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Effect of defect on the energy distribution inside the left-handed metamaterials

Progress in Natural Science:Materials International 2006年第11期16卷 1227-1230页

作者： LUO Chunrong, JIE Xiaoyong, ZHAO Qian and ZHAO Xiaopeng** (Institute of Electrorheological Technology, Northwestern Polytechnical University, Xi’an 710072, China) Institute of Electrorheological Technology Northwestern Polytechnical University Xi'an 710072 China

The electromagnetic field energy distribution inside the left-handed metamaterials (LHMs) with or without blank and line defects is firstly investigated. The LHMs consist of an array of periodic unit cells of copper hexagon split ring resonators (SRRs) and wires. The internal energy distribution of the LHMs is measured in a microwave measuring line device at X-band frequencies. It is found that the LHMs only respond to the electromagnetic field around the resonance frequency. The electromagnetic field amplitude inside the LHMs generally decreases with the introduction of defects. It is suggested that the electromagnetic field energy reduction may arise from the symmetry breaking in the LHMs.

关键词： left-handed metamaterials electromagnetic field energy distribution defect.

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metamaterials and metasurfaces for designing metadevices:Perfect absorbers and microstrip patch antennas

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Chinese Physics B 2018年第11期27卷 235-249页

作者： Yahong Liu Xiaopeng Zhao Smart Materials Laboratory Department of Applied Physics Northwestern Polytechnical University Xi＇an 710129 China

In the past twenty years, electromagnetic metamaterials represented by left-handed metamaterials（LHMs） have attracted considerable attention due to the unique properties such as negative refraction, perfect lens, and electromagnetic cloaks. In this paper, we present a comprehensive review of our group＇s work on metamaterials and metasurfaces. We present several types of LHMs and chiral metamaterials. As a two-dimensional equivalent of bulk three-dimensional metamaterials, metasurfaces have led to a myriad of devices due to the advantages of lower profile, lower losses, and simpler to fabricate than bulk three-dimensional metamaterials. We demonstrate the novel microwave metadevices based on metamaterials and metasurfaces： perfect absorbers and microwave patch antennas, including novel transmission line antennas,high gain resonant cavity antennas, wide scanning phased array antennas, and circularly polarized antennas.

关键词： left-handed metamaterials chiral metamaterials metasurfaces perfect absorbers microstrip patch antennas

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Tunable left-handed metamaterial based on electrorheological fluids

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Progress in Natural Science:Materials International 2008年第7期18卷 907-911页

作者： Yong Huang, Xiaopeng Zhao *, Liansheng Wang, Chunrong Luo Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China Institute of Electrorheological Technology Department of Applied Physics Northwestern Polytechnical University Xi’an 710072 China

A tunable left-handed metamaterial consisting of a periodic array of the left-handed dendritic structure units infiltrated with electro- rheological fluids is demonstrated. Experimental results show that the passband can move from the original 8.50–10.60 GHz to 7.16– 8.39 GHz after electrorheological fluids are infused. When a dc (direct current) electric field of 666 V/mm is applied, the passband moves toward lower frequency of within 7.08–8.30 GHz. This method provides one convenient way to design adaptive metamaterials.

关键词： left-handed metamaterials Dendritic model Electrorheological fluids Omnidirection

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