4 Antenna connection
Ophelia-I’s smart antenna configuration allows the user to choose between two antenna
options: onboard PCB antenna and external antenna. Detailed description on how to imple-
ment different antenna solution is given in chapter
and
4.1 On-board PCB antenna
The Ophelia-I has an on-board PCB antenna optimized for strong miniaturization operating
in the 2.4 GHz frequency band. To use this integrated antenna, it has to be connected to the
radio chip by connecting the pins
and
The use cases for the integrated antenna are miniaturization of the end appli-
cation and applications with required radio range of just few meters.
4.2 External antenna
For applications that use an external antenna, the Ophelia-I provides a 50
Ω
RF signal on
pin
of the module. In this configuration, pin
of the module has to be left open and
pin
has to be connected to the external antenna via 50
Ω
feed line.
An external antenna is normally used to increase the achievable radio range,
at the cost of more space needed in the device/application. Also, an exter-
nal antenna could be needed to fit the specific application environment of the
module, for example when a metal housing is used.
Ophelia-I reference manual version 1.0
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