Magic tee
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A magic tee is a hybrid or 3 dB coupler used in microwave systems. It is an alternative to the rat-race coupler. In contrast to the rat-race, the three-dimensional structure of the magic tee makes it less readily constructed in planar technologies such as microstrip or stripline.
A magic T consisting of four rectangular waveguides meeting in a single three-dimensional junction
Hybrid transformer
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A hybrid transformer is a type of directional coupler which is designed to be configured as a circuit having four ports that are conjugate in pairs, implemented using one or more transformers. It is a particular case of the more general concept of a hybrid coupler.
Using hybrids for bidirectional amplification
Wiring diagram of a single transformer hybrid
Wiring diagram of a double transformer hybrid