On the miniaturization of printed log periodic antenna using T-shaped dipoles

In this paper a compact printed log-periodic dipole antenna (PLPDA) with T-shaped dipoles is presented. Dipoles are bent to increase the electrical size of the dipoles while still maintaining the physical length. The antenna’s radiation resistance and radiation efficiency is improved. The antenna has an operational bandwidth from 0.85 to 6.5 GHz. When T-shaped dipoles are used, the dimension of the PLPDA is reduced by 56%. Impact of miniaturization on the antenna performance is studied through simulations. When T-shaped dipoles are used, the VSWR bandwidth increased by 22.1%, compared to conventional PLPDA.