BASIC RESEARCH IN MICROWAVE DEVICES AND QUANTUM ELECTRONICS QUARTERLY PROGRESS REPORT NO.1 Period Covering May 1, 1963 to August 1, 1963

摘要

Generation-and—Amplification-Of.-Coherent Electromagnetic Energy in the Millimeter and Sub millimeter Wavelength .RegionnA preliminary survey of the physical principles and phenomena that would most likely lead to the development of new ideas for the generation and amplification of coherent electromagnetic energy in the millimeter and sub millimeter wavelength region is given .It seems that the interaction of an electron beam with electromagnetic fields in solid material (say dielectric material) offers the most obvious extension of the wall known microwave devices ;Because of their characteristic wave velocity and moderate-to-high wave impedance the titivates and ferrospinelc are considered as possible dielectric slow-wave structure for traveling-wave Interaction. Experimental investigations, of the properties of these materials at millimeter and sub millimeter frequencies will be initiated shortly.nThe analysis of the feasibility of frequency multiplication by means of passing a fast cyclotron wave into a magnetron-type cavity is given in some detail. Equations for the harmonic power output at the magnetron-type cavity in terms of some operating parameters are given.nExperimental work on extending the technique for brazing beryllium oxide to helices designed to work at frequencies of 30 Gc and higher is reported here. Some minor difficulties experienced in obtaining good thermal contact between the wire helix and the oxide and their probable remedies are discussed.nAnalysis of Amplitude and Phase Modulated Traveling Wave AmplifiersnA nonlinear analysis of simultaneous amplification of two input frequencies by a traveling-wave amplifier is given here in detail. Very complex equations for the interaction process are obtained due to the nonlinear nature of the interaction which gives rise to a cross modulation of the two input frequencies. Several approximations are introduced in order to simplify the analysis.