Measurements of Far-Field Radiation Patterns in the Near-Field of a Radiating Lens Fed with a Goubau Beam-Waveguide

摘要

The purpose of this report is to present the results of an experiment designed to measure the far-field radiation pattern of a radiating lens fed by a Goubau beam-waveguide in the near-field. The aperture diameter of the radiating lens is 50 wavelengths. The experiment was performed at a frequency of 71.5 Gc. The transmitting and test antennas was separated by a minimum distance of 30 feet to measure far-field patterns. For the experiment lenses were designed which give, approximately, a plane phase front at distances of 2.5 feet, 5 feet, and 10 feet from the transmitting antenna. This correcting lens is placed flush with the radiating lens of the test antenna. The lens design, and the experimental results are given.