Experimental Investigation of Radiation Properties of Waveguides Filled with Uniaxial Single Negative Metamaterials (CROSBI ID 510625)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Hrabar, Silvio ; Jankovic, Gordan
engleski
Experimental Investigation of Radiation Properties of Waveguides Filled with Uniaxial Single Negative Metamaterials
Basic radiation properties of a rectangular waveguide filled with anisotropic, either mu-negative (MNG) filling or epsilon-negative (ENG) filling are investigated experimentally. Two antennas based on waveguides filled with double-ring resonators (an MNG filling) and thin wires (an ENG filling) were designed, manufactured and measured in 8 GHz band. It was found that although these waveguides may in principle operate at frequencies arbitrarily lower than cut-off frequency they do radiate into free space. However, the radiation pattern and directivity are similar to those of equivalent apertures with uniform current distribution. Thus, the anisotropic single– negative (SNG) metamaterial filling cannot beat out the fundamental relations between antenna size and directivity. The resonant MNG filling offers narrowband operation and high degree of miniaturization, but (at the present state of the art ) inherent losses cause poor gain (lower than 0 dB). On contrary, the non-resonant wire-based ENG filling offers low loss and broad bandwidth, but technological constraints limit lowest operating frequency (i.e. a degree of miniaturization).
backward wave; waveguide; metamaterial; anisotropy
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Podaci o prilogu
329-332.
2005.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of the 18th International Conference on Applied Electromagnetics and Communications
Bonefačić, Davor
Zagreb: Institute of Electrical and Electronics Engineers (IEEE)
Podaci o skupu
18th International Conference on Applied Electromagnetics and Communications
pozvano predavanje
12.10.2005-14.10.2005
Dubrovnik, Hrvatska