Texas Instruments CC13 Series, Application Report

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RX
RX
Switch
RX
TX
ANT2
ANT1
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Measurement Results
11 SWRA523B – September 2016 – Revised March 2017
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CC13xx Antenna Diversity
4.3 Radiated Measurement Results
4.3.1 Hardware Setup
Testing was conducted with the following:
• One transmitter
• Thee receivers
• Two antennas (ANT1 and ANT2)
The hardware test setup allows an antenna diversity solution to be compared with a single-antenna
solution at the same time and with the same fading conditions.
The three receivers were in RX mode at the same time. The hardware test setup allows comparison of an
antenna-diversity solution with a single-antenna solution at the same time and with the same fading
conditions.
Figure 7 shows a block diagram of the test setup and Figure 8 shows the test board.
Figure 7. Block Diagram of Antenna Diversity Test Setup
Notes with reference to Figure 8 :
• A CC1310EM is connected to the left antenna (ANT1) through a splitter. This RX board does not use
the antenna diversity patch.
• A second CC1310EM is connected to the right antenna (ANT2) through a splitter. This RX board does
not use the antenna diversity patch.
• A third CC1310EM is connected to both antennas (DIV) through a switch and splitters. This RX board
uses the antenna patch.
• A CC1310EM is used as a transmitter.
• The antenna feed points are placed a distance of
λ
/4 apart.
• The antennas are placed at right angles to each other.
• Control signals for the switch are made available on two of the CC1310 DIOs and are used to select
the appropriate antenna through the switch.