Sidelobe Modulation in Far-Field Radiation Patterns

摘要

In this research, the following problem is addressed: How can low sidelobes in the distant electric field or power pattern be achieved via time-modulation of the element values in a linear phased array. Time-modulation of the N array element values can result in far-field patterns whose sidelobes are severely modulated. This procedure can produce sidelobes which on the average are very low. In this research, ON/OFF switchings are programmed in a predetermined sequence to produce a specified far-field pattern with equal and ultra-low sidelobe levels. In addition, the mainbeam of the far-field pattern is kept fairly fixed. A FORTRAN program is developed to produce ON and OFF times for this modulation scheme, given a specific value of array length (N) and a desired sidelobe level (PK).