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antenna scanning

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  • Antenna measurement — techniques refers to the testing of antennas to ensure that the antenna meets specifications or simply to characterize it. Typical parameters of antennas are gain, radiation pattern, beamwidth, polarization, and impedance.The antenna pattern is… …   Wikipedia

  • scanning radar — scanning radar, a radar with a large, stationary antenna which points the radar beam in different vertical directions by shifting the frequency of the radar waves …   Useful english dictionary

  • scanning — In radar, the motion of the radar antenna assembly when searching for targets. Scanning usually follows a systematic pattern involving one or more of the following: i. In horizontal scanning (or search lighting), the antenna is continuously… …   Aviation dictionary

  • Antenna-Diversity — Der englische Begriff Antenna Diversity (deutsch Antennendiversität) bezeichnet ein Verfahren, bei dem mehrere Antennen pro Sender oder Empfänger verwendet werden, um Interferenz Effekte bei der Funkübertragung zu reduzieren. Dies ist besonders… …   Deutsch Wikipedia

  • Antenna Diversity — Der englische Begriff Antenna Diversity (deutsch Antennendiversität) bezeichnet ein Verfahren, bei dem mehrere Antennen pro Sender oder Empfänger verwendet werden, um Interferenz Effekte bei der Funkübertragung zu reduzieren. Dies ist besonders… …   Deutsch Wikipedia

  • Conical scanning — is a system used in early radar units to improve their accuracy, as well as making it easier to steer the antenna properly to point at a target. Conical scanning is similar in concept to the earlier lobe switching concept used on some of the… …   Wikipedia

  • Metamaterial antenna — This Z antenna tested at the National Institute of Standards and Technology is smaller than a standard antenna with comparable properties. Its high efficiency is derived from the Z element inside the square that acts as a metamaterial, greatly… …   Wikipedia

  • conical scanning — A radar scan pattern in which a point on the radar beam describes a circle at the base of a cone. This type of scan pattern provides both elevation and azimuth data. The radiation pattern of the antenna is made slightly lopsided, and the antenna… …   Aviation dictionary

  • Yagi antenna — A Yagi Uda Antenna, commonly known simply as a Yagi antenna or Yagi, is a directional antenna system [ [http://what is what.com/what is/Yagi Uda antenna.html What is a Yagi Uda antenna? An explanation of the familiar Yagi Uda antenna from a non… …   Wikipedia

  • electrical scanning — 1. Electronics. a technique for varying the sector covered by a transmitting or receiving antenna by electrical means without moving the antenna. 2. Also called electronic scanning. Television. the technique used in scanning a surface to… …   Universalium

  • electrical scanning — 1. Electronics. a technique for varying the sector covered by a transmitting or receiving antenna by electrical means without moving the antenna. 2. Also called electronic scanning. Television. the technique used in scanning a surface to… …   Useful english dictionary

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