Abstract
For many years it has been common practice to use reflection loss defined for device to characterize material, a tradition which confused film with material and caused many problems. By energy conservation for film and replacing the flawed theory of impedance matching theory with wave superposition theory, the real mechanism of absorption for film has been revealed and been successfully represented using simple geometry. The wave superposition effect can be separated into angular and amplitude contributions which provide irrefutable evidence that film and material are different. It is shown that effects on absorption efficiency such as wave superposition and energy conservation only function when the material for the film absorbs microwaves. The reason that the most efficient absorption occurs when the two beams reflected from the two interfaces of the film are out of phase by π at the point where they both enter the open space while the least efficient absorption occurs when the two beams are in phase has been identified for the first time.
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