Discovery of the Principle of Self-Complementarity in Antennas
and the Mushiake Relationship, 1948

In 1948, Prof. Yasuto Mushiake of Tohoku University discovered that antennas with self-complementary geometries are frequency independent, presenting a constant impedance, and often a constant radiation pattern over very wide frequency ranges. This principle is the basis for many very-wide-bandwidth antenna designs, with
applications that include television reception, wireless broadband,
radio astronomy, and cellular telephony.

July 2017

This 2017 IEEE Milestone is dedicated to Tohoku University on the basis of the research achievements in 1948 conducted by presently 96 years-old one person, instead of that of deceased persons, large organizations or companies, as usual. This fact is really worthy of attention.

Therefore, the recognition by the IEEE this time is quite a rare and new case, and this is certainly a surprising congratulatory event.

Measured radiation patterns Top Page Mushiake relationship