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The use of flexible materials such as textile, vinyl and flexible polymer as a substrate for designing wearable antenna are becoming very popular. As the antennas are easily exposed to mechanical deformation while being worn by users, the necessity to measure and analyze the effect of the antenna deformation towards the antenna performance and electromagnetic (EM) energy absorbed by the body are increasing...
This paper evaluates the interaction between the human body and dipole antenna in the presence of conductive medical implant. A Voxel body model is exposed to the radiation source at three different frequencies; 0.9 GHz, 1.8 GHz and 2.4 GHz. A conductive bone plate is implanted inside the Voxel body in order to investigate the effect of medical implant on the Specific Absorption Rate (SAR). Results...
The design of Log Periodic Fractal Koch antennas at four different series of iterations are discussed in this paper. This technique is used to reduce the size of the antenna. In this works 0th iteration, 1st iteration, 2nd, 3rd and 4th series iteration have been applied to the antenna and the performance of the antenna on reflection coefficient, current distribution, radiation pattern and gain are...
This work investigates the transmission performance of on-body antennas with the proposed textile Artificial Magnetic Conductor (AMC) waveguide jacket. On-body measurements have been performed on male and female subjects to compare the S21 transmission of the antennas when positioned on top of the AMC sheet. The on-body transmission performance of the antennas when positioned on top of the AMC jacket...
A dual-band textile Artificial Magnetic Conductor (AMC) sheet-like waveguide with two single-band textile diamond dipole antennas made of fleece fabric have been designed and presented in the report. The AMC structure is designed to have zero reflection phase at 2.45 GHz and 5.8 GHz with the aim to improve the transmission between antennas. The performances of two antennas with textile AMC sheet have...
This research identifies and evaluates the effect of human body and conductive metallic objects in the vicinity of radiation source on Specific Absorption Rate (SAR). The presence of electronic devices in the vicinity of human body especially close to the human sensitive part especially when the antenna is left inside the trousers pocket could allow the radiated electromagnetic wave to penetrate inside...
In this paper, the interaction between a single band textile dipole antenna with human body is examined under several bending conditions. The numerical simulations of the single band 0.9 GHz patch dipole antenna are performed by using Computer Simulation Technology (CST) Microwave Studio. The Finite Integration Technique (FIT) method is utilized to determine the antenna performance. Results have clearly...
A slot dipole antenna with a reconfigurable operating frequency is presented. The antenna comprises two pairs of slot arms. Each arm incorporates a number of varactor diodes. The antenna is capable of operating in single-band or dual-band mode. In each case, the location of these bands can be altered by varying the voltage applied to the varactor diodes. The antenna can be tuned over a wide frequency...
Wire dipoles with textile Artificial Magnetic Conductor (AMC) sheet-like waveguide were designed to investigate the possibility of transmission enhancement between antennas. The substrate for the AMC is made of fleece fabric, while the patches and ground are made of SHIELDIT fabric. The AMC surface is designed to have in-phase reflection at 2.45GHz with the aim to improve the transmission between...
This report presents a design of wide angle and polarization insensitive circular ring metamaterial absorber working at 10 GHz. The structure is designed on lossy FR4 substrate sandwiched by thin copper layers. From the simulation, the circular ring metamaterial absorber can operates at wide incident angle, where they maintain high absorbance, which is more than 87% for incident angles as large as...
In this paper, the interaction between a single band textile antenna with human body is examined. The simulations are performed by means of CST Microwave Studio with a single band 2.4 GHz patch dipole antenna as the radiating source. The effects of bending and different distances from the body are also considered in this study. Results have clearly indicated that the human body has notably shifts...
Wearable textile antennas are supposed to be integrated within the clothing or secured on the body. Therefore, the placement of the antennas and their orientation need to be carefully determined. In this paper, the interaction between a single band dipole textile antenna for wireless off-body communication applications with human body is examined. The simulations are performed by means of CST Microwave...
A simulation of reconfigurable frequency antenna is presented. The antenna is an integration of ultra-wide band antenna with a microstrip slot antenna. It has a capability to operate in ultra-wide band (0.98–12.0 GHz) and seven different narrow bands from 2 GHz to 4 GHz. Seventeen switches with eight configuration are used to select between ultra-wide band and the narrow bands. The proposed antenna...
The performances of the triple-band meandered dipole antenna backed by two different Artificial Magnetic Conductor (AMC) structures are discussed in this paper. Two kinds of AMC structures are presented namely rectangular-patch with rectangular slot and rectangular-patch with slotted rectangular and I-shaped slot. The AMCs are designed to operate at 0.92GHz and 2.45GHz. The performances of the antenna...
A design of dual-band high-impedance surface called Artificial Magnetic Conductor (AMC) is presented. The AMC is designed to resonate at 0.92GHz and 2.45GHz. In this paper also, the design parameters that influence the AMC frequencies are discussed. The designed AMC then is incorporated with the designed triple-band printed dipole antenna (operating at 0.92GHz, 2.45GHz and 5.8GHz). Here, the performance...
A meandered triple-band dipole antenna integrated with 920 MHz Artificial Magnetic Conductor (AMC) is presented. The AMC structure is called a high-impedance surface (HIS) structure and is useful as a ground plane to the antenna. This structure can be used to prevent the degradation of tag and antenna performance caused by the conductive materials (metal objects) and to increase the antenna gain.
A triple-band dipole antenna integrated with 0.92 GHz Artificial Magnetic Conductor (AMC) is presented. The AMC structure is called a high-impedance surface (HIS) structure and is useful as a ground plane to the dipole antenna. This structure can be used to prevent the degradation of tag and antenna performance caused by the conductive materials (metal objects) and to increase the antenna gain. This...
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