Incident Mobile Radiation measurement

Thread Starter

deepak4you

Joined May 1, 2010
47
Experts,

Greetings from sunny India. Need some help on my research study.

I'm working on a research project to measure incident radiation coming from 100s of mobile phones around us in public areas. In other words, if in a closed public space like a shopping mall, how much radiation is emitted by people around me (averaged based on numbers) and how much is incident on my body.

I have electronics and telecommunications background and I have been thinking of some very simple ideas (simplicity works best for me) to measure the incident radiation coming from mobile phones. Since there are 3 mobile communications bands viz: 900 MHz (2G), 1800 MHz (2G DSC) and 2100 MHz (3G WCDMA), I thought if we could have 3 antennae with 3 band-pass filters for the above 3 bands, pass on the output to a high frequency op-amp, measure the outputs of the 3 op-amps and compute the incident radiations based on this output and some numerical methods.

I know it is easier said than done.
1. Output of the antenna would be in micro volts. To amplify this output to millivolts level while cancelling out noise would be a challenge. A multi-staged instrumentation amplifier could be possible, but for those high frequencies?
2. Band pass output from the antenna could be achievable, but different phones would be transmitting at different frequencies, but within the bandpass range. I wonder if that will affect the output.
3. Even if we are able to amplify the AC voltage to milli volt level, how to handle it from there on at those high frequencies? ADC? Direct uC interface?
4. Sensitivity of other peripheral components for circuit stability etc.

Anybody done something similar or can provide any inputs on how to approach the problem(s)? How best to handle? What design approach to adopt?

Inputs would be greatly appreciated.

Regards,
Deepak
 

AlbertHall

Joined Jun 4, 2014
10,553
You will presumably also receive the signals from the base station transmitters. This may be OK if you intend this radiation to be included.
 

BR-549

Joined Sep 22, 2013
4,938
It's too bad a sdr tv dongle doesn't go that high. It would record all the information that you need.

Perhaps a smart rf engineer would know a good converter design for such.
 

Thread Starter

deepak4you

Joined May 1, 2010
47
You will presumably also receive the signals from the base station transmitters. This may be OK if you intend this radiation to be included.
Good point, thanks. I didn't think of it. I wouldn't want to have the BTS side of transmission intercepted. Fortunately uplink and downlink frequencies are different for each band, so band-passing the uplink (from mobile) part should do the trick.
 
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