Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Gap between the stripline trace and ground trace
Thu Jan 20, 2005 6:31 am
I understand from the replies that I got for my posting on 14th of Jan that the
rule of thumb that I am following on the gap between the microstrip trace and ground trace is acceptable. For
reference, I am repeating below the lines I had posted.
[If 'W' is the width of the microstrip line,
maintaining a gap of 'W' between the microstrip line and ground trace/plane next to it on the same layer is
considered as good RF practice. Am I right on this thumb rule? ]
Now, I would like to know if the above
rule of thumb holds good for stripline as well. Have in mind that the width of stripline is almost five times
lesser compared to microstripline for given substrate and charecteristic impedance. For 50 ohms line impedance and
Rogers RO4003C, trace width for microstrip is 44 mils and for stripline it is around 9 mils.
Post subject: Rule of thumb
Unread postPosted: Fri Jan 21, 2005 9:05 am
You can save
yourself a lot of time and aggrevation by going on the microwave office website and downloading their "free"
transmission line calculator.
Post subject: Re: Gap between the stripline
trace and ground trace
Unread postPosted: Fri Jul 01, 2005 11:31 am
The rules of thumb I use for RO4003
is to use a dielectric constant of 3.6 when calculating coplanar waveguide etc. and use APPCad (Free) from
I have produced boards with runs up to 18"long, going through blind vias that are "flat" to about
10GHz and -3db at 14GHz. Also for coplarnar wave guide, you must take into account ground planes and core
thickness. Get the program and don't putz around with rules of thumb with 4003 there really are none except for
the adjustment of the constant,(which came from a Rogers Application Engineer).
Unread postPosted: Fri Jul 01, 2005 1:05 pm
Joined: Mon Jun 27, 2005 2:02 pm
This is what that programs are made up
for, to provide you with the exact dimensions of the transmission lines and required gaps. Use these tools and you
will save yourself an unneccessary spin of PCB layout.