Reduced cavity wideband multi polar spiral antenna

摘要

A wideband antenna with backlobe elimination in a confined space is disclosed. Backlobe elimination is by an array of electromagnetically conductive members disposed between the spiral element and the ground plane and almost contacting the ground plane so as to bleed a backlobe away from the spiral antenna to the ground plane. In one embodiment, the members are conical elements disposed between the spiral element and the ground plane of a spiral antenna such that the apexes of the conical elements almost contact the spiral element and the bases of the conical elements contact the ground plane. In some embodiments, other means may be employed to perform this function. In operation, conical elements bleed the backlobe of the signal away from the spiral element to the ground plane.

主权项

1. A spiral antenna, comprising:
a substrate; a spiral element formed upon the substrate; a ground plane behind the spiral element; and an array of electromagnetically conductive members disposed between the spiral element and the ground plane so as to bleed a backlobe of a signal away from the spiral element to the ground plane; wherein each electromagnetically conductive member of the array of electromagnetically conductive members has an apex and a base that rests on the ground plane, wherein each base of a respective electromagnetically conductive member is in a same plane as every other base of the electromagnetically conductive members and is adjacent to at least one other base of an electromagnetically conductive member, and wherein each apex of the electromagnetically conductive members is a same distance from the ground plane.