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Thus, mounting the loop in a horizontal plane will produce an omnidirectional antenna which is horizontally polarized; mounting the loop vertically yields a vertically polarized, weakly directional antenna, but with exceptionally sharp nulls along the axis of the loop. [j] Size criteria that favor loops with a perimeter of 1 / 4 wave or ...
The nominal "80 meter" band begins at 3.5 MHz (85.7 m wavelength) and goes up to 4.0 MHz (74.9 m wavelength).The upper part of the band, mostly used for voice, is often referred to as 75 meters, since in Region 2, the wavelengths in that section are between 80–75 meters (adjacent to or overlapping a shortwave broadcast band called by the same name: "75 m").
Fractal filters (a type of tuned circuit) are another example where the superiority of the fractal approach for smaller size and better rejection has been proven. [ 24 ] [ 25 ] [ 26 ] As fractals can be used as counterpoises, loads, ground planes, and filters, all parts that can be integrated with antennas, they are considered parts of some ...
Celebrity hairstylist Graham Nation has died. He was 39. According to the L.A. County Department of Medical Examiner, he died at a gym in Los Angeles on Friday, Feb. 14.
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In 1938, George Brown et al. patented a loop antenna with rhombic shape and quarterwave sides. [2] In 1951 Clarence C. Moore, W9LZX, a Christian missionary and engineer at HCJB (a shortwave missionary radio station high in the Andean Mountains) developed and patented [3] a two-turn loop antenna which he called a "quad".
British musician Sir Paul McCartney performs as part of his 'Got Back' tour, at the Allianz Parque stadium in Sao Paulo, Brazil, on Oct. 15, 2024.
A small loop antenna, on the other hand, has lower radiation resistance [b] and is not self-resonant; it requires some form of impedance matching to counter the loop's reactance – in practice, this usually consists of a variable capacitor bridging the point corresponding to the gap of a halo. Connection diagram for a gamma matched halo antenna.