HIGH POWER FAST FERRITE SWITCHES.
Interim development rept. no. 2, 27 Sep-27 Dec 63.
SPERRY RAND CORP CLEARWATER FLA SPERRY MICROWAVE ELECTRONICS DIV
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The SPST switching elements reported in the First Quarterly Report were evaluated at medium power levels and found to be unsatisfactory because of increased insertion loss. Experiments were performed which indicated that the increased inser tion loss was caused by subsidiary resonance absorption rather than by heating effects. Investigations were then conducted to derive the optimum ferromagnetic material and waveguide geometry for the best SPST switching operation and for minimum high power effects. A 10 percent switching bandwidth has been obtained with a structure which shows no onset of subsidiary resonance effects below 150 kilowatts, and a materials trend has been established by which it is thought that operation at 1 megawatt will be achieved. Initial investigations have been made at S-band frequencies. Very low insertion loss has been obtained at low power, but 10 percent switching bandwidth has not yet been achieved. The S-band work will continue during the next quarter concurrently with the C-band effort. Design of the electromagnetic switch configuration has begun. Initial efforts indicate that the impulse type switch should be used. Investigation of methods of reducing switching time has shown that thin-walled waveguide must be used if eddy current losses are to be reduced to an acceptable level. Author