I would like any responses to be off-line for the following discussion. Please use the following email address: [log in to unmask] I made a simple mathematical model of a stripline, 1 inch trace, on FR-4, nothing out of the ordinary as far as dimensions and found to my surprise a resonant freq at about 800 MHz with a 20 to 40 dB roll-off above 800 MHz Could someone in the RF/Microwave world of nuts and bolts pc board design tell me what I'm supposed to do at say 10 GHz with regular pc board materials/construction/fabrication??? Thanks in advance, Doug McKean