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<p>The rapid development of wireless communication towards technology demands compact, high isolation for MIMO antennas to obtain enhanced link reliability. Existing antenna design faces various challenges like mutual coupling, low isolation and gain. A compact quad port MIMO antenna is designed for upper mid-band 6G application, and it is experimentally validated. The novelty of the design lies in the integrated use of diamond-shaped slots for dual-band excitation, L-shaped decoupling stubs loaded with chip resistors for mutual coupling suppression. To mitigate surface wave effects, a cross-shaped defected ground structure (Cr-DGS) is used, and antenna parameters are optimized by using the enhanced fire hawk optimization (EFHO) algorithm. The antenna is designed with dimensions of height, width, and thickness <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({ 50}{\text{.8}} \times {50}{\text{.8}} \times {1}{\text{.6mm}}^{{3}}\)</EquationSource> </InlineEquation>. The proposed antenna operates at 17.81&#xa0;GHz and 19.40&#xa0;GHz, attaining peak gains of 6.3&#xa0;dB as well as 9.3&#xa0;dB, radiation efficiency of 98.4% and isolation values of less than -51&#xa0;dB without increasing structural complexity. The envelop correlation coefficient (ECC) remains below 0.02, with a near-ideal diversity gain of 9.98&#xa0;dB as well as low channel capacity loss (CCL) of less than 0.4 bits/s/Hz. These results confirm the excellent MIMO diversity performances. Measured outcomes demonstrate strong agreement with simulations, demonstrating the suitability of the proposed design for next-generation 6G wireless systems.</p>

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Enhanced Isolation Quad-Port MIMO Antenna Using Chip Resistors and Cross-Shaped Element for 6G Upper-mid Band Applications

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Nagarjuna Tanikonda,
  • Praveen B. Choppala,
  • Sudhamani Chilakala

摘要

The rapid development of wireless communication towards technology demands compact, high isolation for MIMO antennas to obtain enhanced link reliability. Existing antenna design faces various challenges like mutual coupling, low isolation and gain. A compact quad port MIMO antenna is designed for upper mid-band 6G application, and it is experimentally validated. The novelty of the design lies in the integrated use of diamond-shaped slots for dual-band excitation, L-shaped decoupling stubs loaded with chip resistors for mutual coupling suppression. To mitigate surface wave effects, a cross-shaped defected ground structure (Cr-DGS) is used, and antenna parameters are optimized by using the enhanced fire hawk optimization (EFHO) algorithm. The antenna is designed with dimensions of height, width, and thickness \({ 50}{\text{.8}} \times {50}{\text{.8}} \times {1}{\text{.6mm}}^{{3}}\) . The proposed antenna operates at 17.81 GHz and 19.40 GHz, attaining peak gains of 6.3 dB as well as 9.3 dB, radiation efficiency of 98.4% and isolation values of less than -51 dB without increasing structural complexity. The envelop correlation coefficient (ECC) remains below 0.02, with a near-ideal diversity gain of 9.98 dB as well as low channel capacity loss (CCL) of less than 0.4 bits/s/Hz. These results confirm the excellent MIMO diversity performances. Measured outcomes demonstrate strong agreement with simulations, demonstrating the suitability of the proposed design for next-generation 6G wireless systems.