单词	beam width
释义	beam width beam width The angle between the directions, on either side of the axis, at which the intensity of the radio frequency field drops to one-half the value it has on the axis. beam width beam width [′bēm ‚width] (electromagnetism) The angle, measured in a horizontal plane, between the directions at which the intensity of an electromagnetic beam, such as a radar or radio beam, is one-half its maximum value. Also known as beam angle. beam width The beam width of an antenna is the angle in degrees between the half-power points in the azimuth plane.The full angular interval in the horizontal plane between the points at which the power radiated from the antenna has fallen to half its maximum value. In practice, the effective beam width may be less than this value and may be altered by use of gain control. The beam width of radar is a measure of its discrimination (i.e., it determines the minimum angular separation that two targets can have and still be resolved). Two targets at the same range whose angular separations at the radar antenna exceed one-half of the beam width between half-power points, generally, will be resolved or distinguishable as two individual targets. The smaller the beam width, the greater the annular resolving power. Beam width may be at different locations through the axis, depending upon the shape of the antenna reflector.
随便看	geoff howe business machines geoffrey geoffrey boycott geoffrey chaucer geoffrey de bouillon geoffrey de monmouth geoffrey ingram taylor geoffrey iv geoffrey iv of anjou geoffrey monmouth geoffrey of monmouth geoffrey of villehardouin geoffrey of viterbo geoffrey plantagenet geoffrey werner-allen geoffrey wilkinson geoffrey young gallery geoffroea geoffroea decorticans geoffroy geoffroy de villehardouin geoffroyism geoffroy saint-hilaire, eitienne geoffroy saint-hilaire, etienne geoffroy saint-hilaire, isidore

英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。