Electromagnetic Metamaterial with Wide Angular and Broadband Spectral Absorption

Propagation in a waveguide requires proper termination of signals to prevent reflections from interfering with the desired circuit functionality. Conventional termination designs for a two-dimensional planar waveguide topology provide maximum signal suppression in the direction perpendicular (so-called normal incidence in optics) to the structure, and can exhibit poor performance when the signal is incident at a modest angle of incident. The purpose of the innovation is a calculable metamaterial design for an absorber or termination that has broadband frequency response and low signal reflection over large incident angles.