一种新型宽带电阻膜吸波体设计

Design of novel broadband absorber based on resistive film

摘要:
目的为了改善传统电磁吸波材料的吸波特性，基于阻抗匹配理论设计一种具有高吸收率的电阻膜吸波体。
方法吸波体采用周期排布的电阻膜图案−介质基板−导体接地板结构，其电阻膜单元由耶路撒冷十字单元与外围的方环单元组合而成。
结果仿真结果表明，所设计的吸波体在2.9~5.1 GHz的频率范围内对电磁波的吸收率超过90%，峰值吸收率可达99.4%，且具有宽角度吸收与极化不敏感特性。
结论所设计的吸波体对于人工电磁周期吸波体的宽带吸波体设计具有一定参考价值。

Abstract:
Objectives In order to improve the performance of traditional absorbing materials, a high-absorptivity broadband absorber is designed.
Methods The absorber consists of a resistive film, dielectric substrate and metal ground plate. The element unit of the resistive film is composed of a Jerusalem cross unit and outer square loop.
Results The simulated results indicate that the absorption of the designed absorber is more than 90% in the frequency range of 2.9–5.1 GHz, and an absorptivity peak of 99.4% can be achieved. Absorption performance can also be maintained in wide-angle cases and polarization-insensitive cases.
Conclusions The absorber proposed in this paper has significance for the design and application of broadband absorbers.