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Harnessing fano-like line shape resonance in a rectangular waveguide for filtering applications
El-Aouni Mimoun1, Ali Hennache2, Ben-Ali Youssef3
1Laboratory of Materials, Waves, Energy and Environment, Team of Waves, Acoustics, Photonics and Materials, Mohamed I University, Oujda, Morocco.
Scientific Reports
|March 7, 2026
Summary
This study details a tunable one-dimensional rectangular waveguide structure (1D-RWS) for radio-frequency applications. Geometric modifications allow precise control over transmission spectra, enabling versatile bandpass filter designs for communication systems.
Area of Science:
- Electromagnetics and Wave Propagation
- Applied Physics
- Microwave Engineering
Background:
- One-dimensional rectangular waveguide structures (1D-RWS) are fundamental components in radio-frequency (RF) systems.
- Controlling electromagnetic wave propagation and filtering characteristics is crucial for advanced communication systems.
- Existing designs often require complex fabrication or lack tunability.
Purpose of the Study:
- To investigate the transmission characteristics and filtering performance of a tailored 1D-RWS.
- To explore the influence of geometric parameters on the spectral response of the waveguide.
- To establish a design principle for tunable RF bandpass filters based on 1D-RWS.
Main Methods:
- Theoretical modeling using the Green's function method (GFM) to understand physical mechanisms.
- Numerical validation through rigorous finite element method (FEM) simulations.
- Systematic analysis of geometric parameters: resonator length, lateral position, and width.
Main Results:
- Demonstrated high tunability of transmission spectra and resonant frequencies.
- Observed phenomena including resonant frequency shifts, critical coupling, and bandwidth variations.
- Confirmed the 1D-RWS as a versatile platform for controlling electromagnetic wave propagation.
Conclusions:
- The proposed 1D-RWS offers a flexible platform for designing tunable bandpass filters in the RF spectrum.
- Geometric parameter control provides a method for achieving desired spectral responses.
- This research provides a design principle for integrated radio-wave circuits and communication systems.
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