Research And Design Of The Antenna With Left-hand Metamaterials

It is well known that the Left-handed metamaterials (LHM) have specialelectromagnetic properties, so it has received great attention in recent years. Weinvestigated the present situation of the domestic and foreign scholars study’s ofleft-handed materials, found that the left hand materials also has significant advantages inantenna designs. With the development of modern communication technology, there is anincreasing demand for different applications of antennas, especially miniaturized,multi-band and ultra-wideband antenna. In this paper, we analyze the resonancecharacteristics of the cross structure, SRR structure and deformed structure DSRR whicharound the left-handed materials with ultra wideband characteristics closely. With the helpof simulation software CST Microwave Studio we designed two ultra-wideband antennawith left hand materials.At first, we proposed an ultra-wideband antenna with Jerusalem cross metamaterialstructure. It operates in the frequency range of3-9GHz, we also research the influence ofepsilon of the substrate, the thickness of the substrate, the width of the feedline on theantenna performance with CST Microwave Studio. The result shows that the antenna hasthe bandwidth of1.84GHz with a notched band of5.15-5.825GHz which covers theworking band of the WLAN.Besides that, we present a novel tri-band antenna with deformed split ring resonator(DSRR) based on the excellent properties of SRR. The proposed antenna operates in thefrequency range of2.5~9.5GHz, we also investigate the influence of the capacitance andinductance on the antenna performance. The result shows that the proposed antenna hasthe bandwidth of1.05GHz (2.87GHz~33.92GHz),1.22GHz (5.08~6.30GHz),1.77GHz(7.55~9.32GHz) which cover the working band of WLAN (5.15~5.825GHz) and theworking band of WIMAX (3.3~3.8GHz). In addition it also can be applied in the X-band.The radiation pattern is omnidirectional and the direction gain at every frequency is above3.2dBi.