You should look up IPC-2141. _______________________________________________________________________________ Subject: RF Design - Plating and Routing From: [log in to unmask] at CCGATE Date: 6/24/97 3:08 PM I have just recently taken a job at a company primarily doing RF designs. I won't ask anything ridiculous like "How do I design for RF?" but I have two simple questions: In the past I have always called out "Soldercoat all exposed copper..." on the fab dwg, but here they are using tin plating. What is the difference between tin plate and soldercoat? Many of the RF designs here were done in AutoCAD, and the only reason I have been given for this was that it was easier to chamfer the corners of the delay lines (fairly wide 50 ohm traces on 20mil teflon). I may be wrongly assuming that the reason for the chamfer was to minimize the effect of the impedance change "around the corner", but my new CAD package can do curved traces which suggests NO mismatch around bends... constant width everywhere, right? Unfortunately, no one here has any data to support the need for chamfers. (I have to painstakingly enter precise polygons if chamfers are really required, so I would rather avoid it). We are working with 1.9GHz, and are moving to Rogers 4003 material. Can anyone with RF experience comment on this? in the dark.... jack, the new guy *************************************************************************** * The mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text.* *************************************************************************** * If you are having a problem with the DesignerCouncil, please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** The following is an attached File item from cc:Mail. It contains information that had to be encoded to ensure successful transmission through various mail systems. To decode the file use the UUDECODE program. --------------------------------- Cut Here --------------------------------- begin 644 rfc822.txt M4F5C96EV960Z(&)Y(&-C;6%I;"!F<F]M(&9W+65S,#4N:&%C+F-O;0T*1G)O M;2!$97-I9VYE<D-O=6YC:6PM<F5Q=65S=$!I<&,N;W)G#0I8+45N=F5L;W!E M+49R;VTZ($1E<VEG;F5R0V]U;F-I;"UR97%U97-T0&EP8RYO<F<-"E)E8V5I M=F5D.B!F<F]M('-I;6]N+FEP8RYO<F<@*%LR,#DN-#(N,CDN,UTI#0H@("`@ M("`@("`@8GD@9G<M97,P-2YH86,N8V]M("@X+C@N-"\X+C@N-"D@=VET:"!3 M3510#0H@("`@("!I9"!004$P-#DX,CL@5'5E+"`R-"!*=6X@,3DY-R`Q-3HP M,SHQ,B`M,#<P,"`H4$14*0T*4F5C96EV960Z(&9R;VT@:7!C+F]R9R!B>2!S M:6UO;BYI<&,N;W)G('9I82!33510("@Y-#`X,38N4T=)+C@N-BXY+SDT,#0P M-BY31TDI#0H@("`@(&ED(%%!03`R,3(P.R!4=64L(#(T($IU;B`Q.3DW(#$V M.C,W.C`X("TP-S`P#0I297-E;G0M1&%T93H@5'5E+"`R-"!*=6X@,3DY-R`Q M-CHS-SHP."`M,#<P,`T*4F5C96EV960Z(&)Y(&EP8RYO<F<@*%-M86EL,RXQ M+C(X+C$@(S(I#0H@("`@:60@;3!W9UA10RTP,#!";31#.R!4=64L(#(T($IU M;B`Y-R`Q,#HR,B!#1%0-"E)E<V5N="U396YD97(Z($1E<VEG;F5R0V]U;F-I M;"UR97%U97-T0&EP8RYO<F<-"D]L9"U2971U<FXM4&%T:#H@/&IO;'-O;D!C M<&%L+F-O;3X-"DUE<W-A9V4M240Z(#PS,T%&13DR-BXU,34W0&-P86PN8V]M M/@T*1&%T93H@5'5E+"`R-"!*=6X@,3DY-R`P.#HS-3HP,B`M,#<P,`T*1G)O M;3H@2F%C:R!/;'-O;B`\:F]L<V]N0&-P86PN8V]M/@T*6"U-86EL97(Z($UO M>FEL;&$@,RXP,4=O;&0@*%=I;CDU.R!)*0T*34E-12U697)S:6]N.B`Q+C`- M"E1O.B!$97-I9VYE<D-O=6YC:6Q`:7!C+F]R9PT*0T,Z(&5D85]U<V5R<T!A M8V-E;'1E8V@N8V]M+"!P8V%D=7-E<G-`86-C96QT96-H+F-O;0T*4W5B:F5C M=#H@4D8@1&5S:6=N("T@4&QA=&EN9R!A;F0@4F]U=&EN9PT*0V]N=&5N="U4 M>7!E.B!T97AT+W!L86EN.R!C:&%R<V5T/75S+6%S8VEI#0I#;VYT96YT+51R M86YS9F5R+45N8V]D:6YG.B`W8FET#0I297-E;G0M365S<V%G92U)1#H@/"(T M,&U&2"XP+F5-.2YH3RUH<")`:7!C/@T*4F5S96YT+49R;VTZ($1E<VEG;F5R M0V]U;F-I;$!I<&,N;W)G#0I8+4UA:6QI;F<M3&ES=#H@/$1E<VEG;F5R0V]U M;F-I;$!I<&,N;W)G/B!A<F-H:79E+VQA=&5S="\R-3`V#0I8+4QO;W`Z($1E M<VEG;F5R0V]U;F-I;$!I<&,N;W)G#0I0<F5C961E;F-E.B!L:7-T#0I297-E L;G0M4V5N9&5R.B!$97-I9VYE<D-O=6YC:6PM<F5Q=65S=$!I<&,N;W)G#0H` end *************************************************************************** * The mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text.* *************************************************************************** * If you are having a problem with the DesignerCouncil, please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************