Polyrod antennas

The polyrod, a new form of microwave endfire antenna, is described. This consists of a properly shaped dielectric rod protruding from a metal waveguide. For applications requiring moderate gain, it possesses desirable electrical and mechanical properties. It is useful as a unit antenna in broadside arrays on account of its low crosstalk into adjacent polyrods. This paper describes work done from 1941 to 1944 at the Bell Telephone Laboratories, Holmdel, N. J. Important individual contributions are acknowledged in some of the footnotes. A report of this development has been withheld from earlier publication for reasons of military security.