Dual-frequency Hexagonal Helical Microstrip Slot Antenna Loaded with Resonant Ring

Abstract

A hexagonal helical microstrip slot dual-frequency antenna loaded with resonant ring is presented in this letter. By loading the resonant ring and slot, the dual frequency of the antenna is realized and the antenna gain is improved. The best performance of the antenna is obtained by the optimization experiment. The simulation results show that when the reflection coefficient of the antenna is less than -10dB, the impedance bandwidth is 1.45GHz-1.78GHz and 2.39GHz-2.52GHz, the corresponding relative bandwidths are 20.4% and 5.3% respectively, and the maximum gain is 3.54dB. The antenna has better performance, it can be used in modern communication systems such as global positioning system (GPS), bluetooth, wireless local area network (WLAN) and WIFI.