M. S. Shakhirul

1.575 GHz Circular Polarization wearable antenna with three different substrate materials

This paper presents an analysis of a Left-Handed Circular Polarization (LHCP) wearable antenna with different textile material (substrates) for Global Positioning System (GPS) application. The proposed antennas have achieved circular polarization (CP) by truncating two opposite edged of the square patch for all designed antennas with three different substrates. The analysis is focusing on using felt, jeans and cotton as substrates while maintaining shieldit supper as a conductor. The performance comparison have been made on the simulated reflection coefficient (S11), axial ratio (AR), bandwidth and gain. The results show that jeans fabric attained a better reflection coefficient of -41.36 dB at 1.575 GHz as compared to the other materials. Besides, the jeans has achieved good AR bandwidth of 17 MHz, followed by felt with AR bandwidth of 16 MH and cotton with AR bandwidth of 13 MHz.

Analysis of circular polarization textile antenna in bending condition

A circular polarization (CP) textile antenna is designed for Global Positioning System (GPS) application. The truncated rectangular patch antenna is has a full ground plane from Shieldit Super and felt fabric as a substrate. The proposed antenna operates at 1.575 GHz with a good bandwidth from 1.540 to 1.625 GHz. The optimized chamfer has been made at two edges of a rectangular patch in order to produce a Left Hand Circular Polarization (LHCP) with a good axial ratio (AR) badwidth of 1.569 to 1.589 GHz. This manuscript also presents the analytical performances of CP textile antenna under bending condition that suitable for the on-body antenna applications.

Modeling and analysis of deformations of WBAN antennas

This paper presents the design and modeling of deformations of textile antenna wireless body area network (WBAN) applications. The performance of a compact planar flexible antenna is analyzed in terms of reflection coefficient and radiation pattern under bending and crumpling conditions. Unlike in the existing works, the bending condition in this work carried out in two different axes, x-axis and y-axis respectively to further investigate the performance of the antenna. This antenna which is made fully using textiles is designed for operation in the 2.45 GHz band. It is designed based on typical rectangular line-fed microstrip antenna and investigated under two bending axes.

Adaptive beam steering: RSSI performance

Adaptive beam steering antenna has been develop in this research. The proposed antenna is capable to steer the radiation pattern to phi of 0°, 45°, 135°, 225° and 315° angles and theta of 0°, 13°, 15°, 10° and 12°. This could be achieved with the suitable design antenna based on the patch yagi-uda antenna concept with a single radiator and four parasitic elements. Such four elements is control by the activation of four pin diode RF switches that enable the parasitic to perform as director or reflector. However, the shorting pin location from each element to the ground plane is really crucial. This paper has emphasis more on the antenna performance through Received Signal Strength Indication (RSSI). The RSSI is measured with five Line of Sight (LOS) distances of 0 m, 5 m, 10 m, 15 m and 20 m. Varied power received is analyzed based on each pin diode RF switch conditions to enable the beam steering ability.

The Embroidered Wearable Antenna for UWB Application

This paper discusses the design of a wearable textile antenna for Ultra Wide Band (UWB) application. This embroidered antenna addresses the issues of miniature size, wide bandwidth and low power consumption. A textile cotton has been chosen as a substrate and silver nylon plated yarn as a conductive element embroidered on cotton substrate. Simulated and measured results show that the proposed antenna design meets the requirements of wide working bandwidth with compact size and flexible material. The performances in terms of reflection coefficient, impedance bandwidth, current distribution as well as gain and antenna efficiency are compared between simulations and measurements and good agreement was observed.

The Embroidered Antenna on Bending Performances for UWB Application

The performances of embroidered UWB wearable textile antenna due to the effect in bend conditions is discussed in this paper. The radiating element of the antenna is made of silver plated nylon thread by using embroidery technique, while the antenna substrate is cotton fabric and Nora dell as a ground plane. This UWB antenna is designed for operating frequency from 3.1 up to 10.6 GHz with a center frequency of 6.85 GHz. This research demonstrates the antenna bending effect at seven different angles in terms of the simulated and measured reflection coefficient.