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#1
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How do you make RF circuit boards?
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In article , wrote: Sometimes, at work, I need to make, or have made, an RF PCB board to test an RF part. For example, a surface mount 2-way power divider, up to say 4 GHz. We have regular g10? copper clad, a PCB millimg machine. Is a 50 ohms trace about .1 in wide in this material? What is advantage of FR and Duriod? Is TXLINE a good program to determine trace widths? Any good books on RF boards? Any tips would be very appriciated. I use APPCAD (free) to calculate line widths & impedances: http://www.hp.woodshot.com/appcad/appcad.htm For a given dielectric & impedance, the ratio of line width to thickness is constant, so thinner boards mean thinner lines for a given impedance. A 1/16" G-10 board requires about 110 mils of width for 50 Ohms. G10/FR4 is OK up to several GHz, but it begins to get lossy and the impedance won't be as tightly controlled as with a "real" RF board material. It's OK to get a signal from A to B, but it ins't good for filters. Doug White |
#2
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How do you make RF circuit boards?
Sometimes, at work, I need to make, or have made, an RF PCB board to
test an RF part. For example, a surface mount 2-way power divider, up to say 4 GHz. We have regular g10? copper clad, a PCB millimg machine. Is a 50 ohms trace about .1 in wide in this material? What is advantage of FR and Duriod? Is TXLINE a good program to determine trace widths? Any good books on RF boards? Any tips would be very appriciated. |
#3
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How do you make RF circuit boards?
If you know the Er (dielectric constant), and the thickness if the
substrate, here is a nice website to calculate microstrip impedance... http://www.microwaves101.com/encyclopedia/calmstrip.cfm FR is basically just G-10 but fire retardant. G-10 is generally considered OK up to about 1 GHz. Duroid has a higher Er and thus thinner boards can be used and this will make a 50 Ohm line narrower and reduce the line's radiation. Scott N0EDV wrote: Sometimes, at work, I need to make, or have made, an RF PCB board to test an RF part. For example, a surface mount 2-way power divider, up to say 4 GHz. We have regular g10? copper clad, a PCB millimg machine. Is a 50 ohms trace about .1 in wide in this material? What is advantage of FR and Duriod? Is TXLINE a good program to determine trace widths? Any good books on RF boards? Any tips would be very appriciated. -- Scott http://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version) |
#4
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How do you make RF circuit boards?
"Doug White" schrieb im Newsbeitrag ... I use APPCAD (free) to calculate line widths & impedances: http://www.hp.woodshot.com/appcad/appcad.htm Take the newer one at: http://www.hp.woodshot.com/appcad/version302/setup.exe Regards, Ralf, DL2MRB |
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