A communications gateway intended to connect at least one LPWAN network and at least one cellular network, the gateway comprising: • a first RF chain intended to communicate with said at least one LPWAN network, the first RF chain comprising a LPWAN antenna, a transponder with a transmitter and a receiver and, installed in series between the transponder and the LPWAN antenna: • at least one filtering block, comprising: • an amplification block comprising an uplink channel and a downlink channel configured in parallel, • then, going toward the LPWAN antenna, a part common to the uplink channel and to the downlink channel, the common part comprising a bandpass filter passing the frequencies in a band of frequencies of said at least one LPWAN network, attenuating the power of the frequencies outside of the band of said LPWAN network, • and a first high-pass filter; and • a second RF chain toward said cellular network, the second RF chain being suitable for establishing an uplink and downlink connection with the cellular network, a frequency band of the downlink and a frequency band of the uplink of the cellular network being outside of the band of said LPWAN network, the second RF chain comprising a cellular antenna, a modem and, installed in series between the modem and the antenna: • at least one rejection filter attenuating the power of the frequencies within the frequency band of said at least one LPWAN network and passing the frequencies within the frequency band of the downlink and the frequency band of the uplink of the cellular network. • a first RF chain intended to communicate with said at least one LPWAN network, the first RF chain comprising a LPWAN antenna, a transponder with a transmitter and a receiver and, installed in series between the transponder and the LPWAN antenna: • at least one filtering block, comprising: • an amplification block comprising an uplink channel and a downlink channel configured in parallel, • then, going toward the LPWAN antenna, a part common to the uplink channel and to the downlink channel, the common part comprising a bandpass filter passing the frequencies in a band of frequencies of said at least one LPWAN network, attenuating the power of the frequencies outside of the band of said LPWAN network, • at least one filtering block, comprising: • an amplification block comprising an uplink channel and a downlink channel configured in parallel, • then, going toward the LPWAN antenna, a part common to the uplink channel and to the downlink channel, the common part comprising a bandpass filter passing the frequencies in a band of frequencies of said at least one LPWAN network, attenuating the power of the frequencies outside of the band of said LPWAN network, • an amplification block comprising an uplink channel and a downlink channel configured in parallel, • then, going toward the LPWAN antenna, a part common to the uplink channel and to the downlink channel, the common part comprising a bandpass filter passing the frequencies in a band of frequencies of said at least one LPWAN network, attenuating the power of the frequencies outside of the band of said LPWAN network, • and a first high-pass filter; and • a second RF chain toward said cellular network, the second RF chain being suitable for establishing an uplink and downlink connection with the cellular network, a frequency band of the downlink and a frequency band of the uplink of the cellular network being outside of the band of said LPWAN network, the second RF chain comprising a cellular antenna, a modem and, installed in series between the modem and the antenna: • at least one rejection filter attenuating the power of the frequencies within the frequency band of said at least one LPWAN network and passing the frequencies within the frequency band of the downlink and the frequency band of the uplink of the cellular network. • at least one rejection filter attenuating the power of the frequencies within the frequency band of said at least one LPWAN network and passing the frequencies within the frequency band of the downlink and the frequency band of the uplink of the cellular network.