Accession Number:

AD0260113

Title:

A BRIEF INVESTIGATION OF THE EFFECT OF AN IONIZED LAYER AROUND A VEHICLE OF THE TRANSMISSION OF MICROWAVE SIGNALS

Descriptive Note:

Corporate Author:

OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB

Personal Author(s):

Report Date:

1961-04-15

Pagination or Media Count:

1.0

Abstract:

An approximate analysis of the power transmission coefficient of an i nized layer surrounding a sp erically blunted nose cone type vehicle was performed for three frequencies 30, 33, and 36 kmc. The analysis was done by using the best available aerodynamic data at various stations of the vehicle. It was found that other than in the stagnation region, better than approximately 89 of the incident power in the case of normal incidence can be transmitted through the layer and, in general, the higher the signal frequency for the frequency range under investigati n, the higher the transmission. The effect of the ionized layer on the antenna field pattern can be predicted by using Lorentz reciprocity relationship. The beam tilt of an antenna pattern caused by the presence of the ionized layer was computed for the case of an ideally narrow pencil type beam. Again, using the best available aerodynamic data, a beam tilt of less than 0.6 degrees can be expected for the signal frequencies within the range of 30 to 36 kmc. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE