Optical True Time-Delay for Two-Dimensional X -Band Phased Array Antennas

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...

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Bibliographic Details
Published in:IEEE photonics technology letters 2007-06, Vol.19 (12), p.877-879
Main Authors: Jung, Byung-Min, Shin, Jong-Dug, Kim, Boo-Gyoun
Format: Article
Language:English
Subjects:
Antenna arrays
Antenna feeds
Beamforming networks
Delay effects
Delay lines
Microelectromechanical systems
Micromechanical devices
Optical arrays
optical microelectro mechanical system (MEMS)
Optical switches
phased array antennas (PAAs)
Phased arrays
true time-delay (TTD)
Two dimensional displays
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Summary: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
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2007.897530