FAR-FIELD PATTERN PREDICTION FOR SHIPBOARD ANTENNAS
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB
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Shipboard antennas operate in the vicinity of the ships super- structure which consists of numerous metallic scatterers of various sizes and shapes. The far-field patterns of shipboard antennas are perturbed by these scatscatterers and are therefore difficult to predict. In this report a method is discussed for approximating the far-field pattern in the horizontal plane of a thin vertical antenna e.g., a whip antenna near cylindrical scatterers of arbitrary cross-section whose physical heights are at least that of the antenna. The method is based on approximating the antenna with an infinite line source and the scatterer with an array of thin infinite wires. Some representative calculated and experimental results are presented which generally show very good agreement between the predicted and measured patterns. In addition, limitations of the method are discussed and the computer programs for calculating the far-field patterns are explained in some detail.
- Radiofrequency Wave Propagation
- Electrical and Electronic Equipment