Device and related method for providing unidirectional microwave propagation

A device for providing a unidirectional propagation of microwaves comprising:

• first and second ports for coupling to other devices configured to generate or receive microwaves and between which the microwaves are to be transmitted;
• a magnetic source arranged to provide a static magnetic field;
• a microwave structure disposed in the static magnetic field and operatively coupled to the first and second ports so that the microwaves are transmittable therebetween, the microwave structure comprising:
• a transmission line configured for transmitting the microwaves between the first and second ports;
• a cavity structure which is electrically or magnetically coupled to the transmission line and configured to define a resonant frequency of the microwave structure which is exhibited along the transmission line;
• and
• a ferromagnetic body disposed in the static magnetic field and adjacent the microwave structure so as to be located in presence of electromagnetic fields emanating from the microwaves transmitted along the transmission line, and arranged so that an induced electromagnetic field emanating from the ferromagnetic body having a resonant frequency distinct from the resonant frequency of the microwave structure interacts with the electromagnetic fields of the microwaves so as to form a set of hybridized resonant frequencies at which zero damping exists, one of the set of hybridized resonant frequencies being a real eigenvalue providing the unidirectional propagation from one of the first and second ports to the other.