ads hfss co-simulation

A question on the co-simulation by ADS and HFSS of DRO.

I am working on a DIELECTRIC RESONATOR OSCILLATOR(DRO) at 5.8GHz.
And I plan to simulate the DR structure with Ansoft HFSS to get the S2P file,
and then import it to Agilent ADS to co-simulate with the transistor.
However, simulation results show that the loop gain is less than 1, which means that the circuit cannot oscillate.
Actually, experimental results show that it oscillates quite well, and the output power is between -1dBm and 0dBm.
Could anyone tell me the reason why the simulation does not coincide with the experiment?
Thanks very much!

Attachment--
See
https://www.edaboard.com/viewtopic.p...023965#1023965
Figure 1--ADS Schematic
Figure 2--Loop Gain, Note that the loop gain is quite near 1(more than 0.99), and the phase is close to 0.

Please forgive me for my poor English! I am from Chinese.

good way.

I think HFSS or CST for DR model as S2p,then use ADS for simulated.

But by the way, how to use the ADS DR mode for DRO simulate?

why not try the Ansoft Designer instead of the ADS? I think there is a good link between the Ansoft Designer and HFSS.

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