An Imaging System for EM Emitting Sources Using a Six-Port Interferometer

Hiroshi HIRAYAMA  Toshiyuki YAKABE  Yoshio KAMI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.12   pp.1885-1891
Publication Date: 2001/12/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on New Technologies in Signal Processing for Electromagnetic-wave Sensing and Imaging)
Category: 
Keyword: 
microwave imaging,  microwave holography,  six-port interferometer,  EMC,  

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Summary: 
A Fourier-optics based imaging system for electromagnetic interference (EMI) sources is presented. It is necessary to decrease undesired emissions in order to meet EMI requirements. To investigate this problem, a visualization of electromagnetic (EM) emitting fields is very useful. In this paper, we propose a passive imaging system of EM emitting fields based on Fourier optics. Amplitude and phase values of diffracted fields on an entrance pupil are acquired by using a six-port interferometer. The measured EM fields are then processed on a computer, and an image is retrieved using an inverse Fresnel transform. Experiments are presented, which demonstrate the potential of the proposed method. The proposed system is useful not only in the field of electromagnetic compatibility (EMC), but also for scientific elucidation to discuss the optics and microwave theory of the same viewpoint.