Re: how to simulate quality factor of an spiral inductor in
You have a model for spiral inductor under lumped components pallete, and a choice of them in TLINE microstrip pallete. You can work with them in your circuit unless you wont to know exactly and in advance the Q of your inductor. They include loss calculation. You can calculate Q factor as stated above in previous mail. However, when you put your inductor between two ports, you are determining the loaded Q, it should be re-calculated to unloaded (inductor itself is loaded with 50 ohm port impedance, this is not true Q).
There is another method to determine unloaded Q directly - from short circuted inductor (one inductor terminal to ground, the other to 50 OHm port termination), and unloaded Q is determined from reflection.
flyhigh