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<p>This work introduces a compact four-element Trident-Type Slotted Monopole (TTSM) MIMO antenna developed for millimeter-wave super ultra-wideband (SUWB) communication systems. The antenna is realized on a Rogers RT/Duroid 5880 substrate and utilizes an orthogonal arrangement of radiating elements combined with a shared ground plane, where the interelement spacing is optimized to 8.5&#xa0;mm to maintain compact dimensions of 24 × 24 × 0.787 mm<sup>3</sup>, while controlling coupling between ports. To reduce mutual coupling further, decoupling structures in the form of SRRs are placed between each element. The optimized SRR-2 configuration integrated with grounded stubs forms an effective isolation network that restrains surface current propagation and reduces coupling while preserving stable radiation behavior. The developed antenna exhibits a broad operating bandwidth from 20.10 to 49.55&#xa0;GHz (|S₁₁|&lt; -10&#xa0;dB), along with inter-port isolation greater than 25&#xa0;dB and peak isolation close to 30&#xa0;dB. Radiation efficiency is greater than 94%, and peak gain is 11 dBi; also, the design has an extremely low ECC value of 0.008, which implies high diversity performance for the design. The experimental results were consistent with the simulation data, as expected. The combined use of the TTSM radiator, common ground structure, and SRR-2 decoupling network enables simultaneous improvement in bandwidth, isolation, and gain without enlarging the antenna footprint, making the design well suited for next-generation mm-wave SUWB wireless platforms.</p>

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Novel Super-Wideband Four-Element MIMO Antenna Using SRR based Decoupling Structures and Grounded Stubs for High-Isolation Advanced 5G mm-Wave Communication

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Manumula Srinubabu,
  • Nainavarapu Radha,
  • Nuthakki Venkata Rajasekhar,
  • Bujjibabu Penumutchi,
  • Vivek Rajpoot,
  • Ramesh A.,
  • D. Kishore,
  • Sanjeev Kumar

摘要

This work introduces a compact four-element Trident-Type Slotted Monopole (TTSM) MIMO antenna developed for millimeter-wave super ultra-wideband (SUWB) communication systems. The antenna is realized on a Rogers RT/Duroid 5880 substrate and utilizes an orthogonal arrangement of radiating elements combined with a shared ground plane, where the interelement spacing is optimized to 8.5 mm to maintain compact dimensions of 24 × 24 × 0.787 mm3, while controlling coupling between ports. To reduce mutual coupling further, decoupling structures in the form of SRRs are placed between each element. The optimized SRR-2 configuration integrated with grounded stubs forms an effective isolation network that restrains surface current propagation and reduces coupling while preserving stable radiation behavior. The developed antenna exhibits a broad operating bandwidth from 20.10 to 49.55 GHz (|S₁₁|< -10 dB), along with inter-port isolation greater than 25 dB and peak isolation close to 30 dB. Radiation efficiency is greater than 94%, and peak gain is 11 dBi; also, the design has an extremely low ECC value of 0.008, which implies high diversity performance for the design. The experimental results were consistent with the simulation data, as expected. The combined use of the TTSM radiator, common ground structure, and SRR-2 decoupling network enables simultaneous improvement in bandwidth, isolation, and gain without enlarging the antenna footprint, making the design well suited for next-generation mm-wave SUWB wireless platforms.