Abstract
The use of fiber optics for the control and distribution of signals within microwave phased-array antenna (PAA) systems has been investigated for many years.1 For wide-bandwidth applications, true time-delay (TTD) control, rather than simple phase shift, is required in order to prevent beam 'squint'2 at the extremes of the scan. In optical RF beamforming networks the required delay is produced by switching the optical carrier, with the RF signal impressed on it as an intensity modulation, through an appropriate length of optical fiber.
© 1996 Optical Society of America
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