Compact Quad-Port MIMO Antenna with Intrinsic Self-Decoupling and High Isolation for ISM/WLAN at 2.45 GHz
Younis F. Jabire A.H. Ahmad J. El Ansari A. Luo H. Wang S.
February 2026Springer
Journal of Electronic Materials
2026#55Issue 22419 - 2433 pp.
Mutual coupling between closely spaced elements in a multiple-input multiple-output (MIMO) antenna critically impacts performance. Accordingly, suppression of mutual coupling and enhancement of isolation rely on effective decoupling mechanisms. This work presents a 4 × 4 self-decoupled MIMO antenna employing a stub-loaded structure with elements placed orthogonally at 8.2 mm horizontal and 5.6 mm vertical spacing. The optimized antenna exhibits high isolation, ranging from −27 dB to > −37 dB, achieved through inherent self-decoupling without additional decoupling techniques. The antenna demonstrates excellent performance metrics, including a peak gain of 6.07 dBi, envelope correlation coefficient (ECC) < 0.02, diversity gain (DG) > 9.9, channel capacity loss (CCL) < 0.02, total active reflection coefficient < −10 dB, and radiation efficiency of 87%. The design is validated on a three-layer human tissue model confirming that the specific absorption rate (SAR) remains within standard safety limits. Fabricated prototype measurements closely match simulations, confirming the antenna’s suitability for compact biomedical wireless devices operating in the industrial, scientific, and medical (ISM) and wireless local area network (WLAN) bands.
ISM band , isolation , MIMO antenna , self-decoupling , WLAN applications
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School of Physics, Central South University, Changsha, 410083, China
Taraba State University, Jalingo, 660213, Nigeria
Department of Electrical and Computer Engineering, School of Engineering and Digital Science, Nazarbayev University, Astana, 010000, Kazakhstan
Signal, System and Component Laboratory, Sidi Mohamed Ben Abdellah University – FST, Fez, Morocco
School of Electronics Information, Central South University, Changsha, 410083, China
School of Physics
Taraba State University
Department of Electrical and Computer Engineering
Signal
School of Electronics Information
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Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026