Integrated in Clothes Graphene Antenna with Low SAR for Wearable Body-Centric Communications

The design and fabrication of graphene based textile patch antennas, intended for use in the 2.45GHz ISM band, are presented. The antennas have simple geometries with rectangular, triangular, or circular shape and substrate materials made of four different fabrics suitable for wearable applications. Conductive graphene sheet is used for the active element patches of the twelve different proposed prototypes. The effects of the antenna geometry, the substrate selection and the graphene-textile fabrication process on the prototypes’ performance are studied. Several prototypes exhibit desirable characteristics, such as high gain, acceptable radiation pattern, low Specific Absorption Rate (SAR), relatively wide bandwidth, and coverage of the ISM band even under different bending conditions.

Download Full-text

Miniaturized implantable power transmission system for biomedical wireless applications

Wireless Power Transfer ◽

10.1017/wpt.2019.16 ◽

2020 ◽

Vol 7 (1) ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Shuoliang Ding ◽

Stavros Koulouridis ◽

Lionel Pichon

Keyword(s):

Reflection Coefficient ◽

Radiation Pattern ◽

Absorption Rate ◽

Specific Absorption Rate ◽

Power Transmission ◽

Antenna Design ◽

Wireless Power ◽

Specific Absorption ◽

Wireless Applications ◽

Power Needs

AbstractIn this paper, a complete wireless power transmission scenario is presented, including an external transmission antenna, an in-body embedded antenna, a rectifying circuit, and a powered sensor. This system operates at the Industrial, Scientific, and Medical bands (902.8–928 MHz). For the antenna design, important parameters including reflection coefficient, radiation pattern, and specific absorption rate are presented. As for the rectifying circuit, a precise model is created utilizing off-the-shelf components. Several circuit models and components are examined in order to obtain optimum results. Finally, this work is evaluated against various sensors' power needs found in literature.

Download Full-text

ESTIMATION OF SPECIFIC ABSORPTION RATE IN THE HUMAN LEG AND TESTICLE DUE TO A METALLIC RING

Jurnal Teknologi ◽

10.11113/jt.v77.6289 ◽

2015 ◽

Vol 77 (10) ◽

Author(s):

Nazirah Othman ◽

Noor Asmawati Samsuri ◽

Mohamad Kamal A Rahim

Keyword(s):

Radiation Pattern ◽

Human Body ◽

Absorption Rate ◽

Specific Absorption Rate ◽

Dipole Antenna ◽

Antenna Radiation ◽

Specific Absorption ◽

Antenna Radiation Pattern ◽

Half Wave ◽

Metallic Ring

This research evaluates the effect of human body and metallic ring in the vicinity of dipole antenna on antenna radiation pattern and Specific Absorption Rate (SAR). Homogeneous and realistic body models have been considered in the paper. Half wave dipole antenna is used as the excitation source operating at 0.9 GHz and 1.8 GHz. The metallic ring is modelled as conducting objects. The results have shown that the presence of human body near to the antenna significantly distorted the antenna radiation pattern. The antenna gain is decresed approximately 10 dB at 0.9 GH and 25 dB at 1.8 GHz in the direction of body. Nevertheless, the presence of metallic ring do not have any profound effect on antenna radiation pattern due to their size which is relatively small compared to the size of the human body. Additional metallic ring close to the human leg could alter the SAR and the effect varies depending on the size of the rings. The presence of metallic ring significantly increases the averaged 10g SAR inside the testicle by more than 20% at 1.8 GHz.

Download Full-text

An artificial magnetic conductor‐backed monopole antenna to obtain high gain, conformability, and lower specific absorption rate for WBAN applications

International Journal of RF and Microwave Computer-Aided Engineering ◽

10.1002/mmce.22441 ◽

2020 ◽

Vol 30 (12) ◽

Author(s):

Bidisha Hazarika ◽

Banani Basu ◽

Arnab Nandi

Keyword(s):

Absorption Rate ◽

Specific Absorption Rate ◽

High Gain ◽

Monopole Antenna ◽

Magnetic Conductor ◽

Specific Absorption ◽

Artificial Magnetic Conductor

Download Full-text

Wideband and High-Gain Wearable Antenna Array with Specific Absorption Rate Suppression

Electronics ◽

10.3390/electronics10172056 ◽

2021 ◽

Vol 10 (17) ◽

pp. 2056

Author(s):

Haoran Zu ◽

Bian Wu ◽

Peibin Yang ◽

Wenhua Li ◽

Jinjin Liu

Keyword(s):

Antenna Array ◽

Absorption Rate ◽

Specific Absorption Rate ◽

High Gain ◽

Specific Absorption ◽

Wearable Antenna ◽

Measurement Results ◽

Rate Suppression ◽

Radiation Direction ◽

Good Agreement

In this paper, a wideband and high-gain antenna array with specific absorption rate suppression is presented. By adopting the wideband monopole antenna array and the uniplanar compact electromagnetic band gap (UC-EBG) structure, the proposed wearable antenna array can realize a high gain of 11.8–13.6 dBi within the operating band of 4.5–6.5 GHz. The sidelobe level of the proposed wearable antenna array is less than −12 dB, and the cross polarization in the main radiation direction is less than −35 dB. Benefiting from the UC-EBG design, the specific absorption rate is suppressed effectively, guaranteeing the safety of the proposed antenna array to the human body. The proposed antenna array is processed and tested, and the measurement results show good agreement with the simulation results.

Download Full-text