THEORETICAL AND EXPERIMENTAL INVESTIGATIONS TO DEVICES METHODS FOR OBTAINING DYNAMIC PATTERN DATA FOR ANTENNA SYSTEMS

摘要

The purpose of this report is to describe a system that has been devised to determine pattern shape information for the antenna associ¬ated with a particular type of ground based, medium range radar. The information that has been gathered in evaluating three of these antennas located in different areas is also included along with a detailed dis¬cussion of these data.nIt was determined that several types of man made and natural ob-structions had a noticeable effect on the radiation characteristics of these antennas. It was also noted that the radiation characteristics of the antenna varied as a function of time.nThis seems to imply not only the necessity of evaluating an -antenna after it has been installed at a site, but also it may be advisable to evaluate these operational antennas on a continuous basis or at certain time intervals. The proper evaluating program would depend on the magnitude and the rapidity of the change of the pertinent antenna characteristics as a function of time.