A sensor for obtaining vehicular traffic data is described. The sensor
includes a housing having a front surface. The sensor also includes an
antenna plate having an antenna ground surface and a radiating surface.
The antenna plate is disposed within the housing for transmitting
radiation to a vehicle through the front surface and for receiving the
radiation reflected back from the vehicle through the front surface. A
transceiver circuit plate is disposed within the housing for electrically
driving the antenna plate. The transceiver circuit plate has a component
side for supporting circuit components and a circuit ground side for
grounding the circuit components. The antenna ground surface is between
the radiating surface and the transceiver circuit plate. A processor unit
drives and processes electrical signals from the transceiver circuit
plate to obtain vehicular traffic data.