Accession Number:

ADA230501

Title:

Predicting the Performance of Airborne Antennas in the Microwave Regime

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

• Carroll, David P.

Report Date:

1990-12-01

Pagination or Media Count:

109.0

Abstract:

This study investigated the application of a high-frequency model Uniform Geometrical Theory of Diffraction of electromagnetic sources mounted on a curved surface of a complex structure. In particular, the purpose of the study was to determine if the model could be used to predict the radiation patterns of cavity-backed spiral antennas mounted on aircraft fuselages so that the optimum locations for the antennas could be chosen during the aircraft design phase. A review of literature revealed a good deal of work in modeling communications, navigation, identification antennas blade monopoles and aperture slots mounted on a wide variety of aircraft fuselages and successful validation against quarter-scale model measurements. This study developed a monopole-array model of a spiral antennas radiation at vertical polarization and an ellipsoid-plate model of the FB-111A. Using the antenna and aircraft models, the existing Uniform Geometrical Theory of Diffraction model generated radiation patterns which agreed favorably with full-scale measured data. The study includes plots of predicted and measured radiation patterns from 2.5 to 15 Gigahertz. Theses rrh

Descriptors:

• *POSITION(LOCATION)
• POLARIZATION
• OPTIMIZATION
• AIRCRAFT
• VALIDATION
• MODELS
• THEORY
• AIRBORNE
• THESES
• CAVITIES
• IDENTIFICATION
• SURFACES
• CURVATURE
• NAVIGATION
• VERTICAL ORIENTATION
• ELECTROMAGNETIC RADIATION
• ANTENNAS
• FUSELAGES
• GEOMETRY
• COMMUNICATION AND RADIO SYSTEMS
• SPIRAL ANTENNAS
• AIRCRAFT MODELS
• MICROWAVE FREQUENCY
• RADIATION PATTERNS
• RADIATION

Subject Categories:

• Electrical and Electronic Equipment
• Optics
• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE