The Sum port is the main beam of the antenna; the center of this main radar beam is known as the

The Sum port is the main beam of the antenna; the center of this main radar beam is known as the

• A. Boresight
• B. Null point
• C. Phase center
• D. Peak point

Answer: (A)

The central idea is that boresight is the centerline of the antenna’s main beam. In a phased-array radar, the Sum port combines signals from all elements to form the strongest, most extended part of the radiation pattern—the main lobe. The direction along the middle of this main lobe, where the radiation is strongest and the beam is pointed, is called the boresight. It serves as the reference direction for aiming the radar. Null point refers to a direction where the pattern is minimized, not the center of the main beam. Phase center is the effective point inside the antenna from which the phase fronts appear to originate—not the center of the beam itself. Peak point isn’t a standard term for the beam’s center.

The central idea is that boresight is the centerline of the antenna’s main beam. In a phased-array radar, the Sum port combines signals from all elements to form the strongest, most extended part of the radiation pattern—the main lobe. The direction along the middle of this main lobe, where the radiation is strongest and the beam is pointed, is called the boresight. It serves as the reference direction for aiming the radar.

Null point refers to a direction where the pattern is minimized, not the center of the main beam. Phase center is the effective point inside the antenna from which the phase fronts appear to originate—not the center of the beam itself. Peak point isn’t a standard term for the beam’s center.