An UWB printed log-periodic array antenna

Abstract

A 45deg oblique polarized 3:1 bandwidth ±30deg scan antenna array is designed. The antenna is the printed log-periodic antenna made by dielectric substrate, and feed by a semirigid coaxial line. It has some advantages such as little weight, easy manufacture, high accuracy and consistency. Some antenna cells are made and measured. Accord to the VSWR measured results, some research and improvement is done with the antenna. After be measured, the VSWRs of the antenna at 3:1 bandwidth with ±30° scan angle are blew 2.5. The lobe diagrams of the antenna shows the antenna array can achieve ±30° scan at horizontal direction.