Explicit realization of a new class of lossless symmetrical lumped-element 4-port couplers with maximally flat coupling

A class of lossless symmetrical lumped-element four 1-1 port couplers with maximally flat coupling is presented. The four-port circuits can be realized using a new synthesis procedure for symmetrical four 1-1 port networks. The even- and odd-mode circuits are symmetrical lumped-element lattice networks.<
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