User's Manual

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DT‐0237A page13of24 Rev:1.0
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Table 2 Antenna micro-strip trace parts
Part Number Designator Description Manufacturer
N/A
G8, G10, G15, G16, G18 Not installed N/A
RK73Z1ETTP
G7, G9, G17, R52
RESISTOR 0.0 OHMS 1/16W 5% 0402 SMT
KOA Speer Electronics
LQW18AN75NG00D
L2
INDUCTOR 75nH, 2%, 270mA 560mΩ, 0603 SMT
Murata Manufacturing
1-1478979-0
J53
SMA JACK CONNECTOR (FEMALE) PCB Mount 4
legs, SS/Gold pl.
TE Connectivity
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5.4.2 Designvalidation&productionprocedures
To verify compliance of the reference trace, a coupon must be requested with every manufacturing panel form and for which the
characteristics are described in the Gerber files. Part of these characteristic are shown in Figure 8. Then a network analyzer is used to
measure the impedance of this coupon in order to validate the antenna trace.
Figure 8 Coupon requirements to validate trace impedance
5.4.3 Otherconsiderations
The only antennas, also describe is section 4.2, that can be used with the module using the reference trace design are the:
- Larsen Antennas, RO2406NM, 6 dBi
- Mobile Mark, CVS-2400, 2.5 dBi
The use of any other antenna or any changes to the reference trace design are subject to additional testing and authorization through a
Class II permissive change.
ModifyingtheRFSignalRouting
As previously mentioned, any changes to the RF traces is subject to approbation, additional testing and authorization through a Class II
permissive change on the FCC and IC grants.
The objective is to use the W10 and W16 pads from OSDI module to route a micro-strip traces in order to obtain a uniform transmission
line with a characteristic impedance of 50 ohms. The characteristic impedance depends on the geometry of the trace and on the relative
dielectric constant of the PCB as shown in Figure 9. However, the characteristic impedance does not depend on the length of the trace.
Many tools are available on the web to help calculate the optimum dimensions.