Compact printed log periodic dipole antenna with second order semi-circle iteration

In this study, a size-reduced Log Periodic Dipole Antenna (LPDA) with second order semi-circle iteration is presented. Second order semi-circles are added to the dipole arms, which results in lateral size reduction of 23% and 8% with respect to standard LPDA and LPDA with first order semi-circle iteration, respectively. Measurement and simulation results demonstrate that the antenna has a wide range of operating frequency from 0.87 GHz to 2.55 GHz, and shows better gain variation than reference LPDAs.