The radiation characteristics of symmetric parabolic antennas with a peripherical flange are examined in detail in order to assess the effectiveness of such a flange in reducing the backward scattered field. It is shown that the best behavior is obtained by using a right-angled flange, which allows achievement af a significant field level reduction in a wide rear angular sector, without affecting the field radiated in the forward directions.
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Bucci et al. (1982) studied this question.
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