series
The U3401A is a Vector Network Analyzer (VNA) from the Agilent Technologies (now Keysight) N5247A series. This device is a two-port VNA with broad dynamic range and high accuracy. It can be used to characterize many types of electronic components and systems, including antenas, couplers, filters, and amplifiers. The U3401A is a full two-port network analyzer, measuring S11 and S22 reflection coefficients, and S21, S12 and S22 transmission coefficients. Its maximum theoretical dynamic range reaches 95 dB, and RF output power is up to +20 dBm. It provides a measurement speed as fast as 100 ms, with a frequency range from 10 Hz to 4 GHz, and 113 different S-parameter measurements (S11,S21,S12,S22) can be taking over the full frequency range.