Abstract
To investigate the frequency shift phenomenon by inserting graphene, a generalized lossy transmission-line model and the related electrical parameter-extraction theory are proposed in this paper. Three kinds of graphene-based transmission lines with attenuation phenomenon including microstrip line, double-side parallel strip line, and uniplanar coplanar waveguide are analyzed under the common conditions where different chemical potentials are loaded on graphene. The values of attenuation constant and phase constant, and the real and imaginary parts of the characteristic impedance of transmission lines are extracted to analyze in details. When the attenuation constant and the reactance part of the characteristic impedance are approximately equal to zero, this kind of transmission line has low or zero insertion loss. On the contrary, the transmission line is under the radiation mode with obvious insertion loss. The phase constant changes linearly under the transmission mode and can be varied with changing of chemical potentials which attributes to the property of frequency tunability. Furthermore, a bandwidth reconfigurable uniplanar coplanar waveguide power divider is simulated to demonstrate that this theory can be applied to the design of three-port devices. In summary, this work provides a strong potential approach and design theory to help design other kinds of terahertz and mid-infrared reconfigurable devices.
Highlights
To investigate the frequency shift phenomenon by inserting graphene, a generalized lossy transmission-line model and the related electrical parameter-extraction theory are proposed in this paper
The frequency reconfigurable graphene-metal transmission line based on lossy transmission-line model and electrical parameter-extraction (T-LMEP-E) theory is proposed in this paper
The values of attenuation constant and phase constant, and the real and imaginary parts of the complex the characteristic impedance are extracted to analyze in details, respectively
Summary
To investigate the frequency shift phenomenon by inserting graphene, a generalized lossy transmission-line model and the related electrical parameter-extraction theory are proposed in this paper. Three kinds of graphene-based transmission lines with attenuation phenomenon including microstrip line, double-side parallel strip line, and uniplanar coplanar waveguide are analyzed under the common conditions where different chemical potentials are loaded on graphene. The calculated results based on the proposed T-LMEP-E theory show that the introduction of graphene in transmission line greatly affects the phase constant modeled as a function of frequency. In order to verify the application of the proposed T-LMEP-E theory on the three-port devices, a bandwidth reconfigurable uniplanar coplanar waveguide power divider is simulated. These results show that the proposed T-LMEP-E theory would provide an effective and clear design guide for reconfigurable terahertz and mid-infrared graphene-based devices
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