A Low-Profile Dual-Band Antenna With Different Polarization and Radiation Properties Over Two Bands for Vehicular Communications
A Low-Profile Dual-Band Antenna With Different Polarization and Radiation Properties Over Two Bands for Vehicular Communications
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DOI：
10.1109/tvt.2018.2881765
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发表时间：
2019
影响因子：
6.8
通讯作者：
Lei Ge;Shuai Gao;Yujian Li;W. Qin;Jianpeng Wang
中科院分区：
文献类型：
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作者：
Lei Ge;Shuai Gao;Yujian Li;W. Qin;Jianpeng Wang
本通信论文提出了一种低剖面双频天线，在两个频段上具有不同的极化和辐射特性，用于车辆通信。双频特性是通过采用堆叠贴片结构来实现的。通过利用截顶方形贴片的 TM01 和 TM10 模式，在低频段实现了圆偏振的单向辐射图。利用下圆贴片的TM01和TM02模式，可以在高频段获得线性偏振的全向辐射。为了加宽天线带宽，在截角的方形贴片中蚀刻了一个U形槽，并插入12个导电过孔将圆形贴片短接到地平面。开发并测试了功能齐全的原型。测量结果表明，在低频段获得了2.49至2.54 GHz的轴比（AR）带宽（AR ≤ 3 dB）和2.34至2.57 GHz的阻抗带宽（S11 ≤ -10 dB），在高频段获得了3.54至4.40 GHz的阻抗带宽（S11 ≤ -10 dB）。在两个波段上观察到单向圆偏振和全向线性偏振。此外，所提出的天线还具有其他优点，例如薄型和高增益。凭借这些特点，所提出的设计非常适合应用在车辆上，以满足卫星和移动通信的需求。
A low-profile dual-band antenna with different polarization and radiation properties over two bands for vehicular communications is presented in this correspondence paper. The dual-band property is realized by employing a stacked-patch structure. By utilizing TM01 and TM10 modes of the truncated upper square patch, a unidirectional radiation pattern with circular polarization is achieved in the low band. By using TM01 and TM02 modes of the lower circular patch, omnidirectional radiation with linear polarization can be obtained in the high band. In order to widen the antenna bandwidth, a U-shaped slot is etched in the truncated square patch, and 12 conductive vias are inserted to short the circular patch to the ground plane. A fully functional prototype was developed and tested. The measurements show that an axial-ratio (AR) bandwidth (AR ≤ 3 dB) from 2.49 to 2.54 GHz and an impedance bandwidth (S11 ≤ −10 dB) from 2.34 to 2.57 GHz are obtained in the low band and an impedance bandwidth (S11 ≤ −10 dB) from 3.54 to 4.40 GHz is achieved in the high band. Unidirectional circular polarization and omnidirectional linear polarization are observed over two bands. In addition, the proposed antenna exhibits other advantages, such as low profile and high gain. With these characteristics, the proposed design is very suitable to be applied on a vehicle to meet both satellite and mobile communications.