基于结构诱导人工表面等离激元的宽带低耦合电路

Broadband Low-Coupling Circuit Based on Structure-Induced Spoof Surface Plasmon

实现超宽带传输和超高集成度设计是微波和太赫兹电路发展的终极目标。针对以上目标,本文提出了结构诱导人工表面等离激元的概念。基于此设计并验证了具有超高局附性和超小传输常数的结构诱导人工表面等离激元电路结构,打破了传统人工表面等离激元电路对传输常数和衰减常数的限制。理论分析和数值验证表明,相较于经典人工表面等离激元,具备优异的场局附性和传输特性的结构诱导人工表面等离激元具有明显的弱色散和低耦合特性,在电路设计中可以有效减少宽带信号传输的色散失真,同时提高布线密度。

The realization of ultra-wideband transmission and ultra-high integration design are the ultimate goals of the development of microwave and terahertz circuits. Aiming at the above goals, in this paper, the concept of structural-induced spoof surface plasmon is proposed and verified. Based on this, the circuit structure of spoof surface plasmon circuit with ultra-high confinement and ultra-small propagation constant is designed and verified, which breaks the limitation of propagation and decay constants of classical spoof surface plasmon circuit. Theoretical analysis and numerical verification show that compared with the classical spoof surface plasmons, structure-induced spoof surface plasmon with excellent field confinement and transmission properties have obvious characteristics of weak dispersion and low coupling. The circuit design based on structure-induced spoof surface plasmon can effectively reduce the dispersion distortion of broadband signal and improve the circuit density.