A broadband negative refractive index metamaterial based on a windmill-like structure is proposed, and investigated numerically and experimentally at the microwave frequency range. From the numerical and experimental ...A broadband negative refractive index metamaterial based on a windmill-like structure is proposed, and investigated numerically and experimentally at the microwave frequency range. From the numerical and experimental results, effect media parameters are retrieved, which clearly show that two broad frequency bands exist in which the permittivity and permeability are negative. The two negative bands are from 9.1 GHz to 10.5 GHz and from 12.05 GHz to 14.65 GHz respectively, and the negative bandwidth is 4 GHz. Due to the good bandwidth performance, the metallic cell with double negative property obtained in this paper is suitable for use in the design of multiband or broadband microwave devices.展开更多
A dual band planar antenna based on metamaterial transmission lines is presented for WLAN,WiMAX,and satellite system communication applications.This antenna is composed of an interdigital capacitor and a ground plane ...A dual band planar antenna based on metamaterial transmission lines is presented for WLAN,WiMAX,and satellite system communication applications.This antenna is composed of an interdigital capacitor and a ground plane with triangular shaped slots on its top edges to broaden the impedance bandwidth.The measured bandwidth for 10 dB return loss is from 3.29 to 4.27 GHz and 5.04 to 9.8 GHz,covering the 5.2/5.8 GHz WLAN,3.5/5.5 GHz WiMAX bands,and the X-band satellite communication systems at 7.4 GHz.The proposed antenna exhibits stable monopole-like radiation patterns and enough gains across the dual operating bands.展开更多
A low absorptivity broadband negative refractive index metamaterial with a multi-gap split-ring and metallic cross （MSMC） structure is proposed and investigated numerically and experimentally in the microwave freque...A low absorptivity broadband negative refractive index metamaterial with a multi-gap split-ring and metallic cross （MSMC） structure is proposed and investigated numerically and experimentally in the microwave frequency range. The effective media parameters were retrieved from the numerical and experimental results, which clearly show that there exists a very wide frequency band where the permittivity and permeability are negative. The influence of the structure parameters on the magnetic response and the cut-off frequency of the negative permittivity are studied in detail. This metamaterial would have potential application in designing broadband microwave devices.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61172115 and 60872029)the National High-Technology Research and Development Program of China (Grant No. 2008AA01Z206)+1 种基金the Aeronautics Foundation of China (Grant No. 20100180003)the Fundamental Research Funds for the Central Universities, China (Grant No. ZYGX 2009J037)
文摘A broadband negative refractive index metamaterial based on a windmill-like structure is proposed, and investigated numerically and experimentally at the microwave frequency range. From the numerical and experimental results, effect media parameters are retrieved, which clearly show that two broad frequency bands exist in which the permittivity and permeability are negative. The two negative bands are from 9.1 GHz to 10.5 GHz and from 12.05 GHz to 14.65 GHz respectively, and the negative bandwidth is 4 GHz. Due to the good bandwidth performance, the metallic cell with double negative property obtained in this paper is suitable for use in the design of multiband or broadband microwave devices.
基金Supported by the National Natural Science Foundation of China under Grant Nos 61172115,60872029.
文摘A dual band planar antenna based on metamaterial transmission lines is presented for WLAN,WiMAX,and satellite system communication applications.This antenna is composed of an interdigital capacitor and a ground plane with triangular shaped slots on its top edges to broaden the impedance bandwidth.The measured bandwidth for 10 dB return loss is from 3.29 to 4.27 GHz and 5.04 to 9.8 GHz,covering the 5.2/5.8 GHz WLAN,3.5/5.5 GHz WiMAX bands,and the X-band satellite communication systems at 7.4 GHz.The proposed antenna exhibits stable monopole-like radiation patterns and enough gains across the dual operating bands.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61172115 and 60872029)the High-Tech Research and Development Program of China (Grant No. 2008AA01Z206)+1 种基金the Aeronautics Foundation of China (Grant No. 20100180003)the Fundamental Research Funds for the Central Universities of China (Grant No. ZYGX 2009J037)
文摘A low absorptivity broadband negative refractive index metamaterial with a multi-gap split-ring and metallic cross （MSMC） structure is proposed and investigated numerically and experimentally in the microwave frequency range. The effective media parameters were retrieved from the numerical and experimental results, which clearly show that there exists a very wide frequency band where the permittivity and permeability are negative. The influence of the structure parameters on the magnetic response and the cut-off frequency of the negative permittivity are studied in detail. This metamaterial would have potential application in designing broadband microwave devices.
