Study of a Circular Disc Monopole Ultrawide-band Miniature Antenna

Abstract— Study of a novel planar circular disc monopole ultrawide-band antenna fed by coaxial line is presented in this paper. The radiator, ground plane and the feeder equipment of the antenna are placed on the same plate. The special structure reduces the spatial volume, and it is used to realize the miniaturization of the antenna. The basic theory and design method are analyzed, and detailed exploration is conducted to determine the antenna’s properties. The current distributions, return loss, radiation patterns and gain of the antenna are discussed. In addition, the time domain performance of the proposed antenna is also evaluated in simulations. The research results show that this kind of planar antenna can radiate and receive short pulse signals without distortion. The 10 dB return loss bandwidth is from 2.5GHz to 55 GHz. And it can realize near omnidirectional pattern in the H-plane. It is a real planar structure and can really reduce the spatial volume. On this basis, the structure of the planar circular disc monopole antenna is improved. The radiator moves around the upper edge of the ground plane. The new structure reduces the antenna height to a certain degree and it is used to achieve further miniaturization. Analyses are conducted to determine the novel antennas’ properties. The result of study indicates that the improved antenna can realize good bandwidth performance as the planar circular disc monopole antenna, and it has low-cost, simple structural characteristics. The novel miniature antenna and the improved type are suitable for the wireless communications, satellite communications and mobile communications systems with good prospects.