Geometric optics radome analysis wall incorporating effects of wall curvature

Details Geometric optics radome analysis wall incorporating effects of wall curvature Geometric optics radome analysis wall incorporating effects of wall curvature

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1874...31k&link_type=abstract

Proc. SPIE Vol. 1874, p. 31-43, Infrared and Millimeter-Wave Engineering, Harold T. Buscher; Ed.

Physics

Optics

Scientific paper

In this research, a principal unmodeled error contributor in radome analysis is identified as the local plane approximation at the ray intercept point. An improved approach to modeling and computing the effects of the radome wall was developed which improves the radome wall transmission wall analysis in three respects: use of surface integration, utilization of a divergence factor (DF) to account for wall curvature, and incorporation of the effects of multiple refraction (MR). Modeling an incident plane wave on an external reference plane as an ensemble of Huygen's sources, geometric optics is used to trace the fields from the reference plane through the radome wall to a receiving monopulse antenna, where the wall transmissions on each ray are collected. The fact that the integration of a bundle of rays through the radome wall, as opposed to a single ray, more densely samples the curvature variation results in a more robust model. A DF derived from Snell's law for spherical shells accounts for the local wall curvature at the ray intercept point. To validate the approach, a microwave measurement setup was assembled around a network analyzer. Swept frequency data were obtained for similar monolithic wall dielectric panels but with different wall curvatures. Comparisons were then with measured data and the predictions of the model herein.

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