W波段混合高阶模准椭圆波导滤波器研究

严小龙; 王昱; 严驰陆; 丁江乔

doi:10.11884/HPLPB202638.250414

W波段混合高阶模准椭圆波导滤波器研究

doi: 10.11884/HPLPB202638.250414

1.
南京信息工程大学电子与信息工程学院，江苏省大气环境与装备技术协同创新中心，南京 210044
2.
南京信息工程大学长望学院，南京 210044

基金项目: 国家自然科学基金项目(12003011)

详细信息

作者简介:
严小龙，19816095882@163.com

通讯作者:
丁江乔，jqding@nuist.edu.cn。

中图分类号: TN73
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- 被引次数: 0
出版历程
- 收稿日期: 2025-11-20
- 修回日期: 2026-01-16
- 录用日期: 2026-01-12
- 网络出版日期: 2026-01-29

W-band Waveguide Filters Using Hybrid Higher-Order Modes for Quasi-Elliptic Response

1.
School of Electronic and Information Engineering, Nanjing University of Information Science & Technology, Jiangsu Collaborative Innovation Center for Atmospheric Environment and Equipment Technology, Nanjing 210044, China
2.
Changwang School of Honor, Nanjing University of Information Science & Technology, Nanjing 210044, China

摘要

摘要: W波段是重要的窗口频段，在高容量通信、高分辨率成像和高精度探测等毫米波领域具有重要前沿应用价值。针对新一代W波段固态高集成收发机系统的应用需求，提出一款低损耗、低阶数、易加工的波导型准椭圆带通滤波器。该滤波器基于2个混合高阶谐振腔，结合偏移磁耦合方法，实现带两个传输零点的4阶准椭圆响应，带外抑制性能良好。主要内容包括：W波段混合高阶模滤波器的结构拓扑设计；混合谐振模式（TE₂₀₁/TE₁₀₂和TE₃₀₁/TE₁₀₂）与传输零点产生机理与独立性分析；错位偏移磁耦合结构特征；滤波器整体性能优化及其H面分裂式CNC加工等。实测结果表明，该滤波器的有效通带为91.5 GHz至98 GHz，3 dB相对带宽为7%，带内插入损耗低至0.4 dB，回波损耗优于15 dB。除高频边带有少量偏移外，实测结果与仿真结果高度一致，验证了该器件的易加工、易集成与易频率拓展等特点。
- 毫米波 /
- W波段 /
- 混合谐振模 /
- 混合高阶模滤波器 /
- 低插入损耗 /
- 易CNC加工
Abstract: Background
The W-band constitutes a critical atmospheric window in the millimeter-wave spectrum, with significant importance for advanced applications such as high-capacity communications, high-resolution imaging, and high-precision sensing. As essential components within core millimeter-wave transmitter and receiver systems, filters fundamentally determine transceiver performance. However, conventional designs frequently face challenges in simultaneously achieving high electrical performance and favorable manufacturability, representing a key obstacle in contemporary W-band filter development.
Purpose
This work aims to develop a low-loss, low-order, and readily fabricable waveguide quasi-elliptic bandpass filter for the W-band. The goal is to maximize structural simplicity while maintaining high performance, thereby addressing the requirements of next-generation highly-integrated transceiver systems.
Methods
The proposed filter employs a novel H-plane offset magnetic coupling configuration, which simplifies the input–output coupling mechanism. Guided by quasi-elliptic filtering theory, transmission zeros are generated on both sides of the passband through the excitation of TE₂₀₁/TE₁₀₂ and TE₃₀₁/TE₁₀₂ hybrid modes in two respective resonant cavities, resulting in enhanced out-of-band suppression. The filter is implemented in a split-block architecture and fabricated via high-precision computer numerical control (CNC) milling.
Results
Measured results demonstrate an operational passband from 91.5 GHz to 98 GHz, corresponding to a 3 dB fractional bandwidth of 7%, with an in-band insertion loss as low as 0.4 dB and a return loss greater than 15 dB. Except for a slight deviation observed at the upper band edge, the experimental data show strong agreement with simulation, confirming the design’s manufacturability, integration compatibility, and high-frequency performance.
Conclusions
A compact, low-loss W-band quasi-elliptic filter has been successfully realized using only two hybrid-mode cavities. The presented design exhibits notable advantages in terms of fabrication ease, integration suitability, and electrical performance, providing a viable solution for advanced millimeter-wave system applications.
- millimeter-wave /
- W-band /
- hybrid resonant mode /
- Hybrid High-Order Mode Filter /
- low insertion loss /
- CNC-friendly fabrication

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图 1 新型混合高阶模滤波器的三维模型

Figure 1. 3D model of a novel hybrid mode filter

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图 2 带通滤波器耦合拓扑结构

Figure 2. Bandpass filter coupling topology

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图 3 两种混合高阶模谐振腔结构磁场分布

Figure 3. Magnetic field distributions of the resonator

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图 4 TE₁₀₁模与三种高阶模谐振频率随尺寸误差（Δw）的变化曲线

Figure 4. Variation curves of resonant frequency versus dimensional error (Δw) for TE₁₀₁ mode and three higher-order modes

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图 5 a₁和a₂与滤波器传输零点之间的关系

Figure 5. The relationship of the coefficients a₁ and a₂ with the transmission zeros in a filter

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图 6 直接耦合结构

Figure 6. Direct coupling structures

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图 7 混合高阶模滤波器仿真结果

Figure 7. Simulation Results of the Hybrid-Mode Filter

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图 8 混合高阶模滤波器加工结构设计

Figure 8. Structural design for fabrication of hybrid higher-order mode filters

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图 9 混合高阶模滤波器实物结构的实物照片测试环境

Figure 9. Physical structure of the hybrid mode filter: (a) photograph of the fabricated prototype, (b) test environment

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图 10 混合高阶模滤波器实物测试结果

Figure 10. Measured Results of the Hybrid Mode Filter

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表 1 滤波器性能对比

Table 1. Comparison of filter performance

	f₀/GHz	number of cavities	no. of TZs	mode	insertion loss/dB	fractional bandwidth/%	BW_{3 dB}/BW_{40 dB}
Ref. [6]	97.5	5	0	TE₁₀	0.76	5.62	−
Ref. [6]	105.4	5	0	TE₁₀	0.88	4.99	−
Ref. [9]	100.0	4	0	TM₁₂₀/TE₁₀₁	0.50	6.90	−
Ref. [20]	300.0	5	3	TE₁₀₃/TE₂₀₁	1.50	2.00	0.66
Ref. [21]	295.0	4	2	TM₁₁₀/TE₁₀₁	0.75	5.50	0.74
this work	95.0	2	2	TE₁₀₂/TE₂₀₁,TE₃₀₁/TE₁₀₂	0.40	7.00	0.56

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