Discussion
Why are array elements often measured in place rather than in isolation?
Answer: A
Coupling to its neighbours alters both the impedance an element presents and the pattern it radiates, so the embedded or active element pattern is the meaningful one. Predicting scanned performance from an isolated measurement can be badly wrong, and scan blindness would not appear at all. Chamber availability, excitation difficulty and convenience are practical matters rather than the reason. The general principle is that a component in a system should be characterised in the system.
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