This paper presents a novel multiple splits octagon-shaped metamaterial which exhibits double left-handed frequency bands roughly from 9.25 GHz to 9.68 GHz and from 15.28 GHz to 15.36 GHz derived from the transmission characteristics by homogenization retrieval method. Two conventional microstrip patch antennas whose resonance frequency bands are located at the first left-handed frequency band and the second one respectively are designed to further investigate the influence by loading the proposed metamaterial as its superstrate. HFSS simulation numerical results indicate that the far field radiation directivity half-power bandwidth(HPBW) of the E-plane and H-plane have reduced by 64%, 63.7% and 59.4%, 59%, and the maximal gain increases from 8.251 dB to 11.024 dB and from 8.5432 dB to 11.9653 dB respectively after loading with the multiple splits octagonal metamaterial superstrate.
LevineE., MalamudG., ShtrikmanandS. and TrevesD., A study of microstrip array antennas with the feed network, Antennas and Propagation, IEEE Transactions on37(4) (1989), 426-434.
2.
BaoS., LuoC.-R. and ZhaoX.-P., S-wave band microstrip antenna with perfect absorbing metamaterial substrate, Acta Phys Sin60 (2011), 014101.
3.
LiuZ., WangP. and ZengZ., Enhancement of the gain for microstrip antennas using negative permeability metamaterial on low temperature co-fired ceramic (LTCC) substrate, Antennas and Wireless Propagation Letters, IEEE12 (2013), 429-432.
4.
MaB. and YangX.-M., Study on Arrow-shaped Metamaterial Design and its Application in Wireless Power Transmission, Journal of Xihua University (Natural Science Edition) 34(5) (2015), 47-50.
5.
DwivediS., MishraV. and KostaY.P., Directivity enhancement of miniaturized microstrip patch antenna using metamaterial cover, International Journal of Applied Electromagnetics and Mechanics47(2) (2015), 399-409.
6.
RavalF., KostaY.P. and JoshiH., Triple-band circular patch antenna using rising sun shaped metamaterial structure, International Journal of Applied Electromagnetics and Mechanics46(3) (2014), 501-509.
7.
YangX., SunD., ZuoT., ChenX. and HuangK., Analysis and realization of improving the patch antenna gain based on metamaterials, International Journal of Applied Electromagnetics and Mechanics44(1) (2014), 17-25.
8.
RavalF., KostaY.P. and JoshiH., Dual-band patch antenna with complementary split ring resonators loaded modified ground plane, International Jsournal of Applied Electromagnetics and Mechanics43(3) (2013), 227-235.
9.
EnochS., TayebG., SabourouxP., GuérinN. and VincentP., A metamaterial for directive emission, Physical Review Letters89(21) (2002), 213902.
10.
YuanY., ShenL., RanL., JiangT., HuangfuJ. and KongJ.A., Directive emission based on anisotropic metamaterials, Physical Review A77(5) (2008), 053821.
11.
BurokurS.N., LatrachM. and ToutainS., Theoretical investigation of a circular patch antenna in the presence of a left-handed medium, Antennas and Wireless Propagation Letters, IEEE4 (2005), 183-186.
12.
ChenH., RanL., HuangfuJ., ZhangX., ChenK., GrzegorczykT.M. and KongJ.A., Metamaterial exhibiting left-handed properties over multiple frequency bands, Journal of Applied Physics96(9) (2004), 5338-5340.
13.
XuH.X., WangG.M., ZhangC.X., LiuQ., XuZ.M., ChenX. and ZhaiD.L., Multi-band left-handed metamaterial inspired by tree-shaped fractal geometry, Photonics and Nanostructures-Fundamentals and Applications11(1) (2013), 15-28.
JahromiA.G., MohajeriF. and FeizN., Miniaturization of a Rectangular Microstrip Patch Antenna Loaded with Metamaterial, Proceedings of World Academy of Science, Engineering and Technology (76) (2013), 186.
16.
LiS., GaoJ., CaoX., LiW., ZhangZ. and ZhangD., Wideband, thin, and polarization-insensitive perfect absorber based the double octagonal rings metamaterialsand lumped resistances, Journal of Applied Physics116(4) (2014), 043710.
17.
YangH., WangC.-H. and GuoX.-R., A novel dual-band left-handed metamaterials composed of multi-defects hexagonal structure, Acta Phys Sin63 (2014), 014103.
18.
SmithD.R., VierD.C., KoschnyT. and SoukoulisC.M., Electromagnetic parameter retrieval from inhomogeneous metamaterials, Physical Review E71(3) (2005), 036617.
19.
PendryJ.B., HoldenA.J., RobbinsD.J. and StewartW.J., Low frequency plasmons in thin-wire structures, Journal of Physics: Condensed Matter10(22) (1998), 4785.
20.
NoghanianS. and ShafaiL., Control of microstrip antenna radiation characteristics by ground plane size and shape, Microwaves, Antennas and Propagation, IEE Proceedings, IET145(3) (1998), 207-212.
21.
BhattacharyyaA.K., Effects of finite ground plane on the radiation characteristics of a circular patch antenna, Antennas and Propagation, IEEE Transactions on38(2) (1990), 152-159.
22.
KishkA.A. and ShafaiL., The effect of various parameters of circular microstrip antennas on their radiation efficiency and the mode excitation, Antennas and Propagation, IEEE Transactions on34(8) (1986), 969-976.
LiuY., GuoX., GuS. and ZhaoX., Zero Index Metamaterial for Designing High-Gain Patch Antenna, International Journal of Antennas and Propagation (2013), Article ID 215681, 2013, 12.
25.
ZiolkowskiR.W. and HeymanE., Wave propagation in media having negative permittivity and permeability, Physical review E64(5) (2001), 056625.
