Planar tunable graphene based low-pass filter in the terahertz band
| Autor: | Gholamreza Moradi, Amin Ghahremani |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Frequency response Materials science business.industry Terahertz radiation Low-pass filter 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Optics Band-pass filter Transmission line Filter (video) 0103 physical sciences Equivalent circuit Insertion loss Electrical and Electronic Engineering 0210 nano-technology business Engineering (miscellaneous) |
| Zdroj: | Applied Optics. 57:7823 |
| ISSN: | 2155-3165 1559-128X |
| DOI: | 10.1364/ao.57.007823 |
| Popis: | In this paper, design and analysis of planar graphene-based low-pass filters in the terahertz band are proposed. Using the proposed approach, it is possible to design plasmonic low-pass filters with the desired properties in the form of open stubs. The transfer matrix method is used based on the transmission line model for analyzing filters. The propagation constant and characteristic impedance required for this method are obtained according to the electrostatic scaling law and power-current approach, respectively. A typical fifth-degree low-pass filter is designed and analyzed according to the mentioned process. The frequency response of the low-pass filter indicates insertion loss of less than 2 dB, roll-off rate of 17 dB/THz, return loss higher than 10 dB, and constant group delay of 0.3 ps. The results of the full-wave simulation confirm the analytical ones. Also, the theory of graphene equivalent circuit variation to the different chemical potentials is expressed so the filter frequency response can be explicitly predicted for any bias value. These filters, due to their compact structure and integrated electrical and physical shape, are the suitable choice for use in full-integrated planar circuits of terahertz systems. |
| Databáze: | OpenAIRE |
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