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DGS based miniaturized wideband MIMO antenna with efficient isolation for C band applications

  • Praveen Kumar EMAIL logo , Rashmi Sinha , Arvind Choubey and Santosh Kumar Mahto
Published/Copyright: July 20, 2022
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Frequenz
From the journal Frequenz Volume 77 Issue 3-4

Abstract

A wideband multiple-input multiple-output (MIMO) antenna for C-band applications is presented in this paper. It consists of 2  ×  1 hexagonal motifs which serves as radiating elements. The side of each hexagonal element is 5.73 mm and the overall dimension of the proposed MIMO antenna is 30  ×  20  ×  1.6 mm3. The hexagonal motifs are embedded on inexpensive FR-4 lossy substrate. Thereafter, a circle with radius 1 mm is etched at the center of each hexagonal motif. Inverted L-shaped stubs are employed to attain efficient isolation between the nearby antenna elements. Four inverted L-shaped stubs are included to further enhance the isolation and eliminate the antenna size increment simultaneously, by suppressing the surface waves. Before using the decoupling approach, the MIMO antenna had an impedance bandwidth of 6.7 GHz and an isolation of −20 dB. The suggested antenna’s impedance bandwidth and isolation are 5.83 GHz and −52 dB, respectively, after using a decoupling approach (inverted L-shaped stub). The proposed MIMO antenna had a peak gain and radiation efficiency of 3–7 dBi and better than 90% (with decoupling), 2.75 to 6 dBi and greater than 60% (without decoupling). To verify the proposed design, a prototype was developed to compare the simulated parameters with the measured one. The envelope correlation coefficient (ECC) was less than 0.05, and channel capacity loss (CCL) less than 0.3 was achieved with DGS. Besides, scattering matrix such as return loss S 11 and transmission coefficient S 21 between two elements, radiation pattern, and current distribution was also favorable. Thus, the proposed MIMO antenna is advantageous to be used for C-band applications such as developing new generation air-borne and space-borne radars, as well as X-band applications.

Keywords: DGS; diversity gain; ECC; isolation enhancement; MIMO; mutual coupling
Corresponding author: Praveen Kumar, Department of Electronics & Communication Engineering, National Institute of Technology, Jamshedpur, 831014, India, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-02-09
Accepted: 2022-07-04
Published Online: 2022-07-20
Published in Print: 2023-04-25

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/freq-2022-0029
Keywords for this article
DGS; diversity gain; ECC; isolation enhancement; MIMO; mutual coupling

Articles in the same Issue

  1. Frontmatter
  2. Research Articles
  3. Addressing nonlinear İmpairments in fiber optic communication system utilizing novel modulation schemes
  4. Comparison of cross couple MOS based and Schottky diode based RF energy harvesting circuits using Wilkinson power combiner
  5. A balanced tri-band BPF with high selectivity based on ASSLR
  6. A novel miniaturized V-shaped monopole antenna for GSM/WiMAX/WLAN applications
  7. DGS based miniaturized wideband MIMO antenna with efficient isolation for C band applications
  8. A compact quad element MIMO antenna for LTE/5G (sub-6 GHz) applications
  9. Spiritual leaf shape compact MIMO patch antenna for 5G lower sub-6 GHz applications
  10. Review Article
  11. A miniaturized quad band hexagon patch antenna for GSM1800, C band and WiMAX applications
  12. Research Articles
  13. A circular monopole antenna with uniquely packed quad T-shaped strips for WLAN/WiMAX application
  14. Design and development of a graphene-based reconfigurable patch antenna array for THz applications
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