基于开槽和四合扣的频带扩展重构织物天线

A Textile Antenna with Expanded and Reconfigurable Band Based on Slot and Snap Buttons

织物半模衬底集成空腔天线适合作为可穿戴天线进行应用,但存在带宽小的缺点。在其结构基础上,提出了一款基于开槽和四合扣的频带扩展重构织物可穿戴天线。通过在顶面添加开槽的方法实现基模频带扩展,通过在辐射开口添加金属四合扣的方法实现频带重构。该天线在四合扣断开、闭合状态下分别覆盖不同的无线体域网频带,可动态覆盖相对带宽为17.5%的频率范围(2.27~2.71 GHz)。利用电脑缝纫技术制备了实物天线,通过仿真与实测验证了设计,分析了人体、柱面弯曲对天线性能的影响。

The textile half-mode substrate-integrated cavity antenna is suitable for wearable applications,but it has the disadvantage of small bandwidth.Based on its geometry,a textile wearable antenna with expanded and reconfigurable band based on slot and snap buttons is proposed.The band of the fundamental mode is expanded by adding a slot on the top layer,and can be reconfigured by adding metallic snap buttons at the radiation aperture.Different wireless body area network bands are covered by the proposed antenna with buttons in the OFF or ON state,and a frequency range with a fractional bandwidth of 17.5%(2.27~2.71 GHz)can be dynamically covered.A prototype antenna is fabricated using computerized embroidery.Simulations and measurements are carried out to verify the design and to analyze the influences of human body and bending conditions on antenna performances.