基于慢波基片集成波导的X波段功分器设计

黄文; 陈肖; 任仪; 周正宜; 朱泓宇; 曾婷

doi:10.12265/j.cjors.2021142

基于慢波基片集成波导的X波段功分器设计

doi: 10.12265/j.cjors.2021142

重庆邮电大学光电工程学院，重庆 400065

基金项目: 国家自然科学基金(61871063)

详细信息

作者简介:
黄文：(1984—)，女，重庆人，重庆邮电大学光电工程学院副教授，博士，研究方向为微波射频电路及天线

陈肖：(1998—)，男，重庆人，重庆邮电大学硕士研究生，研究方向为微波射频电路

任仪：(1982—)，男，安徽人，重庆邮电大学光电工程学院教授，博士，研究方向为微波射频电路及天线

通讯作者:
黄文 E-mail：huangwen@cqupt.edu.cn

中图分类号: TN626
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-19
- 网络出版日期: 2021-08-27

Design of X-band power divider based on slow-wave substrate integrated waveguide

College of Electronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

摘要

摘要: 针对传统基片集成波导（substrate integrated waveguide，SIW）功分器设计中宽带化和小型化不易兼顾的问题，提出了一种基于慢波SIW（slow-wave SIW, SW-SIW）的功分器. 采用微带折线构成的慢波结构单元加载于SIW金属表面上，代替传统SIW连续的金属表面，与同尺寸的SIW相比，SW-SIW的截止频率下降了40%，能够实现横向尺寸的缩减，尤其当SW-SIW达到与SIW相同的相移量时，SW-SIW所需纵向尺寸更小. 所提出的基于SW-SIW的功分器在具有较宽带宽的同时实现了器件尺寸的减小. 通过测试结果可得，该功分器在8.25～12.8 GHz频带内的反射系数|S₁₁|<−10 dB，相对带宽达到了43.2%，相位一致性良好且小型化效果明显，适用于紧凑型微波射频前端.
- 基片集成波导（SIW） /
- 慢波 (SW) /
- 功分器 /
- 小型化 /
- 宽带化
Abstract: To solve problem that it is not easy to account both broadband and miniaturization in the design of traditional substrate integrated waveguide (SIW) power divider, a power divider based on slow-wave substrate integrated waveguide (SW-SIW) is proposed in this paper. The slow-wave structure units composed of microstrip lines are loaded on the metal surface of SIW instead of the continuous metal surface of traditional SIW. Compared with SIW of the same size, the cut-off frequency of SW-SIW is decreased by 40%, which can reduce the lateral size of the substrate integrated waveguide. When SW-SIW and SIW have the same phase shift, the longitudinal dimension of SW-SIW is smaller than SIW. The proposed power divider based on SW-SIW is achieved a size reduction with a wide bandwidth. The measurements show that the power divider has a bandwidth of 43.2% from 8.25 GHz to 12.8 GHz with the reflection coefficient |S₁₁| less than −10 dB. The phase consistency is good, and the miniaturization effect is obvious, so the proposed power divider is suitable for the application of compact microwave radio frequency front-end.
- substrate-integrated waveguide (SIW) /
- slow-wave (SW) /
- power divider /
- miniaturization /
- broadband

HTML全文

图 1 SIW结构图

Fig. 1 SIW structure diagram

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图 2 SW-SIW及单元结构示意图

Fig. 2 Schematic diagram of the SW-SIW and unit

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图 3 S参数仿真结果

Fig. 3 Simulation results of S parameter

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4 频率均为12.5 GHz时电场图对比

4 Comparison of electric fields at 12.5 GHz

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图 5 SW结构单元等效电路

Fig. 5 Equivalent circuit of the SW structure unit

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6 SW结构单元等效电路仿真结果与HFSS仿真结果对比

6 Comparison between the SW structure unit equivalent circuit simulation results with HFSS simulation results

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图 7 H-T分支结构

Fig. 7 H-T branch structure

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图 8 SW-SIW功分器

Fig. 8 SW-SIW power divider

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图 9 SW-SIW功分器实物图

Fig. 9 Photo of the SW-SIW power divider

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10 SW-SIW功分器仿真和测试结果对比

10 Simulated and measured results of SW-SIW power divider

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表 1 SW-SIW的结构参数

Tab. 1 Structural parameters of SW-SIW

参数	取值/mm	参数	取值/mm
L₁	0.50	W₁	9.50
L₂	0.75	W_t	2.40
L₃	0.15	L_t	4.00
L₄	0.30	p	0.90
L₅	0.30	d	0.50
L₆	0.30	W₅₀	1.50
L₇	0.40	w	0.10
a	2.25	b	1.70

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表 2 所提出的功分器与已报道SIW功分器性能对比

Tab. 2 Performance comparison between the proposed power divider and the reported SIW power divider

文献	基本结构	中心频率/GHz	相对带宽/%	尺寸	插入损耗/dB	幅度不平衡度/dB	相位不平衡度/(°)
[14]	环形SIW	10.0	27.0	0.70λ_g×0.71λ_g	0.75	±0.5	±5.0
[15]	SIW+DGS	9.0	22.3	1.60λ_g×1.20λ_g	1.10	±0.2	±2.0
[16]	SIW+吸波材料	16.5	36.0	2.00λ_g×3.06λ_g	1.20	±0.5	±2.2
本文	SW-SIW	10.5	43.2	1.50λ_g×0.90λ_g	1.20	±0.6	±2.0

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参考文献(16)

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