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Difference between active phased array and passive phased array

This page compares active phased array vs passive phased array and mentions difference between active phased array and passive phased array.

Introduction:
The structure composed of collection of radiation elements which are fed with specific amplitude and phase is known as array antenna. The EM fields from these individual radiation elements are combined to form radiation pattern at a specific distance from them. It forms radiation pattern in far field region. In Phased array antenna, main radiation beam can be altered electrically in any desired direction by varying excitation phases of individual EM waves fed to the radiation elements.
Refer phased array basics and types >> for more information.

Active Phased Array

active phased array

• The figure-1 depicts active phased array antenna.
• Highest performance
• Effective radar resource management
• Low distribution loss
• Highest cost

Passive Phased Array

passive phased array

• The figure-2 depicts passive phased array antenna.
• Beam agility
• Effective radar resource management
• High distribution loss
• Higher cost

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