CST – Computer Simulation Technology

Rat-race Microstrip Coupler | Antenna Magus

Image of the Rat-race microstrip coupler.

The rat-race may be considered as the microstrip equivalent of the waveguide Magic-T already designed by Antenna Magus. It is a four-port network which produces a 180 degree phase shift between the two output ports, hence the name "180 degree hybrid junction".

With reference to the port numbers shown below - when fed at port 1 (also known as the Sum port), two equal and in-phase signals are received at ports 2 and 3; while when fed at port 4 (also known as the Difference port), two equal but out-of-phase signals are received at ports 2 and 3. Good isolation is achieved between the two input ports (1 and 4).

The rat-race ring hybrid with its relevant line lengths and impedances
Typical reflection coefficient behavior versus frequency with an input applied at port 1...
Typical phase behavior versus frequency with an input applied at port 1
Typical reflection coefficient behavior versus frequency with an input applied at port 4
Typical phase behavior versus frequency with an input applied at port 4

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