平面偶极子阵列用于4G LTE / WiMAX接入点的新型双频设计

抽象

一种新颖的平面与LTE / WiMAX接入点双频带工作偶极子阵列算法。阻抗带宽，从被确定, can reach about 525/747 MHz (20.2/21.3%) for the 2.6/3.5 GHz operating bands, respectively, which are covering the required bandwidth for LTE (2.5 ~ 2.7 GHz) and WiMAX (3.3 ~ 3.7 GHz) system. This proposed dual-band dipole array also provides maximum peak antenna gains and efficiencies of 7.3/7.5 dBi and 89/75% across 2.6/3.5 GHz bands, respectively, with good omnidirectional radiation pattern in XY-plane.

1.简介

近日，LTE（长期演进）和WiMAX（全球微波接入互操作性）的第四代（4G）移动通信系统已经吸引了在无线城域网（WMAN）环境中的宽带接入的高度关注。对于LTE / WiMAX基站或接入点，与在方位角平面全向辐射的高增益的阵列天线通常需要进行远距离通信。相关阵列设计已经提出通过使用两个偶极子阵列[1]，用三相半波长辐射元件[共线阵列天线2]，和四元件共线阵列天线[3]。然而，这些上述阵列天线都集中在单频带操作。对于双频段操作，只有阵列设计[4] had been proposed by using one dipole antenna for 2.4 GHz andarray antenna for 5.2 GHz WLAN communication. And, there was a disadvantage of lower antenna gain (less than 4 dBi), which was unsuitably in the practical applications for LTE/WiMAX access points. Meanwhile, dual-band dipole array for LTE/WiMAX applications is very scant in the open literature. Therefore, in this paper, we propose a novel planar dual-band dipole array mainly comprises two偶极子阵列背对背布置，并且可以通过在介质基片的两面上打印被容易地构建（参见图中所示的几何形状1）。By properly adjusting the arms’ lengths of each unsymmetrical dipole element, the operating bandwidths (VSWR ≦ 2.0) can reach about 525/747 MHz (20.2/21.3%), which are enough for LTE and WiMAX system. Also, the proposed dipole array provides maximum peak antenna gains and efficiencies of 7.3/7.5 dBi and 89/75% across 2.6/3.5 GHz bands, respectively, with good omnidirectional radiation pattern in the azimuthal plane and narrow-beamwidth pattern in the elevation plane. Details of the proposed dual-band dipole array designs are described, and experimental results for the obtained high-gain performance are presented and discussed.

2.天线设计和实验结果

数字1illustrates the geometry of the proposed omnidirectional dipole array antenna for 2.6/3.5 GHz LTE/WiMAX access points. The dimensions of the feeding network composed of the in-phase power divider with multisection binomial quarter wave transformers are shown in Figure2。The proposed dual-band array is fed by a 50 Ω coaxial cable line at the center of the 100 Ω microstrip line (point O) which is etched on the both printed sides of an inexpensive FR4 substrate with the volume of mm³， 介电常数和损耗角正切。This proposed planar dual-band array is comprised of four dipole back-to-back elements with the spacing of 78 mm, which are arranged symmetrically with respect to the central narrow rectangular ground plane of width 10 mm, printed on the rear surface of the FR4 substrate to obtain omnidirectional radiation pattern in the azimuthal plane. In this study, by introducing the inverted U-shaped strip with the length of 20 mm in the ground plane to form the unsymmetrical dipole element, the resonant mode operating at 3.5 GHz band can be excited due to the resonant length of the unsymmetrical dipole chosen to be corresponding approximately to 0.46 operating wavelength of 3.5 GHz band. And, a parasitic strip with the length of 26 mm is arranged parallel with the inverted U-shaped ground strip as the lower arm of the printed dipole element for the excitation of 2.6 GHz operating band with the resonant length of 45.5 mm, which is less than that of the conventional half-wavelength dipole to have compact operation.

为了证明上述扣除并保证模拟结果的正确性，电磁模拟器HFSS基于有限元法[五]已被应用于所提出的平面全向偶极子阵列设计。数字2示出了VSWR拟议平面双频偶极子阵列的相关的模拟和实验结果。相关结果列于表1作为比较。Results show the satisfactory agreement for the proposed planar dipole array operating at the 2.6/3.5 GHz bands. From the experimental results, the measured impedance bandwidths () can reach 525/747 MHz (20.2/21.3%) for 2.6/3.5 GHz bands, respectively, to provide more impedance bandwidth to meet the specifications of LTE and WiMAX systems. The 3D radiation patterns of the proposed dual-band dipole array are measured in anechoic chamber by using NSI-800F with Agilent PNA N5230A. Figure3示出了仿真和测量峰值增益和平面双频偶极子阵列的效率。The maximum measured peak antenna gains and efficiencies are 7.3/7.5 dBi and 89/75% across 2.6/3.5 GHz bands, respectively. Figure4shows the measured 2D radiation patterns of the proposed planar dipole array operating at 2.6/3.5 GHz bands. It is found that the radiation patterns are with good omnidirectional radiation patterns in the X-Y plane, which resemble typical patterns in symmetry with respect to the antenna axis因为所提出的偶极子阵列结构是对称的。

3.结论

一种新颖的平面双频偶极子阵列具有用于LTE / WiMAX接入点高增益操作已被提出并研究。It provides relatively wider impedance bandwidth of 525/747 MHz (20.2/21.3%) to meet the specifications of LTE (2.5 ~ 2.7 GHz) and WiMAX (3.3 ~ 3.7 GHz) systems, respectively. Also, the proposed dual-band dipole array provides maximum peak antenna gains and efficiencies of 7.3/7.5 dBi and 89/75% across the 2.6/3.5 GHz operating bands with good omnidirectional radiation pattern in the X-Y plane, respectively.

承认

本文由国家科学委员会（NSC），台湾，下格兰特NSC97-2221-E-022-005-MY3支持。

参考

1. K. L.黄，F. R.萧和T. W.邱，“全方向平面偶极阵列天线，”IEEE交易天线与传播卷。52，没有。2，第624-628，2004。查看在：出版商网站|谷歌学术
2. Y. T.柳，T. C.曾和K. L.黄，“高增益印刷偶极天线，”微波和光学技术快报卷。46，没有。3，第214-218，2005。查看在：出版商网站|谷歌学术
3. K. G. Thomas和N.列宁，“共线印刷阵列天线，”微波和光学技术快报卷。50，没有。6，第1582至1584年，2008年。查看在：出版商网站|谷歌学术
4. K. L. Wong, J. W. Lai, and F. R. Hsiao, “Omnidirectional planar dipole-array antenna for 2.4/5.2 GHz WLAN access points,”微波和光学技术快报卷。39，没有。1，第33-36页，2003。查看在：出版商网站|谷歌学术
5. Ansoft公司HFSS，http://www.ansoft.com/products/hf/hfss/。

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