Inhomogeneous Dielectric Media: Wave Propagation and Dielectric Permittivity Reconstruction in the Case of a Rectangular Waveguide

2002 ◽  
Vol 16 (10) ◽  
pp. 1371-1392 ◽  
Author(s):  
K. Baganas
Keyword(s):  
Wave Propagation ◽  
Dielectric Permittivity ◽  
Rectangular Waveguide ◽  
Dielectric Media ◽  
Inhomogeneous Dielectric

scholarly journals Energy tunneling through narrow waveguide channel and design of small antennas

2011 ◽  
Vol 8 (1) ◽  
pp. 63-71
Author(s):  
Miranda Mitrovic ◽  
Branka Jokanovic
Keyword(s):  
Wave Propagation ◽  
Dielectric Permittivity ◽  
Transmission Coefficient ◽  
Rectangular Waveguide ◽  
Narrow Channel ◽  
Waveguide Channel ◽  
Small Antennas ◽  
Field Density ◽  
Effective Dielectric Permittivity ◽  
Small Antenna

In this paper we investigate the conditions for energy tunneling through narrow channel obtained by reducing the height of rectangular waveguide. Tunneling of the energy occurs at the frequency for which the effective dielectric permittivity of the channel becomes equal to zero, so it can be treated as an ENZ (epsilon-near-zero) metamaterial. We investigated how geometry of the channel and dielectric permittivity affect the transmission coefficient and field density in the channel. Adding slots in the channel, which are placed orthogonally to the wave propagation, we designed a small antenna with directivity of 5.44 dBi at the frequency of 3 GHz.

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