摘要
本文设计了一种柔性双频段极化无关的频率选择表面膜,应用在玻璃表面形成频率选择性玻璃,用来屏蔽常见的Wi-Fi等在公共且免费使用的微波频段的信号。所设计的结构工作频率分别为2.45GHz和5.5GHz。在工作频点处对电磁波的吸收能达到40dB。能够有效的阻止太空发电站的微波能量传输信号和室内Wi-Fi信号的相互干扰问题。另外,分析了结构的几何参数和入射角度对结构吸波特性的影响,在入射角达到度45°时,仍具有良好的屏蔽效果,说明这种柔性膜可以应用在非平面的场合下。并用等效电路模型对结构进行分析,详细的介绍了等效电路元件参数的计算过程,之后用电子辅助设计软件进行电路仿真,电路仿真的结果和全波电磁仿真软件仿真结果一致。所设计的结构改善了之前频率选择表面一体化设计,透光率差和制造成本高的问题。透光率达到91%。此外所设计的结构是一种具有柔性的模块化薄膜结构,现实中安装实现起来更加的方便。
A flexible,dual-band and polarization-insensitive frequency selective surface(FSS)film is designed,which is applied to the glass surface to form a shielding structure to obstruct the microwave signals such as Wi-Fi in the public and free frequency band.Designed structure resonates at 2.45GHz and 5.5GHz.The absorption of electromagnetic waves at the operating frequency point can reach 40dB.It can effectively prevent the mutual interference between the microwave energy transmission signal of the space power station and the indoor Wi-Fi signal.Besides,the influence of structure's geometric parameters and incident angle on absorption characteristics of the design is analyzed.When the incident angle reaches 45 degrees,it still has a satisfactory shielding effect indicating that this elastic film can be applied in non-planar situations.In order to give an insight into the shielding mechanisms,an equivalent circuit model is used to model the structure,and the calculation process of the equivalent circuit element parameters is introduced in detail.Then,the circuit simulation is performed by using an electronic design automation tool.Circuit simulation results are consistent with the full-wave electromagnetic simulation results.The proposed structure solves the problems of integrated design of frequency selective surface,poor optical transmittance and high manufacturing cost.What's more,the optical transmission rate can reach to 91%and the designed structure is a flexible modular film which is more convenient to implement in reality.
作者
束文生
SHU Wensheng(Beijing Jiaotong University,School of Electronic and Information Engineering,Institute of Electromagnetic Compatibility,Beijing 100044,China)
出处
《空间电子技术》
2020年第2期109-113,共5页
Space Electronic Technology
基金
国家重点研发计划(编号:2017YFB1201104-02)。
