Imaginary part of impedance appears negative when using Multiple coupled inductors

[sm3909]

When using two coupled inductors, the Imaginary part of input impedance appears positive as expected. However, when using the same circuit using four coupled inductors, he Imaginary part of input impedance appears negative (third and fourth inductors effectively open circuited. by high resistances).

[felix-salfelder]

On Mon, Jun 19, 2023 at 12:37:17PM -0700, sm3909 wrote: When using two coupled inductors, the Imaginary part of input impedance appears positive as expected. However, when using the same circuit using four coupled inductors, he Imaginary part of input impedance appears **negative** (third and fourth inductors effectively open circuited. by high resistances).

Sounds like a Qucsator or model bug. This is difficult to reproduce without the circuit. Please provide a complete and minimal test case ("netlist.txt"), and the output ("qucsator -i netlist.txt").