Design of miniaturized log-periodic high frequency antenna

Based on the miniaturization of high frequency (HF) antenna, a miniaturized rotated log-periodic HF antenna is designed by analyzing the theory of the cable of coattails log-periodic antenna. Limited in small structure, it is combined inductance loaded and L structure loaded so that the lowest work frequency of rotated log-periodic antenna is effectively extended. The designed antenna can work in 3～30 MHz, however, its length is only 25 m. Simulation and test results show that the voltage standing wave ratio(VSWR) of the antenna is less than 2.5, the typical gain is 8 dBi, the new designed antenna can be used in communication in 2 000 km.