Device for the coupling to a common antenna of at least two transmitting and/or receiving devices

Device for the coupling to at least one common antenna of at least two devices for transmitting and receiving microwave frequency signals operating in a same frequency range but having separated working bands, a four-channel circuit comprising:

• - a first channel for coupling a transmitter of a first device to the antenna by the intermediary of a first passive filter and of a first circulator,
• - a second channel for coupling a receiver of said first device to the antenna by the intermediary of a second passive filter and of a second circulator,
• - a third channel for coupling a transmitter of a second device to the antenna by the intermediary of a third passive filter and of said second circulator, and
• - a fourth channel for coupling a receiver of said second device to the antenna by the intermediary of a fourth passive filter and of said first circulator,
• said first passive filter is a band pass filter centered on the middle of the working band of said transmitter of said first device;
• said second passive filter is a band pass filter centered on the middle of the working band of said receiver of said first device;
• said third passive filter is a band rejection filter centered on the middle of the working band of said receiver of said first device;
• said fourth passive filter is a band rejection filter centered on the middle of the working band of said receiver of said first device;
• each circulator being connected to the transmitter of one of said devices and to the receiver of the other of said devices to allow the transmission of signals from said transmitter of one of said devices to the antenna and from the latter to said receiver of said other of said devices and to inhibit the transmission of signals from said transmitter of said one of said devices to said receiver of said other of said devices.