8545-0198-01 Revision 1.9 STX3 Users Manual
9/24/2020 Globalstar, Inc. Confidential and Proprietary Page | 10
4.1 Antenna Requirements
The ideal antenna is a ceramic patch that has left hand circular polarization. This antenna should have a gain of between -1dB and
5.1dB in the spatial area between 25 degrees and 90 degrees elevation.
The STX3 has Modular Certification from the FCC (USA) and Industry Canada (Canada) when used with an antenna that meets the
specifications above. This means that, in general, no further FCC Part 25 testing or IC testing is required when using an approved
antenna (recommended antennas are listed in Appendix A of this document) in accordance with the Globalstar-specified
implementation requirements listed in this document. Note however, that regulatory requirements are subject to change at any
time, and it is the responsibility of the integrator to ensure that the product is fully compliant with all applicable regulations in
whatever markets the integrator is selling the product.
Final installation must be in compliance with 25.213. The antenna installation and operating configuration of this transmitter must
satisfy MPE categorical Exclusion Requirements of 2.1091. The antenna used for this transmitter must be installed to provide a
separation distance of at least 20 cm from all persons and must not be collocated or operating in conjunction with any other
antenna or transmitter.
1.1. Trace and Cable Losses
The Antenna port (Pin 22) is designed to interface to a 50 Ohm antenna. This connection should feed to the antenna by means of a
50 Ohm impedance trace on the circuit board. The following example impedance calculation is for a co-planar waveguide trace on
the top layer of a standard 0.063” FR-4 2-layer board material (60-mil core material) with a dielectric εr ≈ 4.6 and 1/2 oz. Copper.
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