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<p>This communication presents a wearable twin-band twin-port radiator based on a polyimide substrate. The antenna’s total dimension is 48 × 80 mm<sup>2</sup>. Two ports are arranged in a side-by-side manner so that space diversity comes into the play and enhances the port isolation value by more than 30&#xa0;dB. A metamaterial-built absorber surface is located behind the dual-port radiator. This absorber reduces the SAR value (for 1-g and 10-g human cells) to more than 90% as well as boosts the antenna’s gain to 5.95/3.5 dBi. Additionally, it has been indicated that the bending of&#xa0;the antenna&#xa0;does not influence its operation, making it ideal for on-body monitoring. Experimental verification confirms that the designed aerial works in two operating regimes, i.e., 2.2–2.75&#xa0;GHz and 3.35–4.1&#xa0;GHz. Directive radiation features and a low value of ECC confirm its applicability for WBAN applications (2.5&#xa0;GHz/3.3&#xa0;GHz).</p>

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Dual-Band Metamaterial Absorber-Loaded Wearable MIMO Antenna with Low SAR and High Isolation

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Dheeraj Nagar,
  • Prashant Ranjan,
  • Atanu Chowdhury

摘要

This communication presents a wearable twin-band twin-port radiator based on a polyimide substrate. The antenna’s total dimension is 48 × 80 mm2. Two ports are arranged in a side-by-side manner so that space diversity comes into the play and enhances the port isolation value by more than 30 dB. A metamaterial-built absorber surface is located behind the dual-port radiator. This absorber reduces the SAR value (for 1-g and 10-g human cells) to more than 90% as well as boosts the antenna’s gain to 5.95/3.5 dBi. Additionally, it has been indicated that the bending of the antenna does not influence its operation, making it ideal for on-body monitoring. Experimental verification confirms that the designed aerial works in two operating regimes, i.e., 2.2–2.75 GHz and 3.35–4.1 GHz. Directive radiation features and a low value of ECC confirm its applicability for WBAN applications (2.5 GHz/3.3 GHz).