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To reduce signal reflections, sharp angles in the routing of the micro strip line should be avoided.
Chamfers or fillets are preferred for rectangular routing; 45-degree routing is preferred over Manhattan
style 90-degree routing.
Routing of the RF-connection underneath the receiver should be avoided. The distance of the
micro strip line to the ground plane on the bottom side of the receiver is very small (some 100 μm)
and has huge tolerances (up to 100%). Therefore, the impedance of this part of the trace cannot be
controlled.
Use as many vias as possible to connect the ground planes.
In order to avoid reliability hazards, the area on the PCB under the receiver should be entirely
covered with solder mask. Vias should not be open.
Antenna and Antenna Supervisor
5.4
GTS-4E module receive L1 band signals from GPS satellites at a nominal frequency of
1575.42 MHz. The RF signal is connected to the RF_IN pin.
GTS-4E module can be connected to passive or active antennas.
Note:
For GTS-4E receivers, the total preamplifier gain (minus cable and interconnect losses) must not
exceed 50 dB. Total noise figure should be below 3 dB.
5.4.1
Passive Antenna
A design using a passive antenna requires more attention regarding the layout of the RF section.
GTS-4E GPS Module Hardware Integration Manual
Figure 8： RF Line Recommanded Design
Page 19 of 22
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