An experimental investigation into low gain TT and C S band antennas

Two breadboard models of cardioid coverage TT and C antennas were analyzed and tested in order to improve their electrical performances. These antennas were tested both when isolated and when mounted on a spacecraft mock-up. Results obtained based on specification requirements are compared with a reference antenna. Of the two configurations examined (antenna A, with skirt, giving 120 deg half-angle coverage and antenna B, without skirt, giving approximately 140 deg coverage), both showed improvement. A modified coupler intended to improve the feeding network was also added to the system. Mathematical modeling is described and good agreement between theoretical and experimental results is shown.