Microstrip Hybrid Ring Coupler.
DEPARTMENT OF THE NAVY WASHINGTON D C
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A microstrip hybrid ring coupler providing the same function as a conventional magic Tee in waveguide or a coaxial rat-race is described. The ring is comprised of four equal electrical length arcs between the input-output ports. The 180 degree phase shift is introduced in one of the four ring arcs by a tightly coupled parallel strip conductor which extends towards the interior of the ring and has an electrical length of gamma4 where gamma is the wavelength at the midband operationg frequency of the coupler.
- Electrical and Electronic Equipment