请问如何测标签天线（RFID)？

标签天线封装好了，如何测试呢?有人说自己做一个螺旋状的发射天线，接在矢量网络分析仪上，可以扫描出标签天线的谐振频率，但螺旋发射天线本身也是有一个谐振频率的。如果把封装撕开，揭开胶封，里面是很薄的一层金属，但失网测试没什么反应。请问大家是如何测试标签天线的?包括谐振频率，阻抗。

要有发射天线和接收天线才行吧

there is a paper published in IEEE MTT Trans this May.

in addition, usually we estimate the performance of RFID antenna based on the reading range not impedance or gain. so it is better to use a chip and reader to test its maximum reading range in a chamber or real environment..

the performance of the RFID tag antennas is strongly affected by the object which is attached to.