Title:
An approach for small omnidirectional microstrip antennas based on the backward waves of double negative metamaterials
Author(s):
M.F. Wu, F.Y. Meng, Q.Wu, J.Wu, J.C. Lee
Source:
Applied Physics A
Vol./Issue/Date:
87, 2007
Year:
2006
Page(s):
193–198
Keywords:
Abstract:
In this paper, a small omnidirectional microstrip
antenna (MSA) is proposed based on a compact double negative
(DNG) metamaterial, which is constructed bymodified split
ring resonators (MSRRs) and metal strips. First, the backward
wave property of the DNG slab is investigated and illustrated by
full-wave simulations. It is shown that the slab can exhibit double
negative parameters and support backward wave in a broadband
of 8.45 GHz ~ 11.05 GHz, so the existence of the DNG
band is proven. Then the DNG unit cells are stacked and embedded
into a host substrate to construct a phase-compensating
substrate for the small MSA. By using the modified transmission
line model (MTLM) and 3D full-wave simulation, a small
MSA is modeled and characterized. Results show that the presence
of the DNG fillings can indeed greatly reduce the physical
dimensions from 0.5? to 0.17?, while its farfield pattern is
significantly different from that of a conventional half-wavelength
MSA. Lastly, the E-field distributions of the small MSA
and a conventional half-wave-length MSA are contrasted and
discussed to explain the functional mechanism of the small
omnidirectional SMA.
Document:
Reference Id:
327
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