CAN SINGLE ANTENNA USE FOR (BT+RFID)?

most likely not, as BT is electric field based technology (operating at 2.45GHz) and NFC/HF RFID is magnetic field based technology (operating at 13.56MHz). 

Very Good Morning .

Thank you so much

ok.

i had query   again

              i am going to use RFID ACTIVE TAG so it will act in electric field only. And I am going to use frequency of 2.4GHZ only because 13.56 MHZ will cover lower area (2 M).

 SO now can i use Single antenna ?

 suggest me please

if you are only going to use 2.4GHz and not going to use 13.56MHz, then you have answered your own question and you would be doing something non-standard - but most likely feasible creating your own RFID system based on that freq. band. just make sure whatever you are doing is allowed in the country/countries you want to operate in by the respective regulatory agency.

sorry.

please refer link http://www.indiamart.com/rfid-infotek/products.html which say RFID  ACTIVE TAG can use 2.4 ghz

hi

 i AM BACK WITH ANOTHER QUERY

         CC2420 is a   2.4GHZ IEEE 802.15.4 RF  TRANSCEIVER ,

       whether this chip contain in-built antenna?
    if not what antenna i can be use for this chip?

thanks

Janaki - 

if you look in the application notes section here ==> http://www.ti.com/product/CC2420

you will see several docs that should be helpful on the antenna design/selection

http://www.ti.com/litv/pdf/swra351a , etc.

Thanks for reply,

                           After connecting the Antenna(2.4GHZ) for this chip

                             whether this chip will act as the RFID ACTIVE TAG?

This CC2420 device is a 2.4GHz radio - if you want to use it for some active identification application that you are creating, i don't see any issue with that. This forum is dedicated to passive RFID and NFC applications (which this is not).

You may consider posting in this other forum ==> http://e2e.ti.com/support/low_power_rf/f/156.aspx

Thanks Josh i will mail is this Forum.

Thanks