scholarly journals A Low Profile Ultrawide Band Monopole Antenna for Wearable Applications

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Srinivas Doddipalli ◽  
Ashwin Kothari ◽  
Paritosh Peshwe
Keyword(s):  
Free Space ◽  
Specific Absorption Rate ◽  
Monopole Antenna ◽  
Human Tissues ◽  
Radiation Characteristics ◽  
Wide Bandwidth ◽  
Overall Design ◽  
Antenna Performance ◽  
Low Profile ◽  
The Impact

A low profile pentagonal shaped monopole antenna is designed and presented for wearable applications. The main objective of this paper is to design a miniaturized ultrawide band monopole planar antenna which can work efficiently in free space but also on the surface of the human body. The impact of human tissues on antenna performance is explained using the proposed pentagonal monopole antenna. The antenna is designed with a pentagonal radiator and a matched feed line of 50 ohm and square slots are integrated on defected ground of FR4 substrate with a size of 15 mm × 25 mm to achieve ultrawide band (UWB) performance in free space and human proximity. This overall design will enhance the antenna performance with wide bandwidth ranging from 2.9 GHz to 11 GHz. Specific absorption rate (SAR) of the proposed antenna on dispersive phantom model is also measured to observe the exposure of electromagnetic energy on human tissues. The simulated and measured results of the proposed antenna exhibit wide bandwidth and radiation characteristics in both free space and human proximity.

scholarly journals Anticipated Impact of Hand-Hold Position on the Electromagnetic Interaction of Different Antenna Types/Positions and a Human in Cellular Communications

2008 ◽  
Vol 2008 ◽  
pp. 1-22 ◽  
Author(s):  
Salah I. Al-Mously ◽  
Marai M. Abousetta
Keyword(s):  
Specific Absorption Rate ◽  
Electromagnetic Interaction ◽  
Fdtd Method ◽  
Human Head ◽  
Human Hand ◽  
Model Design ◽  
Antenna Performance ◽  
The Impact ◽  
Internal Antenna ◽  
Difference Time

This paper is intended to investigate intensely the impact of multipossible hand-hold positions on the electromagnetic (EM) interaction of handset antennas and a human by using a finite-difference time-domain (FDTD) method. Candy-bar handsets with different external and internal antenna positions operating in the GSM900, GSM1800/DCS, and UMTS/IMT-2000 bands are hereby simulated with configuration of the most parts in order to achieve the commercially available handset model design. Homogeneous and heterogeneous phantoms both are used to simulate the human head, whereas, a semirealistic model with three different tissues is designed to simulate a human hand holding a set. Both of the antenna performance including the total isotropic sensitivity (TIS) and the specific absorption rate (SAR) in tissues are examined for the different suggested applicable cases, where various positions of antenna, handset and hand are considered in simulations. This simulation study determines that both of the antenna performance and the SAR in tissues significantly alter owing to the positioning of the handset against user's head at different hand levels; where a maximum alteration is observed due to the exposure of handset with internal antenna, as compared with the handset having external antenna.

scholarly journals Small Antennas for Wearable Sensor Networks: Impact of the Electromagnetic Properties of the Textiles on Antenna Performance

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5157
Author(s):  
Gabriela Atanasova ◽  
Nikolay Atanasov
Keyword(s):  
Sensor Networks ◽  
Loss Tangent ◽  
Rapid Development ◽  
Substrate Material ◽  
Radiation Efficiency ◽  
Electromagnetic Properties ◽  
Textile Materials ◽  
Antenna Performance ◽  
Low Profile ◽  
The Impact

The rapid development of wearable wireless sensor networks (W-WSNs) has created high demand for small and flexible antennas. In this paper, we present small, flexible, low-profile, light-weight all-textile antennas for application in W-WSNs and investigate the impact of the textile materials on the antenna performance. A step-by-step procedure for design, fabrication and measurement of small wearable backed antennas for application in W-WSNs is also suggested. Based on the procedure, an antenna on a denim substrate is designed as a benchmark. It demonstrates very small dimensions and a low-profile, all while achieving a bandwidth (|S11| < −6 dB) of 285 MHz from 2.266 to 2.551 GHz, radiation efficiency more than 12% in free space and more than 6% on the phantom. Also, the peak 10 g average SAR is 0.15 W/kg. The performance of the prototype of the proposed antenna was also evaluated using an active test. To investigate the impact of the textile materials on the antenna performance, the antenna geometry was studied on cotton, polyamide-elastane and polyester substrates. It has been observed that the lower the loss tangent of the substrate material, the narrower the bandwidth. Moreover, the higher the loss tangent of the substrate, the lower the radiation efficiency and SAR.

