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Open EMS Based Design of a CSRR Bandpass Filter for 5G: An Accessible Simulation Approach
Gauravkumar Asari
Abstract:   (90 Views)
With the rapid global rollout of 5G technology, the demand for compact, wideband, and low-loss bandpass filters (BPFs) has become more critical than ever. Among various RF filter configurations, complementary split ring resonator (CSRR) based BPFs offer significant advantages in terms of miniaturization, electromagnetic control, and metamaterial behavior. Their ability to achieve negative permittivity and negative permeability allows for engineered responses that are difficult to obtain with  conventional structures. This paper presents a metamaterial-inspired BPF design based on CSRR and Defected Ground Structures (DGS) for mid-band 5G applications. Three distinct layouts are proposed, each increasing in structural complexity and performance. These configurations incorporate single, double, and triple ring square CSRRs, along with stepped, and dumbbell-shaped DGS patterns for bandwidth and coupling enhancement. The electromagnetic characteristics are studied through return loss (Sā‚ā‚), insertion loss (Sā‚‚ā‚), parametric analysis, and NRW-based extraction of permittivity and permeability. Unlike conventional methods relying on expensive commercial solvers like HFSS, this work leverages an open-source simulation workflow using Open EMS and Python based parametric scripting, enabling cost-effective, reproducible, and transparent design validation. The proposed method not only confirms the metamaterial behavior of the structures but also demonstrates significant performance improvement in terms of bandwidth, insertion loss, and EM field distribution compared to baseline designs.
Keywords: Bandpass Filter, Complementary Split Ring Resonator, Defected Ground Structure, Scattering Parameters, Open EMS
Full-Text [PDF 2015 kb]   (37 Downloads)    
Type of Study: Research Paper | Subject: Microwave Passive Circuits
Received: 2025/11/28 | Revised: 2026/02/17 | Accepted: 2026/02/05
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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Creative Commons License
© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.