Multiband combiner block is atten the signal for no reason.

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Fumihiko Sato
Fumihiko Sato 2024-11-13，19:39
Greeting.
I am trying to simulate the interference of 2 signal by combine them using "Multiband Combniner Block" in simulink. as below diagram
First signal is very narrow band signal (carrier ~1 kHz) (Primary signal)
Second signal is wide band sigal (Carrier ~250 kHz) (Interfere signal)
Anyway, the spectrum for both Primary signal and Interfere sigal looks ok (as screenshot below)
but when I look at the spectrum after "Multiband Combiner" block, seems the interfere signal got attenuation around 60-70 dB in the spectrum analyzer.
And from the block configuration, I don't see any related on atten the signal.
What is the possible cause that my intefere signal is being attenuate and how can I fix this?
Best Regads,
Fumihiko Sato

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