| The fabric-based signal transmission lines are necessary components of flexible fiber electronic products applying in wearable integration field,which not only ensure the wearable and flexibility of electronic fabric but also the electric energy and signal transmission between components.It provides a new way to replace the traditional metal conductor using in the fabric,and having a great development prospect in the electronic fabric application as well.In this paper,the signal transmission lines are made by embroidering.Change the embroidery process parameters such as stitch type,stitch space,stitch length and the embroidered tension to measure the DC resistance,impedance and S parameters of transmission lines,and then analyze the change of electrical parameters on the transmission performance of the embroidery transmission line.Research the bending performance of transmission line mainly including tension bending and extrusion bending,then study the change of the transmission line electrical parameters before and after bending,and makes comparative analysis.The main research contents are as follows:Firstly,in order to study the relationship between the transmission performances of the embroidery transmission line and the direction of the conductive yarn,the transmission lines in different stitch type are designed and the DC resistance,impedance and S parameters are tested.The research is shown that the embroidery transmission line in the stitch type of Running stitch has the lowest DC resistant but high electrical parameters at high frequency,and its RF performance is the best.The embroidery transmission lines in other stitch types have higher DC resistant but low electrical parameters in high frequency,and higher transmission loss as well.What’s more,the resonance frequency and impedance matching frequency of the transmission lines vary with different stitch types.Thus,Running stitch is more suitable for the production of transmission lines.Secondly,in order to do the research on the effect of the process parameters on the embroidery transmission line,the transmission lines in different embroidery process parameters are designed and the DC resistance,impedance and S parameters are tested.The research is shown that the change of the stitch spacing,stitch length and embroidery tension will not affect the resonance frequency and impedance matching frequency of transmission lines.When the stitch space is less than 0.8mm,the smaller space between each stitch the lower DC resistance is,but electrical parameters at high frequency are larger with better reflection and transmission performance.When the stitch space is larger than 08 mm,the DC resistance of embroidery transmission line tends to be stable and there are no obvious differences in reflection and transmission performance.When the stitch length is in the range of 1mm to 6mm,the DC resistance and electrical parameters at high frequency of embroidery transmission line decrease with the increase of the stitch length.At the range of stitch length between 3mm and 8mm,the reflection and transmission performance of the embroidery transmission lines are relatively stable.The embroidery tension has no distinct effect on the DC resistance and electrical parameters at high frequency of the embroidery transmission line;with the increase of the embroidery tension,the transmission properties of the embroidery transmission line is decreased,and the reflection properties is also better.Thus,the transmission line with smaller stitch spacing and larger stitch length has better transmission performance,but larger fluctuation as well.Meanwhile,the transmission line with smaller embroidery tension has better transmission performance.Thirdly,in order to do the research on the effect of the bending performance of embroidery transmission line,the DC resistance,impedance and S parameters of the transmission line under tension bending and extrusion bending are tested.The research is shown that the DC resistance and electrical parameters at high frequency of transmission line increase after bending while the effect of tension bending is larger.And the resonance frequency of the transmission line is increased from 472.2MHz to 477.4MHz(except the transmission line of 0.9mm-5mm),as well as the impedance matching frequency is increased from 217.7-219.7MHz to 235.5-237.9MHz.To sum up: the text studied on the transmission lines with different embroidery process parameters.Relevant researches have been finished on DC resistance,impedance,S parameters and bending performance.The result shown that Running stitch is more suitable for the production of transmission lines compared to Satin stitch and Tatamin stitch.The DC resistance of the transmission line decreases while the impedance increase with smaller stitch spacing,and the transmission and reflection performance are better,but the reflection fluctuates greatly.When the stitch length increases,DC resistance and electrical parameters at high frequency of embroidery transmission line decrease,as well as better transmission and reflection performance.The bending testing result demonstrated that the tension bending has a greater impact on the performance of the transmission line. |
PDF Full Text Request