Rogers is of course better but more expensive.If your operating frequency is not too high ( up to 1-2GHz), FR-4 can also be used.
But Rogers has always lower loss than FR-4..
FR4 has higher permittivity, so the divider will be smaller than the RT5880 version.
RT5880 has lower loss, but also low permittivity, so the divider will be larger than the FR4 version.
RT5880 is teflon based - special manufacturing required - expensive.
There are other substrates that have high permittivity and low loss and cost effective manufacturing, for example Rogers RO4360G2 (er=6.15, tand=0.003)
hi shilpa.k
currently am designing a 4-way power divider with its frequency range 2~3Ghz.firstly i used FR-4(Er=4.4,H=1.6mm),but i can not get correct index,S21 is too weak,since the TanD is about 0.02 for FR4.its loss is very big.if ur work frequency is more rhan 3Ghz,u should not use FR4,beacause its Er will change(is not 4.4)
Thank u
My wilkinson power dividers are for 1.8&2.6 GHz..i hve designed them using RT5880... But m unavailable to obtain d substrate now...so was thinking of variation if any