Agilent 2-port PNA-L Network Analyzer
It is a versatile instrument that can be used to measure reflection and transmission coefficients. From the reflection measurement we can compute the input impedance of RFID tag and reader antennas. Transmission coefficient is used to assess the quality of air link between the tag and the reader, especially useful to compare the performance of different tags, assess the effect of environment on the performance of the RFID system, etc.