一种宽带双极化共享折合臂天线设计

任晓飞; 王琼; 贺双

doi:10.12265/j.cjors.2021280

一种宽带双极化共享折合臂天线设计

doi: 10.12265/j.cjors.2021280

中国电波传播研究所, 青岛 266107

基金项目: 国家稳定支持项目(A131906W08)

详细信息

作者简介:
任晓飞：(1981—)，男，陕西人，工学博士，中国电波传播研究所高级工程师，研究方向为宽带阵列天线、智能天线、阵列信号处理等

王琼：(1992—)，女，河南人，硕士，中国电波传播研究所工程师，研究方向为微带天线、阵列天线等

贺双：(1993—)，女，山东人，硕士，中国电波传播研究所助理工程师，研究方向为超宽带天线、阵列天线理论等

通讯作者:
任晓飞 E-mail: renxf@crirp.ac.cn

中图分类号: TN828
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出版历程
- 收稿日期: 2021-10-21
- 录用日期: 2022-05-07
- 网络出版日期: 2022-05-07

Design of a wideband dual-polarized shared folded dipole antenna

China Research Institute of Radiowave Propagation, Qingdao 266107, China

摘要

摘要: 针对L、S波段双极化信号宽带监测，提出了一种宽带双极化共享折合臂（dual-polarized shared-folded-dipole，DPSFD）天线. 天线采用宽度渐变振子臂和共享折合枝节结构，这种设计使天线的相对带宽由原来的57.8%拓宽到85.7%，并改善了天线高频段方向图分裂的问题. 理论和实验测试表明：天线在1.6~4 GHz频带范围内，电压驻波比小于2，典型增益为8.3 dBi，天线尺寸仅为最低工作频率对应波长的28%. 新设计的天线可应用于通信信号宽带双极化监测系统中.
- 双极化天线 /
- 宽带天线 /
- 折合振子 /
- 小型化 /
- 共享臂天线
Abstract: A broadband dual polarization shared folded arm antenna is proposed for L and S-band dual polarization signal broadband monitoring. The antenna adopts width changing arms and a shared folding branch structure. This design widens the relative bandwidth of the antenna from 57.78% to 85.7%, and improves the problem of pattern splitting in the high frequency band of the antenna. Theoretical and experimental result show that the voltage standing wave ratio(VSWR) of the antenna is less than 2.0 in the frequency band of 1.6−4.0 GHz, the typical gain is 8.3 dBi, and the size of the antenna is only 28% the wavelength corresponding to the lowest frequency. The proposed antenna can be applied to broadband dual polarization monitoring system of communication signal.
- dual-polarized antenna /
- broadband antenna /
- folded dipole /
- miniaturization /
- shared dipole antenna

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图 1 DPSD天线等效电路图

Fig. 1 Equivalent circuit for the DPSD antenna

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图 2 宽带DPSFD天线模型

Fig. 2 The model of the wideband DPSFD antenna

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图 3 DPSFD天线结构

Fig. 3 Configuration of wideband DPSFD antenna

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图 4 增加共享折合臂的天线结构

Fig. 4 Antenna construction of increasing folded shared-dipole

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图 5 折合臂长度a₂对VSWR的影响

Fig. 5 The influence of length a₂ of folded shared-dipole on VSWR

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图 6 折合臂长度a₂对增益的影响

Fig. 6 The influence of length a₂ of folded shared-dipole on gain

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图 7 反射板高度H对VSWR与增益的影响

Fig. 7 The influence of reflector height H on VSWR and gain

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图 8 增加枝节耦合线的天线结构

Fig. 8 Antenna construction of increasing parasitic coupler elements

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图 9 耦合线宽度w₂对VSWR的影响

Fig. 9 The influence of coupler width w₂ on VSWR

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图 10 耦合线距传输线距离L_d1对VSWR的影响

Fig. 10 The influence of distance between coupler and transmission line L_d1 on VSWR

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图 11 宽带DPSFD天线实物图

Fig. 11 Photograph of the broadband DPSFD antenna

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图 12 天线的实测VSWR和隔离度

Fig. 12 Measured VSWR and isolation results of the antenna

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图 13 天线实测与仿真方向图对比

Fig. 13 Compared simulated and measured patterns of the antenna

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表 1 DPFSD天线结构参数

Tab. 1 Parameters of the wideband DPFSD antenna structure mm

参数	取值	参数	取值
a₁	50.0	L₁	8.0
a₂	36.0	w₂	1.0
w₁	1.2	L_d1	3.0
d	3.3	H	33.0

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表 2 不同频点天线的方向特性

Tab. 2 Characteristics of gain in different frequencies

频率/GHz	波束宽度/(°)	增益/dBi
1.6	80	7.8
2.0	76	8.3
2.7	76	8.5
3.0	74	8.7
3.5	70	8.9
4.0	86	6.9

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表 3 本文天线与相关文献天线性能比较

Tab. 3 Performance comparison of dual-polarized antennas

文献	天线尺寸	高度/mm	VSWR	隔离度/dB	频带/GHz
[3]	60 mm×60 mm	21	<2	>19	2.1~5.1
[4]	82 mm×82 mm	25	<2	>25	2.0~4.0
[10]	50 mm×50 mm	37	<2	>20	1.8~3.7
[15]	50 mm×50 mm	33	<2	>36	1.6~2.9
本文	50 mm×50 mm	33	<2	>22	1.6~4.0

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