When looking the load match error, two option are available load match (1,2) and (2,1). I know the order in which the numbers are arrange determines signal path direction. I assume that (1,2) is from PORT 1 to PORT 2. Is this correct.

When looking the load match error, two option are available load match (1,2) and (2,1). I know the order in which the numbers are arrange determines signal path direction. I assume that (1,2) is from PORT 1 to PORT 2. Is this correct.

Load match (1,2) is the load match at port 1 with source at port 2, thus, the reverse load match. This is the same as S12, which is gain with source at port 2, load at port 1.