Compact equivalent-circuit model of LiNbO[sub]3[/sub] modulator for passive millimeter wave imaging system

Autor: Qian, Feng-chen, Xie, Xiao-ping, Ye, Ya-lin
Zdroj: Proceedings of SPIE; June 2011, Vol. 8196 Issue: 1 p81961L-81961L-7, 737657p
Abstrakt: This paper presents a compact frequency-independent equivalent-circuit model for mmW characteristics of lithium niobate (LiNbO3) optical modulator, taking the skin effect, and substrate effect into consideration. Equivalent-circuit model with only ideal lumped elements represents the broadband electrical response of LiNbO3modulator. A 4-long ladder model is used to model the skin effect. Coupling capacitor is used to simulate the substrate coupling from the CPW to the buffer and LiNbO3substrate. Lumped-element circuit model was cascaded to model the distributive skin effect, transmission attenuation, and substrate effect. The equivalent-circuit models are fully SPICE compatible and can be incorporated directly into common circuit simulators and microwave design tools.
Databáze: Supplemental Index