A circuit substrate in which the conductor portions constituting the functional devices formed in the insulating board have interfacial electric conductivities .sigma. of not larger than 2.90.times.10.sup.7 .OMEGA..sup.-1.multidot.m.sup.-1 to greatly lower the insertion losses.

Un substrat de circuit en lequel le conducteur partage la constitution les dispositifs fonctionnels formés dans le conseil isolant ont le sigma électrique dièdre de conductivités. de non plus grand que l'Ocméga..sup.-1.multidot.m.sup.-1 2.90.times.10.sup.7 abaissez considérablement les pertes d'insertion.

 
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