Development of Multi-Band Sub-6 GHz MIMO Antenna Using Complementary Split Ring Resonator and Defected Ground Structure

Basavaraju D R; Sukumar Ramanujam

doi:https://doi.org/10.14445/22315381/IJETT-V73I11P122

Research Article | Open Access | Download PDF

Volume 73 | Issue 11 | Year 2025 | Article Id. IJETT-V73I11P122 | DOI : https://doi.org/10.14445/22315381/IJETT-V73I11P122

Development of Multi-Band Sub-6 GHz MIMO Antenna Using Complementary Split Ring Resonator and Defected Ground Structure

Basavaraju D R, Sukumar Ramanujam

Received	Revised	Accepted	Published
08 Aug 2025	05 Nov 2025	15 Nov 2025	25 Nov 2025

Citation :

Basavaraju D R, Sukumar Ramanujam, "Development of Multi-Band Sub-6 GHz MIMO Antenna Using Complementary Split Ring Resonator and Defected Ground Structure," International Journal of Engineering Trends and Technology (IJETT), vol. 73, no. 11, pp. 312-324, 2025. Crossref, https://doi.org/10.14445/22315381/IJETT-V73I11P122

Abstract

This study presents a multi-band, two-port MIMO antenna incorporating a Complementary Split Ring Resonator (CSRR) on the radiating patch and an inverted-L shaped slot on the ground plane. The design is tailored to support WiMAX, 5GHz Wi-Fi, and Advanced 5G Applications. The proposed MIMO antenna works at three frequency bands centered at 3.6 GHz, 4.47 GHz, and 5.53 GHz. The optimized circular CSRR with diagonal splits introduced on the radiating patch yields one more resonance frequency band by converting a wideband to a dual-band antenna. The Square loop structured strip line, Coplanar Waveguide (CPW) feed, improves the bandwidth and impedance matching. An inverted-L-shaped slot on the ground plane generates a multi-band characteristic by introducing one more band from 5.16 GHz to 7 GHz. The designed antenna has a dimension of 63 x 20 x 1.6 mm3. The FR4 substrate with a dielectric constant of 4.4, a thickness of 1.6 mm, was used for the simulation as well as fabrication. The implemented antenna is examined with MIMO performance parameters, and simulated and measured quantities are in good agreement. The Simulated results of S21 less than -24dB, ECC<0.0035, DG>9.999 dB, TARC less than -10dB, and CCL < 0.175 bits/sec/Hz for all three bands were obtained. The overall gain of the MIMO was found to be 3.1dBi. The analysis shows that the incorporation of CSRR resulted in a dual-band with slightly improved gain, and the CPW feed improves the gain as well as the bandwidth. The defective ground structure (inverted-L -L shape) leads to the multi-band characteristic. The antenna was fabricated, and its performance was tested with a Vector Network Analyzer (VNA). The results signify that the implemented antenna is a potential candidate for applications in the 5G Sub-6 GHz Band.

Keywords

MIMO, CSRR, DGS, Sub-6 GHz.

References

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