期刊名称：International Journal of Antennas and Propagation
印刷版ISSN：1687-5869
电子版ISSN：1687-5877
出版年度：2012
卷号：2012
DOI：10.1155/2012/515167
出版社：Hindawi Publishing Corporation
摘要：Novel single
negative metamaterial (MTM) transmission lines
(TLs) are presented and studied in microstrip
technology. They consist of a host TL in the
conductor strip and a fractal-shaped
complementary ring resonator (CRR) etched in the
ground plane. Two types of fractal-shaped CRR
are involved including the Moore and Hilbert. It
is found that fractal perturbation in CRR
results in lower and more transmission zeros in
comparison with conventional CRR using
nonfractal geometries. The single
negative-permeability or -permittivity of these
MTM TLs which associated with the resultant
multitransmission zeros occurs by turns and
should benefit devices with high selectivity
requirement. Potential application of these MTM
cells are illustrated by two examples, one is
the microstrip stepped-impedance transformers
(SIT) operating at 3.5 GHz with two edged
attenuation poles to introduce selectivity; the
other one is the Hi-Lo microstrip low-pass
filter (LPF) with cutoff frequency
2.5 GHz exhibiting improved selectivity
(77.3 dB/GHz). By constructing the low-impedance sections as hybrid prefractal shape
and crown square, both the SITs and LPF obtained
additional bandwidth enhancement and good
matching. Consistent results between simulation
and measurement have confirmed the design
concept.
