Which of the following is a capability of phased array antennas?

• A. Beam Forming, tracking, multiple beams, high reliability, high EIRP, nulling
• B. Low complexity and low cost
• C. No need for feed distribution
• D. Single fixed beam unable to track

Answer: (A)

Phased array antennas control the direction and shape of the radio beam by adjusting the phase and amplitude across many radiating elements. This lets you form and steer beams electronically, so you can point the main beam toward a target without any mechanical movement. Because steering is electronic, the array can track a moving satellite quickly and smoothly. You can also form multiple beams at once, covering different directions or supporting multiple channels, which is a natural capability of the array when you apply different weightings to the elements. The absence of moving parts contributes to higher reliability, and coherently combining the signals from all elements concentrates power in the chosen direction, giving high EIRP. Additionally, adaptive weighting allows placing nulls in directions of interference, reducing jamming or unwanted signals while keeping the desired beam strong. Things that claim low complexity or no feed distribution ignore the need for a distributed feed network, and a single fixed beam that cannot track contradicts the fundamental advantage of electronic beam steering.