Journal
PROCEEDINGS OF THE IEEE
Volume 104, Issue 3, Pages 504-518Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPROC.2016.2515122
Keywords
Phased arrays; photonic beamformers; true time delay (TTD)
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This paper reviews the topic of true time delay (TTD) and its importance and implications in wideband imaging phased arrays. The paper describes an early analog version of TTD using the Rotman lens, discusses various architectures, and talks about photonic implementations. Also emphasized are the differences in design between narrow-band arrays which are calibrated at individual frequencies and wideband imaging arrays where TTD is necessary.
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