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Can we use 2.4GHz RFID readers with passive tags and UHF readers with active tags? Or is it necessary that if we are using 2.4GHz reader then we must use active tags only? And similarly if we are using UHF reader then we must only use passive tag only?
I don’t know any “hybrid” reader. I’ve been working with UHF technology and (as a lesson) you shouldn’t mix apples with pears. Both, active and passive tags work at different frequency.
The thing is that if you buy some UHF (865mhz – 928mhz) tags, and try to read them with your active interrogator you won’t get any data read. The reason, the UHF tags won’t be energize.
You could take a look at this reader, it’s pretty cheap and comes with a great API.