以聚酰亚胺为衬底,设计了一种基于石墨烯的工作在太赫兹波段的频率可重构贴片天线,该天线不需要加载电子开关,通过调节偏置电场,可动态地调控天线的谐振频率点并保持辐射性能不变。研究了石墨烯的主要特性,利用天线的等效电路模型,计算了石墨烯贴片天线的输入阻抗,理论解释了频率可调谐的原因。所设计的石墨烯天线在太赫兹波段有5个谐振频率点,覆盖了678.25~721.75 GHz的频段,辐射增益峰值可达6.92 dB,辐射效率最高可达86.48%。

A frequency-reconfigurable graphene patch antenna working in the terahertz band is designed on a polyimide substrate. The resonance frequency points of this antenna can be tuned dynamically by the bias electrical field rather than any electronic switch, meanwhile its radiation performance is kept. The main characteristics of graphene are studied, the input impedance of the graphene patch antenna is calculated based on the equivalent circuit model, and the reason of frequency-tuning is explained theoretically. The designed graphene antenna achieves five resonance frequency points in the terahertz band, which covers the frequency bands ranging from 678.25 GHz to 721.75 GHz. The radiation gain peak can reach 6.92 dB, and the radiation efficiency can reach 86.48%.