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Verfügbare Sprachen
Verfügbare Sprachen
BIS U Basic Manual
7
Component Properties and System Characteristics
7.6 Theoretical
Reading Range
20
Under ideal conditions, the electric field intensity in the far field (approximately > 70 cm)
decreases reciprocally in relation to the distance (free space loss). Varying the antenna power
generates an array of curves that allocates a unique field intensity to every point within the
surrounding environment.
The theoretical reading range for the different levels of power radiated from the antenna can be
determined by intersecting the response field intensity with the relevant field intensity curve.
Under ideal boundary conditions, this type of reading range value is calculated in a free field or a
large absorber chamber.
2.0
Transponder I
260 cm
Transponder II
820 cm
Table 2:
Theoretical reading ranges as a function of the antenna power
8,00
2.0 W
7,00
6,00
0.5 W
5,00
4,00
0.25 W
3,00
Transponder I
2,00
1,00
Transponder II
0,00
0
100
200
Figure 11:
Determining the theoretical reading range
Antenna power in watts
1.0
190 cm
560 cm
300
400
500
600
Distance to the antenna in cm
0.25
90 cm
280 cm
700
800
900
1000
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