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SARA-R4 series - System integration manual
UBX-16029218 - R20
Design-in
Page 75 of 128
C1-Public
2.4.5
Antenna detection interface (ANT_DET)
2.4.5.1
Guidelines for ANT_DET circuit design
describe the recommended schematic / components for the antenna
detection circuit that must be provided on the application board and for the diagnostic circuit that
must be provided on the antenna’s assembly to achieve
antenna detection functionality.
Application Board
Antenna Cable
SARA-R4 series
56
ANT
62
ANT_DET
R1
C1
D1
L1
C2
J1
Z
0
= 50
Ω
Z
0
= 50
Ω
Z
0
= 50 ohm
Antenna Assembly
R2
C4
L3
Radiating
Element
Diagnostic
Circuit
GND
L2
C3
Figure 46: Suggested schematic for antenna detection circuit on application PCB and diagnostic circuit on antenna assembly
Reference
Description
Part Number - Manufacturer
C1
27 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H270J - Murata
C2
33 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H330J - Murata
D1
Very Low Capacitance ESD Protection
PESD0402-140 - Tyco Electronics
L1
68 nH Multilayer Inductor 0402 (SRF ~1 GHz)
LQG15HS68NJ02 - Murata
R1
10 k
Resistor 0402 1% 0.063 W
RK73H1ETTP1002F - KOA Speer
J1
SMA Connector 50
Through Hole Jack
SMA6251A1-3GT50G-50 - Amphenol
C3
15 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H150J - Murata
L2
39 nH Multilayer Inductor 0402 (SRF ~1 GHz)
LQG15HN39NJ02 - Murata
C4
22 pF Capacitor Ceramic C0G 0402 5% 25 V
GRM1555C1H220J - Murata
L3
68 nH Multilayer Inductor 0402 (SRF ~1 GHz)
LQG15HS68NJ02 - Murata
R2
15 k
Resistor for Diagnostics
Various Manufacturers
Table 34: Suggested parts for antenna detection circuit on application PCB and diagnostic circuit on antennas assembly
The antenna detection circuit and diagnostic circuit suggested in
explained:
•
When antenna detection is forced by the +UANTR AT command, the
ANT_DET
pin generates a DC
current measuring the resistance (R2) from the antenna connector (J1) provided on the
application board to GND.
•
DC blocking capacitors are needed at the
ANT
pin (C2) and at the antenna radiating element (C4)
to decouple the DC current generated by the
ANT_DET
pin.
•
Choke inductors with a Self-Resonance Frequency (SRF) in the range of 1 GHz are needed in series
at the
ANT_DET
pin (L1) and in series at the diagnostic resistor (L3), to avoid a reduction of the
RF performance of the system, improving the RF isolation of the load resistor.
•
Resistor on the
ANT_DET
path (R1) is needed for accurate measurements through the +UANTR
AT command. It also acts as an ESD protection.
•
Additional components (C1 and D1 in
) are provided as
ANT_DET
pin as ESD protection.
•
Additional high pass filter (C3 and L2 in
) is provided as ESD immunity improvement
•
The
ANT
pin must be connected to the antenna connector by means of a transmission line with
nominal characteristics impedance as close as possible to 50
.