A Yagi antenna (often called a Yagi-Uda antenna) is a type of directional radio antenna widely used for wireless communication links, cellular bands, IoT systems, and point-to-point signal transmission. It’s especially effective in the 824–896 MHz range, which covers many cellular and wireless communication bands (including 850 MHz mobile/4G services).
The antenna gets its name from its Japanese inventors (H. Yagi and S. Uda) and is constructed from a series of metal elements mounted on a central boom:
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Driven element – the main active part connected to the radio or transmitter/receiver.
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Directors – shorter elements in front of the driven element that help focus energy.
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Reflector – a slightly longer element behind the driven element that reflects energy forward.
This arrangement gives it directional performance — meaning it focuses radio energy in one direction, increasing range and reducing interference from other directions.
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