Evaluation of Rotman lenses for space-based radar / by J.W. Moffat. : DR52-17/68-1995E-PDF

"The Space-Based Radar (SBR) R&D Project at DREO has been investigating the feasibility of the application of a number of different technologies to space-based wide area surveillance using microwave radar. One of the technologies investigated was the Rotman lens implementation of a Fourier transform beam forming network. A number of Rotman lenses were designed and manufactured in stripline microwave structure under a development contract. The expected performance was not achieved. A study was initiated to investigate possible causes of this performance deficiency. This study was divided into two main thrusts. First the lenses were assessed physically using ultrasonic and X-ray technologies, with a confirmation of the results by the sectioning and subsequent microscopic examination of one of the lenses. Following that, some simple stripline structures were measured in a microwave lab in order to gain an understanding of the difficulties measuring the permittivity dielectric material within the structure. This report describes experiments performed and results obtained"--Abstract, page iii.

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