An optimum design of low-profile ultra-wideband HF skeletal wire duoconical monopole antenna with parasitic grounded poles

This paper presents a low profile ultra-wideband HF skeletal wire duoconical monopole antenna with parasitic grounded poles, which is then optimally designed using an efficient tool called charge and current marching-on-in-time (CCMOT) algorithm for analyzing thin-wire antennas together with the genetic algorithm (GA). As a result, an ultra-wideband HF antenna working between 7.5MHz and 25MHz is obtained, which is only less than one-fifth maximum wavelength high and composed of five wires and five grounded poles. Its VSWR in the whole frequency band is no more than 2.5 and the computed gain is above 0dBi when erected on a real ground through a metal grid ground screen. The design in the paper is of great significance to the HF communication or multi-band HF surface wave radar.