A TEM lens antenna is described that provides the capability of generating 61 low-sidelobe dual-polarized beams over a 17° field of view, at both 4 and 6 GHz. Isolation between these beams is examined, and it is concluded that 6 of the available 61 beams may be used simultaneously in many different positions, while maintaining at least 27 dB isolation, for a total of 12 times frequency reuse.
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Scott et al. (1977) studied this question.