Circuit modeling of the transmissivity of stacked two-dimensional metallic meshes
ABSTRACT This paper presents a simple analytical circuit-like model to study the transmission of electromagnetic waves through stacked two-dimensional (2-D) conducting meshes. When possible the application of this methodology is very convenient since it provides a straightforward rationale to understand the physical mechanisms behind measured and computed transmission spectra of complex geometries. Also, the disposal of closed-form expressions for the circuit parameters makes the computation effort required by this approach almost negligible. The model is tested by proper comparison with previously obtained numerical and experimental results. The experimental results are explained in terms of the behavior of a finite number of strongly coupled Fabry-Pérot resonators. The number of transmission peaks within a transmission band is equal to the number of resonators. The approximate resonance frequencies of the first and last transmission peaks are obtained from the analysis of an infinite structure of periodically stacked resonators, along with the analytical expressions for the lower and upper limits of the pass-band based on the circuit model.
Full-textDOI: · Available from: Chandra Sekhar Kaipa, Jul 04, 2015
- SourceAvailable from: Alexander B. Yakovlev[Show abstract] [Hide abstract]
ABSTRACT: We report on the dual nature (capacitive and inductive) of the surface impedance of periodic graphene patches at low-terahertz frequencies. The transmission spectra of a graphene-dielectric stack shows that patterned graphene exhibits both the low-frequency (capacitive) passband of metal patch arrays and the higher-frequency (inductive) passband of metal aperture arrays in a single tunable configuration. The analysis is carried out using a transfer matrix approach with two-sided impedance boundary conditions, and the results are verified using full-wave numerical simulations.2013 IEEE AP-S International Symposium on Antennas and Propagation and USNC/URSI Radio Science Meeting, Lake Buena Vista, Florida; 07/2013
Conference Paper: Low-Terahertz Transmissivity with a Graphene-Dielectric Micro-Structure[Show abstract] [Hide abstract]
ABSTRACT: In this paper, we report on the analysis of transmissivity of electromagnetic waves through a stack of dielectric slabs loaded with atomically thin graphene sheets at low-terahertz frequencies. It is observed that the structure supports a series of bandpass regions separated by bandgap regions, similar to the case of stacked metallic meshes separated by dielectric slabs at microwave/THz frequencies or metal-dielectric stack at optical frequencies. The transmission resonances in the bandpass region are identified as coupled Fabry-Pérot resonances associated with the individual dielectric slabs loaded with graphene sheets. The study is carried out using a simple circuit theory model, with the results verified against the numerical simulations.IEEE International Microwave Symposium (IMS) MTT-S, Montreal, Canada; 06/2012
- IEEE AP-S Symposium and USNC/URSI National Radio Science Meeting; 01/2011