1 Basic Concepts of Antennas 1.1Introduction 1.2Radiation Mechanism 1.3Two Kinds of Elementary Linear Sources and Huygens'Planar Element 1.4Fundamental Parameters of Antennars 2 Arrays and Array Synthesis 2.1Introduction 2.2N-Element Linear Array:Uniform Amplitude and Spacing 2.3Phased Array,Grating Lobe and Sub array 2.4N-Element Linear Array:Uniform Spacing ,Nonuniform Amplitude 2.5N-Element Linear Array:Unifo