1. Quick Florescent Measurements
Month 2002
doc.: IEEE /0631r0
July 2003
Quick Florescent Measurements
Jeff Gilbert, Qinfang Sun, Ardavan Tehrani, Won-Joon Choi
Atheros Communications
July 23, 2003
Gilbert et. al., Atheros
Gilbert et. al., Atheros

2. Month 2002
doc.: IEEE /0631r0
July 2003
Setup
Goal was to confirm / refute results of Nir Tal (Metalink)– document htsg
Signal generator and spectrum analyzer used
Tested at 5.16GHz
Output power +10dBm
5GHz omni antenna on Tx, directional horn on Rx
Spectrum analyzer sweep = 1/120Hz per box (in US)
No additional amplifiers used
Figures taken when “florescent effect” was maximized - bounced off of ceiling lights and circular tube desk light
Effect was not as dominant unless searched for
Also seen with two omni antennas
Gilbert et. al., Atheros
Gilbert et. al., Atheros

3. Figure 1 (circular desk light)
July 2003
Figure 1 (circular desk light)
Gilbert et. al., Atheros

4. Figure 2 (circular desk light)
July 2003
Figure 2 (circular desk light)
Gilbert et. al., Atheros

5. Figure 3 (circular desk light)
July 2003
Figure 3 (circular desk light)
Gilbert et. al., Atheros

6. Figure 4 (linear ceiling light)
July 2003
Figure 4 (linear ceiling light)
Gilbert et. al., Atheros

7. Figure 5 (linear ceiling light)
July 2003
Figure 5 (linear ceiling light)
Gilbert et. al., Atheros

8. Figure 6 (linear ceiling light)
July 2003
Figure 6 (linear ceiling light)
Gilbert et. al., Atheros

9. Conclusion Effect was present when florescent light was in path
Month 2002
doc.: IEEE /0631r0
July 2003
Conclusion
Effect was present when florescent light was in path
Directional antenna allowed pinpointing to lights
Effect was not present when light was not in path
Waveform vs. time was not simple sinusoid esp. for circular light – varied by angle
Effect also seen with two omni antennas
More experiments needed to characterize:
Degree of effect
Frequency sensitivity
Waveform shape
and determine if it has to be incorporated into model
Gilbert et. al., Atheros
Gilbert et. al., Atheros