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3 Dimensional representation of effect on cavity resonance fields by introduction of absorber

Empty Cavity

Above is a representation1 of the resonant H fields in an empty cavity. Cavity dimensions are 3"x5"x0.8". Note that the field strength is spread throughout the cavity.


 

Cavity with Absorber

This is a representation1 of the field strength within a cavity with a thin sheet of high permittivity-high permeability absorbent material is added along one wall. Note how the energy resides primarily in the material rather than interfering with circuitry in the cavity.

1 - images developed using CST Microwave Studio www.cst.com