Herman Andrew Affel
Born August 4 1893 – Died October 13 1972
Concentric Conduction System
Patent No. 1,835,031
Herman Affel and Lloyd Espenschied invented coaxial cable at AT&T Bell
Telephone Laboratories in 1929. The coaxial cable opened a wide spectrum of
frequencies for long distance telephone service, making it possible to carry
thousands of simultaneous phone calls on long distance circuits.
Broadband coaxial cable created a higher capacity for local and long
distance circuits. During his career at Bell Labs, Affel
worked with other engineers to combine coaxial cable with microwave relays,
making high-volume transcontinental telephone and
television transmission signals possible. He earned several other patents
for electronic devices, including advanced
transmitters and innovative antennas.
Affel was born in Brooklyn, New York and studied electrical engineering at
the Massachusetts Institute of Technology. As a
consultant to Bell Labs, Affel worked with Espenschied devising efficient
means to carry high frequencies needed for broadband communications systems.
Affel and Espenschied created a transmission system using a coaxial
conductor, consisting of two concentric cylinders of conducting material
separated by air. This structure reduced frequency losses and prevented