Lossy-feed networks in multiple-beam arrays

Abstract

Using a lossy-feed network in a multiple-beam array antenna, particularly a receiving system without active amplifying components embedded in the network, has generally been avoided. Attention is called to certain antenna pattern characteristics that should be evaluated with respect to the system application involved. Lossless-feed networks often possess one or more of these pattern characteristics which can possibly be enchanced when the capabilities of a lossy network are properly traded off. Maximizing available antenna gain at the beam crossover points, for example, is shown to be one possible advantage for employing a lossy network instead of a lossless design. Near-in sidelobe levels can readily be controlled with a lossy network.