fig. GYRATOR
It is a two-port microwave device that is used to introduce a degree or 0-degree phase shift of electromagnetic wave propagation in forward direction or reverse direction.
Electromagnetic wave propagation in forward transmission from port 1 to port 2& 0-degree phase shift in reverse transmission from port2 to port1.
It consists rectangular waveguide at the receiving & transmitting end with a 90-degree twist which is connected to a circular waveguide.
In the middle section of a waveguide having ferrite rod. over the ferrite rod permanent magnet is placed.
According to faraday's rotation principle, an electromagnetic wave propagating from port1 to port2 in forward transmission, it passes through the twist, it introduces a 90-degree phase shift in a counter-clockwise direction & another 90-degree phase shift introduce by ferrite rod in a counter-clockwise rotation. so, the total angle of rotation is a 180-degree phase shift.
An electromagnetic wave propagating a 0-degree phase shift in reverse transmission from port 2 to port 1 then it introduces a 90-degree phase shift by an in clockwise rotation & another 90-degree phase shift by ferrite rod rotation. Hence, two rotations cancel out each other. Hence, the 0-degree phase shift is introduced.😎
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