Frank Hinojos wrote: Gnd Vias every 1/20 wavelength is also important. Shielding & Proximity is important for susceptibility on layout on signals. eg 1.5GHz LO VCO input. I am also involved in the design of RF circuit boards and have had engineers insist on this type of ground connections with out a good explanation of the electrical or physical characteristics that drive this need. Could you elaborate on the 1/20 wavelength rule? Our operating frequencies are between 1040 MHz and 1090 MHz if this is necessary for explanation. Thank you in advance. Jeffrey McGlaughlin BFGoodrich Avionics Systems Inc. 1105 Schrock Road Suite 800 Columbus Ohio 43229-1174 [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************