Abstract This application describes a transformer hybrid coupler in which the power division ratio can have essentially any arbitrary value. The coupler comprises two quadrifilar coils, each one of which includes two, tightly coupled N:1 transformers. The coils are series connected such that one end of each of the primary windings of one coil is coupled to one end of a different one of the secondary windings of the other coil in a manner such that the network representation of the resulting four-port with respect to the symmetric mode of excitation is the dual of the network representation with respect to the antisymmetric mode of excitation. The other ends of the windings of either one of the coils constitute the four coupler ports, while the other ends of the windings of the other coil are connected to a common junction, typically ground.
A hybrid coupler comprising: two quadrifilar coils, each of which comprise two, tightly coupled N:1 transformers; one end of each primary windings of each of said coils being connected to one end of a different one of the secondary windings of the other of said coils; the other ends of the windings of one of said coils being the four ports of said coupler; the other ends of the windings of the other of said coils being connected to a common junction; characterized in that: the windings are connected such that the network representations corresponding to the symmetric and antisymmetric modes of excitation are bidual.
Claim 2
Dependent Claim
105 words
A hybrid coupler comprising: two quadrifilar coils, each of which comprise two, tightly coupled N:1 transformers; one end of each primary windings of each of said coils being connected to one end of a different one of the secondary windings of the other of said coils; the other ends of the windings of one of said coils being the four ports of said coupler; the other ends of the windings of the other of said coils being connected to a common junction; characterized in that: the windings are connected such that the network representations corresponding to the symmetric and antisymmetric modes of excitation are bidual.
Claim 3
Dependent Claim
41 words
The coupler according to claim 1 wherein all the windings of one of said coils are connected in the same sense; and wherein the windings of the two transformers of the other of said coils are connected in the opposite sense.
Claim 4
Dependent Claim
37 words
The coupler according to claim 1 wherein three corresponding windings of both of said coils are connected in the same sense; and wherein the fourth winding of both of said coils are connected in the opposite sense.