Low Cost K-Band Doppler Radar Sensor

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  • Author: By Kecheng Xiao, Richard Crabtree, Jay Mccandless
A low-cost short-range K-band Doppler radar sensor for traffic control applications has been developed. The compact sensor, including a waveguide front-end module and a planar patch antenna, weighs only 0.1 lb. The module incorporates a Gunn oscillator, a mixer and a simple coupling/duplex configuration; the antenna is realized on a 0.031” thick Rogers 4003 laminate to allow its stand alone operation. The antenna is fed by the module through a unique dual waveguide-to-microstrip transition which is also integrated in the patch antenna design. It is anticipated that this simple low-cost sensor has a more than 100 meters detection range.