Reference Guide

HUM-A-900-PRO Trace Layout Guide
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2.2. MicroSplatch Antenna Connection
This RF connection is approved with all operating modes of the module. This design uses a
PCB microstrip to connect the HUM-A-900-PRO-CAS module’s Antenna castellation to a PCB
mount antenna Linx Part number ANT-916-uSP. A four layer PCB is used in this design. The
Top layer 24mil wide RF trace and Mid-Layer 1 ground plane form an RF microstrip.
 Table 2 shows the required host PCB layer stackup for the MicroSplatch Antenna
connection. This layer stackup must be matched precisely including material type,
dielectric constant, dielectric thickness, and copper thickness.
 Figure 2 shows the trace dimensions that must be followed precisely, including trace
width, and routing
 The Ground plane on Mid-layer 1 must not have any cutouts in the area under the RF
trace or the area between the module and the connector.
Table 2 - PCB Stackup for MicroSplatch Antenna Connection