Rigorous Design of Compact High-Performance 3-D Microstrip Filters Using Inverse Scattering

In this letter, a novel design method for 3-D microstrip filters is proposed. The method is valid for any all-pole transfer function and employs an inverse scattering synthesis technique to generate a smooth characteristic impedance profile that is implemented by smoothly varying the substrate height and strip width. In this way, strongly enhanced characteristic impedance excursions can be implemented, allowing us to synthesize filters with very wide rejection bands and very compact physical dimensions. As an example of application, a Ku-band low-pass filter (LPF) with cut-off frequency of 11.8 GHz and rejection band up to 36 GHz is designed, featuring a length of 10.66 mm. The filter is fabricated through additive manufacturing (AM) and the measurements obtained confirm its excellent performance.

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Publication Details

Journal
IEEE Microwave and Wireless Technology Letters
Published
2025-09-12
DOI
https://doi.org/10.1109/lmwt.2025.3605549
Primary Topic
Microwave Engineering and Waveguides
Type
article
Field-Weighted Citation Impact
0.00

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article

Rigorous Design of Compact High-Performance 3-D Microstrip Filters Using Inverse Scattering

Alejandro Pons-Abenza, Petronilo Martín-Iglesias, M. A. G. Laso, Aurélien Perigaud et al.
IEEE Microwave and Wireless Technology Letters
Microwave Engineering and Waveguides
article

Rigorous Design of Compact High-Performance 3-D Microstrip Filters Using Inverse Scattering

Alejandro Pons-Abenza, Petronilo Martín-Iglesias, M. A. G. Laso, Aurélien Perigaud, Iván Arregui, Sharif Ahmad, T. Lopetegi, Germán A. Álvarez-Botero, Nicolas Delhote
article en

Abstract

In this letter, a novel design method for 3-D microstrip filters is proposed. The method is valid for any all-pole transfer function and employs an inverse scattering synthesis technique to generate a smooth characteristic impedance profile that is implemented by smoothly varying the substrate height and strip width. In this way, strongly enhanced characteristic impedance excursions can be implemented, allowing us to synthesize filters with very wide rejection bands and very compact physical dimensions. As an example of application, a Ku-band low-pass filter (LPF) with cut-off frequency of 11.8 GHz and rejection band up to 36 GHz is designed, featuring a length of 10.66 mm. The filter is fabricated through additive manufacturing (AM) and the measurements obtained confirm its excellent performance.

IEEE Microwave and Wireless Technology LettersVol. 35(12)
Centre National de la Recherche Scientifique (FR), Universidad Pública de Navarra (UPNA) (ES), University of Balochistan (PK), XLIM (FR), European Space Research and Technology Centre (NL), Université de Limoges (FR)
Ministerio de Ciencia e Innovación, Universidad Pública de Navarra, Agencia Estatal de Investigación
Openalex Percentile: Top 61%
Microwave Engineering and Waveguides
DOIOpen Access PDFOpenAlex
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