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Applied Optics

Applied Optics


  • Vol. 37, Iss. 23 — Aug. 10, 1998
  • pp: 5488–5494

Dynamic null steering in an ultrawideband time-steered array antenna

Michael Y. Frankel and Ronald D. Esman  »View Author Affiliations

Applied Optics, Vol. 37, Issue 23, pp. 5488-5494 (1998)

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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 beam. 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.

© 1998 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(200.3050) Optics in computing : Information processing
(200.4650) Optics in computing : Optical interconnects
(280.5110) Remote sensing and sensors : Phased-array radar
(280.5600) Remote sensing and sensors : Radar

Original Manuscript: December 18, 1997
Revised Manuscript: March 12, 1998
Published: August 10, 1998

Michael Y. Frankel and Ronald D. Esman, "Dynamic null steering in an ultrawideband time-steered array antenna," Appl. Opt. 37, 5488-5494 (1998)

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