We will start the discussion with resolving an important problem associated with the need to separate the temperature environments for the solid state and ferrite devices from that needed for the microwave power generation. RESOLUTION OF PROBLEM OF ACHIEVING AMPLITUDE AND PHASE CONTROL OF MICROWAVE OUTPUT FROM SINGLE RADIATING MODULE WHILE MAINTAINING AN ACCEPTABLE ENVIRONMENT FOR SOLID STATE AND FERRITE DEVICES This problem was recognized in the architecture of Fig. 1 where the microwave power generation devices and the microwave antenna radiating modules are separated by a blanket of thermal insulation, and all of the solid state devices are mounted on the surface of the slotted waveguide arrays which can be maintained at an acceptable temperature for these devices. The anticipated range of temperatures for the two areas is shown in Fig. 2. In this design each of the magnetron microwave generators is equipped with a pyrolytic graphite radiator which combines the properties of low density, high heat conductivity, and high emissivity, for radiating dissipated power. The total mass of this radiator has a strong influence on the sizing of the magnetron whose mass tends to optimize at three to five kilowatts microwave output. The output of two of these magnetrons is combined in a Magic T and then fed to the slotted waveguide radiator. The use of the Magic T to combine the output of two tubes was early introduced as a means of eliminating a high power ferrite circulator which would be necessary if a single magnetron were used and combined with a ferrite circulator as a directional
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