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So antennas with large effective apertures are considered high-gain antennas (or beam antennas), which have relatively small angular beam widths. As receiving antennas, they are much more sensitive to radio waves coming from a preferred direction compared to waves coming from other directions (which would be considered interference).
The initial cost was to be around 10 billion SEK but the price is deemed much higher the granted funds for the sale is $3.2 billion, [220] known as Luftvärnssystem 103 (Anti-air system 103) in Swedish service, would be delivered in 2021 and 2022.
The first experiments using lenses to refract and focus radio waves occurred during the earliest research on radio waves in the 1890s. In 1873 mathematical physicist James Clerk Maxwell in his electromagnetic theory, now called Maxwell's equations, predicted the existence of electromagnetic waves and proposed that light consisted of electromagnetic waves of very short wavelength.
Most active antennas consist of a short conventional antenna, such as a small whip antenna, connected to an active component (usually a FET). The active circuit compensates for the signal attenuation caused by the mismatch between antenna size and signal wavelength. The active circuit consists of an impedance translating stage and an optional ...
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]
Drawing of a Yagi–Uda VHF television antenna used for analog channels 2–4, 54–72 MHz (U.S. channels). It has four parasitic elements: three directors (to left) and one reflector (to right) and one driven element which is a folded dipole (double rod) connected to a 300 Ω twin lead feedline down the mast to the television set.
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