Body-centric Wireless Networks Research Articles

Design of UWB Band Notch Textile Antenna for Body-Centric Wireless Network with the Comparison of Five Different Textile Substrates

Designing an effective antenna on textile substrate is quite a challenging issue which needs close monitoring of antenna return loss performance, gain, radiation pattern, efficiency etc. This paper presents the basic design of Ultra Wideband (UWB) band notch textile antenna for body-centric wireless network. Moreover, Wireless Communication is a notable communication practice and the UWB body-centric wireless communication is one of the foremost attractive ones. Hence, to design the UWB textile antenna, five different substrates have been used and analyzed for better performance evaluation. Textile substrates make the antenna wearable, and therefore can be used in sport monitoring, and in different medical applications as well. Comparing the designed antenna with five different substrates, finally the antenna is proposed with 100% Polyester substrate because among the other four textile substrates, it shows better and also has the intended antenna performance.

Nano Boyutlu Vücut Merkezli Kablosuz Ağların Alveolar Alanları ve İnsan Dokuları için Numerik Analizi

This paper investigates the propagation of Terahertz (THz) electromagnetic waves inside the human body and discusses a model of the system performance of Nanoscale Body-Centric Wireless Networks inside the alveolar spaces and human tissues. THz band wireless communication enables new applications especially in nanoscale wireless communication. The model developed in this paper calculates the total absorption loss, path loss and capacity properties of EM waves propagating through the Alveolar Spaces and Human Tissues in nanoscale environment for THz band wireless communication. Based on the modeling of noise level and path losses, the channel capacity is calculated. The results show that Wireless Nanosensor Networks (WNSNs) can communicate through the human body. According to the numerical analysis of the model several transmission windows which are ω1 = [0.01 THz – 0.5 THz], ω2 = [0.58 THz – 0.74 THz] and ω3 = [0.77 THz – 0.96 THz] have been found for Nanoscale Body-Centric Wireless Networks. The longest and lowest transmission window which is in the range of 0.01 THz – 0.5 THz values have been analyzed for blood, plasma, RCBs and water to design universal nanonode for Nanoscale Body-Centric Wireless Networks at gases in lungs and blood.

A Glasses Frame Antenna for the Applications in Internet of Things

A novel concept of metal glasses frame antenna is proposed and relevant investigations are conducted to estimate its performance. A prototype antenna is designed based on a pair of glasses and then measured for demonstration and verification. It is indicated by the simulations and the measurements that the width of the ring rim has only a small impact on the performance. However, the investigation shows that the shape of the frame and even the material of the lens could impose significant influence on the resonance frequency points and the matching performance. The main lobe would shift away from the direct front if the feeding location is moved on the central pole connecting the two rings or the excitation is put on other points of the spectacles frame. The difference between the semi-rimmed glasses and the one with closed rings primarily lies in the beam width of the main lobe. It can be seen that a fractional bandwidth of 14.5% could be realized at 5.8 GHz, falling into the industrial, scientific, and medical (ISM) band. In addition, the maximum value of the simulated specific absorption rate (SAR) is 1.56 W/kg within this frequency band. The measurement results are well consistent with those of the simulations, indicating that it is a potential candidate serving as an efficient tool for sensing and communications for the applications in Internet of Things, especially body-centric wireless networks.

Planar Wide Band Microwave Frequency Antenna with Different Radiator Shapes

This paper is a study on the performances of planar UWB monopole antennas using a radiator of dif- ferent shapes such as triangle, rectangle, square, circle, annual ring,ellipse (both horizontal and vertical), penta- gon and hexagon, for body-centric wireless networks us- ing PDMS substrate.The planar antennas consist of a radiator and a microstrip-feed line on one side of the substrate and a ground plane on the other side.PDMS substrate provides flexibility to the antenna which can withstand severe mechanical shock by flexing instead of breaking.

NUMERICAL MODELLING OF HUMAN BODY FOR BLUETOOTH BODY-WORN APPLICATIONS

The human body has got a pivotal role in portable devices operating in Body-centric Wireless Networks (BCWNs). Electromagnetic interaction between lossy human body tissues and wearable antennas degrades the system performance. E-cient deployment of such systems necessitates thorough understanding of these efiects. Numerical analysis is a powerful tool that provides useful information of such scenarios fairly quicker than the actual measurements giving the user full control of the design environment. This paper investigates usefulness of numerical analysis based on the comparison of three difierent homogeneous models of the human body. Efiectiveness of a numerical model is evaluated in terms of its resolution, computational e-ciency, time consumption and accuracy of the results in software followed by experimental veriflcations.

Numerical Characterization and Modeling of Subject-Specific Ultrawideband Body-Centric Radio Channels and Systems for Healthcare Applications

The paper presents a subject-specific radio propagation study and system modeling in wireless body area networks using a simulation tool based on the parallel finite-difference time-domain technique. This technique is well suited to model the radio propagation around complex, inhomogeneous objects such as the human body. The impact of different digital phantoms in on-body radio channel and system performance was studied. Simulations were performed at the frequency of 3-10 GHz considering a typical hospital environment, and were validated by on-site measurements with reasonably good agreement. The analysis demonstrated that the characteristics of the on-body radio channel and system performance are subject-specific and are associated with human genders, height, and body mass index. Maximum variations of almost 18.51% are observed in path loss exponent due to change of subject, which gives variations of above 50% in system bit error rate performance. Therefore, careful consideration of subject-specific parameters are necessary for achieving energy efficient and reliable radio links and system performance for body-centric wireless network.

Comparison between two different antennas for UWB on-body propagation measurements

The effect of two different antenna types on radio propagation in ultrawideband (UWB) on-body channel measurement are analyzed. Statistical path loss parameters and time domain channel characteristics [mean delay and root mean square (rms) delay spread] are extracted from measurement data. Reduction in rms delay spread is experienced when using printed horn shaped self-complementary antennas (HSCA) for specific body area links in comparison to monopole-like omnidirectional antennas, e.g., planar inverted cone antennas (PICA). Results show that the hybrid use of different type UWB antennas can effectively improve channel behavior in body-centric wireless networks.