Microstrip patch antenna on FR4 for 2.4 GHz band

Discussion in 'Wireless & RF Design' started by inductivecapacitor, Aug 19, 2016.

  1. inductivecapacitor

    Thread Starter New Member

    Feb 16, 2015
    I would like to prototype a patch antenna at low cost for a project. The PCB vendor (Seeed studio) that I prefer uses KB-6160 FR4 laminate which does not have dielectric constant data beyond 100 MHz.

    Does anyone have any experience prototyping patch antennas on FR4?
    Is 4.2-4.3 a good estimate of the dielectric constant around 2.4 GHz? Or is it too optimistic to assume a controlled value?
    Any recommendations for getting cheap prototypes on Duroid?

  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    The thickness of a PCB is wrong for that freq.
    It works, but you could get MUCH better performance using PTFE or just air.
    .04 x wavelength is a proper spacing that will give good performance. PCB thickness gives less than .02 x wavelength.

    Lots of good design write ups could be found by searching the web.