Lossless Transformers

        Lossless flux-coupled transformers

        Transformer floating-admittance matrix

Baluns and Hybrids

        Ideal Baluns and Hybrids

        Hybrid Transformers, a survey by Sartori

Model Fitting

        Fitting Auto Transformer S-Parameters

        Fitting Transmission Line Transformer S-Parameters

Quadrature coupler ,  the Cappucci wireline coupler