Characterization of ultra-wideband wave propagation inside human body

2010 ◽  
Author(s):  
A Khaleghi ◽  
I Balasingham
Keyword(s):  
Wave Propagation ◽  
Human Body ◽  
Ultra Wideband

PROPAGATION CHARACTERIZATION OF IMPLANTABLE ANTENNA AT UWB FREQUENCY – A REVIEW

2015 ◽  
Vol 77 (7) ◽  
Author(s):  
Maisarah Abu ◽  
Najmiah Radiah Mohamad ◽  
Adib Othman ◽  
Nor Azlan Mohd Aris ◽  
Indra Devi S. ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Radio Wave ◽  
Human Body ◽  
Wireless Body Area Network ◽  
Data Rate ◽  
Healthcare Management ◽  
Implantable Device ◽  
Radio Wave Propagation ◽  
Ultra Wideband ◽  
Area Network

A technology of wireless body area network (WBAN) was invented in order to enhance the quality of healthcare management as well as to determine faster disease prevention. However, to obtain the real-time data of images and videos from inside the human body, an implantable device is required. Currently, the Medical Implant Communication System (MICS) is used, but, this system has limited data rate which is a narrow-band of 402 – 405 MHz. Thus, this study on Ultra Wideband (UWB) for implanted device is conducted as UWB offers a wide transmission bandwidth as well as high data rate. Knowledge of radio wave propagation behaviour inside human body is needed to perform the implantation. Past researches related to this topic are limited and those conducted focused only on the human torso. This paper aims to provide a better understanding on the characteristics of radio wave propagation inside the human body by using an implantable device at UWB frequency. It is also hoped that this study could be used as reference for future research on this subject.

Measurement and characterization of indoor ultra-wideband propagation

2004 ◽  
Author(s):  
A.H. Muqaibel ◽  
A. Safaai-Jazi ◽  
A.M. Attiya ◽  
A. Bayram ◽  
S.M. Riad
Keyword(s):  
Ultra Wideband

scholarly journals In-Body Ranging with Ultra-Wideband Signals: Techniques and Modeling of the Ranging Error

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Muzaffer Kanaan ◽  
Memduh Suveren
Keyword(s):  
Neural Networks ◽  
Human Body ◽  
Extreme Value Distribution ◽  
Generalized Extreme Value Distribution ◽  
Ultra Wideband ◽  
Wideband Signals ◽  
Ranging Error ◽  
And Performance ◽  
Ranging Errors ◽  
Wireless Capsule

Results about the problem of accurate ranging within the human body using ultra-wideband signals are shown. The ability to accurately measure the range between a sensor implanted in the human body and an external receiver can make a number of new medical applications such as better wireless capsule endoscopy, next-generation microrobotic surgery systems, and targeted drug delivery systems possible. The contributions of this paper are twofold. First, we propose two novel range estimators: one based on an implementation of the so-called CLEAN algorithm for estimating channel profiles and another based on neural networks. Second, we develop models to describe the statistics of the ranging error for both types of estimators. Such models are important for the design and performance analysis of localization systems. It is shown that the ranging error in both cases follows a heavy-tail distribution known as the Generalized Extreme Value distribution. Our results also indicate that the estimator based on neural networks outperforms the CLEAN-based estimator, providing ranging errors better than or equal to 3.23 mm with 90% probability.

scholarly journals Wireless Body Area Networks: UWB Wearable Textile Antenna for Telemedicine and Mobile Health Systems

Micromachines ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 558 ◽  
Author(s):  
Ashok Yadav ◽  
Vinod Kumar Singh ◽  
Akash Kumar Bhoi ◽  
Gonçalo Marques ◽  
Begonya Garcia-Zapirain ◽  
...  
Keyword(s):  
Health Systems ◽  
Mobile Health ◽  
Human Body ◽  
Radiation Effects ◽  
Analytical Investigation ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Textile Antenna ◽  
Mobile Health Systems ◽  
The Time Domain

A compact textile ultra-wideband (UWB) antenna with an electrical dimension of 0.24λo × 0.24λo × 0.009λo with microstrip line feed at lower edge and a frequency of operation of 2.96 GHz is proposed for UWB application. The analytical investigation using circuit theory concepts and the cavity model of the antenna is presented to validate the design. The main contribution of this paper is to propose a wearable antenna with wide impedance bandwidth of 118.68 % (2.96–11.6 GHz) applicable for UWB range of 3.1 to 10.6 GHz. The results present a maximum gain of 5.47 dBi at 7.3 GHz frequency. Moreover, this antenna exhibits Omni and quasi-Omni radiation patterns at various frequencies (4 GHz, 7 GHz and 10 GHz) for short-distance communication. The cutting notch and slot on the patch, and its effect on the antenna impedance to increase performance through current distribution is also presented. The time-domain characteristic of the proposed antenna is also discussed for the analysis of the pulse distortion phenomena. A constant group delay less than 1 ns is obtained over the entire operating impedance bandwidth (2.96–11.6 GHz) of the textile antenna in both situations, i.e., side by side and front to front. Linear phase consideration is also presented for both situations, as well as configurations of reception and transmission. An assessment of the effects of bending and humidity has been demonstrated by placing the antenna on the human body. The specific absorption rate (SAR) value was tested to show the radiation effect on the human body, and it was found that its impact on the human body SAR value is 1.68 W/kg, which indicates the safer limit to avoid radiation effects. Therefore, the proposed method is promising for telemedicine and mobile health systems.

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