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Fixed wireless services typically use a directional radio antenna on each end of the signal (e.g., on each building). These antennas are generally larger than those seen in Wi-Fi setups and are designed for outdoor use. Several types of radio antennas are available that accommodate various weather conditions, signal distances and bandwidths.
The origin of the word antenna relative to wireless apparatus is attributed to Italian radio pioneer Guglielmo Marconi. In the summer of 1895, Marconi began testing his wireless system outdoors on his father's estate near Bologna and soon began to experiment with long wire "aerials" suspended from a pole. [5]
The antenna array is composed of three concentric rings of antenna elements. Each ring of elements receives RF signals for an assigned portion of the 1.5 to 30-MHz radio spectrum. The outer ring normally covers the 2 to 6-MHz range (band A), but also provides reduced coverage down to 1.5 MHz.
Licensed point-to-point microwave was first deployed by AT&T Long Lines in the 1960s for high-bandwidth, interstate transmission of voice, data and television. AT&T's network covered the entire U.S., carried across hundreds of microwave towers, largely transmitting at 3700–4200 MHz and 5000–6200 MHz.
Moxon antenna for the 20-meter band.The antenna is the faint rectangle of wires held in tension by the bent X-shaped support frame. Moxon antenna for the 2-meter band. The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. [1]
The system was four times more accurate than the prior Navy AN/GRD-6 system with bearing accuracy better than 0.5 degrees. [2] The Navy AN/FRD-10 was slightly smaller and had a narrower frequency range compared to the Air Force AN/FLR-9 system. [2] The FRD-10 had only 2 antenna rings, 870 feet (270 m) and 780 feet (240 m) diameters. [2]
A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner. [2] In order to provide a dynamic response, reconfigurable antennas integrate an inner mechanism (such as RF switches, varactors, mechanical actuators or tunable materials) that enable the intentional redistribution of the RF currents over the ...
Local multipoint distribution service (LMDS) is a broadband wireless access technology originally designed for digital television transmission (DTV). It was conceived as a fixed wireless, point-to-multipoint technology for utilization in the last mile. [1] LMDS commonly operates on microwave frequencies across the 26 GHz and 29 GHz bands. In ...
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