Evaluation of Rotman Lenses for Space-Based Radar,
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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The Space Based Radar SBR RD 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 of measuring the permittivity of the dielectric material within the structure. This report describes the experiments performed and the results obtained.
- Active and Passive Radar Detection and Equipment