Antenna Tunning

[Sara]

Hi ,

I have designed a beacon using nrf51422 nordic chip. But when I checked the antenna frequency , i came to know that its above 2.45 Ghz. I tried by the changing the capacitor value shunted to antenna but it didnt help much to bring the frequency down to 2.45 Ghz.

Can anybody suggest me some ways to tune the antenna frequency?

[Einar Thorsrud]

Are you using a PCB antenna? The λ/4 printed monopole antenna for 2.45 GHz white paper describes how to design and tune a 2.4 GHz antenna. (The article is old, but the content is still valid.)