Design Compact Dual Band EMSIW MIMO Antenna with Improved Higher-Order Mode Radiation Pattern

Articles in Press

Document Type : Research Article

Authors

Department of ECE, Malviya National Institute of Technology, Jaipur, India

10.24200/sci.2025.66423.10193

Abstract

In this paper, a compact dual-band eight-mode substrate-integrated waveguide (EMSIW) MIMO (Multiple-Input Multiple-Output) antenna is presented for S and C band applications. By utilizing the EMSIW approach, the electrical size of the antenna is reduced to 1/8th of a conventional square SIW cavity resonator. The eight-mode configuration preserves the dominant mode at the same frequency, while significantly reducing the antenna size. The dominant mode resonates at 2.5 GHz, and a higher-order mode operates at 5.8 GHz by incorporating a slot in the design. To improve the radiation pattern at 5.8 GHz, the surface current nulls near the center of the EMSIW patch are reshaped, enhancing broadside radiation. The 2x2 MIMO antenna is designed to minimize mutual coupling by maintaining specific electric and magnetic wall configurations, ensuring minimal electric field interaction between the antenna ports. Fabricated on a low-cost FR4 substrate, the proposed MIMO antenna demonstrates excellent agreement between simulated and measured results. This compact design is a promising solution for satellite S-band and C-band applications, offering enhanced higher-order mode radiation performance and minimal mutual coupling.

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Main Subjects

Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 20 December 2025

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History

  • Receive Date: 30 April 2025
  • Revise Date: 13 August 2025
  • Accept Date: 28 September 2025

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