| abstract |
A receiving antenna of the array has nested upper loops 91, 92 with offset centres C1, C2, and nested lower loops 93, 94 with offset centres C3, C4, loops 91, 93 and loops 92, 94 forming respective figure eight configurations. The loops 91 to 94 are all electrically in series and all wound in a clockwise sense, with loops 91, 92 of one phase opposite to the phase of loops 93, 94 The receiving antenna has only a single null zone (Fig 12 - II) and is housed with a transmitting antenna in a cavity of a pedestal (301), (Fig 14), defined by plastics shells (302), (303). Urethane foam (307) is used to fill cavity void space and to surround the antennas (304), (305). <IMAGE> |