Clear, thank you for your info.
Op 10-2-2021 om 10:31 schreef Kerry:
toggle quoted message
Show quoted text
These couplers are not directional; in/out can be at either end.
30dB is a practical coupling factor.
Coupling is proportional to turns ratio (the through-line is one turn).
For 1000:1 (30dB) impedance ratio, the turns ratio is 1:sqrt 1000, ie 1:31.6; in practice, of course, 1:32 serves.
For 1:100 (20dB impedance ratio), the turns ratio is 1:sqrt 100, ie 1:10, so 10 turns can be used.
If you do this arithmetic for other ratios you will find that most of them are impractical; about 10 -25dB ratio is the practical limit.
At first glance it might seem that more turns are required for more output to the Cpl port but that's not the way that current transformers operate.
