Abstract: The effects of wire density and width of wire grating antenna on the radiation characteristics of horizontally polarized radiated-wave antenna with biconical-wire grating structure are studied through electromagnetic simulation. The 3D electromagnetic simulation software is applied to build a model of biconical-wire grating antenna. In the cases of the same parameters of pulse source and excitation, the wire number of each wire plate is set to 24, 48, 96 and 192 to study the operational principle of wire plate antenna with different densities. The radius of wire is varied from 1 mm to 40 mm to analyze its effect on the radiation field. The experimental area of the simulator is estimated. It shows that the measuring points right below the bicone center are basically unaffected by wire density and width, while at other measuring points, the wire density has an effect on the leading edge and peak value of the polarization component. Generally, larger wire density will cause smaller leading edge and peak value. When the wire number is increased from 24 to 192, the peak value and leading edge changes about 5% and 10%, respectively. But the changing rate of peak value gradually decreases with the increase in wire number. When wire number exceeds 96, the peak value is basically unchanged. The influence of wire width on radiation field can be ignored. Experimental result shows that the simulator experimental area at 4 m above the ground is a rectangle with the size of 12 m×16 m.

Key words: electromagneticpulsesimulator, horizontallypolarizedradiation-wave, wiregrating, biconicalantenna