Which statement about phased array use in space-based systems is true?

Which statement about phased array use in space-based systems is true?

• A. It is primarily used to reduce bandwidth
• B. It enables multiple beams and high EIRP with tracking
• C. It eliminates the need for ground stations
• D. It provides passive cooling for satellites

Answer: (B)

Phased array capability on satellites centers on steering and shaping beams electronically, without moving the spacecraft. By adjusting the relative phase (and amplitude) of many antenna elements, the array forms a narrow, high-gain beam in a chosen direction and can sweep to track a moving target. This lets the system create multiple beams at once, serving different ground terminals or regions, while concentrating more power into each beam to raise the effective radiated power in that direction (high EIRP). The electronic steering also enables rapid tracking as relative geometry changes, maintaining a solid link without mechanical repositioning. Bandwidth is not inherently increased or reduced by beamforming, and ground stations are still needed for uplink/downlink and mission control. Phased arrays do not provide passive cooling.

Phased array capability on satellites centers on steering and shaping beams electronically, without moving the spacecraft. By adjusting the relative phase (and amplitude) of many antenna elements, the array forms a narrow, high-gain beam in a chosen direction and can sweep to track a moving target.

This lets the system create multiple beams at once, serving different ground terminals or regions, while concentrating more power into each beam to raise the effective radiated power in that direction (high EIRP). The electronic steering also enables rapid tracking as relative geometry changes, maintaining a solid link without mechanical repositioning.

Bandwidth is not inherently increased or reduced by beamforming, and ground stations are still needed for uplink/downlink and mission control. Phased arrays do not provide passive cooling.