A Sector Ring Shape UWB Antenna by Tightly Coupling

Abstract

In this paper, a sector ring shape UWB microstrip antenna based on the tight coupling is proposed. The continuous current and electric field distribution are formed by the coupling effect between microstrip patches. This design expanded the bandwidth of this antenna and realized a high-gain performance. To achieve the miniaturization design, the ring microstrip patches are staggered and the ground is removed to effectively reduce the size of the antenna. The ring shaped antenna has a 31 mm outside diameter and a 21 mm inside diameter, with a 2 mm thick substrate. Besides the excellent mechanical features, such as being compact and easy to fabricate, the proposed antenna also shows good characteristics in radiation patterns and time-domain behaviors. The results show that the antenna achieves the effect of S11 less than -10 dB in the working frequency band of 2 GHz to 8 GHz, and the simulated results are in good agreement with the measured ones. The antenna realizes low profile and broadband in a novel approach, and this antenna can be used in V2X vehicle systems and IoT networks.