Problem with coupled port in hybrid coupler design

I was designing a hybrid coupler with Microwave office and i saw that the transmission port and the coupled port have at central frequency 90degree and 0degree (s21 phase). So for the coupled port it seems there is a lead: it is a bug or i can set some options to see the real delay? You can check this simply putting a ideal hybrid coupler with 4 port and displaying the phase of the s21
thanks
regards

Hello,

What exactly do you mean Real Delay?
Is the attached one do you referring in MWO?

Quadrature Hybrid (Closed Form): QHYB
This is an ideal behaviral model...

So you need to use the physical based model
Microstrip Branch-Line Coupler (Aggregate): MBLCOUP



---manju---

Thank you for the reply.
The hybrid coupler is coupled line (lets say a broadside coupler) and i saw this behaviour so i used the ideal hybrid to check the behaviour.
The real delay: a positive phase means a lead in the signal at the coupled port i suppose.
thanks