Dynamic null steering in an ultrawideband time-steered array antenna

作     者：Frankel, MY Esman, RD 

作者机构：USN Res Lab Div Opt Sci Washington DC 20375 USA 

出 版 物：《APPLIED OPTICS》 (应用光学)

年 卷 期：1998年第37卷第23期

页      面：5488-5494页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：Beam shaping Beam steering Light beams Optical elements Phase shift Ultrawideband signals 

摘      要：We develop a method for forming squint-free wideband nulls in the antenna pattern of an ultrawideband array antenna. The technique uses an optical dispersive-prism beam former to provide time-delayed microwave signals to each antenna element for forming a squint-free main bean. The amplitude-modulated optical carrier is propagated through a set of optical Links. Each link feeds an array element and includes an amount of dispersion proportional to element position. Tuning the wavelength of the optical carrier controls the microwave signal s arrival-time delay gradient across the array. A dispersive-prism tapped delay-line microwave filter is used to frequency shape a nulling signal. The wideband nulls do not significantly distort the main beam and are steered independently of the main beam. The technique is applied to sidelobe nulling for a transmitter and for jammer suppression for a receiver array. (C) 1998 Optical Society of America.