What is Yagi antenna?

Yagi antenna, also known as Yagi-Oudo or Yagi antenna, is a type of antenna field often used by amateur radio operators. It can also be used for other purposes, for example as a television antenna, to collect radio signals from space and as a cell antenna. Depending on its construction, it can be used to communicate on frequencies from short wool to microwave, covering the spectrum from very high frequency (VHF) through ultra -high frequencies (UHF). The Yagi antenna is a directional antenna, which means that its transmission and receiving force are focused in one direction and that one needs to be directed in a specific direction that one wants to receive or transmit. It is also a high profit, which means that it allows increased signal strength both when receiving, capturing more radio signal and transmission by allowing more transmitted energy.

The antenna was invented in 1926 by two Japanese scientists. In its most basic one consists of a row of three -long parallel pieces of metal connected to CEntral boom. Three metal pieces are elements of the antenna: reflector, controlled element and director.

The reflector that absorbs and re -reflects the radio waves is located at the rear of the field. The director's element is on the front and allows transmission and reception. The driven element, also called an active element, is the only part connected to the cable or the source source that drives the antenna. Other elements are called parasitic or passive.

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Yagi antenna usually consists of one reflector, one controlled element and one or more directors. Depending on the length and gap of these parts, the performance of the antenna changes and receives and transmits at various frequencies. Mathematical formulas are used to calculate how long different elements should be and how they should be distributed for different frequencyies. For use on UHF frequencies, the antenna is usually 1 foot (30 cm), several feet long and has 10-20 directors. Yagi antenna usedThe frequencies of VHF usually have fewer antenna elements, located located.

Yagi antenna is sometimes combined with a rotator, so it can be easily rotated in different directions. It is necessary to install it as highest, preferably in place without trees or structures that prevent its transmission and intake. The Yagi antenna is relatively easily assembled and installed and can be constructed from welding pipe, aluminum tubing or copper house.