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Single-armed antennas, like a single "telescoping" antenna. At the lowest resonant frequency that arm is slightly under a quarter-wave long. Both dipoles and monopoles are often built large enough to be self-resonant; usually each arm is a quarter-wave long.
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 disturbed. Whip antennas for portable radios are often made of a series of interlocking telescoping metal tubes, so they can be retracted when not in use.
A loop antenna for UHF reception. This model also has two telescopic poles for VHF. It also has a mains-powered amplifier to improve signal strength. Indoor antennas may be mounted on the television itself or stand on a table next to it, connected to the television by a short feed line.
Telescoping in mechanics describes the movement of one part sliding out from another, lengthening an object (such as a telescope or the lift arm of an aerial work platform) from its rest state. [1] In modern equipment this can be achieved by a hydraulics , but pulleys are generally used for simpler designs such as extendable ladders and amateur ...
A mast radiator or mast antenna is a radio tower or mast in which the whole structure is an antenna. Mast antennas are the transmitting antennas typical for long or medium wave broadcasting. Structurally, the only difference is that some mast radiators require the mast base to be insulated from the ground.
A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, ... even when a telescoping antenna may be attached for FM reception. [12] ...
The antenna gain, or power gain of an antenna is defined as the ratio of the intensity (power per unit surface area) radiated by the antenna in the direction of its maximum output, at an arbitrary distance, divided by the intensity radiated at the same distance by a hypothetical isotropic antenna which radiates equal power in all directions.
The rubber ducky antenna (or rubber duck aerial) is an electrically short monopole antenna, invented by Richard B. Johnson, that functions somewhat like a base-loaded whip antenna. It consists of a springy wire in the shape of a narrow helix , sealed in a rubber or plastic jacket to protect the antenna. [ 1 ]
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