how to know what type of PCB/substrate is
how to know what type of PCB/substrate is
(OP)
hi,
I have an LNA for a 2.2GHz application. I would like to know what type of PCB/substrate uses. Is there any way to know, measure for example dielectric contant.....
Thanks.
I have an LNA for a 2.2GHz application. I would like to know what type of PCB/substrate uses. Is there any way to know, measure for example dielectric contant.....
Thanks.





RE: how to know what type of PCB/substrate is
Ask the manufacturer.
Also, Google FR4 and click images on google.
If no luck, Google or check Rogers Corp and Taconic, get pics of their stuff, you'll probably recognize it.
You can measure it's dielectric properties, but it can be awkward and inaccurate.
RE: how to know what type of PCB/substrate is
Now, if it's for a bottom-end consumer throw-away made as cheaply as possible in high volume out of China, it might be made out of phenolic. Yes, I've seen ultra-cheap low GHz range done in phenolic. Color is generally brown to dark brown.
Now, if the board was made for high-end test equipment, high performance/low noise, or higher temperature application it could be one of a variety of teflon substrates - but this is rare. You will also find teflon (or some Rogers equivalent) in some TV satellite dish antenna LNAs. Color is generally tan to white.
RE: how to know what type of PCB/substrate is
NF specification for SDARS SIRIUS is 09dB. Frequency band is 2320 to 2332MHz and 32 dB gain .
Do you think it is possible to obtain that with FR-4.
RE: how to know what type of PCB/substrate is
Take note if this is the green look of the board, you may need to scrape off the top solder mask with a dremel tool or exacto knife to actually see the board underneath.
RE: how to know what type of PCB/substrate is
I looked at the edge of the PCB and it is dark, not white as Rogers material.
RE: how to know what type of PCB/substrate is
FR4 has is typically a dark green.
Rogers makes an FR4 equivalent called 4003, which is much cheaper than their higher frequency boards.
My guess is your board is Rogers 4003.
RE: how to know what type of PCB/substrate is
I'll find out more information about Rogers 4003.
I attach a pic of the amplifier.
RE: how to know what type of PCB/substrate is