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The trideco antenna is a huge specialized umbrella antenna used in a few high power military transmitters at very low frequency (VLF). [5] [6] In a conventional umbrella antenna, the use of the sloping guy wires as the capacitive top load has some disadvantages: First, since the umbrella wires must be anchored to the ground, their length is ...
English: Diagram of an umbrella antenna, a toploaded wire transmitting antenna used in the medium frequency (MF), low frequency (LF) and very low frequency (VLF) bands. It consists of a steel mast (grey) insulated from the ground, with diagonal wires radiating from the top, anchored to the ground in a circle around it.
Diagram of Cutler antenna array. Isometric drawing of one of the two antenna arrays. The extensive antenna system consists of two separate identical specialized umbrella antenna arrays, designated the “north array” and the “south array”.
DHO38 uses an umbrella antenna which is carried from eight steel tube masts with a height of 352.8 metres. Each pylon stands on three-metre-tall ceramic cylinders, which serve as insulators for voltages up to 300 kV.
Umbrella_antenna_at_Nauen_wireless_station,_Germany_1915.png (771 × 213 pixels, file size: 23 KB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Hexbeam amateur radio antenna. A hexbeam, or hexagonal-beam, is a type of a directional antenna for shortwave, most often used in amateur radio. The name comes from the hexagonal outer shape of the antenna. It may also sometimes be known as a W-antenna, referring to the shape of the driver. The design looks something like an upturned umbrella.
The second antenna is a reference antenna, which points rigidly at the first antenna. Each antenna is alternately connected to a transmitter having a particular source impedance, and a receiver having the same input impedance (the impedance may differ between the two antennas).
A horn antenna has a flaring metal horn attached to a waveguide. It is a simple antenna with moderate gain of 15 to 25 dBi, used for applications such as radar guns, radiometers, and as feed antennas for parabolic dishes. Slot Consists of a waveguide with one or more slots cut in it to emit the microwaves. Linear slot antennas emit narrow fan ...