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Microwave Detection in a Thermionic Diode

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1 Author(s)
Redhead, P.A. ; Radio and Electrical Engineering Division, National Research Council, Ottawa, Canada

A theoretical analysis of the detection of microwave energy in a thermionic diode is presented assuming a parabolic space-charge potential distribution and that the resultant field acting on the electron is the sum of the static and radio-frequency fields. It is shown that at microwave frequencies the space-charge-limited diode behaves as a velocity-modulated detector. This solution is a valid approximation for signal frequencies in excess of the electron plasma frequency at the potential minimum and for signal amplitudes less than 2Vm/d s[1+(¿2/¿2)]1/2. Here s is the diode spacing, d the potential minimum spacing, the angular frequency, Vm the potential at the minimum and ¿2=2eVm/md2.

Published in:

Proceedings of the IRE  (Volume:43 ,  Issue: 8 )