User's Manual
Table Of Contents
- Contents
- Tables
- Figures
- 0 Document History
- 1 Introduction
- 2 Product Concept
- 3 Interface Description
- 4 Mechanics, Mounting and Packaging
- 5 Full Type Approval
- 6 List of Parts and Accessories
GWM300 Hardware Interface Overview
3.8 RF Antenna Interface
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GWM300_HIO_v01 2016-01-26
Confidential / Released
Page 26 of 35
3.8 RF Antenna Interface
An external RF antenna is connected via the GWM300’s female FME connector that is also the
antenna reference point (ARP).
Figure 7: Antenna connector
The system impedance is 50. In any case, for good RF performance, the return loss of the
customer application’s antenna should be better than 10dB (VSWR < 2). GWM300 withstand
a total mismatch at this connector when transmitting with maximum RF power.
Additional ESD protection to the antenna connector is provided. No DC voltage must be applied
to the antenna circuit to protect it from damage.
Please note that the terminal should be installed and operated with a minimum distance of
20cm between the antenna connected to the terminal and any human bodies. Also, the trans-
mitter must not be co-located or operating in conjunction with any other antenna or transmitter.
The antenna's character impedance should be 50
. It it recommended that the antenna should
have VSWR <=2:1, within the working band frequency range.