SARA-R4 series - System integration manual
UBX-16029218 - R20 Design-in Page 77 of 128
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2.4.5.2 Guidelines for ANT_DET layout design
Figure 47 describes the recommended layout for the antenna detection circuit to be provided on the
application board to achieve antenna detection functionality, implementing the recommended
schematic described in the previous Figure 46 and Table 34:
• The ANT pin must be connected to the antenna connector by means of a 50 transmission line,
implementing the design guidelines described in section 2.4.2 and the recommendations of the
SMA connector manufacturer.
• DC blocking capacitor at ANT pin (C2) must be placed in series to the 50 RF line.
• The ANT_DET pin must be connected to the 50 transmission line by means of a sense line.
• Choke inductor in series at the ANT_DET pin (L1) must be placed so that one pad is on the 50
transmission line and the other pad represents the start of the sense line to the ANT_DET pin.
• The additional components (R1, C1 and D1) are provided as ANT_DET ESD protection.
• The additional high pass filter (C3 and L2) is provided as ESD immunity improvement.
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