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Bandwidth enhancing method using tri-ring resonator metamaterial for small devices
摘要： Metamaterials are composite structures of the specific behavior for electromagnetic properties of permittivity, permeability, and refraction, which are not commonly found in regular materials. Metamaterial structure, which has negative value of permittivity and permeability that shows passband response in transmission line, where as if any of these two properties has opposite polarity then it shows stopband response. These behaviors of metamaterial are frequency dependent and have resonance for particular frequencies. At frequency resonance, the traditional metamaterials have narrow band response and to improve its frequency bandwidth, a method using tri-ring resonator is proposed with increasing number of order of resonator. The proposed metamaterial structure is simulated in full-wave simulator and MATLAB tool is used to analyze the properties of metamaterial structure from simulated S-parameter. Proposed technique gives flexibility to use the design for multiple application like, rejection filter for Bluetooth 2.4 GHz, Wi-Fi (2.4 and 5 GHz), WiMAX (2.5 and 3.4 GHz), and 5G (3.4-3.8 GHz).
关键词： SRR,band rejection,split ring resonator,metamaterial,broadband
更新于2025-09-23 15:23:52
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A PENTA-BAND REJECT INSIDE CUT KOCH FRACTAL HEXAGONAL MONOPOLE UWB MIMO ANTENNA FOR PORTABLE DEVICES
摘要： In this paper, a novel compact hexagonal shaped ultra-wideband multiple-input multiple-output (UWB-MIMO) Koch fractal antenna is designed with penta-band rejection characteristics for portable devices. The antenna rejects the C-band downlink frequency from 3.7–4 GHz, the C-band uplink frequency from 5.75–6.05 GHz and the satellite bands from 7.45 to 8.4 GHz. The band 7.45–7.55 GHz is used by the meteorological satellite service for the geostationary satellite services. The band 7.75–7.9 GHz is used by the meteorological satellite service for non-geostationary satellite services. The band 8.025–8.4 GHz is used by the Earth exploration satellites for geostationary satellite services. The C-band and satellite bands interfere with the UWB and have been rejected using a band reject ?lter. A spiral shaped slot is introduced inside the fractal hexagonal monopole to introduce band reject characteristics. The band suppression and widening of the impedance bandwidth are achieved by using defected ground structures. The antenna has wideband impedance matching with S11 < ?10 dB in the UWB frequency range from 3.1 to 13.6 GHz and has a low mutual coupling with S21 < ?19 dB. The antenna has very low envelope correlation coe?cient of less than 0.17 and low capacity loss of 0.254, which proves that the MIMO antenna shows good diversity performance.
关键词： Koch fractal,defected ground structures,UWB-MIMO,spiral slot,penta-band rejection
更新于2025-09-23 15:21:01
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A high‐selectivity dual‐polarization filtering antenna with metamaterial for 5G application
摘要： A high-selectivity dual-polarization filtering antenna with metamaterial is presented in this letter. The multilayer coupled radiation structure of the antenna determines a filtering function. With the metamaterial layer designed above the antenna, a sharp roll-off rate at high pass band edge and a better out-of-band rejection occurs, thus a better high selective filtering characteristic can be achieved. Simulating the impedance bandwidth and measuring the antenna, (VSWR <2) of the antenna is from 3.25 GHz to 3.85 GHz; meanwhile, the maximum gain can reach 9dBi. The gain of antenna can quickly decrease 43dBi at the high pass band edge from 3.85 GHz to 4.05 GHz and the antenna has an out-of-band rejection level of 27dBi from 4.05 GHz to 5 GHz. The tested results verify our designs and the antenna could be a good candidate for the 5G anti-interference wireless terminal communication system.
关键词： high selectivity,metamaterial,filtering antenna,out-of-band rejection,dual polarization
更新于2025-09-04 15:30:14