HMS Networks Anybus Wireless Bridge II CAN User Manual page 73

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Internal Antenna Characteristics Anybus Wireless Bridge II CAN
In this example, the measurements are made both with and without back shield.
A back shield is a metal surface of at least 300x300 mm.
The Bridge II CAN is placed in the center of the back shield.
The back shield could be any flat metal surface, like a metal plate or a metal cabinet.
Figure 53. Back shield
The measurements with back shield clearly shows that the back shield makes it possible to focus the radio
energy in any desired direction (away from the back shield).
Figure 54. Measurements with and without back shield
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