Aerodynamic Studies of Antenna Breakdown, Part I.
Final rept. 15 Jan 67-14 Jan 69,
MASSACHUSETTS INST OF TECH CAMBRIDGE AEROPHYSICS LAB
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Work performed during 1967 and 1968 on the transmission and radiation characteristics of antennas on the surface of a plasma-covered wind tunnel model is reported. The model used is a blunted cone-cylinder operated in a supersonic wind tunnel at M 4, P sub o 1.2 psia and T sub o 100F. The plasma sheath is obtained by injecting nitrogen plasma from a DC arc jet located in the model nose. The effect of the plasma on X-band and S-band antennas located on the model surface was studied and it was found that the breakdown power and transmitted power of an X-band slot were greatly reduced by the plasma layer. The presence of the plasma layer was also found to increase the VSWR of an S-band slot from 1.2 to 20. Some development efforts associated with improvement of the arc jet are also presented. Author
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