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An X-band FMCW sensor is developed with beam-scanning capability to reliably detect the vehicles with different shapes. Two-element transmitting antenna array is designed with single phase shifter and an unequal power divider to reduce the cost and achieve compact size of 4.5 cm × 4 cm. Experiments successfully confirm precise identification of the incoming vehicle and its occupancy.
In this paper, we propose and design a coaxial-line fed slot array with a waveguide-to-coaxial transition using a crank-shaped slot. We analyze the 8×8-element trapezoidal array with the designed transition. The bandwidth for VSWR less than 1.5 is 2.1% in the waveguide for boresight radiation and 2.0% in the waveguide for tilted radiation from 77 to 81 GHz.
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