Near-field communication antenna using a metal rear cover

The invention provides a near-field communication antenna using a metal rear cover and belongs to the technical field of antennas. The antenna device of the present invention includes a coiled metal conductor, a first metal housing and a second metal housing that are separated by a slit, and a metal conductor layer inside a communication device. The reverse induced eddy current in most areas of the metal housing is eliminated by the connection of both ends of the coiled metal conductor and the second metal housing and the relative positions of the coiled metal conductor and the first metal housing, thereby reducing losses and improving antenna performance. The antenna has the advantages of small area, low influence on other antennas in the communication device, simple structure, easy processing, low cost and superior performance. 本发明提供了种利用金属后盖的近场通讯天线，属于天线技术领域。本发明所述天线装置包括卷曲环绕的金属导体、被缝隙分开的第金属壳体以及第二金属壳体和通讯设备内部的金属导体层。通过卷曲环绕的金属导体两端与第二金属壳体的相连以及卷曲环绕的金属导体与第金属壳体的相对位置消除了金属壳体大部分面积的反向感应涡流，从而减小损耗，提升天线性能。本发明提供的天线具有面积小，对通讯设备