Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 56, Issue 2, Pages 485-492Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2007.915432
Keywords
boundary integral equations (BIEs); dielectric lens antennas; geometrical optics (GO); physical optics (PO)
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We assess the accuracy and relevance of the numerical algorithms based on the principles of geometrical optics. (GO) and physical optics (PO) in the analysis of reduced-size homogeneous dielectric lenses prone to behave as open resonators. As a benchmark solution, we use the Muller boundary integral equations (MBIEs) discretized with trigonometric Galerkin scheme that has guaranteed and fast convergence as well as controllable accuracy. The lens cross-section is chosen typical for practical applications, namely an extended hemiellipse whose eccentricity satisfies the GO focusing condition. The analysis concerns homogeneous lenses made of rexolite, fused quartz, and silicon with the size varying between 3 and 20 wavelengths in free space. We consider the 2-D case with both E- and H-polarized plane waves under normal and oblique incidence, and compare characteristics of the near fields.
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