Reader Antenna Design Guidelines - Texas Instruments TRF7970A Manual

TRF7970A
SLOS743L – AUGUST 2011 – REVISED MARCH 2017
Resulting power out can be measured with a power meter or spectrum analyzer with power meter function
or other equipment capable of making a "hot" measurement. Observe maximum power input levels on test
equipment and use attenuators whenever available to avoid damage to equipment. Expected output
power levels under various operating conditions are shown in
7.4

Reader Antenna Design Guidelines

For HF antenna design considerations using the TRF7970A, see these documents:
• Antenna Matching for the TRF7960 RFID Reader
• TRF7960TB HF RFID Reader Module User's Guide
78 Applications, Implementation, and Layout
L1
TX_OUT
Pin 5
C2 and C3
Combination
C4, C4, and C7
Figure 7-2. Impedance Matching Circuit
Figure 7-3. Smith Chart Simulation
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L2
Combination
C8, C9, C10, and C11
Combination
Table 6-25.
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50 W