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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]
Panel antennas are common at Ultra high frequencies or UHF, where they are often used for cellular/mobile base stations or wireless networking due to their size and directional properties. At very high frequencies, such an antenna would be impractically large for most receiving applications unless implemented as no more than a two-bay design.
For this reason, Doppler DF systems normally mount their antennas on a small disk that is spun at a high speed using an electric motor. Performing the same calculation using an antenna mounted to a disk with a diameter of 50 centimetres (20 in) diameter spinning at 1000 Hz results in: S = .25 × 1000 × 101.8 / 48 = 530 Hz
A high-gain antenna (HGA) is a directional antenna with a focused, narrow beam width, permitting more precise targeting of the radio signals. [1] Most commonly referred to during space missions, [2] these antennas are also in use all over Earth, most successfully in flat, open areas where there are no mountains to disrupt radiowaves. [citation ...
Common 4-bay television antennas have gains around 10 to 12 dB, [5] and 8-bay designs might increase this to 12 to 16 dB. [6] The 32-element SCR-270 had a gain around 19.8 dB. [7] Some very large reflective arrays have been constructed, notably the Soviet Duga radars which are hundreds of meters across and contain hundreds of elements.
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Electromagnetic waves are radiated by electric charges when they are accelerated. [2] [10] In a transmitting antenna, radio waves are generated by time varying electric currents, consisting of electrons accelerating as they flow back and forth in the metal antenna, driven by the electric field due to the oscillating voltage applied to the antenna by the radio transmitter.
(Reuters) -Online travel agency Booking.com could cut jobs as part of a review of its organizational structure, it said on Saturday. The company, a unit of Booking Holdings, said in an emailed ...
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