共查询到17条相似文献,搜索用时 62 毫秒
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一种宽带天线的研究与设计* 总被引:1,自引:0,他引:1
为了满足宽带通信的需求,利用U形单极子天线和两个U形寄生辐射元的方法,设计了一种共面波导馈电的宽带天线,其阻抗带宽达到85%。所设计的天线印刷在尺寸为20 mm×30 mm×1.6 mm、介电常数为265的聚四氟乙烯介质基板上。为了满足无线局域网(WLAN)和全球互联微波接入(WiMAX)的工作需要,抑制不需要的信号,在U形单极子辐射元之间插入一条调谐微带线,产生一个陷波特性,使所设计的天线满足WLAN、WiMAX和低端UWB通信需求。利用高频结构仿真软件HFSS对影响天线性能的主要参数进行仿真、分析和优化,得到天线的优化尺寸,并对优化的天线进行制造和测试。实验结果表明,该天线比传统微带贴片天线性能有了较大的提高,证明了利用共面波导馈电和寄生技术设计宽带天线的可行性和有效性。 相似文献
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设计了一种简单的共面波导馈电单极子天线,给出了实验设计与仿真结果。结果表明,该天线具有良好的辐射特性,可覆盖GSM900、DCS1800、IEEE802.11.a、IEEE802.11.b和HiperLAN-2带宽。该天线体积小,尺寸仅为32mmx31mmx1.6mm,基板的介电常数为4.4。 相似文献
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本文提出了一种基于共面波导结构的工作频率在2.45GHz和5.8GHz的双频带天线的设计。该天线采用了增加突出结构和边缘开槽的方法,通过时域有限差分法(FDTD)对共面波导尺寸的变化进行了仿真与优化,得出了共面波导结构对天线性能的影响,从而给出了相应的结构尺寸。并实际测量了天线的反射参数以及方向图,对比测量结果与仿真结果基本符合。最后本文对本次天线设计做出总结并对测量结果做了误差分析。 相似文献
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基于分形理论对天线的讨论 总被引:1,自引:0,他引:1
利用分形理论设计出的分形天线和分形天线阵,具有小巧、灵活、轻便、同时还具有多频带、宽频带和“自加载”特性,它们存在多种多样形式,在军事工业和通信行业将有很大的发展潜力。 相似文献
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提出了一种具有宽带特性的小型化双频双极化差分天线。天线由双层介质板组成。辐射贴片位于上层介质板上表面,低频谐振由方环贴片提供,高频谐振由方形贴片和寄生条带共同提供,其中方形贴片被方环贴片包围,形成紧凑的嵌套式结构,四个端口提供了两组正交的差分馈电对,使天线具有双极化特性。差分馈电的共模抑制特性可提高端口隔离度并降低交叉极化。 相似文献
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类Minkowski分形天线的分析与设计 总被引:1,自引:0,他引:1
为了实现一款天线在ISM2.4G(2.4~2.483 5 GHz)、Bluetooth、GPS、WLAN(2.4~2.48 GHz)等多频段同时工作,设计了基于分形理论的类Minkowski分形微带天线,方案中对原有的Minkowski分形结构和接地板进行改进。通过仿真分析与优化设计使得天线尺寸缩减至90 mm×71 mm×1.6 mm,谐振频率为2 GHz,工作在0.93 GHz~3.02 GHz频段,相对带宽为105.82%,最大增益可达1.89 dB。最终天线能够进行良好的阻抗匹配,对天线带宽进行展宽,达到了超宽频带天线的要求。 相似文献
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This paper presents a novel ultra‐wideband (UWB) antenna printed on a 70 μm thick flexible substrate. The proposed antenna consists of a hybrid‐shaped patch fed by coplanar waveguide (CPW). The ground planes on opposite sides of the feeding line have different height to improve antenna bandwidth. Simulation shows that the proposed antenna maintain wide bandwidth when changing its substrate's thickness and dielectric constant, as well as bending the antenna on a cylindrical foam. The proposed antenna is fabricated in laboratory with a simple and low‐cost wet printed circuit board (PCB) etching technique. Measured bandwidths cover 3.06 to 13.58, 2.8 to 13.55, and 3.1 to 12.8 GHz in cases of flat state and bent with radii of 20 and 10 mm, respectively. Measured radiation patterns show the antenna is omnidirectional in flat and bent cases. 相似文献
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A flower‐shaped ultra‐wideband fractal antenna is presented. It comprises a fourth iterative flower‐shaped radiator, asymmetrical stub‐loaded feeding line, and coplanar quarter elliptical ground planes. A wide operating band of 12.12 GHz (4.58‐16.7 GHz) for S 11 ≤ ? 10 dB is achieved along with an overall antenna footprint of 15.7 × 11.4 mm2. In addition, other desirable characteristics, that is, omnidirectional radiation patterns, peak gain upto 5 dB, and fidelity factor more than 75% are achieved. A good agreement exists between the simulation and measured results. The obtained results illustrate that this antenna has wide operating range and compact dimensions than available structures. 相似文献
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自适应信号处理是下一代高性能移动通信技术中一项重要的必不可少的技术。而宽带智能天线的自适应处理技术则是自适应技术中一个重要的研究分支。本文对无线通信中的智能天线自适应处理技术的发展和现状进行了介绍,针对宽带智能天线优化算法高复杂性,提出了一种新的基于频不变理论的波束优化,并对算法性能进行分析。 相似文献
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In this communication a 2 × 2 dielectric resonator antenna (DRA) array is proposed with a wideband frequency response. An air bridgeless coplanar waveguide (CPW) power divider network is first time used to feed the 2 × 2 DRA array. Four rectangular DRAs are used as array element and exited in TE111 mode by four slots at the end of the CPW lines in the feed network. The straight CPW phase delay line in feed network is further meandered resulting an enhanced radiation performance. The proposed DRA array exhibits a wideband response with an impedance bandwidth of 16% while maintaining a stable broadside radiation pattern with the gain range from 8 to 9.4 dBi. The proposed design is fabricated and measured, reaching good agreement with simulation results. 相似文献
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A novel wideband slot antenna with Koch fractal metasurface structure is presented in this letter. Using Koch metasurface as a slot edge, the proposed antenna obtains excellent performance in bandwidth. For optimal bandwidth, optimization is done for both iteration angle (IA) and iteration factor (IF) at each iteration order (IO). The measured results show that the impedance bandwidth of the optimized antenna can reach about 1.75 octaves (1.45‐4.86 GHz) for VSWR ≤ 2. In addition, stable radiation patterns are observed over the whole operating band of the proposed antenna. 相似文献
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Sectored antennas with wideband operation for wireless communication systems are presented. The proposed configurations are based on a coplanar waveguide fed slot antenna using metallic strip loadings and a widened tuning stub above various reflector shapes. By shaping the reflector, noticeable enhancements in both unidirectional radiation pattern and beamwidth can be achieved while maintaining the simple fabrication and installation. Based on the results obtained, three sector antennas covering 72°, 90°, and 120° beamwidths suitable for five, four, and three sectors, respectively, have been proposed and designed. The simple structural configurations, low cost, and ease of half power beamwidth control of the proposed antennas make the design very attractive for practical implementation. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011. 相似文献