Forms of the reciprocity theorems are used in many electromagnetic applications, such as analyzing electrical networks and antenna systems.- Reciprocity (electromagnetism)
Since antennas obey reciprocity the same radiation pattern applies to transmission as well as reception of radio waves.- Antenna (radio)
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In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other source.
This is a consequence of the reciprocity theorem of electromagnetics and is proved below.