Reference Guide

HUM-A-900-PRO Trace Layout Guide
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1. Approved RF Connections for HUM-A-900-PRO-UFL
The HUM-A-900-PRO-UFL module employs an integrated u.FL RF connector. Therefore, the design
and layer stackup of the host PCB does not need to meet any special requirements to maintain the
validity of the module’s pre-certified status.
2. Approved RF Connections for HUM-A-900-PRO-CAS
2.1. Edge Mount RP-SMA Connection
This is the preferred RF connection design for the HUM-A-900-PRO-CAS module and 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 an edge mount reverse
polarity SMA connector Linx Part number CONREVSMA003.062. 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 1 shows the required host PCB layer stackup for the Edge Mount RP-SMA
connection. This layer stackup must be matched precisely including material type,
dielectric constant, dielectric thickness, and copper thickness.
 Figure 1 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 1 – PCB Stackup for Edge Mount RP-SMA Connection