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Electromagnetic Resonant Behavior of a Confocal Spheroidal Cavity System in the Microwave Region

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2 Author(s)
Simons, J.C. ; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts ; Slater, J.C.

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The resonance of a small spheroidal object in a large spheroidal cavity is investigated. This approximates the case of a thin needle‐like antenna in a large cavity. It is shown that this needle, if thin enough, shows marked resonant properties, in that when the cavity is tuned to a resonant frequency defined by the needle, the magnetic field on the surface of the needle is greatly enhanced. This property can be used in a practical way, in measuring surface impedance of the material of which the needle is composed: at resonance most of the loss in the cavity is located at the surface of the needle and depends on the material of which it is composed.

Published in:

Journal of Applied Physics  (Volume:23 ,  Issue: 1 )

Date of Publication:

Jan 1952

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