Effective Electromagnetic Parameters of Metamaterial Transmission Line Loaded With Asymmetric Unit Cells
| Autor: | Vojislav Milosevic, Radovan Bojanic, Branka Jokanovic |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Physics
Permittivity Radiation business.industry media_common.quotation_subject Mathematical analysis Physics::Optics Metamaterial 020206 networking & telecommunications 02 engineering and technology Condensed Matter Physics 01 natural sciences Asymmetry Reflectivity Characteristic impedance Optics Transmission line 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Reflection (physics) Electrical and Electronic Engineering 010306 general physics business media_common |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 61:2761-2772 |
| ISSN: | 1557-9670 0018-9480 |
| DOI: | 10.1109/tmtt.2013.2268056 |
| Popis: | In this paper, we propose the generalized extraction procedure for retrieval of the effective constitutive parameters for a metamaterial transmission line loaded with asymmetric unit cells. The asymmetric unit cell is replaced with a transmission line immersed in equivalent bianisotropic medium described by effective parameters e, μ, and Zc, and bianisotropic parameters u and η. The proposed retrieval procedure is applied to novel dual-band unit cells and compared with the standard Nicolson-Ross-Weir (NRW) method that is originally developed for the symmetric unit cell and then extended to the asymmetric one using the averaged value of reflection coefficients. It has been shown that, in case of pronounced asymmetry, the NRW method gives only the exact value of refraction, but effective permittivity and permeability are considerably different from the exact values since they are calculated by means of the approximate value of characteristic impedance. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|