共查询到20条相似文献,搜索用时 140 毫秒
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提出一种紧凑型双层微带天线,在贴片上开"十"形缝隙来实现天线的双频带,通过加载短路探针和接地板挖槽的方法降低天线的谐振频率,提高带宽和实现小型化。利用电磁仿真软件HFSS 13.0对天线进行了仿真,仿真结果表明,该天线在回波损耗小于-10.0 d B时,天线工作频段为2.38~2.77 GHz,带宽约为390 MHz,天线的相对带宽为15.15%,天线的尺寸相对于普通微带天线降低了65.41%,该天线的带宽有很大的提高,且结构简单易实现,可用于无线通信系统中。 相似文献
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利用缝隙对天线带宽的影响设计了四种宽带微带天线。主要研究了缝隙的形状和大小以及与馈电的距离对天线带宽的影响。首先,宽缝机构可以较大的展宽天线的频带,如果同时配合在贴片上适当的开缝,带宽将进一步展宽;其次,相同缝隙结构的嵌套可使天线同时谐振在很多的频率,从而增加带宽。设计表明这几种微带天线都具有宽带特性,尤其是前两种天线具有超宽带(UWB)的特性,后两种天线的带宽也达到了48%以上。 相似文献
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介绍了一种利用变形地板来展宽平面三角形单极子天线带宽的方法。通过在天线地板上刻蚀对称的变型L型缝隙,天线的阻抗带宽增加到2.5~10.8 GHz,带内驻波比(VSWR)<2。对比没有刻蚀缝隙的天线,不仅工作频带得到展宽,而且保持了较好的辐射性能。测量和仿真结果表明,天线的工作频带能够覆盖整个超宽带(UWB)范围。 相似文献
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设计了一种工作于S波段的多频缝隙微带天线。以基本矩形双频微带天线为基础,采用同轴馈电,通过在矩形贴片上加载圆形和矩形缝隙改变表面电流分布,实现天线的多频段工作。采用基于有限元方法的电磁仿真软件HFSS 14.0对所设计的多频天线进行仿真与优化。仿真分析结果表明,该天线工作在2.04,2.50和2.97 GHz三个工作频段上,回波损耗值分别为-26,-22和-29 dB,-10 dB阻抗带宽分别为2.01~2.07 GHz,2.44~2.55 GHz和2.95~2.99 GHz,最大增益分别为1.79,3.28和3.9 dB。该多频段微带天线具有体积小、回波损耗低等优点,可用于无线通信系统。 相似文献
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通过对传统缝隙微带天线的分析,提出了一种h形缝隙微带天线.该天线具有多频带、小型化等特点,通过加载短路探针和在接地板挖槽的方法降低了天线的谐振频率,提高了带宽.利用基于有限元法的电磁仿真软件HFSS11.0对天线的特性进行了仿真,仿真结果表明,该天线在回波损耗S11<-10 dB时,其工作频段为2.38~2.79 GHz,4.59~4.75 GHz和5.12~5.90 GHz,尺寸比普通微带天线降低了62.43%,从而验证了这种设计方案的有效性.该天线结构简单易于实现,能够满足无线局域网802.11a/b/g/n移动终端内置天线的多频带和小型化的要求. 相似文献
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研究了一种单馈条件下双频圆极化微带天线的设计方法,通过开槽的方式实现了小型化,采用辐射边加载实现了阻抗带宽的展宽,采用电磁仿真软件HFSS进行了仿真,得到了天线的VSWR、AR以及增益等指标,对这些指标进行分析后,证明了该天线设计方法的可行性与正确性。 相似文献
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Novel dual-frequency and broad-band designs of slot-loadedequilateral triangular microstrip antennas
Jui-Han Lu Chia-Luan Tang Kin-Lu Wong 《Antennas and Propagation, IEEE Transactions on》2000,48(7):1048-1054
By loading properly arranged slots in an equilateral-triangular microstrip patch, novel dual-frequency and broad-band operations of a single-feed triangular microstrip antenna are presented. For dual-frequency operation, the proposed design is achieved by loading two pairs of narrow slots in the triangular patch, one embedded close to the side edges of the patch and the other inserted at the bottom edge of the patch. The obtained two operating frequencies are of same polarization planes and by varying the positions and lengths of the inserted slots at the bottom edge of the patch, a tunable frequency ratio of the two frequencies ranging from about 1.16 to 2.06 is obtained. Furthermore, it is found that by protruding a narrow slot out of the embedded slots close to the side edges, broad-band operation of the triangular microstrip antenna near its fundamental resonant mode can be achieved. Results show that the antenna bandwidth of the proposed broad-band design can be greater than 2.6 times that of a conventional triangular microstrip antenna. Details of the proposed dual-frequency and broad-band designs are described and typical experimental results are presented and discussed 相似文献
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Shyh-Tirng Fang Kin-Lu Wong Tzung-Wern Chiou 《Electronics letters》1998,34(23):2184-2186
By embedding a pair of properly-bent narrow slots in an equilateral-triangular microstrip patch, broadband operation of microstrip antennas with an inset microstrip-line feed can be achieved. With the proposed antenna design, the impedance bandwidth can be as large as ~3.0 times that of a corresponding simple triangular microstrip antenna. Some simple design rules for the proposed antenna have also been determined experimentally. The design rules and experimental results are presented and discussed 相似文献
