Friday, March 17, 2017
Ascension Lutheran Church 1220 West Magee Road, Tucson, AZ
Presented by Tom, W8TK
"Build your own test equipment"
Presented by Gary Thiele, KD8ZWS
The Yagi-Uda antenna was invented in Japan in 1926 and saw use in early WWII as a VHF radar antenna. In 1943 the (classified) invention of the Magnetron enabled the Allies to develop airborne radar at centimeter wavelengths (for which other antennas were more suitable). The technological advance of allied airborne radar contributed significantly to the demise of the German U-boats. After the war, the Yagi-Uda became a favorite Ham antenna.
The talk, in four parts, will: 1) trace the historical development and use of the Yagi-Uda; 2) reflect on some personal experiences; 3) review some antenna basics; 4) conclude with a brief technical discussion that will show why the director and reflector elements are configured as they usually are, and why the antenna has narrow bandwidth, among other characteristics.
Gary Thiele is co-author of the book “Antenna Theory & Design,” Wiley 1981, 1998, and 2013 (822 pages). The text serves both the academic market and industrial users.