一种基于圆环凹槽型缺陷接地结构的小型化微带天线

his paper presents a method of achieving the miniaturization of microstrip antenna using annular concave shape Defected Ground Structure (DGS).Firstly, the equivalent dielectric constant and the equivalent permeability are extracted from the S-parameters, and the negative dielectric constant and negative magnetic permeability of the DGS structure are verified.Then, the proposed tri-band antenna is a rectangle radiation patch with four slots and DSG, under the same parameters condition, the simulation results show that the resonant frequency of the antenna is reduced significantly incorporated with the DGS compared with conventional patch antenna，the minimum resonant frequency is 1.01GHz and the relative bandwidth is 3.84%. The performance of the antenna in terms of return loss is also improved, the radiation ability is enhanced. The radiation pattern satisfies the radiation pattern of the monopole antenna, and the E-plane pattern is similar to the "8" shape, and the H-plane pattern tends to the omnidirectional pattern.The simulated and measured results agree very well.