Abstract

A low-cost 77 GHz spherical lens antenna has been developed for mobile applications. The antenna system consists of a 5 cm spherical Teflon lens which is fed by an endfire tapered slot antenna on a 127 μm-thick Duroid™ substrate. The measured patterns result in symmetrical diffraction limited E and H-plane patterns with a 3-dB beamwidth of 5.5°, a sidelobe level below -20 dB and a crosspolarization level of -19 dB. The calculated efficiency of this antenna system is 54%. The efficiency includes spillover loss, amplitude taper, non-uniform phase, and reflection loss. This very low cost antenna can be easily extended to provide 170° coverage using a circular feed array around the spherical Teflon lens.

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