At the beam edge, -3 dB point, radar detection range decreases 29%. A radar has maximum detection performance in the beam center. Most police down the road radars have beams between 9° and 15° that easily covers several lanes of traffic at relatively short ranges.Īntenna beamwidth is defined as the angle between the half power, -3 dB, points. The figure below graphs beamwidth spread in feet versus range for a beamwidth of 1, 5, 10, 15, 20, 25, and 30 degrees. Rectangular and elliptical antennas have a more narrow beamwidth in the plane the antenna is wider, and a wider beamwidth where the antenna is more narrow.ĭ = beam spread distance, R = range, ß w = beamwidthīeamwidth Spread Distance Calculate Beam Spread Circular antennas have a symmetrical beam, the same beamwidth in the vertical and horizontal planes. When several vehicles are in the beam the operator must interpret, sometime guess, which vehicle the radar is tracking.īeamwidth varies with model from about 9° to 25°, the larger the antenna and the higher the frequency the more narrow the beam. Acceleration Parameters Constants / Conversions Police 10 Codes Universal Time (UTC) Links Blog Previous |Īntenna beamwidth limits radar ability to distinguish multiple vehicles.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
March 2023
Categories |