中文摘要：

为使标签可以对任意材料物品进行标识,且使天线具有较高的增益,设计了一种新的具有普适性的特高频（UHF）射频识别（RFID）标签天线.该天线由一对1/4波长的矩形贴片构成类偶极子辐射体,通过悬浮于其上层的环形走线进行感性耦合馈电,实现与RFID标签芯片的共轭匹配.实验结果表明：该天线适用于全球范围的射频识别系统（840～960 MHz）,贴附于不同材料表面上时均有2.0 d Bi左右的增益,获得稳定的识别距离;当标签贴附于衣服、图书等介质材料上时,天线可获得全向的辐射方向图;当标签贴附于良导体表面时,天线可获得垂直于导体表面的半功率角为70°的方向性辐射方向图.

英文摘要：

In order to implement stable identification of objects with different materials,a novel UHF（ Ultrahigh Frequency） RFID（ Radio Frequency Identification） tag antenna with steady and high gain is proposed. The antenna consists of a pair of quarter-wavelength rectangular patch working as a radiation unit of dipole antenna and an inductive feeding loop suspending on the patch plane. Thanks to the significant induction introduced by the loop,conjugate matching to chip impedance can be achieved. Experimental results show that the proposed tag antenna covers the worldwide RFID bands in UHF range（ 840 ～ 960 MHz） and helps obtain a gain of about 2. 0 d Bi as well as a stable recognition distance for different dielectric materials. Moreover,it is found that,when the tag antenna is mounted on such dielectric materials as clothes and books,the radiation pattern shows omnidirectional;while when it is mounted on conductors with consistent gain,the radiation pattern shows directional with a half power beamwidth of 70°.