RCA was the Marconi Wireless Telegraph Company ofĪmerica ("American Marconi") until it was acquired by the General Electric Co. of America (RCA) as the patentĪssignee/owner. In December of 1925, Yagi patented the antenna system in Japan ( 69115), The latter article also proposes to use this type of antenna for directional radio beacons. In 1926, he co-published a first article outside Japan (USA, ref.ġ8D) with professor Hidetsugu Yagi, who only had a subordinate involvement in the actual R&D. During 1925-1929, he published his research in about a dozen articles in the Journal of the Institute of Electrical Engineers in Japan. In 1924/25, Shintaro Uda - engineer and assistant professor at Tohoku Imperial University in Japan - invented a highly directional multi-element antenna system.
YAGI-UDA LINEAR PHASED-ARRAY BEAM-ANTENNA This is illustrated below for various lengths of the passiveĮlement and various distances between the active and passive element: Interference) or partially cancel each other ( = destructive On the phase difference, the waves from the two sources reinforce each other ( = constructive These waves combine with the waves of the driven element. This induced current causes the passive element to Waves radiated by the driven element induces a current in the passive element. Passive "parasitic" element parallel to it at some distance. In its simplest form, this antenna consists of a driven element (typ. So I narrowed it down to a simple half-size 2-element Such aĭirectional antenna requires at least two elements, a full-size antenna for wavelength over 10 mtr will not fit, and 10 mtr is Installation at my QTH basically had to be on my terrace, so space is rather limited. In 2008, when I was between jobs for a while, I decided to build an HF antenna with more directivity than a simple dipole. (expanded Uda-Yagi section), 2 July 2020 (added ref. No part of this publication may be used without permission from the author. It is currently disabled in your browser! Please (re-)enable it for full functionality. My website uses JavaScript for menus etc.
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