Patent ID: 6833812
Filing Date: 2004-12-21
Classification: H01Q

Abstract:
An antenna system, comprising:an array of radiating elements; a control system for generating differential-mode voltages or differential-mode currents for exciting the radiating elements; and a device for feeding the differential-mode voltages or differential-mode currents to the radiating elements, wherein the differential-mode voltages or differential-mode currents are applied to the radiating elements to generate a radiation beam that exploits mutual coupling among the radiating elements in the array, wherein the control system comprises a computer for performing the steps of (i) calculating a matrix of complex numbers that is dependent on a direction of observation of radiation intensity emitted by the antenna system and on a geometry of the array of radiating elements, but is independent of voltage or current excitations of the array, wherein the matrix describes radiation in a far field and reflects mutual coupling effects of each radiating element in the array among all of the other radiating elements in the array, and (ii) calculating a radiation intensity in the direction of observation using the calculated matrix, and actual voltages or currents fed at each of the radiating elements in the array.