When designing an antenna measurement system, there are many parameters that
must be considered in order to select the optimum equipment. Begin by considering the
components for the transmit site, then move to the receive site. Designing a complete
antenna system often requires you to congure the transmit site, then the receive site,
and then make adjustments to the transmit site and recalculate the values for optimum
performance.
Transmit site configuration
Figure 14. Transmit site conguration.
Select the transmit source
In selecting the transmit source, consider the frequency range of the antenna under test,
the distance to the transmit antenna, the available power of the source, and the speed
requirements for the measurements. For compact ranges and near-eld ranges, the
internal PNA source will typically be the best source to meet your measurement needs.
The internal source is faster than an external source and may lower the cost of the
complete system by eliminating a source. Large outdoor ranges may require an external
source that can be placed at a remote transmit site.
Will a transmit amplier be used?
Begin by making your power calculations without an amplier. If after doing the power
calculations the transmit power is not high enough, then add an amplier and run the
calculations again.
3. Antenna measurement design considerations
Transmit antenna
Optional
amplifier
MXG synthesized source or internal PNA source
E
RP
G
amp
L
1
L
2
24 | Keysight | Antenna Test – Selection Guide