You can't look at that trace antenna and guess the frequency? Obviously it's ISM... | Hacker News

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		tinix on Sept 15, 2017 \| parent \| context \| favorite \| on: Long-range communication with devices that consume... You can't look at that trace antenna and guess the frequency? Obviously it's ISM band, and these researchers are in the United States. Does it really need to tell you that it's ~900MHz?

bsder on Sept 15, 2017 [–]

Yes, actually, it does.

The green PCB looks more like a 2.4GHz antenna to my eye. The epidermal patch is much longer so looks like 900MHz to me. And there is also 27MHz for ISM. The lower the frequency, the further it tends to go.

https://en.wikipedia.org/wiki/ISM_band

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