An Automatic Contour Plotter for the Investigation of Radiation Patterns of Directive Antennae

An instrument is described which permits the rapid and accurate plotting of the complete radiation characteristics of directive antennae. The information is presented in the form of a contour map. This gives far more information than can be obtained from a simple polar diagram. The instrument itself is described in Section 2, and an example of the type of record produced is given. Section 3 describes the use of the device in solving a particular production problem and Section 4 gives a method of ¿balance line¿ plotting which was developed.