2.4Ghz: PCB vs SMA antenna

Wireless & IoT
1

Hi

I’m planning a project using [ATmega128RFA1

Signal range and ease of design are the most important factors. I won’t be able to do much testing.

I’m trying to figure out whether I should use a PCB antenna (the one Atmel uses, which I have some experience with), or go for a whip antenna over an SMA connector. I have searched a lot for some comparisons or numbers I can use in my decision, but I haven’t been able to find anything yet. Is a whip antenna significantly better than a PCB one?

The two designs I’m considering are specifically using the Johanson Technology 2450FB15L0001E Filter Balun for Atmel, an edge mounted SMA connector ([like this) and a 2.4Ghz whip antenna. Basically as close to [this as possible. The other is going for the same antenna design as AVR Raven.

Furthermore, the device will be worn on the chest. I was thinking with the antenna parallel to the board and the chest. Does anyone see issues with this?](http://store.atmel.com/PartDetail.aspx?q=p:10500198;c)](http://www.sparkfun.com/products/592)](http://www.atmel.com/dyn/products/product_card.asp?part_id=4692&category_id=163&family_id=676&subfamily_id=2124)

2

Are you doing an RF PC board to learn how to do such (given you are accomplished at digital PC boards)?

Versus using a RF transceiver module?

For best range and flexibility, you could use an antenna connector. Most modules use a U.FL connector (e.g., XBee modules which have options for onboard or external antennas)

Opinion Warning: There are many far better choices in 802.15.4 modules than Atmel. And starting with a chip is really painful.

FCC type certified (legal) modules from Digi, Jennic (NXP), CEL, OKI, Panasonic, and many others.

3

From my experience, I have found that a whip antenna can be significantly better.