Abstract
Sixty years ago this month, the PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS (IRE) included a paper on the design of directional antennas by W. W. Hansen (Fig. 1) and J. R. Woodyard. At the time, Hansen was teaching physics at Stanford University, Stanford, CA, and Woodyard was a graduate student at Stanford. During the same year, 1938, Hansen published a seminal paper on the rhumbatron, a high-frequency cavity resonator that he had invented. He still is remembered fondly by alumni of the World War II Radiation Laboratory for the lectures he gave on microwave theory and practice and for the “Hansen notes” based on his lectures. He was instrumental in the development of the klystron and the linear accelerator during a brief but brilliant career.
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