82 Appendix
NN47250-503 (323847-C Version 02.01)
To minimize path loss effects, you can either increase the transmit power, increases the system gain, decrease
the operating frequency or increase the receiver sensitivity on the other end of the wireless communications
link. In addition, path loss increases by a factor of approximately 6 dB for every doubling of frequency or path
distance. This factor is significant because it means that a doubling of the antenna or system gain, an increase
of 3 dB, will not double the propagation distance of the signal. To double the usable coverage area or path
distance, the antenna or system gain would have to increase by a factor of four, which equates to an increase of
6 dB.
Table 18: Path loss in [dB] for loss coefficient of n=2
Frequency (MHz)
Distance
(m)
2400 2450 2500 5150 5250 5350 5470 5725 5850
10 -60.0 -60.2 -60.4 -66.7 -66.8 -67.0 -67.2 -67.6 -67.8
50 -74.0 -74.0 -74.4 -80.7 -80.8 -81.0 -81.2 -81.6 -81.8
100 -80.0 -80.0 -80.4 -86.7 -86.8 -87.0 -87.2 -87.6 -87.8
150 -83.6 -83.6 -83.9 -90.2 -90.4 -90.5 -90.7 -91.1 -91.3
200 -86.1 -86.1 -86.4 -92.7 -92.9 -93.0 -93.2 -93.6 -93.8
250 -88.0 -88.0 -88.4 -94.6 -94.8 -95.0 -95.2 -95.6 -95.7
300 -89.4 -89.6 -89.9 -96.2 -96.4 -96.6 -96.7 -97.1 -97.3
350 -90.9 -90.9 -91.3 -97.6 -97.7 -97.9 -98.1 -98.5 -98.7
400 -92.1 -92.1 -92.4 -98.7 -98.9 -99.1 -99.2 -99.6 -99.8
500 -94.0 -94.0 -94.4 -100.7 -100.8 -101.0 -101.2 -101.6 -101.8
750 -97.5 -97.5 -97.9 -104.2 -104.3 -104.5 -104.7 -105.1 -105.3
1000 -100.0 -100.2 -100.4 -106.7 -106.8 -107.0 -107.2 -107.6 -107.8
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