Patent ID: 8760356

Claim:
A broadband radiation unit, comprising: first and second pairs of symmetric dipoles operable to transmit communication signals and to receive communication signals, the first pair of symmetric dipoles having a polarization that is orthogonal to that of the second pair of symmetric dipoles, the first and second pairs of symmetric dipoles together defining an annular structure; and a plurality of baluns that are associated with the first and second pairs of symmetric dipoles such that a given one of the plurality of baluns is associated with a respective symmetric dipole of the first and second pairs of symmetric dipoles, each one of the plurality of baluns feeding a balanced current to its associated symmetric dipole, wherein each symmetric dipole of the first and second pairs of symmetric dipoles has two circularly cross-sectioned unit arms disposed on and arranged symmetrically with its associated balun, each balun includes two parallel elongated connection members, each elongated connection member is provided with a line slot into which electrical lines are receivable for connecting respective symmetric dipoles, one end of each elongated connection member is disposed on an annular base whereas another end thereof is transversely connected with a respective unit arm, a distal end of each unit arm is provided with a tuning bar, a circularly cross-sectioned loading post is extended downwardly from a distal end of a respective tuning bar, each one of the unit arms includes a plurality of tuning bars, and a cross-sectional area of each tuning bar is greater than a cross-sectional area of the unit arm.