Compact Antenna for omnidirectional patern and CC243x

Hi JP,

Other companies with chip antennas of interest can be:

http://www.yageo.com/e

http://www.murata.com/nproduct/06c_ka621.html

What about a folded dipole?

The antenna radiation pattern and gain are affected by the size and shape of the ground plan. Please keep this in mind your design.

Thanks for the info.

I need for a really constrained design the more space efficient solution, and a chip antenna with the balun is one of the best solution I found.

For the other designs, I usually use your references.

Hi JP,

Great! 

You are very knowledgeable engineer.  

LPWRocks  

yeah. Indeed.

With no RF expertise at all. That's why I need your help.

I just wanna know if I am completly wrong, missing something, need a very expensive tool from someone very smart, or need to pay a huge amount of money to TI or their partners to have someone working to solve this design. I am still wondering how can I fight the 5dB loss due to the orientation of the chip antenna. I also need to know how could I avoid the 10dB loss due to the body crossing the LOS of the RF signal, but I think only Einstein could help me bending the universe, so I will only wait for him to come back ... perhaps before someone could help me with an handy answer to any question I submit to TI thru the regular support service or this forum.

But beside this lack, you have good AN sometimes, and yes ... they are helpful. I regret just not having more "how-to do more with this". You know, that is the story with the fishes and a stick.

EDIT :

note to self (and any one interested) : AN003- SRD Antenna and DN018 give a couple of answers :

• body worn design may account for 3-10dB gain from the body
• no conclusion may be drawn if monopole or loop antenna are best
• vertical polarisation is less prone to the ground effect (so, if the main orientation could be determined, do it vertical)
• 2 chip antenna are used by Meshnetics, and still are smaller/lower profile than most PCB ones, but no info on the effects

 Hi JP,

Maybe check the following web site for some excellent antenna software that can help you simulate and visualize the different effects influence an antenna

http://www.ac6v.com/antsoftware.htm

 LPWRocks

Hi,

If you are interested in a very small compact antenna; then there are design companies such as Fractus who specilze in very compact antenna design (http://www.fractus.com/). You can either purchase standard antenna components from them or use them as antenna consultants for integrating small fractal antenna design into a given area.  I worked with them several years ago on a design that integrated a 2.4GHz antenna onto a IC chip laminate!

Another option would be to use the F-antenna and to place capactive loading at the end of the antenna to reduce the overall size. The problem with antennas is there performance is related to their size. Chip antennas will not be as good as a larger integrated f-antenna for example.

Good luck with your design.

Best regards,

Richard.

Hi all,

I'm designing the new release of our wireless sensor integrating CC2430 and CC2590.

As regards the antenna I have had the same problems, what type of antenna to use? Inverted F or chip antenna? Which is the effect of human body?

At the end I have taken the decision to produce two PCB versions of the same project changing only the antenna and the nearby layout (ground planes, etc.).

A good chip antenna, made on a new technology, is the M830300 of Ethertronics. Ethertronics declares that this chip antenna isn't influenced by human body. I hope this will be true!

http://www.ethertronics.com/products/bluetooth/

By

Fabrizio.