A Summary of Methods for Producing Nulls in an Antenna Radiation Pattern.

摘要

The report presents a brief introductory description of adaptive nulling antenna systems and their essential components, with particular emphasis on satellite communications applications. The principal difference between the inherent performance of array and multiple-beam antennas is discussed. Bandwidth, nulling performance versus degrees of freedom, commonly used circuits, etc. are also discussed. It is pointed out that the algorithm for determining the method for combining the received signals at each of the antenna's N terminals is a most important and central issue in any system. Several algorithms are discussed and their relationship to the general least mean square (power inversion) algorithm is pointed out. Finally a new method for evaluating the performance of nulling antennas is described.