Figure 1: Reflection-free microwave propagation in a waveguide. | Nature

Figure 1: Reflection-free microwave propagation in a waveguide.

From: Round the bend with microwaves

Figure 1

Adapted from ref. 3/Am. Phys. Soc.

Ma et al.3 have simulated the propagation of microwaves in a metawaveguide. The proposed device contains a hexagonal array of metal cylinders displaying an asymmetry along the cylinder axis — a gap between one end of the cylinders and the enclosing metal plate. The two sections shown are joined together such that the position of the gap is inverted between them (on the left the gap is at the bottom, whereas on the right it is at the top). This configuration allows microwaves to travel along the bent interface between the two sections with negligible backward reflection at the two 120° turns.

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