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单词 Umbrella antenna
释义

Umbrella antenna

英语百科

Umbrella antenna

Umbrella antenna for early VLF spark transmitter at Nauen, Germany, 1907
220 ft umbrella antenna of 200 kHz wireless telegraphy station near Newcastle, England, 1910

An umbrella antenna is a top-loaded electrically lengthened monopole antenna, consisting in most cases of a mast fed at the ground end, to which a number of radial wires are connected at the top, sloping downwards. The outer end of each wire is connected by an insulator to a supporting rope or cable anchored to the ground. The radial wires can also function as guy wires to support the mast. The radial wires make the antenna look like a giant umbrella without the cloth, accounting for the name.

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