A multidirectional frequency splitter with band-stop plasmonic filters

We propose a multidirectional frequency splitter with band-stop plasmonic filters, in which a double-period grating structure is adopted to produce band-stop filtering features. The multidirectional frequency splitter consists of three specially designed metallic gratings with finite thickness. Better isolation between different metallic gratings is achieved at the lower frequencies. The experimental verification of the frequency splitter is implemented at the microwave frequencies with excellent agreements to full-wave simulations. A four-way THz frequency splitter excited by the cylindrical wire is also proposed and simulated to show how the design can be scaled down to the THz frequencies for the potential applications.