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RF trace simulation in ADS

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1 year 11 months ago #448 by Giftina
Giftina replied the topic: RF trace simulation in ADS
Thank you Dave for the link. The dielectric constant is 3.1 and the length of the trace is 42 mm. The maximum via seperation that the board fabricator can provide is 0.4mm.

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1 year 11 months ago - 1 year 11 months ago #470 by Microwaves101
Microwaves101 replied the topic: RF trace simulation in ADS
A long line that is mismatched will have a periodic response in S11, lots of dips and valleys. If you just look at one frequency you will have no idea what is going on. If you plot the trace across frequency and look at the maxima (-6 dB or whatever), then subtract 6 dB from that number (-12 dB in my example) that is the return loss that matters. The dips are caused by constructive interference due to the two mismatches, one at each end.

I hope I didn't misunderstand the question...

Steve
Last Edit: 1 year 11 months ago by Microwaves101.

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