Pot antenna

from Wikipedia, the free encyclopedia

The pot antenna is a pot-shaped antenna design for the VHF and UHF range, which has a shortened overall length and an all-round ground potential .

It is used on electric railways as it prevents the high voltage of the overhead line from being carried into the vehicle in the event of contact. For DC voltage and for AC voltage of low frequencies, it forms a short circuit to the body panel. It is a type of antenna design known as a locomotive antenna, which, as a common feature, consists exclusively of components connected to ground potential.

At first glance, such pot antennas look like an upturned cooking pot , but the lower edge of the pot is separated from the vehicle by a gap. The inside of the pot is centrally connected to the roof of the vehicle via a conductive support. The feed is concealed to the inner edge of the pot via an adjustable coupling capacity ( trimmer ). Opposite is another trimmer for resonance adjustment. With this capacity, the pot forms a pot circle .

literature

  • Eberhard Spindler: The great antenna book . 11th edition, Franzis-Verlag GmbH, Munich, 1987, ISBN 3-7723-8761-6
  • Hans Lobensommer: Handbook of modern radio technology. 1st edition, Franzis Verlag GmbH, Poing 1995, ISBN 3-7723-4262-0

source