An Experimental Study of the Breakdown Characteristics of Microwave and VHF Antennas. Volume 1 of 2
Final rept. Jul 1967- Jul 1968
LITTON SYSTEMS INC BEVERLY HILLS CA SPACE SCIENCES LABS
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The document is part of the final report describing an investigation of the breakdown characteristics of selected microwave and VHF transmitting antennas under both cold air and simulated re-entry conditions. The purpose of the program was to provide experimental data which will aid in the selection of re-entry jammers. Of particular interest were the power-handling capabilities, the pattern of the radiated fields, and the input impedance, of antennas which are compatible with the geometry of a conical re-entry vehicle. The report describes the investigation of a microwave slot antenna. The microwave antenna consisted of a teflon-filled X-band slot, located on a conical surface which served as a conducting plane. The microwave experiments consisted of performing initiate and extinguish breakdown tests with both cold gas, and a plasma environment over the antenna. Transmitted and reflected power measurements were also made, together with preliminary ablation tests. The antenna plasma tests were conducted in the large size, steady state, plasma flow environment produced by an electrodeless MHD plasma accelerator.
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