共查询到19条相似文献,搜索用时 337 毫秒
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传输线模型是分析微带天线的一种最简单的方法,但其未将导体的特性参数考虑到天线的分析中去,针对这一缺点,为研究超导体的表面阻抗对高温超导微带天线输入阻抗和谐振频率的影响,把导体特性对天线的影响看作一种微扰来处理,对传统的传输线模型进行了修正,并通过与谱域矩量法相比较,验证了修正后方法的有效性.进而利用修正后的方法计算分析了高温超导矩形微带贴片天线的输入阻抗和谐振频率,给出了关于高温超导微带天线输入阻抗和谐振频率的若干结论. 相似文献
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以磁性材料(JV-5)作为基板,设计双L型结构的微带天线,带宽是普通基板的2倍以上,尺寸缩小了40%。在此基础上引入电磁带隙(EBG)结构,设计了一种基于磁性基板EBG结构的微带天线,该EBG结构采用接地板腐蚀性,即在地板上腐蚀出周期H型和圆形结构,采用电磁仿真软件HFSS14.0进行仿真设计。结果显示,与非磁性材料做基板的微带天线相比,EBG结构磁性材料具有小型化和宽频化突出优点,相对带宽达到10%以上,增益方面略有降低,引入EBG结构后能在一定程度上减小了天线的尺寸同时增大了天线的带宽,改善了天线的增益和辐射特性。 相似文献
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以磁性材料(JV-5)作为基板,设计双L型结构的微带天线,带宽是普通基板的2倍以上,尺寸缩小了40%。在此基础上引入电磁带隙(EBG)结构,设计了一种基于磁性基板EBG结构的微带天线,该EBG结构采用接地板腐蚀性,即在地板上腐蚀出周期H型和圆形结构,采用电磁仿真软件HFSS14.0进行仿真设计。结果显示,与非磁性材料做基板的微带天线相比,EBG结构磁性材料具有小型化和宽频化突出优点,相对带宽达到10%以上,增益方面略有降低,引入EBG结构后能在一定程度上减小了天线的尺寸同时增大了天线的带宽,改善了天线的增益和辐射特性。 相似文献
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微带天线全波频域法中的小波应用 总被引:2,自引:0,他引:2
本文将小波分析引到微带天线全波频域法的计算中,对矩形微带贴片天线感应电流矩量法的小波计算进行了理论推导。对一矩形微带贴片天线进行了实际计算,并与用脉冲基函数和三角形基函数进行计算得到了结果进行了比较。 相似文献
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《Antennas and Propagation, IEEE Transactions on》2009,57(6):1612-1617
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We proposed a novel electromagnetic band‐gap (EBG) cell‐embedded antenna structure for reducing the interference that radiates at the antenna edge in wireless access in vehicular environment (WAVE) communication systems for vehicle‐to‐everything communications. To suppress the radiation of surface waves from the ground plane and vehicle, EBG cells were inserted between micropatch arrays. A simulation was also performed to determine the optimum EBG cell structure located above the ground plane in a conformal linear microstrip patch array antenna. The characteristics such as return loss, peak gain, and radiation patterns obtained using the fabricated EBG cell‐embedded antenna were superior to those obtained without the EBG cells. A return loss of 35.14 dB, peak gain of 10.15 dBi at 80°, and improvement of 2.037 dB max at the field of view in the radiation beam patterns were obtained using the proposed WAVE antenna. 相似文献
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Ban-Leong Ooi 《Antennas and Propagation, IEEE Transactions on》2004,52(5):1286-1293
A modified contour integral method coupled with segmentation method has been used, for the first time, to analyze both the Sierpinski fractal carpet (SFC) antennas of different orders and an SFC antenna with electromagnetic band gap (EBG) ground plane. The close agreement between the calculated and measured results for resonant frequencies and input return losses indicates that this technique can be used to accurately predict the impedance characteristic. A novel stacked microstrip Sierpinski carpet fractal antenna using the EBG ground plane is also presented. Comparing to an ordinary microstrip fractal antenna, which has a maximum bandwidth of approximately 2%, the proposed antenna has a higher input impedance bandwidth of nearly 9%. The radiation patterns of the proposed antenna are improved due to the removal of unwanted radiation caused by the surface wave. The experimental measurement results of the proposed antenna are presented in this paper. 相似文献
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应用悬置微带线方法(SMM)对二维EBG结构进行了测量和计算。对二维电小EBG(UC—EBG和PV—EBG)的特性用SMM法进行了统一的实验和仿真分析。与其他方法对比,由于采用了“强耦合”结构,更能显现出二维电磁带隙结构的特性。同时提出了新型的悬置微带贴片的EBG天线,该天线结构紧凑,更利于EBG的实际应用。 相似文献
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基于复合左右手传输线基本原理, 提出了电磁带隙结构的双负媒质微带天线设计方法, 并制作了2.45 GHz的微带天线.该微带天线由2个单元的电磁带隙组成, 此电磁带隙结构经过优化采用非均匀结构, 可通过调整贴片尺寸和金属过孔半径来改变电磁带隙结构单元等效电路的并联部分电容和电感, 进而调节天线的谐振频率.设计并制作的微带天线其贴片整体尺寸为53.2 mm×19.8 mm, 在2.45 GHz的回波损耗为-32.6 dB, 方向图近似为8字形方向图, 最大增益为0.72 dB.仿真和测试的回波损耗、方向图符合得很好, 从而验证了这种设计方法的有效性. 相似文献
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Xiu‐long Bao Xiao‐wei Sun Zheng‐fan Li Wu‐yun Bao Rong Qian 《Journal of Infrared, Millimeter and Terahertz Waves》2004,25(12):1799-1804
The electromagnetic band‐gap (EBG) structure, also called photonic band‐gap structure, consisted by triangular arrays of air columns on the dielectric structure is designed and studied by using the FDTD method. According to the simulated and measured results, the EBG structure effectively suppressing surface wave for TE and TM modes is designed. The optimized EBG structure is presented.The proposed EBG structure is applied to the four‐element microstrip patch array antenna. As results of simulation and measurements, the impedance bandwidth and the gain of proposed EBG patch array antenna are improved. 相似文献
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This paper presents an efficient approach based on reciprocity for calculating the far-field radiation pattern of a center-fed helical microstrip antenna mounted on a circular cylinder. The reciprocity theorem is used to find a completely analytical solution to the problem assuming that the helical microstrip is sufficiently thin with a sinusoidal current distribution. Two degenerate cases of the helical microstrip antenna, i.e., an axially and an azimuthally fed half-wave cylindrical-rectangular patch, are examined and compared to known results in order to provide validation for the general analytical solution. Further comparisons are made between the analytical results and the results obtained using a numerically rigorous method of moments (MoM) computer code 相似文献
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