pnayak1
Joined: 04 Nov 2009
Posts: 1
Location: ASU, Tempe, AZ
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 04 Nov 2009 23:51 How to decide Waveport size of a CPW and Batch mode in HFSS |
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Hello,
I am new to HFSS, I am using HFSS v11.2 on Windows XP. I am trying to design a CPW with 50 ohm char impedance within a frequency range of 1GHz to 100GHz. Ultimate aim is to make the onwafer calibration structures for TRL measurements at various freqs. The substrate resistivity is 0.1 MΩ and thickness is 725µm, there is an Oxide coating on top of it with thickness = 145nm. The CPW is on top of this oxide layer. It is a Ground Signal Ground confign, All lines are 1µm thick. I am using half of the structure (i.e one Ground line and half the width of the signal line) with PerfH on all sides and targeting 100Ω (so that the full structure gives 50Ω). I am running a freq sweep from 1 GHz to 100 GHz with 10 step increment. The substrate size is 1mmx2mm and the airbox is 1mmx1mmx10mm. I am varying the gap between G and S and the width of the lines to achieve 100Ω for half structure for all freqs in 1GHz to 100 GHz range.
1. I am not sure what is the optimum size of the waveport. Whether I should use a large waveport with Height=4mm and width=2mm or a smaller waveport with H=500µ and W=300µ. How do I decide the optimum size of the waveport?
2. Is there anyway I can run HFSS in batch mode, so that it runs for different combinations of Width of the lines and the gap between them and store the results in separate files which I can analyze later. Instead of manually changing the line widths and gap and waiting for 1hr for the sweep to get over.
I have attached my HFSS file. It will be very helpful if I can get an early response.
Thank You for your time,
Pinak
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