Best high frequency laminate [hlp]

it well depends on the frequency range ur filter will work in
also it will depend on the cost of the laminate , maythings


wish this help

khouly

I use laminate RO4003 from Rogers corporation for filters at 12 GHz

www.rogerscorporation.com

A good explination may be found on Laverghetta - Microwave materials...
Summarizing Laverghetta:
low loss laminates are divided into categories:
Hard (low rms surface roughness) - Soft PTFE based (higher roughness)
PTFE based are divided into:
Soft woven - Soft non-woven (microporous)
Soft low εr (i.e. 2-3) - mid εr (i.e. 6) - High εr (i.e. 10)
Soft tanδ at MHz -Soft tanδ at X band
Soft ED copper - Soft Rolled Copper
Soft low smoke - Soft not smoke specified
Soft dimensionally stable - Soft 100...200 ppm/°C
--
Generally all laminates are low loss. Loss is dominated by copper loss for freq.> few GHz.,

For filters, especially for narrow band, bandpass filter, both a good εr stability and a good diminsional stability over temperature is stongly required. Also the accurate knowlegde of εr and H dimension and associated uncertainties are important.

So, for my opinion, the preferred materials are:
Hard: 99.8% polished Alumina (Al2O3)
Soft: Rogers RT6002

Hello
I'have used RF35 (similar to RO4003) for a filter on 6 GHz band and works quite well

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