Discussion
Why does dividing power among many elements not reduce the total radiated power?
Answer: B
A passive feed simply distributes the available power, so the sum of the element powers is the input power less network loss, and the array radiates all of it. What changes is the direction in which it goes: the same power concentrated into a narrower beam. Passive elements amplify nothing, matching affects how much enters rather than how much is shared, and coupling redistributes power between elements rather than returning it. Gain is redistribution, not creation, and an array is the clearest demonstration of the point.
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