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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 595023, 10 pages
Research Article

Numerical and Experimental Verification of a 3D Quasi-Optical System

1School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
2School of Electric Engineering and Computer Science, Queen Mary University of London, London E1 4NS, UK

Received 26 January 2015; Revised 9 May 2015; Accepted 10 May 2015

Academic Editor: Atsushi Mase

Copyright © 2015 Zejian Lu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A modular and efficient Gaussian beam (GB) analysis method, incorporating frame-based Gabor transformation, GB reflection, and a 3D GB diffraction technique, was developed to analyze both the reflectors and frequency selective surface (FSS) in quasi-optical (QO) system. To validate this analysis method, a 3D dual-channel QO system operating at 183 and 325 GHz was designed and tested. The proposed QO system employs two-layer structure with a FSS of perforated hexagonal array transmitting the 325 GHz signal on the top layer while diverting the 183 GHz signal to the bottom layer. Measured results of the system demonstrate that the agreement can be achieved down to −30 dB signal level for both channels in the far field pattern. The discrepancy between the calculation and measurement is within 2 dB in the main beam region (2.5 times −3 dB beamwidth), verifying the effectiveness and accuracy of the proposed method.