−90
−80
−70
−60
−50
−40
−30
0.5123456789101112
Ta g 21
Ta g 22
Ta g 23
(m)
Figure 7: Average value of signal strength sent by three tags and measured within different ranges.
RFID reader
Recovery room
R 5
R 4 R 3 R 2 R 1
R 6
R 7
R 8
R 9 R^10
Front
door
Nursing
center
Tr a n s f e r
room
Waiting
room
Recovery room
Plastercast
Elevator
Patient enter
Sidewalk
sidewalk
Sidewalk
Sidewalk
Sidewalk
Sidewalk
Sidewalk
Sidewalk Sidewalk
Sidewalk
Nonreaction area
R (^11) R 12
R 15
R 13 R^14
Sidewalk reader
54.35m
49.25
m
Figure 8: A simulated installation of RFID readers with 6-meters distance between two readers in the surgery room.