beam width


Also found in: Dictionary.
Related to beam width: directivity, Band 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

beam widthclick for a larger image
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.
References in periodicals archive ?
The 18 dBi antenna was also always questioned both for its narrow vertical beam width and also its horizontal beam width of "only" 65[degrees].
Equability stability of ultrasonic beam width in the sufficiently large axis directivity distance can be reached with a number [D.
MMW technology's narrow beam width helps eliminate the chance of signal capture and its proprietary technology makes tapping into and decoding data being transferred difficult, even if the signal is intercepted.
44 is a property of the laser beam geometry corresponding to the beam width.
The antennas boast superior radiation patterns due to their unique reflector design, providing a very small variation of the -3 dB horizontal beam width over the frequency band, as well as a high front-to-back ratio.
The beam width of the signal also created problems reading the bottom of the silo, which is typically conical and narrower than the main body of the structure.
The laser beam width dictates the system's level of part quality; the laser can be focused within a tolerance range of 0.
Conventional laser welding technology uses fibre optics, with the result that the beam width is restricted to about 1mm, making welding of large or complex workpieces a difficult process.
The effect of receiver beam width on the detection time of a message from Talking Signs, an auditory orientation aid for the blind.
The PS employs a phase shift EDM that has a smaller beam width than other reflectorless instruments in its class.
The D5503i antenna supports MIMO across the full frequency range from 698 -2700 MHz, with a 60 degree/60 degree beam width and 8 dBi gain at 698-960 MHz and a 30 degree/60 degree beam width and 11.
This omni-directional millimeter wave antenna has a 30 degree vertical beam width and a 360 degree horizontal gain variation, making it ideal for short range wireless communications, indoor networks, high frequency applications and 60 GHz development systems.