Tech Briefs

Displaying and Analyzing Antenna Radiation Patterns

Radiant Energy Display and Analysis Software Package (REDAP) is a computer program for processing antenna-radiation- pattern data that have been preprocessed by a data-collection program and stored in a spherical-coordinate format. REDAP is designed specifically for application to data generated in testing of antennas in an anechoic chamber at Johnson Space Center; parts of REDAP may be reusable for processing antennatest data collected elsewhere. REDAP provides a graphical user interface (GUI) and executes mathematical and plotting routines on a personal computer. The routines include statistical calculations (e.g., maximum, minimum, 3-dB-falloff points, and percent coverage); addition and subtraction of offsets; multiplication and division by scaling factors; and computation of circular-polarization characteristics from linear-polarization measurement data.

A Sample Polar Plot illustrates one of the formats that can be generated from REDAP.
REDAP can display radiation-pattern data in a variety of formats that include, for example, lines plotted on rectangular coordinates, images of radiation patterns in three-dimensional space, and contour plots on polar coordinates (see figure). All characteristics of a display, including contents of plots, coordinate axes, marks, colors, and the destination (e.g., printer or file) to which the display data are to be sent are controlled through a series of GUI dialog boxes.

This work was done by Jim Siekierski of Johnson Space Center and Ash Henson of Lockheed Martin Corp.

This Brief includes a Technical Support Package (TSP).

Displaying and Analyzing Antenna Radiation Patterns (reference MSC-23210-1) is currently available for download from the TSP library.

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