scholarly journals A Novel Four Element Low Profile and Compact Conical Dielectric Resonator Antenna for Wideband Applications

2018 ◽  
Vol 7 (2) ◽  
pp. 1-4
Author(s):  
V. R. Kaushik ◽  
R. K. Gangwar
Keyword(s):  
Radiation Pattern ◽  
High Frequency ◽  
Dielectric Resonator ◽  
Dielectric Resonator Antenna ◽  
Radiation Characteristics ◽  
Wide Bandwidth ◽  
Average Gain ◽  
High Frequency Structure Simulator ◽  
Low Profile ◽  
Coaxial Probe

In this paper, a four element Conical Dielectric Resonator Antenna fed through coaxial probe is presented. This Low Profile and compact novel Antenna is designed for Wideband application and its input and radiation characteristics determined through the Ansoft High Frequency Structure Simulator (HFSS) Software. The proposed antenna provides wide Bandwidth (45%) and high average gain (5.15 dBi) with Monopole type Radiation Pattern.

scholarly journals Performance Characteristics of Head-Worn Antenna based on Dielectric Substrate Over WBAN Application

2018 ◽  
Vol 7 (4.30) ◽  
pp. 403
Author(s):  
Abdul Rashid .O. Mumin ◽  
R. Alias ◽  
Jiwa Abdullah ◽  
Raed A Abdulhasan ◽  
Samsul Haimi Dahlan ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Free Space ◽  
Human Head ◽  
Dielectric Substrate ◽  
Performance Characteristics ◽  
Electromagnetic Properties ◽  
Head Model ◽  
Antenna Performance ◽  
Loss Efficiency ◽  
The Impact

Performance characteristics of head-worn antenna based on dielectric substrate for WBAN application with various dielectric constant for square slot patch antenna are demonstrated in this paper. The impact of Electromagnetic (EM) energy from antenna towards human head and on antenna performance changes due to human head proximity are explored in this paper. The human head exposed to 5.8 GHz on ISM frequency band and radiation pattern, return loss, efficiency, and bandwidth and SAR distribution value performance have been thoroughly explored. However, decreasing the antenna size is a great topic ‎of antenna development, which differentiates antenna performance for a small antenna. Multilayered human head phantom having five layers are constructed based on different tissues and these tissues represent human head parts such as (Skin, fat, Cerebrospinal fluid (CSF), bone and brain), all of each tissues are based on their electromagnetic properties and set at 5.8GHz.The proposed antenna with human head model simulated through (FDTD) using CST and variation of parameters of antenna with MATLAB.  Antenna with FR4 substrate produces the highest SAR values while antenna with RT5880 substrate has the lowest SAR value 0.206 W/kg and 0.0784 W/kg at 5.8 GHz frequency exposed for 10g tissue respectively. It can be observed that the radiation pattern shows that the antenna gain with substrate of Rogers RT5880 is increased from front –to-back from 7.1 to 7.29 dB in the free space and on human head respectively. A good agreement between simulation and measurements in free space are obtained. The presented prototype has a potential to work for ISM applications.

