WT21-A-HCI Просмотр технического описания (PDF) - Unspecified
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WT21-A-HCI Datasheet PDF : 57 Pages
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13 Layout Guidelines
13.1
WT21-N
RF output can be taken directly from the RF test point (RFTP) of the module. RFTP has a signal
pin surrounded by a ground. Use 50 ohm trace to route RF from RFTP. With WT21-A leave RFTP
floating and do not place copper directly under RFTP.
GND stitching vias for overlapping
GND planes
50 ohm trace from RF
pin to SMA connector
GND contact for the RF trace
All GND pins connected
Directly to a solid GND
plane
Figure 33: Possible layout for WT21-N
A transmission line impedance calculator, such as TX-Line made by AWR, can be used to
approximate the dimensions for the 50 ohm transmission line. Figure 34 shows an example for
two different 50 ohm transmission lines.
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