Compact octagonal MIMO antenna system for broadband applications with enhanced isolation and wideband performance
Abstract This work introduces a compact and novel MIMO antenna system with close spacing and exceptional isolation, tailored for broadband usage across frequencies from 3.7 to 11 GHz. The antenna configuration consists of two octagonal radiators, each individually powered by a 50 Ω microstrip line....
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-05-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-03494-7 |
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| author | R. Dhananjeyan S. Ramesh D. Rajesh Kumar Om Prakash Kumar |
| author_facet | R. Dhananjeyan S. Ramesh D. Rajesh Kumar Om Prakash Kumar |
| author_sort | R. Dhananjeyan |
| collection | DOAJ |
| description | Abstract This work introduces a compact and novel MIMO antenna system with close spacing and exceptional isolation, tailored for broadband usage across frequencies from 3.7 to 11 GHz. The antenna configuration consists of two octagonal radiators, each individually powered by a 50 Ω microstrip line. The use of a modified ground structure ensures a wideband frequency range. A key novelty of this design is the incorporation of a strategically placed stub (25.6875 × 0.5 mm2) between the radiating sections, which significantly enhances inter-port isolation, achieving over 15 dB despite the minimal 3 mm port separation—an improvement over conventional MIMO antennas. This design enables high isolation without increasing antenna size, making it highly efficient for compact wireless systems. Performance evaluation, including fabrication and testing, demonstrates a strong alignment between simulation and experimental data. Metrics such as envelope correlation coefficient (ECC), diversity gain (DG), and channel capacity loss (CCL) were analyzed to assess MIMO efficiency. The proposed antenna is ideal for broadband wireless systems with a peak gain of 6.5 dBi and excellent resonance, offering superior isolation and compactness compared to existing designs. |
| format | Article |
| id | doaj-art-109dcc95ae034edd8a09fb76b5fbeb8e |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-109dcc95ae034edd8a09fb76b5fbeb8e2025-08-20T02:00:12ZengNature PortfolioScientific Reports2045-23222025-05-0115111310.1038/s41598-025-03494-7Compact octagonal MIMO antenna system for broadband applications with enhanced isolation and wideband performanceR. Dhananjeyan0S. Ramesh1D. Rajesh Kumar2Om Prakash Kumar3Department of Electronics and Communication Engineering, SRM Valliammai Engineering CollegeDepartment of Electronics and Communication Engineering, SRM Valliammai Engineering College Department of Electronics and Communication Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and TechnologyDepartment of Electronics and Communication Engineering, Manipal Institute of Technology, Manipal Academy of Higher EducationAbstract This work introduces a compact and novel MIMO antenna system with close spacing and exceptional isolation, tailored for broadband usage across frequencies from 3.7 to 11 GHz. The antenna configuration consists of two octagonal radiators, each individually powered by a 50 Ω microstrip line. The use of a modified ground structure ensures a wideband frequency range. A key novelty of this design is the incorporation of a strategically placed stub (25.6875 × 0.5 mm2) between the radiating sections, which significantly enhances inter-port isolation, achieving over 15 dB despite the minimal 3 mm port separation—an improvement over conventional MIMO antennas. This design enables high isolation without increasing antenna size, making it highly efficient for compact wireless systems. Performance evaluation, including fabrication and testing, demonstrates a strong alignment between simulation and experimental data. Metrics such as envelope correlation coefficient (ECC), diversity gain (DG), and channel capacity loss (CCL) were analyzed to assess MIMO efficiency. The proposed antenna is ideal for broadband wireless systems with a peak gain of 6.5 dBi and excellent resonance, offering superior isolation and compactness compared to existing designs.https://doi.org/10.1038/s41598-025-03494-7MIMOCurrent limiting stubECCCCLDGSdg 9: industry, innovation, and infrastructure |
| spellingShingle | R. Dhananjeyan S. Ramesh D. Rajesh Kumar Om Prakash Kumar Compact octagonal MIMO antenna system for broadband applications with enhanced isolation and wideband performance Scientific Reports MIMO Current limiting stub ECC CCL DG Sdg 9: industry, innovation, and infrastructure |
| title | Compact octagonal MIMO antenna system for broadband applications with enhanced isolation and wideband performance |
| title_full | Compact octagonal MIMO antenna system for broadband applications with enhanced isolation and wideband performance |
| title_fullStr | Compact octagonal MIMO antenna system for broadband applications with enhanced isolation and wideband performance |
| title_full_unstemmed | Compact octagonal MIMO antenna system for broadband applications with enhanced isolation and wideband performance |
| title_short | Compact octagonal MIMO antenna system for broadband applications with enhanced isolation and wideband performance |
| title_sort | compact octagonal mimo antenna system for broadband applications with enhanced isolation and wideband performance |
| topic | MIMO Current limiting stub ECC CCL DG Sdg 9: industry, innovation, and infrastructure |
| url | https://doi.org/10.1038/s41598-025-03494-7 |
| work_keys_str_mv | AT rdhananjeyan compactoctagonalmimoantennasystemforbroadbandapplicationswithenhancedisolationandwidebandperformance AT sramesh compactoctagonalmimoantennasystemforbroadbandapplicationswithenhancedisolationandwidebandperformance AT drajeshkumar compactoctagonalmimoantennasystemforbroadbandapplicationswithenhancedisolationandwidebandperformance AT omprakashkumar compactoctagonalmimoantennasystemforbroadbandapplicationswithenhancedisolationandwidebandperformance |