Measurement Analysis of Ultra-Wideband Monopole Antenna With Defected Ground Structure

2017 ◽  
Vol 6 (1) ◽  
pp. 1-12
Author(s):  
Madan Kumar Sharma ◽  
Mithilesh Kumar ◽  
J.P. Saini
Keyword(s):  
Monopole Antenna ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Radiation Characteristics ◽  
Measurement Analysis ◽  
Low Profile ◽  
X 24 ◽  
Uwb Applications

This article describes how a compact, low profile Ultra-wideband (UWB) monopole antenna with a defected ground structure is designed and demonstrated experimentally. The design and experimentation activities have been carried out with the help of a CST Microwave studio tool. The UWB characteristics of the proposed antenna are achieved with a modification of the ground structure of the referenced antenna with novel L shaped defected ground structure (DGS). Both antennas are fabricated on the same substrate with the dimensions of 28.3 x 24 mm2. The comparative analysis of the results for both antennas clearly indicate that the proposed UWB monopole antenna enhanced the impedance bandwidth from 3.7 GHz – 14.9 GHz without DGS and to 3.4 GHz – 20 GHz with DGS. The enhanced bandwidth, constant group delay and good radiation characteristics of the proposed antenna have identified it as a good candidate for portable UWB applications.

scholarly journals Compact Ultra-Wideband Monopole Antenna Loaded with Metamaterial

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 796 ◽  
Author(s):  
Samir Salem Al-Bawri ◽  
Hui Hwang Goh ◽  
Md Shabiul Islam ◽  
Hin Yong Wong ◽  
Mohd Faizal Jamlos ◽  
...  
Keyword(s):  
Poor Performance ◽  
Split Ring Resonator ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Negative Permittivity ◽  
Wide Bandwidth ◽  
Low Profile ◽  
Compact Size ◽  
Unit Cells ◽  
Uwb Applications

A printed compact monopole antenna based on a single negative (SNG) metamaterial is proposed for ultra-wideband (UWB) applications. A low-profile, key-shaped structure forms the radiating monopole and is loaded with metamaterial unit cells with negative permittivity and more than 1.5 GHz bandwidth of near-zero refractive index (NZRI) property. The antenna offers a wide bandwidth from 3.08 to 14.1 GHz and an average gain of 4.54 dBi, with a peak gain of 6.12 dBi; this is in contrast to the poor performance when metamaterial is not used. Moreover, the maximum obtained radiation efficiency is 97%. A reasonable agreement between simulation and experiments is realized, demonstrating that the proposed antenna can operate over a wide bandwidth with symmetric split-ring resonator (SSRR) metamaterial structures and compact size of 14.5 × 22 mm2 (0.148 λ0 × 0.226 λ0) with respect to the lowest operating frequency.

scholarly journals Design of Dual-Band and Low-Profile SIW Cavity-Backed Slot Antenna for 5G Applications

2021 ◽  
Author(s):  
Amit Kumar ◽  
Amit Kumar Singh
Keyword(s):  
Ground Plane ◽  
Effective Length ◽  
Dual Band ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Radiation Characteristics ◽  
Antenna Performance ◽  
Dual Band Antenna ◽  
Low Profile ◽  
Via Hole

In this communication, the design of a dual-band and low-profile SIW cavity-backed slot antenna operating at K-band and Ka-band has been proposed to expand the Impedance bandwidth (IBW) of the antenna. The dual-band antenna consists of the SIW cavity with two parallel slots etched on the conductor’s ground plane. To obtain a dual-band, higher-order hybrid modes are tuned and combined to form the second band of the proposed antenna with a broader bandwidth. For dual-band antenna, fractional bandwidth of 5.26% and 6.15% are attained with the maximum gain of 5.45 dBi and 6.15 dBi at 24.7 GHz and 27.8 GHz, respectively. A cavity-backed antenna using via-hole and the slot has been proposed to improve an IBW and other antenna performance parameters. Via-hole establishes a connection between the top and bottom surfaces of the cavity, creating a new path for the current to flow by shortening the slot’s effective length. An IBW of 4.2 GHz (15.32%), where a gain of 7.8 dBi and 9.2 dBi have been realized at 25.9 GHz and 28.8 GHz, respectively. Isolation of less than 25 dB has been achieved through simulation. In terms of λ0, the overall volumetric dimension of the proposed antenna is 1.68 λ0×1.31λ0×0.04λ0. The proposed design demonstrates better performance in terms of antenna parameters, including compactness, good radiation characteristics, enhanced impedance bandwidth, and higher gain than the latest state of the art.

Sign in / Sign up

Export Citation Format

Share Document