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Ferrite Microwave Detector

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3 Author(s)
Jaffe, D. ; Diamond Ordnance Fuze Labs., Washington 25, D.C. ; Cacheris, J.C. ; Karayianis, N.

In treating the behavior of the magnetic moments of unbalanced electron spins in ferromagnetic materials under the action of an rf field, second-order terms in the alternating components are usually neglected. It is shown here that retention of certain second-order terms for one component of the magnetization predicts the possibility of using ferrites to detect an amplitude-modulated microwave signal. The demodulated envelope can be used to magnetostrict a long thin ferrite rod, the vibration of which can be observed by means of a polarized BaTiO3 ceramic rod. The results obtained with an experimental model of this device indicate verification of the theory. Factors which are expected to improve performance are discussed.

Published in:

Proceedings of the IRE  (Volume:46 ,  Issue: 3 )