Miniaturization and Transition Sharpening of Plasmonic Filters via Interdigital Capacitors.

Saved in:

Bibliographic Details
Title:	Miniaturization and Transition Sharpening of Plasmonic Filters via Interdigital Capacitors.
Authors:	Xu, Yangqing¹, Zhang, Qingcheng¹, Guo, Ruijie¹, Fan, Yuyu¹, He, Yan¹, Li, Lin¹ lilin_door@hotmail.com
Source:	Progress in Electromagnetics Research C. 2026, Vol. 169, p132-137. 6p.
Subjects:	Coplanar waveguides, Capacitors, Applied sciences, Plasmonics, Polaritons, Frequency response
Abstract:	This paper proposes a spoof surface plasmon polariton (SSPP) based on a coplanar waveguide (CPW) with an interdigital structure, aiming to realize a plasmonic filter with both miniaturization and sharp transition characteristics. Dispersion and transition analyses demonstrate that the proposed unit exhibits flexibly controllable dispersion and transition features by tuning the geometrical parameters of the interdigital unit. Based on this, a compact filter with the proposed structure was designed, simulated, and experimentally validated. The introduction of the interdigital slot structure provides an additional degree of freedom for tuning, enabling the filter to achieve a steep transition from the passband to the stopband (with a roll-off rate of up to 181.31 dB/GHz) while maintaining a compact size. The measured results are in good agreement with the simulated ones, which verifies the effectiveness of the proposed design. In addition, the bandpass response introduced by higher-order modes offers a feasible route toward the multimode and multifunction integration of filters. [ABSTRACT FROM AUTHOR]
	Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Engineering Source

Description
Abstract:	This paper proposes a spoof surface plasmon polariton (SSPP) based on a coplanar waveguide (CPW) with an interdigital structure, aiming to realize a plasmonic filter with both miniaturization and sharp transition characteristics. Dispersion and transition analyses demonstrate that the proposed unit exhibits flexibly controllable dispersion and transition features by tuning the geometrical parameters of the interdigital unit. Based on this, a compact filter with the proposed structure was designed, simulated, and experimentally validated. The introduction of the interdigital slot structure provides an additional degree of freedom for tuning, enabling the filter to achieve a steep transition from the passband to the stopband (with a roll-off rate of up to 181.31 dB/GHz) while maintaining a compact size. The measured results are in good agreement with the simulated ones, which verifies the effectiveness of the proposed design. In addition, the bandpass response introduced by higher-order modes offers a feasible route toward the multimode and multifunction integration of filters. [ABSTRACT FROM AUTHOR]
ISSN:	19378718
DOI:	10.2528/PIERC26020807