I'm designing a board for a client who wants to try the 2.4GHz antenna shown in appnote DN007. Unfortunately, that appnote isn't very clear as to how the west end is grounded, nor how best to match it. Does it simply want to be grounded to a ground plane at both of those south-going tabs over on the west side? Is the appropriate feed a simple 1:1 balun to match the CC2540 antenna port to what seems to be a 50 ohm unbalanced feedpoint on the antenna? Any other tips on how best to use this antenna design?
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