Question on pcb material selection.

[syncmaster]

I want to know what kind of pcb material can operate at such high frequency up to 60Ghz, can RT-Duroid 5880 fit this need? and what about the thickness? I am new to design high frequency circuit up tp 60 GHz, and I need your help.

Thank you

 

[lguancho]

My 2 cents opinion. For 60 GHz frequency, probably you are looking for low Er (also low loss) substrate, such as Roger 5880, 10 mil thickness. This give you realizeable circuit size at 60 GHz

 

[sergio mariotti]

Some years ago i've compared most of the microwave laminates.
Generally speaking all laminates are low loss material. Probably Rogers 5880 is the lowest loss.
But take in account some pratical considerations.
60 Ghz circuit may be very small, and 5880 is one of the softest material. It tend to be similar to the plaster and the copper line tend to "float" over the dielectric . This reflect on the mechanical accuracy.
Using a rigid material, you can get higher mechanical accuracy, but often they have larger er.
Try PFTE loaded with fiberglass (Taconic TLY...).
Useful info may got on Laverghetta-Stripline circuit Design.

 

[plasma]

look at http://www.rogerscorporation.com/acm/LCPINDEX_2.htm
for R/flex® 3000 Series Liquid Crystalline Polymer (LCP) Circuit Material
and R/flex® 6000
its a new I think you can use it.