What are the different types of UHF Yagi antennas?

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Yagi antenna, created by Shintaro Uda and Hidetsug Yagi in 1926, are directional, highly profitable dipoles with added reflector and at least one director. There are countless variations on the original Yagi antenna. The UHF Yagi antenna is designed specifically for the ultra -high frequency belt, from 300 Megahertz (MHz) to 2 Gigahertz (GHz). Among the different types of UHF Yagi antennas include those used to receive television, amateur radio, radio Citizen Band (CB) and satellite signals. Later designs have expanded the use of Yagi to high -frequency zones, including 28, 21 and 14 MHz. Multiband Yagis uses pairs of coils and capacitors called traps that insulate radio signals from multiple belts. In exchange for increased functionality, however, some efficiency will be lost. The use of traps also reduces the bandwidth of the antenna band.

Yagi has also been modified for use in receiving TV signals in the UHF band, Because its directionality and profit. The popularity of the satellite and cable transmission has reduced the need for UHF Yagi antenna for television signals but yagIt is still commonly used for amateur radio, CB radio and satellite communication. The UHF Yagi antenna remained one of the most efficient proposals for the transmission and receiving UHF.

There are almost as many versions of the UHF Yagi antenna, such as users. In addition to commercially made yagis, individual users of amateur radios are constantly designing and creating their own versions. What defines an antenna like Yagi is the use of a half -wave length dipole as a controlled element, a reflector that is greater than half of the wavelength and one or more directors that are less than half of the wavelength. This combination creates a phase field that increases profit. The size and gap of each of these elements is controlled by a grave in which the antenna will be resonant.

The National US Standard Office, now known as the National Institute for Standards and Technology, examined six basic Yagi and antenna proposals and measured their performance in the studyé in 1976.