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Low Coupling Miniaturized MIMO Antenna for Quad Band Application

International Journal of Electronics and Communication Engineering
© 2025 by SSRG - IJECE Journal
Volume 12 Issue 2
Year of Publication : 2025
Authors : Ravindra S. Bakale, Anil B. Nandgaonkar, Mahesh Munde, Digambar Puri
10.14445/23488549/IJECE-V12I2P104
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How to Cite?

Ravindra S. Bakale, Anil B. Nandgaonkar, Mahesh Munde, Digambar Puri, "Low Coupling Miniaturized MIMO Antenna for Quad Band Application," SSRG International Journal of Electronics and Communication Engineering, vol. 12,  no. 2, pp. 38-53, 2025. Crossref, https://doi.org/10.14445/23488549/IJECE-V12I2P104

Abstract:

Researchers have recently focused on designing compact MIMO antenna systems for wireless communication with ultra-wideband-however, miniaturization results in weak isolation between antenna elements. Therefore, several isolation enhancement techniques, such as slits, elliptical slots, EBG structure, neutralization lines, decoupling structures, stubs, DGS, and SRR are applied. A compact multi-band and low-coupling antenna is proposed for short-range wireless communication. The design comprises two symmetrical monopole antennae with T-shape stubs to improve the isolation > 18 dB over the 3.1-12GHz. The dimensions of the antenna are 44 x 20 x 1.53 mm3. The quad-band (S11< -10 dB) at 3.25-3.85GHz, 5.10-5.65GHz, 8.60-8.90GHz, and 9.55-11.80GHz is achieved with a mutual coupling (S21) of -22.0dB, -21.36dB, -35dB, and -18dB respectively. The antenna provides effective coverage of four frequency bands with low electromagnetic interference. The antenna with high bandwidth is available for high-frequency applications in the X band. A finite element method solver such as Ansys High-Frequency Structure Simulator (HFSS) software for the design of recommended antennae is preferred. The fabricated antenna was tested using a vector network analyzer to measure S parameters such as S11, S21, and VSWR. The envelope correlation coefficient < .0001, DG > 9.90 dB, CCL < 0.0005 bps/Hz, and TARC <-10dB is obtained over the working bandwidth of the antenna. The actual and measured outcomes approximately match, with a slight deviation due to fabrication, copper, and conductor loss. Therefore, the recommended antenna is the ultimate candidate for multi-band application.

Keywords:

Diversity gain, Envelope Correlation Coefficient (ECC), MIMO, Mutual coupling, Total active reflection coefficients.

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