Accession Number:

AD0912951

Title:

Radiating Capability of ECM Antennas.

Descriptive Note:

Final rept. 1 Jun 72-31 May 73,

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

Report Date:

1973-06-01

Pagination or Media Count:

19.0

Abstract:

This report describes results of tasks performed after the issuance of Interim Technical Report 1, entitled Effects of Plasma on Polyrod Antenna. The majority of this remaining effort consisted of measurement of the power-handling capability of two S-band polyrod antennas for use inside sharp nose cones, and extrapolation of these data to reentry conditions for the critical part of the reentry trajectory. It was determined that air-filled voids adjacent to the polyrod just outside the waveguide possess the lowest input-power threshold. For the thinner antenna dielectric constant of 5 the threshold at the worst pressure is 1.4 kW, and for the thicker antenna dielectric constant of 2.55 it is 1.7 kW. Breakdown outside the nose cone in the heated boundary layer would be expected at approximately 1.8 kW for the worst-case heatingpressure combination. Additional antenna-breakdown thresholds were estimated for some conical zig-zag UHF and VHF antennas being fabricated by the sponsor. Author

Subject Categories:

  • Electrical and Electronic Equipment
  • Radio Countermeasures

Distribution Statement:

APPROVED FOR PUBLIC RELEASE