Title :
Spherical-Lens Antennas For Millimeter Wave Radars
Author :
Schoenlinner, Bernhard ; Wu, Xidong ; Eleftheriades, George V. ; Rebeiz, Gabriel M.
Author_Institution :
Radiation Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan, 49109-2122, USA. bernhrd@engin.umich.edu
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 ¿m-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.
Keywords :
Antenna measurements; Costs; Diffraction; Lenses; Millimeter wave measurements; Millimeter wave radar; Mobile antennas; Optical reflection; Radar antennas; Slot antennas;
Conference_Titel :
Microwave Conference, 2001. 31st European
Conference_Location :
London, England
DOI :
10.1109/EUMA.2001.339108
