distribution. Therefore, it is necessary to compensate the probe output distribution to the real field distribution based on the probe receiving characteristics. There are two main probe compensation methods: the spectral-domain method and the spatial-domain method. Due to the use of the 2-D Fourier transform algorithm, the spectral probe compensation method does not work well when the probe output spatial distribution is truncated while fields are not negligible. In this article, we present an enhanced spatial probe compensation technique for electromagnetic near-field scanning. This method enables the direct compensation of the truncated probe output, resulting in a more accurate field distribution. To overcome the poor constraint ability of traditional spatial probe compensation methods, electromagnetic constraints are introduced to transform the probe compensation problem into a source reconstruction problem. The effectiveness of the proposed method is verified by the numerical example and laboratory experiments.