Which statement describes a Passive ESA?

Which statement describes a Passive ESA?

• A. Gimbled phased beam movement, one transceiver
• B. Phased beam steering, multi-track
• C. Mechanical movement with two transceivers
• D. Fixed beam with no scanning

Answer: (A)

A Passive ESA is defined by steering the beam without using multiple active transmitter channels, relying instead on mechanical movement of the antenna system with a single feed. The gimbaled arrangement moves the entire phased-beam formation to point in different directions, while one transceiver provides the transmit/receive function. This setup keeps the active elements limited to a single source and uses mobility to scan the space. So the statement that describes this best is the one that mentions gimbled phased beam movement with one transceiver. The other descriptions imply multiple transceivers or purely electronic steering, or no scanning at all, which do not match the passive arrangement.

A Passive ESA is defined by steering the beam without using multiple active transmitter channels, relying instead on mechanical movement of the antenna system with a single feed. The gimbaled arrangement moves the entire phased-beam formation to point in different directions, while one transceiver provides the transmit/receive function. This setup keeps the active elements limited to a single source and uses mobility to scan the space.

So the statement that describes this best is the one that mentions gimbled phased beam movement with one transceiver. The other descriptions imply multiple transceivers or purely electronic steering, or no scanning at all, which do not match the passive arrangement.