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A coaxial antenna (often known as a coaxial dipole) is a particular form of a half-wave dipole antenna, most often employed as a vertically polarized omnidirectional antenna. History [ edit ]
Folded dipole Double-wire dipole whose characteristic impedance in free space is around 300 Ω. Dipole Although the center impedance at resonance is approximately 73 Ω in free space, in actual use it varies between 30 and 100 Ω, depending on height above ground, so with high-impedance feedline a T-match or Y-match feed will probably be necessary.
German physicist Heinrich Hertz first demonstrated the existence of radio waves in 1887 using what we now know as a dipole antenna (with capacitative end-loading). On the other hand, Guglielmo Marconi empirically found that he could just ground the transmitter (or one side of a transmission line, if used) dispensing with one half of the antenna, thus realizing the vertical or monopole antenna.
A dipole with cone-shaped arms, with the feedpoint where their tips meet; they are sometimes called "fat dipoles" or "double bowling pins". They show broader bandwidth than ordinary dipoles, up to three octaves above their base frequency. The monopole version is called a discone antenna. [l] Bow-tie antenna
Aug. 25—Whether the $700 million sale of Bazooka Candy Brands to a private equity firm will impact workers at a Scranton production plant is unclear. News outlets including The Wall Street ...
S&P 500 Shiller CAPE Ratio data by YCharts.. As of the closing bell on July 26, the S&P 500's Shiller price-to-earnings (P/E) ratio -- also known as the cyclically adjusted price-to-earnings ratio ...
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.
Patterned Vivaldi antenna, made from double-sided printed circuit board material. The feedline excites an open space via a microstrip line or coaxial cable, and may be terminated with either a sector-shaped area or a direct coaxial connection. From the open space, the signal traverses an exponentially tapered pattern via a symmetrical slot line.