应用于超宽带的小尺寸宽带共面波导馈电分形天线
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摘要
超宽带技术需要小尺寸、宽带宽和良好全向辐射图的天线,因此提出了一种紧凑型非对称共面波导馈电阶梯状超宽带分形天线。利用H形辐射体、改进馈线结构、非对称馈电和开槽接地板技术实现了4.56 GHz～13.10 GHz的阻抗带宽。在工作频带内所有频率点的H平面上实现了全向辐射方向图。E面方向图在较低频率时是双向的并在较高频率时转变为定向的。此外,针对3种不同的基底材料对所设计天线结构进行了分析。实验结果验证了所设计天线结构的适用性。与其他天线相比,该天线结构的平均增益为2.84 dB,尺寸较小且带宽更高。
Ultra-wideband technology requires antenna with small size,wide bandwidth,and good omnidirectional radiation patterns. Therefore,a compact asymmetric coplanar waveguide feed stepped ultra-wideband fractal antenna is proposed. The impedance bandwidth of 4.56 GHz～13.1 GHz is achieved by H-shaped radiator,improved feeder structure,asymmetric feed and slotted ground plate technology. An omnidirectional radiation pattern is implemented on the H plane at all frequency points within the operating band. The E-plane pattern is bidirectional at lower frequencies and becomes directional at higher frequencies. In addition,the designed antenna structure was analyzed for three different base materials. Experimental results verify the applicability of the designed antenna structure. Compared with other antennas,the antenna structure has an average gain of 2.84 dB,a smaller size and a higher bandwidth.
Ultra-wideband technology requires antenna with small size,wide bandwidth,and good omnidirectional radiation patterns. Therefore,a compact asymmetric coplanar waveguide feed stepped ultra-wideband fractal antenna is proposed. The impedance bandwidth of 4.56 GHz～13.1 GHz is achieved by H-shaped radiator,improved feeder structure,asymmetric feed and slotted ground plate technology. An omnidirectional radiation pattern is implemented on the H plane at all frequency points within the operating band. The E-plane pattern is bidirectional at lower frequencies and becomes directional at higher frequencies. In addition,the designed antenna structure was analyzed for three different base materials. Experimental results verify the applicability of the designed antenna structure. Compared with other antennas,the antenna structure has an average gain of 2.84 dB,a smaller size and a higher bandwidth.
引文
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[2] 陈显明,刘书焕.一种新的平面椭圆单极子超宽带天线[J].压电与声光,2016,38(1):162-165.
[3] 胡章芳,胡银平,罗元,等.具有陷波特性的改进Sierpinski分形超宽带天线[J].电子与信息学报,2017,39(6):1520-1524.
[4] Ghatak R,Karmakar A,Poddar D R.Hexagonal Boundary Sierpinski Carpet Fractal Shaped Compact Ultrawideband Antenna with Band Rejection Functionality[J].AEUE—International Journal of Electronics and Communications,2013,67(3):250-255.
[5] Maza A R,Cook B,Jabbour G,et al.Paper-Based Inkjet-Printed Ultra-Wideband Fractal Antennas[J].Iet Microwaves Antennas & Propagation,2012,6(12):1366-1373.
[6] Jahromi M N,Falahati A,Edwards R M.Bandwidth and Impedance-Matching Enhancement of Fractal Monopole Antennas Using Compact Grounded Coplanar Waveguide[J].IEEE Transactions on Antennas & Propagation,2011,59(7):2480-2487.
[7] Li Y S,Yang X D,Liu C Y,et al.Analysis and Investigation of a Cantor Set Fractal UWB Antenna with a Notch-Band Characteristic[J].Progress in Electromagnetics Research B,2011,33(33):13010-13018(9).
[8] Raj Kumar,Malathi P.On the Design of CPW-Feed Diamond Shape Fractal Antenna for UWB Applications[J].International Journal of Electronics,2011,98(9):1157-1168.
[9] Krishna D D,Gopikrishna M,Aanandan C K,et al.Compact Wideband Koch Fractal Printed Slot Antenna[J].Iet Microwaves Antennas & Propagation,2009,3(5):782-789.
[10] Fallahi H,Atlasbaf Z.Study of a Class of UWB CPW-Fed Monopole Antenna with Fractal Elements[J].IEEE Antennas & Wireless Propagation Letters,2013,12(3):1484-1487.
[11] 胡少文,吴毅强,张云,等.具有带阻特性的新型超宽带天线研究[J].电子器件,2014,37(4):622-625.
[12] 吴毅强,张平平,胡少文,等.一种新型的具有带阻特性的超宽带天线[J].电子器件,2014,37(1):1-4.
[13] 王善进,雷瑞庭,刘华珠,等.一款结构简单的双陷波超宽带天线[J].电子器件,2016,39(5):1048-1051.
[14] 邵吕霞.超宽带高保真天线的研究与设计[D].苏州:苏州大学,2011.
[15] Quintero G,Zurcher J F,Skrivervik A K.System Fidelity Factor:A New Method for Comparing UWB Antennas[J].IEEE Trans Antennas Propag,2011,59(7):2502-2512.