초록 ▼

A circularly polarized (CP) antenna comprised of at least one antenna bay. Each bay includes three individual CP antennas which are equally spaced circumferentially about a mast. Each individual CP antenna is comprised of a pair of crossed dipoles having drooping arms. The angle at which the arms dr

A circularly polarized (CP) antenna comprised of at least one antenna bay. Each bay includes three individual CP antennas which are equally spaced circumferentially about a mast. Each individual CP antenna is comprised of a pair of crossed dipoles having drooping arms. The angle at which the arms droop is selected to provide good axial ratio at all positions in the vertical and horizontal patterns. Three reflectors extend radially from the mast and are arranged at circumferential positions intermediate the individual CP antennas. In one embodiment, six antenna bays of this type are provided at axially spaced positions along a single, common mast. An arrangement for feeding this multi-bay antenna is also disclosed.

대표청구항 ▼

A circularly polarized antenna bay comprising a single vertically oriented support mast having a longitudinal axis, three generally planar reflectors, each disposed with respect to said mast such that said longitudinal axis of said support mast essentially lies within said plane of said reflector, w

A circularly polarized antenna bay comprising a single vertically oriented support mast having a longitudinal axis, three generally planar reflectors, each disposed with respect to said mast such that said longitudinal axis of said support mast essentially lies within said plane of said reflector, whereby said reflectors extend radially from said support mast, said reflectors being equally spaced circumferentially about said mast so as to define three ground planes generally parallel to said mast and equally spaced circumferentially thereabout, said reflectors being wholly supported by said mast, three pairs of crossed dipoles, and means for feeding said pairs so that each radiates circularly polarized electromagnetic waves, said pairs each being located at circumferential positions intermediate said reflectors and each including radiating elements extending generally across the corresponding said ground plane but with said radiating elements each extending towards said ground plane at angles selected so as to substantially equalize the E and H plane patterns thereof.