Bernard Tellegen

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Bernardus Dominicus Hubertus Tellegen (born June 24, 1900 in Winschoten , † August 30, 1990 in Eindhoven ) was a Dutch electrical engineer .


Tellegen studied electrical engineering at the Technical University of Delft until 1923 . In 1924 he became an employee of the Philips Natuurkundig Laboratorium .

Tellegen's first studies concerned vacuum tubes , his interest was the movement of electrons in triodes and multi-grid tubes. This led him to the invention of the pentode in 1926 , which he patented in several countries. Furthermore, he received around 57 patents in his life (alone or in cooperation with others).

In the years that followed he wrote several publications on electrical circuits.

In 1932 it was found that the radio programs from Radio Beromünster , when they arrived in the Netherlands, also contained signals from Radio Luxemburg . Initially, crosstalk was suspected in the receiver tubes. However, Tellegen managed to prove that this was a non-linear effect in the ionosphere - triggered by the very strong Luxembourg transmitter ( Luxembourg effect ).

In his further work on electrical networks, he was interested in fundamental problems such as duality, geometrical configurations and synthesis, in particular of resistance-free quadrupoles. In his fundamental study of classical passive elements, he concluded that a new element, the gyrator , would complete the existing set. Tellegen also examined the properties of circuits using this component.

In 1952, Tellegen published Tellegen's theorem .

From 1946 to 1966 he was Associate Professor of Circuit Theory at Delft University of Technology.

From 1942 to 1952 he was President of the Nederlands Elektronica en Radio Genootschap (Dutch Electronics and Radio Society), which then made him an honorary member. From 1948 to 1960 he was chairman of the Dutch committee of the International Union of Radio Science (URSI), of which he was vice-president from 1952 to 1957. From 1957 to 1960 he was deputy chairman of their commission.


  • Honorary member of the Nederlands Elektronica en Radio Genootschap
  • Honorary Member of the Australian Institute of Radio Engineers for Life (1953)
  • Science Award of the Royal Dutch Institute of Engineers (KIVI)
  • IEEE Fellow Award (1955)
  • IEEE Edison Medal (1973)
  • Dr. hc from Delft University (1970)

Individual evidence

  1. Interaction between radio waves?