Measured Results of Input Resistance of NMHA in a Body Phantom

Zainudin, Norsiha; Latef, Tarık Abdul; Yamada, Yoshıhıde; Kamardin, Kamilia; Aridas, Narendra Kumar; Baharin, Rasyidah Hanan Mohd

doi:10.1109/tafgen.2018.8580474

Cited by 3 publications

(1 citation statement)

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“…However, the implantable antennas face more difficulties and challenges than a wearable antenna for on-body communication due to the complex human tissue conditions. The human body is often referred to as a "lossy" medium due to the performance of antennas that is easily affected by the conductivity (σ) and permittivity (ε r ) inside the human body [18][19][20][21]. Due to the lossy characteristic of the human body, the radio wave degradation has been very severe.…”

Section: Introductionmentioning

confidence: 99%

Increase of Input Resistance of a Normal-Mode Helical Antenna (NMHA) in Human Body Application

Zainudin

Latef

Aridas

et al. 2020

Sensors

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In recent years, the development of healthcare monitoring devices requires high performance and compact in-body sensor antennas. A normal-mode helical antenna (NMHA) is one of the most suitable candidates that meets the criteria, especially with the ability to achieve high efficiency when the antenna structure is in self-resonant mode. It was reported that when the antenna was placed in a human body, the antenna efficiency was decreased due to the increase of its input resistance (R in ). However, the reason for R in increase was not clarified. In this paper, the increase of R in is ensured through experiments and the physical reasons are validated through electromagnetic simulations. In the simulation, the R in is calculated by placing the NMHA inside a human's stomach, skin and fat. The dependency of R in to conductivity (σ) is significant. Through current distribution calculation, it is verified that the reason of the increase in R in is due to the decrease of antenna current. The effects of R in to bandwidth (BW) and electrical field are also numerically clarified. Furthermore, by using the fabricated human body phantom, the measured R in and bandwidth are also obtained. From the good agreement between the measured and simulated results, the condition of R in increment is clarified.

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Section: Introductionmentioning

confidence: 99%