Antenna is an indispensable component of the radio system. Radio system was closely related with human life and production activities. The antenna system transmits the information on the space by electromagnetic wave, and the electromagnetic wave’s transmission and receival must be complete by the antenna. As one type of the most basic and most important antenna, it’s great meaning to studying the dipole’s radiation ability.
This article focuses on directivity function and radiation resistance of dipole antenna. Based on the ideal mathematical model, this article analyses the directivity and radiation resistance of dipole. After drawing 2D pattern under several sorts of dipole length, and radiation resistance graph about ,this article further analyses radiation ability, and obtain more general rule about radiation of dipole antenna.