Short turn against the antenna

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Comparison between the two types of antennas.
A short backfire antenna (or cutting back the fire, the SBA, or SBFA SBF) is a directional antenna, which is characterized by high gain, the relatively small size and narrow band. It's shaped like a disc with a straight line a vertical column with a dipole which acts as a driving force at about the environment and a driver disk to the summit as a sub-reflector. The bottom plate is the diameter of two wavelengths, and a necklace (EDGE) is the great quarter-wave. The central pillar is formed by two coaxial tubes (diameter must be carefully chosen to give desired impedance) with a quarter-wave slot cut into the outer tube
This structure behaves as a resonant cavity, resulting in a significant increase in space restricted.
Short turn against the antennas are used in some satellites and high frequency (short wavelength) communication equipment (often for communication with satellites) in ships and other applications where rugged construction is an advantage. Wireless LANs are also used. SBF antenna was invented by Dr. Hermann W. Ehrenspeck Air Force Research Labs, based in Cambridge Hansom Air Force Base in Bedford, MA and has been used for other purposes, to provide communications satellite tactics for U.S. forces from the army for portability SBF and profit.
The bandwidth of the antenna can be increased using a conical reflector rather than a main course.
Objective archery antenna is a short backfire antenna developments. The name derives from its appearance. The diameter of the base is 5 wavelengths (5), the height of the rim is 0.7, the small diameter of the center of the reflector is 0.7, based on its height is 0.7 and the height of the dipole Base is above 0.35, there is still a reflector – a reflector ring – the same height as the center of the reflector, with an inner diameter of 2.2 to 3.7 outside diameter.
See also
FRAR: 2.4 GHz, antenna counter
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