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Analysis of Modified Square Sierpinski Gasket fractal microstrip antenna for Wireless communications
In this paper, the slot loaded microstrip antenna has been developed with Sierpinski gasket technique. The proposed Modified Square Sierpinski Gasket (MSSG) fractal antenna involves a square patch utilizing Sierpinski gasket (triangular) structure. Four triangular slots are loaded at each iteration. The structure is then simulated using commercially available Ansoft HFSS simulator. The multi-band operation has been achieved by the proposed antenna at 15.915 GHz, 20.045 GHz, 23.077 GHz, 27.77 GHz frequencies with −20 dB, −25 dB, −22 dB, −28 dB return loss respectively which works well for Ku (12–18 GHz) and K (18–27 GHz) band. The consistent result is obtained after simulation and the validity of fabricated design is checked by the measured result. The designed antenna is an attractive candidate for applications like wireless multi-band communication systems. 相似文献
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设计了一种应用于智能交通系统(ITS)的三频微带天线,分别工作在GPS(1. 575GHz)、WLAN(2.
45GHz)以及DSRC(5. 8GHz)。采用堆叠结构实现大的双频比,其中顶层贴片工作在DSRC,底层贴片通过边缘处加
载四个相等矩形槽来实现双频。通过在方形贴片的一个对边边缘处加载两个相等的矩形槽来实现圆极化。通过调
整对角线上馈电点位置、平移顶层贴片以及改变底层贴片上的过孔大小来实现频带内的阻抗匹配。仿真和测试结
果表明吻合良好,该天线在三个频段内有着良好的阻抗匹配、轴比以及辐射方向图,能够满足设计要求。 相似文献
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Kin-Lu Wong Wen-Shan Chen 《Electronics letters》1998,34(18):1713-1714
By loading a pair of narrow slots close to the radiating edges of a bow-tie microstrip antenna, dual-frequency operation can be obtained using a single probe feed. Various frequency ratios, within the range 2.0-3.0, of the two operating frequencies can be obtained by varying the flare angle of the bow-tie patch. Details of the antenna design and experimental results are presented and discussed 相似文献
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微带贴片天线已广泛应用于雷达系统,文中介绍了一种新型背腔式单层微带贴片天线,辐射贴片采用微带线馈电,为增加工作带宽,提供了两种不同的贴片形状,第一种是E形贴片,仿真及测试结果表明,此种单元在驻波比优于2的条件下可实现45%的阻抗带宽,但该单元的波瓣带宽较窄。为抑制交叉极化,通过在E形贴片上开四个槽,得到了第二种改进的E形贴片。该单元可实现14%的频带内驻波比优于1.5,同时交叉极化优于-15dB。对C波段8×16单元实验小阵的测试结果表明,该天线在17.9%的频段内具有良好的交叉极化性能及较高的工作效率。 相似文献
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A novel sextuple band-notched UWB antenna was designed. Sextuple band-notched characteristics could be realized by adding a T-shaped stub, a bent stub, and etching a U-shaped slot on the patch, adding a C-shaped stub, an anti-C shaped stub near microstrip line and etching a pair of L-shaped slots on the ground plane,which effectively sup-presses the interference between narrow band systems and UWB systems. The influence of the proposed structures on band-notched characteristics was studied, and band-notched principle was explained by antenna surface current and equivalent circuit. Finally the antenna was fabricated and measured. The measured results of VSWR, radiation patterns and gains agree well with the simulated results, which demonstrates the correctness of the design method. The proposed antenna has good performance and can be widely used due to its sextuple band-notched characteristics. 相似文献
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A novel compact circularly polarised microstrip antenna with a slotted ground plane is proposed. By embedding a group of four bent slots in the ground plane and truncating a pair of patch comers in the radiating square patch, the proposed antenna can perform circular polarisation (CP) operation with a reduced antenna size at a fixed operating frequency. In addition, enhanced CP bandwidth and antenna gain for the proposed design are observed. Details of the antenna design and experimental results are presented and discussed 相似文献