Questions and discussions about the hardware aspects of the TD RF modules, boards and accessories.
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RF Layout for TD1208R and TD1508 (US)

by mikepokeeffe Fri Sep 09, 2016 9:41 am


I'm not sure if this should be in Hardware or Antenna's.

I'm currently designing a product that I want to work in both Europe and the US using the TD1208R and the TD1508.

There's a recommended layout in the TD1508 datasheet in Section 11.4.2, which is excellent.

Do you have any recommendations on having a dual optional antenna approach, one U.fl connector for the TD1208R and one U.Fl and matching circuit for the TD1508??
I'd imagine for the proposed circuit in Figure 7 a microstrip layout would work out better?

Thanks in advance,
Mike O'Keeffe
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Joined: Thu May 07, 2015 9:24 am

Re: RF Layout for TD1208R and TD1508 (US)

by mstempin Thu Oct 20, 2016 3:04 pm

You can use the same antenna for both 868.13 MHz and 902.8 MHz, as the SWR will stay < 2 in both cases.

Thus, the recommendations for TD1508 also apply for the TD1508R, and you can design a board that can support both modules.
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