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<p>Cognitive radio (CR) technology provides wireless access to emerging wearable and flexible bio sensing applications. Owing to the spectrum scarcity, the available frequencies in the UWB (Ultrawideband) can be assigned to other users via CR antenna. Designing antennas for such networks with conformal substrates is an interesting and innovative task. Existing conventional substrates such as FR4 based antenna often suffers from high return loss and standing waves due to high dielectric constant of about 4.4. The paper focuses on the novel polymer composite thin film preparation from polyvinyl alcohol (PVA) and Graphite. Dielectric constant of the thin film is measured as 2.27 and it is used in the simulation of elliptical wideband antenna. Antenna resonates from 3.03 to 10.6&#xa0;GHz with a notch band at Wi-Fi bands (2.4 and 5&#xa0;GHz). The antenna metrics with and without a narrow rectangular slot were analysed. With optimal dimensions of the slot, lower return loss of − 35.07&#xa0;dB, standing wave ratio of 1.12, gain 5.98&#xa0;dB and radiation efficiency of 99.8% is observed through electromagnetic simulation. The slotted elliptical antenna is fabricated with copper as conductor and polymer composite film as substrate, which is then tested using a network analyser and closed chamber. The measured return loss is − 33&#xa0;dB with VSWR &lt; 2.5 for the entire UWB range. Bending analysis on different radii implies a sustained performance of the antenna with an average antenna efficiency of 94.88%.</p>

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Characterization and conformal analysis of ultrawideband cognitive radio antenna using polyvinyl alcohol and graphite composite substrate

  • 期刊论文

  • 发表日期：

    2025年8月9日

查看全文
  • Ramyea R,
  • Kasthuri N,
  • Senthil Kumar Kandasamy

摘要

Cognitive radio (CR) technology provides wireless access to emerging wearable and flexible bio sensing applications. Owing to the spectrum scarcity, the available frequencies in the UWB (Ultrawideband) can be assigned to other users via CR antenna. Designing antennas for such networks with conformal substrates is an interesting and innovative task. Existing conventional substrates such as FR4 based antenna often suffers from high return loss and standing waves due to high dielectric constant of about 4.4. The paper focuses on the novel polymer composite thin film preparation from polyvinyl alcohol (PVA) and Graphite. Dielectric constant of the thin film is measured as 2.27 and it is used in the simulation of elliptical wideband antenna. Antenna resonates from 3.03 to 10.6 GHz with a notch band at Wi-Fi bands (2.4 and 5 GHz). The antenna metrics with and without a narrow rectangular slot were analysed. With optimal dimensions of the slot, lower return loss of − 35.07 dB, standing wave ratio of 1.12, gain 5.98 dB and radiation efficiency of 99.8% is observed through electromagnetic simulation. The slotted elliptical antenna is fabricated with copper as conductor and polymer composite film as substrate, which is then tested using a network analyser and closed chamber. The measured return loss is − 33 dB with VSWR < 2.5 for the entire UWB range. Bending analysis on different radii implies a sustained performance of the antenna with an average antenna efficiency of 94.88%.