A new accurate design method for millimeter-wave homogeneous dielectric substrate lens antennas of arbitrary shape

摘要: The synthesis and the optimization of three-dimensional (3-D) lens antennas, consisting homogeneous dielectric lenses arbitrary shape fed by printed sources, are studied theoretically experimentally at millimeter(mm)-wave frequencies. aim procedure is to find a profile that transforms radiation pattern primary feed into desired amplitude shaped output pattern. This problem has been previously applied for reflectors. As far as we know, propose, first time, adapt implement it design substrate antennas. inverse scattering solved in two steps. In one, geometry 3-D rigorously derived using geometrical optics (GO) principles. resulting second-order partial-differential equation strongly nonlinear Monge-Ampe/spl grave/re (M.A) type. iterative algorithm implemented solve described detail. Then, surface combined with an analysis kernel based on physical (PO) performed order comply prescribed Our algorithms successfully validated antenna radiating asymmetric Gaussian 58.5 GHz whose half-power beamwidth equals 10/spl deg/ H plane 30/spl E plane. illuminated microstrip 2/spl times/2 patch array. Two prototypes have manufactured Teflon. Before optimization, measured patterns very good agreement predicted ones; nevertheless, -12 dB side lobes oscillations appearing main lobe evidence strong difference between patterns. discrepancy significantly reduced optimized lens.