Reception of a signal is a key component of mobile communication, so it is important to make sure that the end-device used has a proper antenna design. Consider making the antenna external to the device. Note that it is not possible to amplify a signal that was not received in the first place. IMST GmbH, a German based research-driven industrial engineering and design house specializing in radio technologies, has created an antenna reference design guide for ISM band applications. It can be accessed online. The figure below provides an overview of several antennas and their advantages and disadvantages.
We highly recommend consulting an expert on antenna design when designing a LoRaWAN device.
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