[SI-LIST] Re: Conductor loss reduction at High Frequency

  • From: "Kevin G. Rhoads" <kgrhoads@xxxxxxxxxxxx>
  • Date: Wed, 29 Aug 2007 20:55:33 +0000

>Silver is best, as is well known, but only about 4-5% better than copper.

Unless you can afford to chill to superconducting; but the high temp 
superconductors are all ceramics and don't plate well, and even liquid
nitrogen temps are expensive to achieve.  

As for the metallic superconductors, liquid helium temps are MUCH
more expensive, and it is hard to get semiconductors that are happy
at those temps.

SO, yes, silver plate is the best you can ordinarily do for HF conductors,
and can but you a little if the plating depth is greater than a skin depth
or three -- but silver tarnishes easily, and you are more likely to get
better bang for your buck by concentrating on other kinds of loss that
are more readily controlled.
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