THE RADIATION PATTERN OF A RADIATOR PLACED NEAR AN ELLIPTICAL CYLINDER AS A FUNCTION OF THE CYLINDER PARAMETERS
Radiation directivity is examined for cases such as an electric radiator oriented along the axis of the elliptical cylinder, an electric radiator oriented at right angles with the axis of the elliptical cylinder, and a magnetic radiator oriented along the cylinder axis (a longitudinal slot), and placed on the surface of the elliptical cylinder. For formula derivation, the field is determined in the space surrounding the cylinder as a function of incidence angles of a plane wave at the cylinder. A radiation pattern of a receiving antenna placed at some point is determined. from the principle of reciprocity, the radiation pattern of the radiator placed near the cylinder is determined. Formulas are presented for calculating the radiation patterns in a plane perpendicular to the cylinder axis. The formulas establish a relationship between the radiation pattern and the size and parameters of the cylinder. Estimated radiation patterns are presented which illustrate the dependence of the radiation pattern on factors such as radiator placement with respect to the cylinder, eccentricity of the cylinder cross- section, cross-section perimeter, and cylinder-radiator distance. Experiments were needed to clarify how much of the error in calculations was due to the assumption of an infinitely long cylinder. A comparison of experimental data with calcualtions howed that, with a short cylinder, the discrepancy is considerable, particularly in the rear half-space. A good agreement was obtained with cylinders up to 4 lambda long for the case of electric radiator and up to 2 lambda long for the slot (in the latter case, the cylinder turned into a strip, because the elliptic cylinder had unity eccentricity). (TCO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-14-000782
- OSTI ID:
- 4197743
- Journal Information:
- Trudy Moskov. Energet. Inst., Journal Name: Trudy Moskov. Energet. Inst. Vol. Vol: 21
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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