Novel Waveguide Matched Load Based on Spoof Surface Plasmon Polaritons

In this letter, a novel waveguide matched load is proposed by exploiting the natural bandstop of spoof surface plasmon polaritons (SSPPs) and the ohmic loss of metal nickel (Ni). The designed waveguide matched load composes of a periodic metallic Ni-based SSPPs and an AlN substrate, which is directly embedded in the center of the E-plane of the standard WR10 rectangular waveguide. Experimental results demonstrate that the electromagnetic waves can be efficiently captured and absorbed within specific frequency ranges, which exhibit an excellent VSWR performance with a return loss better than 18 dB from 85 to 100 GHz. The proposed prototype possesses the merits of high-absorption rate and low-implementation difficulty, which may provide a solution for further breakthroughs in the microwave and millimeter wave solid-state devices.