QUESTION

Question

I have an existing WIFI product that I am adapting to 4G/LTE.
The number of possible positions to place antennas in the existing envelope is very limited so one option I was considering was placing a flexiiANT (Zhengi) on the plastic lid over a Lithium pouch cell battery.
In my case there would only be 0.7mm clearance between the battery and the antenna.

Co-planar to a PCB you recommend a distance of  >15mm  would this be the same over a battery?

If so is there a way to tune or manufacture an antenna for a position such as this?

Answer 1

Our recommendation would be to use the Zenon non-detuning antenna.  It can be mounted on the battery itself.

Comments

The datasheet for the Zenon (SR4W030)  antenna only mentions 2.4GHz operation. Are there other versions of this product that would cover the 4G/LTE range of frequencies?

Answer 2

A battery is a large rolled up or folded ground surface. With your small distance the ground plane is a short circuit for the radio wave.