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In North America, for instance, there are transmitting antennas on the Empire State Building, the Willis Tower, Prudential Tower, 4 Times Square, and One World Trade Center. The North Tower of the original World Trade Center also had a 110-metre (360 ft) telecommunications antenna atop its roof, constructed in 1978–1979, and began ...
Antenna Products Corporation is an international communication equipment manufacturer and distributor worldwide. Its products include antennas, tower, masts and relevant communication equipment. [1] Its subsidiary, Antenna Products Corp, is a global manufacture with ISO 9001:2008 certification. [2]
The category of simple antennas consists of dipoles, monopoles, and loop antennas. Nearly all can be made with a single segment of wire (ignoring the break made in the wire for the feedline connection). [citation needed] Dipoles and monopoles called linear antennas (or straight wire antennas) since their radiating parts lie along a single ...
Most materials used in antennas meet these conditions, but some microwave antennas use high-tech components such as isolators and circulators, made of nonreciprocal materials such as ferrite. [ 12 ] [ 13 ] These can be used to give the antenna a different behavior on receiving than it has on transmitting, [ 12 ] which can be useful in ...
The operation is spread among seven buildings that encompass about 250,000 square feet, including the headquarters, antenna and tower fabrication plants, and specialty buildings that contain ...
Counterpoises are typically used in antenna systems for radio transmitters where a good earth ground connection cannot be constructed.. Monopole antennas used at low frequencies, below 3 MHz, such as the mast radiator antennas used for AM broadcasting, require the radio transmitter to be electrically connected to the Earth under the antenna; this is called a ground (or earth).
The building may also contain lightning protection devices and power transformers for aircraft warning lights on the tower. The radio transmitter which generates the radio frequency current which powers the antenna is generally located away from the antenna, to prevent the powerful radio waves from interfering with the sensitive transmitter ...
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