Building a Smooth Medical Service for Operating Room Using RFID Technologies

Table 4

The signal strength matrix under different distances between two readers.

(a) Distance between two readers is 2 meters

Signal level	Distance between tag and reader	RSS
0^†	<0.5 m	>−38.5
L1^Δ	0.5 m~1 m	−39∼−47.5
L2^#	1 m~2 m	−48∼−52.5
L3*	2 m~3 m	−53∼−65

(b) Distance between two readers is 4 meters

Signal level	Distance between tag and reader	RSS
L0^†	<1 m	>−46
L1^Δ	1 m~2 m	−46.5∼−53.5
L2^#	2 m~4 m	−54∼−59.5
L3*	4 m~6 m	−60∼−67

(c) Distance between two readers is 6 meters

Signal level	Distance between tag and reader	RSS
L0^†	<1 m	>−46
L1^Δ	1 m~3 m	−46.5∼−𝟓8
L2^#	3 m~6 m	−58.5∼−64
L3*	6 m~9 m	−64∼−77

(d) Distance between two readers is 8 meters

Signal level	Distance between tag and reader	RSS
L0^†	<1 m	>−46
L1^Δ	1 m~4 m	−46.5∼−59.5
L2^#	4 m~8 m	−6𝟎∼−69.5
L3*	8 m~12 m	−70∼−84

(e) Distance between two readers is 12 meters

Signal level	Distance between tag and reader	RSS
L0^†	<1 m	>−46
L1^Δ	1 m~6 m	−46.5∼−67.5
L2^#	6 m~12 m	−68∼−73.5
L3*	12 m~18 m	−74∼−90