Electrical Performance Estimations for Shaped Dielectric Lens Antenna with Array Feed
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Electrical Performance Estimations for Shaped Dielectric Lens Antenna with Array FeedAbstract
A shaped dielectric lens antenna with simple array feeds was developed to realize wide-angle beam scanning in car-mounted radar systems. The electrical performance of the dielectric lens antenna has been previously studied through electromagnetic simulations. The authors fabricated a practical dielectric lens antenna operating at 20 GHz and measured its performance. A convenient patch antenna configuration was developed for the array feed. A power divider comprising eight branched microstrip lines was designed in order to achieve precise excitation coefficients for the array feed. Design accuracy of the array feed was confirmed from measured and calculated results for the excitation coefficients and radiated electric field. To determine the wide-angle beam scanning characteristics, the aperture amplitude and phase distributions were estimated numerically using the obtained array radiated electric field. Excellent flat-phase characteristics were confirmed. The commercial electromagnetic simulator FEKO was employed for the numerical simulations. The radiation patterns at a 30° beam scanning angle were measured. Very good agreements between the measured and calculated results were found. Moreover, sufficient antenna gain was confirmed through experiments.
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