Antenna Measurement with Network Analyzer
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Design Note
DN001
SWRA096 Page 1 of 10
Antenna Measurement with Network Analyzer
By Audun Andersen
Keywords
• Antenna
• Network Analyzer
• Measure
• Return Loss
• Reflection
• Impedance
1 Introduction
The performance of an antenna will impact
the communication range of a RF system.
Since range is often a critical factor when
designing RF systems, it is important to be
able to characterize the antenna. One
parameter that is important, and which can
easily be measured is the return loss (RL).
Impedance mismatch between the feeding
transmission line and the antenna causes
reflection at the feed point of the antenna.
Because of this reflection not all of the
available power will reach the antenna,
and thus the field strength of the radiated
signal will be reduced. RL describes how
much of the available power is reflected at
the feed point of the antenna. This
document describes how RL can be
measured, with a network analyzer, and
how to interpret the result. The
measurement technique described in this
document is only applicable to single
ended antennas. A brief explanation on
how to tune the antenna impedance is
also described.
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