Inducted 2006

In 1929, Lloyd Espenschied and Herman Affel invented coaxial cable at the AT&T Bell Telephone Laboratories. This
technological breakthrough allowed for long distance telephone service, making it possible to carry thousands of simultaneous
phone calls on long distance circuits.

Invention Impact

Coaxial cable is a copper cable lined with two concentric cylinders of conducting material. It is widely used by cable TV
and telephone companies for homes and businesses. Its effective transmission of high frequencies over long distances is the
industry standard used in business and corporation Ethernets.

Espenschied also contributed to the development of wire distribution of radio programming used in network radio. He patented
a collision avoidance system using reflected waves for railroad trains, and later applied similar techniques for a radio
altimeter for airplanes.

Inventors Bio

Born in St. Louis, Missouri, Espenschied studied at the Pratt Institute, graduating in 1909. He held over 130 patents, and
his extensive contributions to the field of telecommunications earned him the Institute of Radio Engineers’ Medal of Honor