Radiation efficiency measurements of embroidered textile radiating elements placed in the vicinity of a human equivalent phantom

摘要

In assessing the embroidered conductive yarn textile antennas, which are commonly used in the vicinity of a human body, it is important to assess the following two types of loss: 1) the loss caused by a human body, and 2) the loss caused by a conductive yarn. The sewing pattern of radiating elements affects the plasticity, flexibility and texture of the embroidered antenna. Also, the sewing pattern affects the radiation efficiency of the antenna. This paper presents the measured radiation efficiencies of full and partially embroidered textile dipole antennas with different sewing patterns. The proposed partially embroidered antennas (Model A and Model B) with current-distribution-based sewing patterns can reduce the amount of conductive yarn by 80% and 91%, respectively. The difference in the measured radiation efficiency between the Model A antenna and the same sized copper reference antenna was 1-12% when the antennas were placed in the vicinity of a phantom.