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W-band Dual-band Filter and Diplexer Based on Mixed TE301- and TE102-Mode Cavities

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Abstract

In this article, waveguide dual-band filter and diplexer working on W-band are synthesized through cascading mixed TE301- and TE102-mode cavities as well as TE101-mode resonators. Based on the discussion of top resonance modes in single cavity, the TE301&TE102 dual-mode resonator which features oversized dimension, technological insensitivity and high Q-factor is the strong candidate for designing high-frequency filters and diplexers. For dual-band filter, such dual-mode resonator can be shared by both bands as T-junction, and each band can be independently controlled. Besides, a W-band diplexer is proposed based on the analogous method. Two extra zeros have also been generated for each channel with adopting the singlet concept. Finally, the filter and diplexer prototypes are machined by CNC-milling. The filter has obtained 3-dB FBWs of 4% (86.7–90.2 GHz) and 6.3% (96.7–103 GHz), low insertion losses (ILs) of -0.9 dB and -0.5 dB, as well as less than -16 dB return loss, respectively. The diplexer has achieved 3-dB FBWs of 4.9% (86.3–90.6 GHz) and 6.5% (96.9–103.4 GHz), low ILs of -0.7 dB and -0.4 dB, high insolation with more than 40 dB, respectively. All the experimental results including transmission zeros on out-of-band are very close to the simulations in the full band. The performance of dual-band filter and diplexer is highlighted comparing with the reported ones too.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

1. National Natural Science Foundation of China under Grant 12003011.

2. State Key Laboratory of Millimeter Waves Open Research Program under Grant K202417.

Author information

Authors and Affiliations

  1. School of Electronic & Information Engineering, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nan**g University of Information Science and Technology, Nan**g, 210044, People’s Republic of China

    Jiang-Qiao Ding, Rong-Huai Nie & Yun Zhao

  2. State Key Laboratory of Millimeter Waves, Southeast University, Nan**g, 210096, China

    Jiang-Qiao Ding

  3. Microsystem and Terahertz Research Center, China Academy of Engineering Physics, Chengdu, 610299, China

    Rong-Huai Nie, Jun Jiang & Kun Huang

  4. Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang, 621900, China

    Rong-Huai Nie, Jun Jiang & Kun Huang

  5. National Key Laboratory of Science and Technology On Space Microwave, China Academy of Space Technology, **’an, 710100, People’s Republic of China

    Sheng Li

Authors
  1. Jiang-Qiao Ding
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Contributions

Jiang-Qiao Ding: Funding acquisition, Investigation, Project administration, Writing-original draft, Rong-Huai Nie: Investigation, Methodology, Software, Writing-original draft, Yun Zhao: Conceptualization, Data curation, Formal analysis, Jun Jiang: Supervision, Validation, Visualization, Kun Huang: Supervision, Validation, Visualization, Sheng Li: Funding acquisition, Project administration, Supervision.

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Correspondence to Jiang-Qiao Ding.

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Ding, JQ., Nie, RH., Zhao, Y. et al. W-band Dual-band Filter and Diplexer Based on Mixed TE301- and TE102-Mode Cavities. J Infrared Milli Terahz Waves 45, 556–573 (2024). https://doi.org/10.1007/s10762-024-00989-8

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