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

Yan Xiaolong; Wang Yu; Yan Chilu; Ding Jiangqiao

doi:10.11884/HPLPB202638.250414

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Article Navigation > High Power Laser and Particle Beams > 2026 > Accepted Manuscript

Yan Xiaolong, Wang Yu, Yan Chilu, et al. W-band Waveguide Filters Using Hybrid Higher-Order Modes for Quasi-Elliptic Response[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250414

Citation:

Yan Xiaolong, Wang Yu, Yan Chilu, et al. W-band Waveguide Filters Using Hybrid Higher-Order Modes for Quasi-Elliptic Response[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250414

Yan Xiaolong, Wang Yu, Yan Chilu, et al. W-band Waveguide Filters Using Hybrid Higher-Order Modes for Quasi-Elliptic Response[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250414

Citation:

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

doi: 10.11884/HPLPB202638.250414

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

Received Date: 2025-11-20
Accepted Date: 2026-01-12
Rev Recd Date: 2026-01-16

Available Online: 2026-01-29

Abstract

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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References(21)

References

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