Abstract
We propose a splitter feeding network for array radiations of spoof surface plasmon polaritons (SPPs), which are guided by ultrathin corrugated metallic strips. Based on the coupled mode theory, SPP fields along a single waveguide in a certain frequency range can be readily coupled into two adjacent branch waveguides with the same propagation constants. We propose to load U-shaped particles anti-symmetrically at the ends of such two branch waveguides, showing a high integration degree of the feeding network. By controlling linear phase modulations produced by the U-shaped particle chain, we demonstrate theoretically and experimentally that the SPP fields based on bound modes can be efficiently radiated to far fields in broadside direction. The proposed method shows that the symmetry of electromagnetic field modes can be exploited to the SPP transmission network, providing potential solutions to compact power dividers and combiners for microwave and optical devices and systems.
Highlights
In the microwave regime, an ultrathin corrugated metallic strip fed by a coplanar waveguide (CPW) has been investigated[10,11], which converts the guided waves to spoof surface plasmon polaritons (SPPs) in broadband with high efficiency
We propose a splitter feeding network for array radiations of spoof SPPs, in which efficient transition of SPP modes from a single corrugated metallic strip to two adjacently-parallel corrugated metallic strips
By adding phase-gradient linear U-shaped particle chains in the arms of two branch corrugated waveguides, the SPP waves can be effectively converted to far fields in the broadside direction
Summary
A three-dimensional (3D) view of the proposed structure is depicted in Fig. 1(a), which consists of three regions. The first region (Region I) is a double-side corrugated metallic strip, supporting spoof SPP propagations with the wavenumber kspp By designing the geometrical parameters, spoof SPPs which have the similar dispersion relation and mode characteristics to the single double-side corrugated strip can be supported by the branch single-side corrugated strips This can be clearly seen, from which we note that the dispersion curves of two kinds of plasmonic waveguides (green and red lines) are nearly the same. In order to get more insights on the nature of the hybridized SPP and spatial modes occurring on the two kinds of SPP transmission lines and gradient U-shaped particle array, the electric field intensities of the whole system in the vicinity of the metallic surfaces are further analyzed and investigated.
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