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RF PCB Material Selection

wendydu

Does anybody can give some RF PCB material selection guide?

Or maybe give us the tips about how to choose the PCB material while we design RF board?

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  • For most 2.5 GHz or below wireless RF designs we just use FR-4. If the board gets big and loss gets really important then you can get better specified FR4 like the stuff from Isola.

     

    The trick is the layer stackup. For multilayer boards you need to specify the layer stackup carefully as the space between the layers and traces sets the impedance of the traces.

     

    I regularly use simple low cost boards for RF to 2.5 GHz, especially on low cost wireless designs. (I'd probably also use FR-4 for a 5 GHz wireless LAN design too as the RF portion of these things is quite small).

     

    It would help to know what you are trying to do / design so that a better recomendation can be made.

     

    HTH - Steve H.

  • in reply to SteveH

    Hi Steve,

    thank you for your helpful reply.

    I would like to make a SWR meter working on 2.45 GHz with a 50 Ohm track designed on a PCB.

    Do you think that the FR-4 PCB could fit this requirement ?

    There is a "Epoxyd hard fibre FR4" for sale in FARNELL manufactured by "ROTH ELEKTRONIK" under "RE1001-LF" reference.

    Do you know where I could find the exact drawing to make such 50 Ohm coupled tracks on the FR-4 PCB ?

    I have  a 2.4 Ghz generator with a 2W output RF power and I would like to use this device to check a microwave cavity supposed to work at 2.4 Ghz. Hence the SWVR meter...

    Hope you could help.

    Best regards

    Richard

  • in reply to Former Member

    Richard - If you just need a coupler - I would buy a Minicircuits pre-made coupler - it's only $120.00 USD and you really can't even do a quick protoboard for that. Much less make a coupler with PC Material and an xacto knife. Look at the Model,

     

    ZABDC20-322H

     

    It handles 50 watts, has excellent specifications and is connectorized.

     

    If your need is to put this on a PCB then you can get the surface mount version from Minicircuits also.

     

    Regards,

     

    Steve H

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  • in reply to Former Member

    Richard - If you just need a coupler - I would buy a Minicircuits pre-made coupler - it's only $120.00 USD and you really can't even do a quick protoboard for that. Much less make a coupler with PC Material and an xacto knife. Look at the Model,

     

    ZABDC20-322H

     

    It handles 50 watts, has excellent specifications and is connectorized.

     

    If your need is to put this on a PCB then you can get the surface mount version from Minicircuits also.

     

    Regards,

     

    Steve H

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