A novel compact monopole antenna with super wide bandwidth

In this paper, a novel monopole antenna with a compact configuration is proposed, which can operate in the frequency range from 6.8GHz to 37.8GHz. The antenna consists of two main components. One is the two orthogonal half discs with a cavity inside each of them. The other is the circular metallic ground. Firstly, according to the traditonal theory [1], the dimension of each half disc can be determined preliminarily. Then, a cavity is set inside each disc. By using CST simulation software, the opitmal scales of the antenna, at last, can be obtained. From the simulated results, it can be seen that the bandwidth of the antenna is from 6.8GHz to 37.8GHz, meanwhile, the radiation patterns of the antenna stay almost contant over the entire bandwidth. More importantly, there is a dramatic decrease in the dimension of the proposed antenna, compared to the antennas reported in [2]. Hence, the strengths mentioned above contribute to a much wider range of potential application, especially the application in the radio spectrum detection, which demands the bandwidth of antennas to be as wide as possible.