The Yagi its everywhere

The Yagi antenna in all its forms are the basic of radio, and television reception via this marvellous creation. We celebrate the 130th birthday of Hidetsugu Yagi, of Tohoku Imperial University, Japan, along with a lesser role played by his colleague Shintaro Uda, spread the technology, also called the Yagi-Uda antenna.

The invention was patented in 1926, and later transferred to the Marconi company. Apart from directional gain, it can be orientated to favour horizontal or vertical polarisation, and has a high front-to-back ratio.

These attributes help avoid interference and enable distant adjacent users to share the same frequency, but have opposite polarity. Yagi antennas were first widely used during World War II, and later had extensive use in home TV reception. Also called a ‘beam antenna’, the Yagi is very widely used as a high-gain antenna on the HF, VHF and UHF bands.

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