International Symposium on Antennas and Propagation
Antenna Array for a 24-GHz Automotive Radar with Dipole Antenna Element Patches
Johan Wernehag, Henrik Sjoland,
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In this paper 3D electromagnetic simulations of an antenna array have been performed. The array is intended for automotive radar applications at 24 GHz. It is constructed from dipole antenna element patches, which are fed in the center by a differential signal. The dipole antenna element patches are simulated assuming a standard off the shelf substrate. They have a standing wave ratio less than 3 from 22.5 GHz to 24.5 GHz, when matched to 60 Ω. The directivity of the dipole patch is 9 dBi. The array consists of 24 elements giving it a physical size of 150 mm, with a groundplane of 200×100 mm2. An antenna of that size is easy to integrate in a car. Beam steering can be accomplished by changing the phases of the signals to the different elements , thus making the arrangement mechanically robust since the antenna does not have to move. The directivity for the antenna array is larger than 9.4 dBi for a steering angle of ±7? and the half power beam width is smaller than 6? over the same steering angle.