| 摘要 |
PCT No. PCT/GB85/00579 Sec. 371 Date Oct. 3, 1986 Sec. 102(e) Date Oct. 3, 1986 PCT Filed Dec. 12, 1985 PCT Pub. No. WO86/03624 PCT Pub. Date Jun. 19, 1986.An omni-directional aerial, more especially for the reception of domestic television programs in the U.H.F. band, comprises four folded dipole elements (1-4), each formed as a self-supporting open-ended wire loop (1A, 1B, 1C, 1D) integral with twin feeder portions (1E, 1F; 2E, 2F; 3E, 3F; 4E, 4F). The loops are arranged in planes parallel to a common central axis and are regularly angularly displaced about this axis so that opposed pairs of loops lie in parallel planes. The twin feeder portions (1E, 1F; 2E,2F; 3E,3F; 4E,4F) are connected in common to respective terminal means at the central axis, and each pair of feeder portions of each loop extend parallel to one another in a plane radial to the central axis which enables simple matching of the impedance of the aerial to a connecting cable. |
