OBID i-scan
®
Mounting Instruction
ID ISC.ANT340/240-A / -B
FEIG ELECTRONIC GmbH
Page 24 of 28
M10101-3de-ID-B.doc
E N G L I S H
5.3 How to measure the voltage standing wave ratio (VSWR)
If an antenna has been tuned, the question is: how good is the adjustment between reader and
antenna? In this case, the VSWR –meter is a very useful aid. This device measures the ratio be-
tween supplied and reflected energy. A VSWR of up to 1.3 :1 is considered to be sufficient.
Figure 4:Inserting a VSWR meter into the antenna cable
A selection of recommended VSWR devices are shown on page 9 Recommended equipment and
possible sources:.
Pad antenna
ID ISC.ANT340/240
VSWR Meter
Antenna
