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CC254x with pcb balun and pcb antena

natanel
Intellectual 590 points

Hi

as really don't understand anything considering antena planning

I would like to simplify my costum board with BLE cc254x

though using 

Murata’s LFB182G45BG2D280 balun (http://www.ti.com/lit/an/swra380a/swra380a.pdf) with some pcb antena (http://www.fractus.com/sales_documents/FR05-S1-N-0-102/UM_FR05_S1_N_0_102.pdf)

1) is it will be simpler than planning the antena with the area around it? (http://www.ti.com/lit/an/swra117d/swra117d.pdf)

2) what should I take into consideration using pcb balun and antena?

3) just adding to board design? or need some clearance, special ground...

4) which pcb antena  you suggest? the above one I could not find it in digikey to get prices

5) any example design using pcb balun and antena?

thanks

  • 0
    Intellectual 515 points

    This balun is designed to convert CC254x devices output impedance (balanced 70 + j30 Ohms) to unbalanced 50 Ohms.  As long as you use any 2.4GHz antenna with 50 Ohms characteristic impedance and unbalanced input it should work just fine.   Balun is very specific to CC254x but antenna could be of any design.  Just make sure it has 50 Ohms input impedance at 2.4GHz and suits your application (i.e. omnidirectional, high efficiency, etc.)   Chip antennas are very demanding when it comes to PCB layout so make sure you follow antenna manufacturer reference design or datasheet as precisely as you can.

    If you have access to test equipment you can allow for fine tuning of the antenna by leaving an optional series and parallel 0402 component pads at antenna feedpoint.

    Leo