SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11
Design-in
Page 88 of 157
Manufacturer Part Number
Product Name
Description
86 x Ø 199 mm
Laird Tech.
OC69271-FNM
GSM / WCDMA / LTE pole-mount antenna with N-type(M)
698..960 MHz, 1710..2690 MHz
248 x Ø 24.5 mm
Pulse
Electronics
WA700/2700SMA
GSM / WCDMA / LTE clip-mount MIMO antenna with cables and SMA(M)
698..960 MHz,1710..2700 MHz
149 x 127 x 5.1 mm
Table 24: Examples of external antennas
2.4.2
Antenna detection interface (ANT_DET)
2.4.2.1
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.
Applicat ion Board
Ant enna Cable
SARA-R4/ N4
56
ANT
62
ANT_DET
R1
C1
D1
L1
C2
J 1
Z
0
= 50
Ω
Z
0
= 50
Ω
Z
0
= 50 ohm
Ant enna Assembly
R2
C4
L3
Radiat ing
Element
Diagnost ic
Circuit
GND
L2
C3
Figure 35: 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
