Hi all,

I am new in uWave field. Shall I know how to measure full 4 port dual directional Coupler with PNA? I am of interest to measure directivity, source match, etc. However, i do not know how to start.

I am new in uWave field. Shall I know how to measure full 4 port dual directional Coupler with PNA? I am of interest to measure directivity, source match, etc. However, i do not know how to start.

Match is easy, it is the return loss (S11 or S22 if the through ports are connected to 1 and 2).

Directivity is a little bit more tricky. By definition, the directivity is the isolation divided by the product of coupling and insertion loss:

D=I/(C*R). You can use the new equation editor on a trace to compute it directly. Assume that port 3 is the load port and port 4 is the coupling port. then you can write the equation:

Direct=S31/(S21*S41).