PCB substrate material for 20W RFPA

My RFPA's bandwidth is from 10MHz to 1GHz at 20W. I'm using Roger RO4350 with aluminum plate attached to the bottom of the PCB for initial design but now I want to change PCB substrate to different material i.e. Isola FR406 due to cost constrain (was quoted S20 a piece RO4350B material for quantity of 150s). I'm concern that their er spec fluctuates widely and not even sure about batch to batch consistency. What is your advise in term of PCB substrate and thickness (thinner the PCB the higher the cost) for this type product?

Thank you in advance.
Lanny

Isola FR406 is a good material and it will work fine for this frequency range.
Thicker substrate behave better over higher temperature and power dissipation.

Is there any equivalent option to FR406? I have a hard time to get a sample. I have talked to the OEM rep and he promised to send me some samples. That was a couple days after above my post. Then there is a salesperson called and no follow through. I don't need any freebies and just want to buy some samples to check it out and the distributors wanted a few hundred panels to start with. The PCB fab rep can't get me any but direct me to Isola. It starts getting ridiculous the way this company operated. I only deal with Arlon & Roger before and they are nowhere close to this bureaucratic incompetency.

Have you seen the (Park Electrochemical Corp.) Nelco N4000 family of board substrates? One of our cost-conscious customers fabricated 2.3 and 2.6 GHz RF boards (for WiMAX and other OFDM uWave systems) using that particular blend of FR4 material. I notice also that a few board fabrication houses offer the N4000 and variations as their substrate material.

Nelco High Speed Digital PCB and Electronic Materials


One fabricator's offering including the N4000 family:

Circuit Express : Time Critical PCB Solutions


Jim

Thank you Jim. I'm taking a look at it.