A Twin Spiral Planar Antenna for UWB Medical Radars
A Twin Spiral Planar Antenna for UWB Medical Radars
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DOI：
10.1155/2013/684185
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发表时间：
2013-01
影响因子：
1.5
通讯作者：
G. Zito;E. Staderini;S. Pisa
中科院分区：
文献类型：
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作者：
G. Zito;E. Staderini;S. Pisa
提出了一种用于心脏活动监测的超宽带（UWB）雷达系统的平面螺旋天线。该天线由两个螺旋振子组成，结构紧凑，被称为“孪生天线”。偶极子馈电点的反射系数在3-12 GHz频段内低于−8 dB，而双偶极子耦合约为−20 dB。辐射波束垂直于螺旋的平面，因此天线是可穿戴的，并且它可能是用于心率检测的医疗UWB雷达的最佳辐射器。所设计的天线也已被用来检查UWB雷达心脏活动检测机制的一些假设。辐射阻抗的变化，所造成的胸部振动与心脏活动，似乎是最有可能的解释UWB雷达操作。
A planar-spiral antenna to be used in an ultrawideband (UWB) radar system for heart activity monitoring is presented. The antenna, named “twin,” is constituted by two spiral dipoles in a compact structure. The reflection coefficient at the feed point of the dipoles is lower than −8 dB over the 3–12 GHz band, while the two-dipoles coupling is about −20 dB. The radiated beam is perpendicular to the plane of the spiral, so the antenna is wearable and it may be an optimal radiator for a medical UWB radar for heart rate detection. The designed antenna has been also used to check some hypotheses about the UWB radar heart activity detection mechanism. The radiation impedance variation, caused by the thorax vibrations associated with heart activity, seems to be the most likely explanation of the UWB radar operation.