Pcb Antenna Referance Layouts

[Giovanni]

Have you got any 2.4GHz monopole antenna referance design to use with nrf51822 and johanson balun? thanks for you attention

[Oleh]

Hi Giovanni,

please check the nrf51 dongle Reference design, which uses the meander antenna. In your design place a pi-shunt before antenna for tuning.

There is no special antenna for johanson balun, actually any can do if tuned. We used the meander with johanson and st baluns as well (additional cap of 1pF / 1.5 pF was added)

Also, search the forum for "pcb antenna" there are lots of like: link text

Cheers!

[Hung Bui]

Hi Giovanni, Any antenna that support 2.4GHz and 50Ohm impedance should work. I would suggest to follow the antenna made for the nRF51 development kits for your design.

You can also have a look at this document for monopole antenna design. Also please don't forget to add the tuning component to tune the antenna. Please have a look at this document.

[Locky]

Just out of curiosity, why use the Johansen over the ST balun? I believe the ST balun is cheaper and with smaller footprint.

[Giovanni]

because I received this reply in another post link text

[Oleh]

my two cents: Johanson balun one can even solder manually, the ST one -- no way :)