NDLI: Optical True Time-Delay for Two-Dimensional <formula><tex>$X$</tex> </formula>-Band Phased Array Antennas

Content Provider	IEEE Xplore Digital Library
Author	Byung-Min Jung Jong-Dug Shin Boo-Gyoun Kim
Copyright Year	1989
Abstract	An optical true time-delay (TTD) scheme for two-dimensional (2-D) X-band phased array antennas (PAAs) has been proposed. It is composed of a multiwavelength optical source and a delay line matrix consisting of 2times2 optical microelectromechanical system (MEMS) switches with fiber-optic delay lines connected between cross ports. A 2-bit times 4-bit optical TTD for 10-GHz 2-D PAAs has been implemented by cascading a wavelength-dependent TTD (WD-TTD) with a unit time delay of 12 ps in the x-direction and a wavelength-independent TTD (WI-TTD) with that of 6 ps in the y-direction. The time delay error for WD-TTD was measured to be less than 2.8 ps, mainly due to jitter incurred from gain-switching. On the other hand, the error for WI-TTD was less than 0.8 ps, which is within the equipment resolution. Insertion loss of both delay line matrices was less than 1 dB due to the column-wise control of the MEMS switches. This prevents the feed current applied to each antenna element from fluctuating at any radiation angles so that antenna gain and sidelobe level do not deteriorate in this scheme
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	877
Ending Page	879
Page Count	3
File Size	277731
File Format	PDF
ISSN	10411135
Volume Number	19
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay lines Phased arrays Optical arrays Delay effects Antenna feeds Two dimensional displays Antenna arrays Microelectromechanical systems Micromechanical devices Optical switches true time-delay (TTD) Beamforming networks optical microelectro mechanical system (MEMS) phased array antennas (PAAs)
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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