Discussion
What is true time delay steering?
Answer: A
Replacing each phase shifter with an actual delay line makes the steering frequency independent, so a wideband signal is not squinted. It is more expensive and bulkier, which is why phase steering is used wherever the bandwidth allows. Mechanical rotation and beam switching are alternative approaches to pointing, and amplitude alone can shift a beam only in the crude sense of a monopulse comparison rather than steering it continuously. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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