理学院数理讲坛（第二十三讲）

报告题目：Compact circuit modeling of RF characteristics of 1-D nanostructures

报告人：Prof.Cary Y. Yang (Santa Clara University)

报告时间：2011年11月2日（周三）10:00-11:00

报告地点：龙赛理科楼北楼311

A method to extract compact circuit models for one-dimensional nanostructures from measured high-frequency characteristics is described. We demonstrate that a frequency-independent parallel RC circuit is the simplest model that accurately describes high-frequency electrical conduction in carbon nanofibers. The resistance is determined from dc measurement and the capacitance is extracted directly from measured S-parameters for a ground-signal-ground test structure, without using any fitting parameter.  The results obtained from the circuit model for carbon nanofibers are within ± 0.5 dB and ± 5° of measured S-parameters up to 50 GHz.  The model is further justified by examining the relationship between S and Y-parameters of the test network.