) branch line coupler. In this model a circuit is decomposed into several two or multi ports sub-circuits. Next, the proposed FDTD model is used to determine the scattering parameters of the sub-circuits. With a proper connection of the scattering...

quadrature hybrid couplers are useful in communications systems and measurement applications. Many

3-dB, 90-deg. hybrid directional couplers have been developed for narrowband use but, with growing interest in ultrawideband (UWB...

Here, we demonstrate that transformation optics can be used to produce 2-D

non-magnetic waveguide couplers with no reflections. Our approach consists of using a scaling

function for reflection suppression and introducing an auxiliary...

Based on the theory of multi-hole waveguide directional couplers, an X-band multi-hole directional coupler with a folded substrate-integrated waveguide has been designed and fabricated. Simulation results show that the proposed coupler has isolation...