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The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.
English: Diagram of a J-pole antenna, a vertical end-fed half-wave omnidirectional transmitting antenna used in the shortwave frequency bands. It consists of a vertical element a half wavelength (/) long, fed in series with a quarter wavelength (/) transmission line stub, with the coaxial cable feedline (F) from the transmitter attached along the stub.
The diagram shows the standing waves of voltage (V, red bands) and current (I, blue bands) on the antenna elements. It consists of a vertical element a half wavelength ( λ / 2 {\displaystyle \lambda /2} ) long, fed in series with a quarter wavelength ( λ / 4 {\displaystyle \lambda /4} ) transmission line stub , with the parallel wire feedline ...
A whip antenna is an antenna consisting of a straight flexible wire or rod. The bottom end of the whip is connected to the radio receiver or transmitter. A whip antenna is a form of monopole antenna. The antenna is designed to be flexible so that it does not break easily, and the name is derived from the whip-like motion that it exhibits when ...
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The diagram here is nice; I could add pictures, but the j-pole is large and difficult to photograph clearly. --ssd 22:17, 21 July 2007 (UTC) The J Pole or Zepp Antenna is a voltage fed antenna that was invented by the Germans (citation needed). It was first used on the Zepplin Ballon Air Ships (citation needed) hence the name Zepp Antenna.
Typical GSM sector antenna outdoor unit. A sector antenna is a type of directional microwave antenna with a sector-shaped radiation pattern.The word "sector" is used in the geometric sense; some portion of the circumference of a circle measured in degrees of arc. 60°, 90° and 120° designs are typical, often with a few degrees 'extra' to ensure overlap and mounted in multiples when wider or ...
Time in Sri Lanka since 15 April 2006 is officially represented by the ... The IANA time zone database contains one zone for Sri Lanka in the file zone.tab, named ...
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