ZincBear
Joined: 19 Aug 2005
Posts: 24
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 06 Aug 2008 4:14 Unknown Resonances in HFSS Simulations at 70GHz...Help... |
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Dear all,
I am having trouble simulating a simple 50ohm microstrip line above 60GHz. While circuit simulators such as AWR and ADS gives a smooth curve, and good return loss of -15dB up to frequencies of 200GHz, HFSS is giving me wierd spikes and resonances at about 70Ghz (shown in attached file). Is there some setup that i did wrongly?...
The parameters of the Microstrip line is as follows:
- 3mil thick GaAs
- 20mil long
- 2.2mil wide
Simulation Parameters as follows:
- lumped port1 and port2
- solution frequency = 150GHz
- sweep range = 1-100GHz in 1Ghz step
- Max number of passes = 20
- Max delta S per pass = 0.02
- Lambda Refinement Target of 0.3333, use free space lambda ticked
- Refinement per pass = 20%
- Minimum number of passes = 1
- Minimum Converged passes = 1
- Port field accuracy = 1%
- Automatically set Min/Max Triangles ticked
Pls kindly advise...Thank you very much...[/img]
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