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HFSS, changing port impedance changes convergence

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hermit

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Hi all,

Newbee, first post, and still learning the rules and etiquette of this place. Be easy, k.

Here's the synopsis: I'm running an HFSS driven terminal solution. The design is a spiral transformer--a single loop primary around a flat archemedean spiral of a few turns.

I've read in various places that specifying port impedance does not effect adaptive analysis, but have much evidence to the contrary. I ran my simulation with 50 Ohm Z_0 and it converged in 5 passes with something like 90,000 tets. Then I tried changing Z_0. I made it some thing like 0.01 - j360 Ohms. This didn't converge after 16 passes and generated 1B tets (billion).

I find this to be a trend in my simulation. The lower I make the output impedance (at least the real part) the more difficult the convergence. Just to add a few notes: the primary loop (where my port is located) is a perfect conductor with a ~10cm radius and the solution freq is ~150MHz. My motivation for selecting the output impedance (specifically to add capacitance) is to get the primary coil to resonate at a specific frequency (related to secondary coil, similar to Tesla coil operation).

Any insight is highly regarded. Let me know if I should provide more info with this query.

Regards,

Herman
 

thanks, for the interest. I'm having trouble uploading the .hfss file. Let me know if you're having trouble with file dl.

Note: using HFSS 64 bit version on Windows.
 

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  • WPT_small_2 - Copy.zip
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