Linear antenna array having an omnidirectional characteristic

摘要

The omnidirectional aerial for frequencies in the UHF band is constructed from dipole groups arranged in vertical levels. The radiating elements, and preferably the supply line network as well, are coated onto one or both sides of a flexible plastic film (7). The film is wound in layers around the metallic supporting tube (1) of the antenna such that every winding layer (8, 9, 10, 18), which comprises 360 DEG , is preferably fitted with one electrical functional group of the antenna structure. Cylindrical spacer shells (3, 4, 5, 17) made of dielectric material having a low epsilon r are inserted between the individual winding layers of the conductor film (7) for spacing. The invention reduces the material, the parts and technological outlay for fixed-position transmitting and receiving antennas, for example for mobile cellular radio networks - and, above all, the mass as well - and enables greater variability and cost-effective further optimisation of the RF parameters. <IMAGE>