Phillip Hagar Smith

From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other people named Philip Smith, see Philip Smith (disambiguation).

Phillip Hagar Smith (April 29, 1905–August 29, 1987) was an electrical engineer, who became famous for his invention of the Smith chart. Smith graduated from Tufts College in 1928 with a BS degree in electrical engineering. While working for Bell Telephone Laboratories,[1] he invented his eponymous Smith chart.[2]

When asked why he invented the chart, Smith explained, "From the time I could operate a slide rule, I've been interested in graphical representations of mathematical relationships." In 1969 he published the book Electronic Applications of the Smith Chart: In Waveguide, Circuit, and Component Analysis, a comprehensive work on the subject. He retired from Bell Labs in 1970. He was elected a fellow of the IRE in 1952.


  1. ^ Biography of Phillip Smith
  2. ^ "Phillip H. Smith: Originator of the Smith Chart". Microwave Journal 1 (1): 44–45. July/August 1958.  Check date values in: |date= (help)

External links[edit]