[show abstract][hide abstract] ABSTRACT: Bandwidth characteristics of a wearable antenna are one of the major factors in determining its usability on the human body. In this work, a novel structure is proposed to achieve a large bandwidth, in order to avoid serious antenna reflection coefficient detuning when placed in proximity of the body. The proposed structure is designed based on a simple structure, in order to provide practicality in real world applications and at the same time, fabrication simplicity. Two different types of conductive textiles, namely Pure Copper Polyester Taffeta Fabric (PCPTF) and ShieldIt, are used in order to proof its concept, in comparison with a metallic antenna made from copper plate. The two layered design is fabricated and spaced by a 6 mm thick fleece fabric. A conventional plain structure, in contrast to the introduced design, is also fabricated in order to proof its bandwidth broadening capability, aside from a sensitivity analysis. From this investigation, it is found that the mentioned proposed structure extended the bandwidth by a factor two compared to the measured plain copper plate antenna, with an almost similar gain and radiation pattern characteristic.
[show abstract][hide abstract] ABSTRACT: Due to their popularity, antennas implemented on conductive textiles have been widely investigated. Prototypes of full-textile antennas are also usually pre-investigated using conductive foils, which is more homogeneous and provides better mechanical consistency. However, in today's practical applications, various electronic devices are still implemented on low-cost FR4 boards, popular in printed circuit board (PCB) technology. This work evaluates an FR4-textile hybridization scheme. It studies one topology fabricated using this scheme and compares it with two other fabrication technologies, using either copper foil or a full-textile structure. Through the work done, it is then possible to better estimate the frequency shift in S 11 due to the use of a certain build. Measurement of the hybrid antenna in free space indicated bandwidth degradation in comparison to simulations. On the contrary, measurement in proximity of a human arm produced a larger bandwidth. The antennas' gains and efficiencies when placed in proximity of a human body model are also studied and discussed.
[show abstract][hide abstract] ABSTRACT: Introduction of parasitic plane as additional radiator helps to produce desired resonant frequencies, while helping to minimize the size of the antenna. A dual-band monopole antenna with parasitic plane is designed to satisfy dual-band applications, namely UMTS and WLAN 802.11. This work is an effort to investigate the effect of employing an inverted M-shaped parasitic plane, which introduces double slits in the monopole structure. The antenna parametric analysis of the antenna configuration was performed using experimental method. Results simulated and measured shows good correlation and the antenna is verified to be working in a dual band mode.