一种可用于体域网的小型化超宽带天线设计

基于FR4环氧板,设计了一种可用于体域网的非对称共面波导馈电的超宽带天线。该天线由Y型贴片、梯形地板和三叉戟共面馈线组成。Y型贴片、圆形贴片、三角形贴片实现4~5 GHz的中低频处带宽小于-10 d B的效果,梯形地板和三叉戟共面馈线实现7~14 GHz的高频处带宽小于-10 d B的效果。该天线采用非对称共面波导的馈电方式,具有良好的共面性与高度的集成性,使得天线的总体尺寸更小,辐射贴片的面积为22 mm×21 mm。与以往的小型化超宽带天线相比,该天线具有尺寸更小、带宽更宽的优势。经网络矢量分析仪测试结果表明,该天线在2. 14~11. 32 GHz的超宽带频段内回波损耗小于-10 d B(相对带宽为136. 4%),可适用于2. 4/5. 2/5. 8 GHz无线局域网、3. 5/5. 5 GHz WiMAX、LTE频段38和LTE频段40。同时,该天线距离人体大于5 mm时的比吸收率(SAR)小于2 W/kg,满足国际标准。

Design of a miniaturized UWB antenna for wireless body area network

A miniaturized UWB antenna fed by asymmetric coplanar waveguide was designed for WBAN.The antenna was printed on FR4 epoxy board.The antenna was constituted with Y-patch,trapezoid coplanar ground and trident coplanar feeder.By adding Y-patch,circular patch and triangular patch,the bandwidth at middle and low frequencies of 4-5 GHz is less than-10 dB.By adding trapezoidal floor and trident coplanar feeder,the bandwidth at high frequencies of 7-14 GHz is less than-10 dB.The antenna was fed by asymmetric coplanar waveguide,which has good coplanarity and high integration capability.As a result,the overall size of the antenna is smaller,and the area of the radiation patch is 22 mm×21 mm.Compared with the previous miniaturized UWB antenna,this antenna has the advantages of smaller size and wider bandwidth.The measurement results show that the return loss of antenna is lower than-10 dB in 2.14-11.32 GHz(relative bandwidth is 136.4%).It can be applied to 2.4/5.2/5.8 GHz WLAN,3.5/5.5 GHz WiMAX,LTE band 38 and LTE band 40.At the same time,the specific absorption ratio(SAR)of the antenna is less than 2 W/kg,which meets the international standards.