Analysis of Dielectric Slab-Covered Waveguide Arrays on Large Cylinders
RAYTHEON CO BEDFORD MA MISSILE SYSTEMS DIV
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An infinite array model is developed, which shows that there are only minor differences between the pattern of an element in a dielectric clad cylindrical array and that of an element in the corresponding planar array. This result suggests that the coverage of a finite dimension array over a cylinder of large radius can be evaluated with good approximation by the means of a planar array model. The coverage of arrays in an infinite ground plane covered by dielectric is predicted by developing a model which takes into account several waveguide modes in matching the fields at the array aperture interface. This model does not require the inversion of large matrices in determining the mutual coupling between array elements, thus permitting the analysis of relatively large arrays. This model shows that no coverage in the endfire direction is obtainable from these structures. To achieve endfire coverage the dielectric sheet covering the array must be of finite dimension.
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