Groove Gap Waveguide Bandpass Filter Based on Spoof Surface Plasmon Polariton for Ka-Band Applications

In this article, spoof surface plasmon polariton (SSPP) is developed in a groove gap waveguide (GGW) to realize an adjustable bandpass filter for Ka -band applications. The proposed SSPP structure consists of a single row of corrugated metallic blocks, which is embedded into the groove of GGW. The l...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2024-01, Vol.72 (1), p.1-8
Main Authors: Li, Qinlong, Guo, Dapeng, Mou, Jinchao, Li, Jianxing, Xu, Kai-Da
Format: Article
Language:English
Subjects:
Band-pass filters
Bandpass filter
Bandpass filters
Cutoff frequency
Dispersion
Extremely high frequencies
Gap waveguide
groove gap waveguide (GGW)
Grooves
Insertion loss
low insertion loss
Metals
Microwave filters
millimeter-wave
Pins
Plasmons
Polaritons
spoof surface plasmon polariton (SSPP)
Unit cell
Waveguides
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Summary:In this article, spoof surface plasmon polariton (SSPP) is developed in a groove gap waveguide (GGW) to realize an adjustable bandpass filter for Ka -band applications. The proposed SSPP structure consists of a single row of corrugated metallic blocks, which is embedded into the groove of GGW. The lower cut-off frequency of the passband can be adjusted by changing the groove width or pin height, and the upper cut-off frequency of the passband is determined by the period or height of the SSPP unit cell through dispersion and S-parameter analysis. For demonstration, a GGW-SSPP bandpass filter is fabricated and measured based on the proposed method. The measured bandwidth is from 29.8 to 35.8 GHz, which is in agreement with that of the simulated one. The proposed GGW-SSPP filter can achieve adjustable bandpass characteristics with a low insertion loss of 0.22 dB owing to the application of GGW.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2023.3288630