基于矩形波导缝隙馈电的阵列天线设计

余龙舟; 袁成卫; 贺军涛; 张强

doi:10.11884/HPLPB201830.170443

基于矩形波导缝隙馈电的阵列天线设计

doi: 10.11884/HPLPB201830.170443

国防科技大学前沿交叉学科学院，长沙 410073

基金项目:

国家自然科学基金项目 61401485

详细信息

作者简介:
余龙舟(1988—), 男，博士研究生，从事高功率微波传输与辐射技术研究；cqycq1988@sina.com

中图分类号: TN814
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出版历程
- 收稿日期: 2017-11-08
- 修回日期: 2017-12-07
- 刊出日期: 2018-04-15

Design of array antenna based on slots coupling of rectangular wave-guide

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

摘要

摘要: 提出一种具有高功率容量的直线阵列天线，该天线阵基于矩形波导缝隙馈电，馈电耦合结构采用新型的弧形耦合缝隙，利用小螺旋天线作为辐射单元，通过旋转螺旋线内导体来调整各个辐射单元相位，从而实现一维波束扫描。采用等效传输法进行理论设计，数值模拟结果表明，该长度为3200 mm的单元天线在中心频率8.40 GHz上可获得的增益为27.50 dB，主瓣轴比为0.51 dB。功率容量约90 MW，辐射效率为97.10%，反射低于-24 dB，波束扫描范围±38°。
- 弧形缝隙 /
- 矩形波导 /
- 高功率微波 /
- 螺旋阵列 /
- 一维波束扫描
Abstract: A linear array antenna with high power-handling capacity is designed in this article, which is feed through slots of rectangle wave-guide. A new cambered slot coupling structure is applied in the antenna, which radiation element is a small antenna, and one dimension beam scanning is realized by rotating the inner conductor of the helical line to adjust the phase of the radiation element. The theoretical design is accomplished according to the equivalent transmission theory, the simulation results indicate that: one 3200.00 mm long array antenna has the gain of 27.50 dB at the frequency of 8.40 GHz, and the axial ratio is 0.51 dB. The power-capacity is about 90 MW, and the efficiency of the antenna is 97.10%. The reflectance is below -24 dB, and the beam scanning is ±38°.
- cambered slot /
- rectangular wave-guide /
- high power microwave /
- helix array /
- one dimension scanning

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图 1 弧形缝隙耦合结构示意图

Figure 1. Configuration of cambered slot

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图 2 耦合腔结构示意图

Figure 2. Configuration of the coupling cavity

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图 3 等效电导随缝隙转角的变化

Figure 3. Relationship between equivalent g and θ(ϕ=200°)

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图 4 等效电导随缝隙圆心角的变化

Figure 4. Relationship between equivalent g and ϕ(θ=16°)

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图 5 口径等效电导分布

Figure 5. Distribution of aperture equivalent conductance

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图 6 阵列天线模型

Figure 6. Configuration of array antenna

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图 7 φ=0°的远场方向图

Figure 7. Far field pattern of φ=0°

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图 8 Θ=0.6°的远场方向图

Figure 8. Far field pattern of Θ=0.6°

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图 9 波束偏转

Figure 9. Beam steering

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表 1 工作状态缝隙结构尺寸与波长的关系(θ=15°)

Table 1. Relationship between dimension of slot and wavelength (θ=15°)

r₁/mm	r₂/mm	ϕ/(°)	average arc length/mm	(λ/2-average arc length)/mm	g
3.00	5.00	225	15.71	0.26	0.032 4
3.50	5.50	200	15.71	0.26	0.032 7
4.00	6.00	181	15.80	0.17	0.032 4

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表 2 天线结构参数

Table 2. Parameters of antenna structure

R₁/mm	R₂/mm	r₁/mm	r₂/mm	a/mm	b/mm	s/mm	d/mm	h/mm
12.50	8.60	4.50	6.50	30.00	16.00	3.00	22.00	4.00

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参考文献(11)

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