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Wearable textile antennas fabricated using embroidery technology offer a suitable solution for the production of prototypes, small series as well as for antenna mass production. Compared to other common techniques such as using copper tapes or conductive fabrics, realizing the antenna using industrial embroidery machines provides better geometrical repeatability, especially for complex structures and achieves a higher productivity. Due to the higher loss of the conductive thread in comparison to conductive woven fabrics, the antenna realized using embroidery technique suffers from lower radiation efficiency (low realized gain). It is reported that the realized gain for an embroidered antenna is typically less than 3 dBi or even less than 0 dBi depending on the chosen parameters (e.g. conductive thread type, stitch direction, and stitch spacing). The resonant cavity concept is a promising solution to increase the antenna gain [5]. Resonant cavity antennas using PRS have been subject of great interest to many researchers especially during the last decade, but most of them are fabricated using conventional materials and standard etching technology (photolithography). In this work, we demonstrate to the best of our knowledge for the first time the realization of an embroidered PRS antenna using conductive thread and other textile materials. Choosing the proper unit cell shape and accurately embroidering the PRS and the radiator structures are some of the important challenges. The fabricated antenna is measured in terms of its input reflection, realized gain and radiation pattern.
Our idea is to usephysicaltouches as primary cluesto detect hotspots, while adding motion features(especially in depth)as subsidiary to enhance the performance.For this purpose, we take the advantage of egocentricvisionwhichcan provideless occlusion.Touches are detected based on the distance between handsand objects, and locationsand frequency of touchesare checked and inte-grated in the global map.Hand shapes in approaching or touching hotspotsare used for discriminatinghotspots and also categorizingthe actions.
