Specifications

Cinterion
®
PLS62-W Hardware Interface Overview
2.2 RF Antenna Interface
29
t PLS62-W_hio_v02.010a 2020-08-18
Public / Released
Page 22 of 50
2.2.1 Antenna Installation
The antenna is connected by soldering the antenna pads (ANT_MAIN and ANT_DRX) and
their neighboring ground pads directly to the application’s PCB.
The distance between the antenna pads and their neighboring GND pads has been optimized
for best possible impedance. To prevent mismatch, special attention should be paid to these
pads on the application’ PCB.
The wiring of the antenna connection, starting from the antenna pad to the application’s anten-
na should result in a 50
Ω line impedance. Line width and distance to the GND plane need to
be optimized with regard to the PCB’s layer stack.
To prevent receiver desensitization due to interferences generated by fast transients like high
speed clocks on the external application PCB, it is recommended to realize the antenna con-
nection line using embedded Stripline rather than Micro-Stripline technology.
For type approval purposes, the use of a 50
Ω coaxial antenna connector (U.FL-R-SMT) might
be necessary. In this case the U.FL-R-SMT connector should be placed as close as possible
to PLS62-W‘s antenna pad.
2.2.2 RF Line Routing Design
2.2.2.1 Line Arrangement Examples
Several dedicated tools are available to calculate line arrangements for specific applications
and PCB materials - for example from http://www.polarinstruments.com/ (commercial software)
or from http://web.awrcorp.com/Usa/Products/Optional-Products/TX-Line/ (free software).
Embedded Stripline
This figure below shows a line arrangement example for embedded stripline with 65µm FR4
prepreg (type: 1080) and 710µm FR4 core (4-layer PCB).
Figure 8: Embedded Stripline with 65µm prepreg (1080) and 710µm core