| 摘要 |
The invention provides a novel LOS dipole antenna arrangement which permits substantial improvement in pattern characteristics by correspondingly reducing spurious coupling to adjacent structure, which may occur particularly where the antenna is situated closely adjacent to unrelated structure in a space-restricted environment. Pattern improvement is based on the principle of the antenna's symmetry being rigorously maintained, wherein a pair of adjacently arranged cylindrical radiators are fed by a double-ended balun structure created from the supporting and cable feed-through antenna mast. This balun feed assembly comprises a pair of oppositely arranged slots within the antenna cylindrical radiators, with each conductor of the coaxial feed cable running to the balun being coupled to either side of one of the slots proximate the center thereof. The excitation energy is transferred to the cylindrical radiators by way of symmetrically placed radial posts extending from either side of the energy-coupled slot to the inside of the cylinders.
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