High Power X-Band Monopulse Tracking Feed for the Lincoln Laboratory Long-Range Imaging RADAR

This paper covers the design, development, and test of a 10-GHz 10-percent bandwidth high-efficiency feed system to be used in a 120-ft Cassegrainian antenna for the M.I.T. Lincoln Laboratory Long Rang Imaging RADAR. The feed is a multimode monopulse tracking feed employing a multifare horn and is capable of transmitting a power level of 800 kW at 50-percent duty. The feed will operate in both right- and left-hand circular polarization simultaneously or in both vertical and horizontal polarization simultaneously depending on the input network.