Electrically-Small Shaped Integrated Lens Antennas: A Study of Feasibility in $Q$ -Band
作者： Barbara Chantraine-Bares , Ronan Sauleau
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摘要: Integrated lens antennas (ILAs) are essentially high-gain (sub)millimeter-wave radiating structures. They often have a moderate (or even poor) aperture efficiency because their design rules generally based on high-frequency methods of analysis with no advanced optimization procedures. From the proposed classification ILA types as function efficiency, we demonstrate feasibility designing compact arbitrarily-shaped ILAs high radiation and efficiencies, which has never been addressed to our best knowledge. The strategy consists local iterative trial shapes that analyzed spherical wave expansion (SWE) primary fields physical optics (PO) method. This approach assumes feed currents not modified by irregular profile dielectric contrast at interface; in addition, influence internal reflections possible indirect paths is neglected. methodology thus restricted low-permittivity lenses. SWE/PO algorithms gradient-based procedures validated numerically Q-band considering two peculiar ILAs. first example (designed characterized experimentally previous contribution) used relevant test-case order validate method analysis. second prototype Teflon shaped whose diameter height equal 1.8timeslambda0 1.5timeslambda0, respectively. antenna shown 92% 70% efficiency. Although purely numerical, these data among highest values reported literature. confirmed FDTD simulations
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