On the Way to Green IoT Antennas: Compact Ultra-Thin CPW-Fed Monopole on Tencel

Gómez, María Elena de Cos; Berdasco, A. Flórez; Álvarez, Humberto Fernández; Las-Heras, Fernando

doi:10.23919/eucap48036.2020.9135455

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Some flexible antennas are designed to work well under a specific bandwidth, but not necessarily a very large bandwidth for all applications. 131 A more general issue that inkjetprinted devices face is the risk of manufacturing defects, which can affect device sensitivity. 75 This is a challenge that comes with many other electronic components and is certainly not unique to inkjetprinted devices but is still worth noting, especially because sensitivity is particularly important in medical sensors.…”

Section: Challenges In Inkjetprinted Sensors and Antennasmentioning

confidence: 99%

Sensors for Smart Agriculture and Beyond…

2023

Electrochem. Soc. Interface

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Section: Challenges In Inkjetprinted Sensors and Antennasmentioning

confidence: 99%

Sensors for Smart Agriculture and Beyond…

2023

Electrochem. Soc. Interface

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C-shaped antenna based artificial magnetic conductor structure for wearable IoT healthcare devices

et al. 2021

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A wearable C-shaped antenna based on a fabric material operating at 2.4 GHz frequency is proposed for use in flexible/wearable IoT medical systems. The wearable IoT device plays a key role in medical applications, and the antenna is a key part of it. Loading the presented antenna on the body models showed a frequency detuned with the gain and efficiency reduced from 1. 28 to −9 dB and 90% to 10%. In addition, the SAR did not meet the safety health requirement defined by the FCC or ICNIRP standards. Therefore, an “Artificial Magnetic Conductor” structure (AMC) is added to the C-shaped antenna to overcome these problems. The AMC acts as shielding material between the human skin and the presented antenna because of its 0° reflection phase, which mimics the action of the Perfect Magnetic Conductor (PMC). The overall size of the proposed design was 54 × 54 × 3.9 mm 3 . Numerical and experimental findings indicated that integrating the AMC structures with a C-shaped antenna was robust for body deformation and load. The C-shaped antenna worked equally well with the AMC, whether positioned in free space or on the chest or the arm of the human body. The integrated antenna with AMC structures has excellent performances. The gain and efficiency without loading on the chest were 6.49 dB and 84%, respectively. While for loaded on the chest were 6.21 dB and 81%, respectively. It also decreased the back radiation and raised the Front to Back Ration (FBR) by 13.8 dB. SAR levels have been reduced by more than 90% between the FCC and ICNIRP standards compared to the C-shaped antenna alone, which does not comply with the standards. As a result, the C-shaped integration with AMC structures is highly suitable for assembly in any wearable system. Supplementary Information The online version contains supplementary material available at 10.1007/s11276-021-02770-4.

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