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A novel approach for the analysis and optimal design of a spherical lens antenna (SLA) with practical feed model (PFM) is proposed. The vector spherical wave function expansions (VSWE) combined with differential evolution (DE) algorithm is adopted for the optimal design of SLAs. The near-field aperture distributions of the dielectric loaded horn feed (Ku band) and the corrugated horn feed (Ka band) were obtained using the full wave simulation and were then taken into account in the DE optimization. The radiation characteristics of an optimized 650mm 2-layer SLA are presented and compared to simulation results. Good agreement is obtained. By substituting these optimal structural parameters of SLA into the corresponding hemispherical lens antenna (HLA), the gain of HLA can be readily predicted.
Date of Conference: 3-8 July 2011