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Is it possible to super-impose two or more signals all sent from different directions as a standing wave with the resulting summed wave occupying a fix area of space that is also a complex area? Do you understand my question? It is not obvious probably what i am trying to say-feel free to ask for more of an explanation.

These signals could be electro magnetic waves or micro waves designed to pass thru solid objects under normal circumstances but then excite the solid only when at a certain frequency - this excite frequency would come about when two or more signals interact within the solid.

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