Performance analysis of dynamically controllable terahertz grounded coplanar waveguide attenuator based on graphene using wave concept iterative process method

Abstract

In this paper, an efficient wave concept iterative process algorithm is proposed to analyze a dynamically controllable grounded coplanar waveguide attenuator based on graphene at terahertz frequencies. The proposed modeling technique of graphene is based on waves concept, that is based on redefining the boundary conditions (surface current and electric field) in terms of incident and reflected waves. The developed algorithm integrates both the interband and intraband conductivities without involving volumetric discretization. Therefore, it consumes less simulation time and computational resources. Numerical studies are conducted to validate the accuracy, speed, and usefulness of the proposed technique. Simulation results demonstrate that the interband term of the graphene conductivity has a significant effect and cannot be neglected in the simulation. The performance of the attenuator can be improved by controlling the chemical potential of graphene, which can achieve an attenuation range from 0.29 to 13.2 dB.

Design and analysis of variable attenuator with simultaneous minimized flat amplitude error and insertion phase variations

“…To address issue, the designer should choose a F I G U R E 1 General structure of reflection-type attenuator with reflection load (Γ L ) wideband hybrid coupler with minimum magnitude and phase imbalance between through and coupled port and a high return loss of more than 20 dB over a wide operating band. Assuming an ideal hybrid coupler, the Sparameter of the reflection-type attenuator can be simplified as (2).…”

“…Variable attenuators, which primary function is to provide amplitude control for various applications, are key components in wireless communication, radar, and measurement systems. [1][2][3] Variable attenuators are widely used for selfinterference cancelation in in-band full-duplex, amplitude weighting in T/R modules of wideband phased array antennas, and beamforming systems. [4][5][6][7][8][9] The variable attenuators are also used in measurement systems for gain control.…”

Numerical investigation of a new sensor for blood glucose detection using an improved wave concept iterative process method

“…Recently, a new method for biological samples modeling based on the wave concept iterative process (WCIP) was presented in Reference 12 for breast tumor detection. This technique has shown a strong capacity of the modeling of innovative materials like Graphene 13 and it is based on the solving of the Maxwell's equations in the spatial‐frequency domain.…”