Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance Method
This article presents a symmetrical reduced-size eight-element MIMO antenna array with high electromagnetic isolation among radiators. The array utilizes easy-to-build techniques to cover the n77 and n78 new radio (NR) bands. It is based on an octagonal double-negative metamaterial split-ring resona...
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MDPI AG
2024-09-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/24/19/6266 |
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| author | Tirado-Mendez Jose Alfredo Jardon-Aguilar Hildeberto Flores-Leal Ruben Rangel-Merino Arturo Perez-Miguel Angel Gomez-Villanueva Ricardo |
| author_facet | Tirado-Mendez Jose Alfredo Jardon-Aguilar Hildeberto Flores-Leal Ruben Rangel-Merino Arturo Perez-Miguel Angel Gomez-Villanueva Ricardo |
| author_sort | Tirado-Mendez Jose Alfredo |
| collection | DOAJ |
| description | This article presents a symmetrical reduced-size eight-element MIMO antenna array with high electromagnetic isolation among radiators. The array utilizes easy-to-build techniques to cover the n77 and n78 new radio (NR) bands. It is based on an octagonal double-negative metamaterial split-ring resonator (SRR), which enables a size reduction of over 50% for the radiators compared to a conventional disc monopole antenna by increasing the slow-wave factor. Additionally, due to the extreme proximity between the radiating elements in the array, the modal significance (<i>MS</i>) method was employed to identify which propagation modes had the most impact on the electromagnetic coupling among elements. This approach aimed to mitigate their effect by using an electromagnetic barrier, thereby enhancing electromagnetic isolation. The electromagnetic barriers, implemented with strip lines, achieved isolation values exceeding 20 dB for adjacent elements (<0.023 λ) and approaching 40 dB for opposite ones (<0.23 λ) after analyzing the surface current distribution by the <i>MS</i> method. The elements are arranged in axial symmetry, forming an octagon with each antenna port located on a side. The array occupies an area of 0.32 λ<sup>2</sup> at 3.5 GHz, significantly smaller than previously published works. It exhibits excellent performance for MIMO applications, demonstrating an envelope correlation coefficient (<i>ECC</i>) below 0.0001, a total active reflection coefficient (<i>TARC</i>) lower than −10 dB for various incoming signals with random phases, and a diversity gain (<i>DG</i>) close to 20 dB. |
| format | Article |
| id | doaj-art-902d35ac92124c8d8553985c74db2b10 |
| institution | OA Journals |
| issn | 1424-8220 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj-art-902d35ac92124c8d8553985c74db2b102025-08-20T01:47:34ZengMDPI AGSensors1424-82202024-09-012419626610.3390/s24196266Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance MethodTirado-Mendez Jose Alfredo0Jardon-Aguilar Hildeberto1Flores-Leal Ruben2Rangel-Merino Arturo3Perez-Miguel Angel4Gomez-Villanueva Ricardo5Instituto Politécnico Nacional, Electrical Engineering Department, SEPI-ESIME-Zacatenco, Av. IPN S/N, Edif. 5., Ciudad de México 07300, MexicoCINVESTAV-IPN, Telecommunications Section, Av. IPN 2508, San Pedro Zacatenco, Ciudad de México 07360, MexicoCINVESTAV-IPN, Telecommunications Section, Av. IPN 2508, San Pedro Zacatenco, Ciudad de México 07360, MexicoInstituto Politécnico Nacional, Electrical Engineering Department, SEPI-ESIME-Zacatenco, Av. IPN S/N, Edif. 5., Ciudad de México 07300, MexicoCINVESTAV-IPN, Telecommunications Section, Av. IPN 2508, San Pedro Zacatenco, Ciudad de México 07360, MexicoCINVESTAV-IPN, Telecommunications Section, Av. IPN 2508, San Pedro Zacatenco, Ciudad de México 07360, MexicoThis article presents a symmetrical reduced-size eight-element MIMO antenna array with high electromagnetic isolation among radiators. The array utilizes easy-to-build techniques to cover the n77 and n78 new radio (NR) bands. It is based on an octagonal double-negative metamaterial split-ring resonator (SRR), which enables a size reduction of over 50% for the radiators compared to a conventional disc monopole antenna by increasing the slow-wave factor. Additionally, due to the extreme proximity between the radiating elements in the array, the modal significance (<i>MS</i>) method was employed to identify which propagation modes had the most impact on the electromagnetic coupling among elements. This approach aimed to mitigate their effect by using an electromagnetic barrier, thereby enhancing electromagnetic isolation. The electromagnetic barriers, implemented with strip lines, achieved isolation values exceeding 20 dB for adjacent elements (<0.023 λ) and approaching 40 dB for opposite ones (<0.23 λ) after analyzing the surface current distribution by the <i>MS</i> method. The elements are arranged in axial symmetry, forming an octagon with each antenna port located on a side. The array occupies an area of 0.32 λ<sup>2</sup> at 3.5 GHz, significantly smaller than previously published works. It exhibits excellent performance for MIMO applications, demonstrating an envelope correlation coefficient (<i>ECC</i>) below 0.0001, a total active reflection coefficient (<i>TARC</i>) lower than −10 dB for various incoming signals with random phases, and a diversity gain (<i>DG</i>) close to 20 dB.https://www.mdpi.com/1424-8220/24/19/6266MIMO antennametamaterial8-elementssmall sizeoctagonal SRR |
| spellingShingle | Tirado-Mendez Jose Alfredo Jardon-Aguilar Hildeberto Flores-Leal Ruben Rangel-Merino Arturo Perez-Miguel Angel Gomez-Villanueva Ricardo Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance Method Sensors MIMO antenna metamaterial 8-elements small size octagonal SRR |
| title | Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance Method |
| title_full | Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance Method |
| title_fullStr | Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance Method |
| title_full_unstemmed | Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance Method |
| title_short | Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance Method |
| title_sort | small size eight element mimo metamaterial antenna with high isolation using modal significance method |
| topic | MIMO antenna metamaterial 8-elements small size octagonal SRR |
| url | https://www.mdpi.com/1424-8220/24/19/6266 |
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