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设计了一款小型超宽带(UWB)共面波导(CPW)馈电的八边形缝隙柔性天线,可应用于超宽带无线通信系统。该天线采用了新兴柔性材料聚二甲基硅氧烷(PDMS)作为介质基板,并在PDMS介质基板的一侧单面覆铜,设计了八边形辐射单元结构和具有八边形缝隙的金属地。为降低工艺难度、简化工艺流程,采用了共面波导进行馈电,并设计了具有阻抗线性渐变功能的梯形结构的信号导带。利用电磁仿真软件对天线进行仿真优化,基于微电子机械系统(MEMS)工艺对天线进行加工制作,并进行了测试。结果表明,所设计的天线带宽达到了11.40 GHz(3.10~14.50 GHz),阻抗相对带宽约为130%,频带内电压驻波比小于2,阻抗匹配良好。测试结果与仿真结果基本一致,天线实现了超宽带工作性能。
A compact ultra-wide band (UWB) coplanar waveguide (CPW) fed octagonal slotted flexible antenna is designed for UWB wireless communication systems. The antenna uses a new and flexible material, polydimethylsiloxane (PDMS) as a dielectric substrate, and one side of the PDMS dielectric substrate is covered with copper to design an octagonal radiating element structure and a metal with an octagonal gap Ground In order to reduce the difficulty of the process and simplify the process flow, a coplanar waveguide is used for feeding, and a ladder-shaped signal conducting belt with an impedance linear grading function is designed. The electromagnetic simulation software is used to simulate and optimize the antenna, and the antenna is fabricated and tested based on the microelectromechanical system (MEMS) technology. The results show that the designed antenna bandwidth reaches 11.40 GHz (3.10 ~ 14.50 GHz), the relative bandwidth of impedance is about 130%, the voltage standing wave ratio in the frequency band is less than 2, and the impedance matching is good. Test results and simulation results are basically the same antenna to achieve ultra-broadband performance.