QUESTION

0 votes
asked by
We use the A10192 and we are failing radiated emissions at 125MHz
We did not design the board in question and do not have schematics but I was hoping to find out more about the applications this part is used in. We have 120MHz noise all over are board and cannot isolate it.

Thanks

Dave Anderson

Please log in or register to answer this question.

1 Answer

0 votes
answered ago by

Hi Dave,

The part in question is a low-profile, surface mount, 2.4GHz antenna. It's used in BT/ BLE, WiFi, ZigBee, and any other 2.4-2.5GHz applications.

Without knowing more about the board, I can say with some certainty that it is unlikely the antenna is causing these issues. The post below titled "How do I determine the source of RSE? I've only got basic equipment" has some good replies on how to determine sources of RSE and what equipment you'd likely need.

Thanks,

Dan

commented ago by
Thanks Dan

I appreciate the input.

The radio module we are using is the USRWIFI232-D2 and we just purchased a RIGOL DSA815 spectrum analyzer and when we use a near field probe we see the 120MHz on at least 1/2 of the pins coming off that module.

We put the WIFI module in the manufacturers programming board that we purchased from then and we see the 120 MHz coming of the WIFI module there also.

We could try a common mode choke or something if we could isolate it to one area.

Any thoughts?
commented ago by

Hi Dave,

This is common when integrating off the shelf modules for many products and can be tricky without the availability to redesign. At this stage, filtering with a choke, shielding, using RF absorber material, or some combination of the three are typically going to be your best approach. 

Here is a link to absorber sheets you can purchase individually to see if you can dampen the noise at the source. The idea is to start with a larger piece at the source of the noise and start trimming to the smallest necessary size as the material isn't cheap, even at volume.  

https://www.mouser.com/ProductDetail/3M-Electronic-Specialty/AB6005S?qs=sGAEpiMZZMtQwYqzsFSgXAx3nfe5pIZUpYQPo1N656A%3D

Thanks,

Dan

Meet the moderators

moderator-image

Chris Tomlin
Antenna Applications Director, Antenova

Chris develops some of the smallest antenna modules and antennas in the world. He leads Antenova's R&D team and supports customers all over the world

moderator-image

Geoff Schulteis
Senior Antenna Application Specialist, Antenova

Geoff has 19 years' worth of antenna design and OTA measurement experience. He has an intricate knowledge of FCC and world carrier requirements.

moderator-image

Dan Dobransky
Senior Antenna Applications Specialist

Dan is an antenna integration specialist. He has a wealth of design-in and antenna development experience, which he uses to make sure our customer's products thrive

download-guide-image

Antennas: The Comparison Guide

Find the perfect antenna for your project

Download
...