Figure 2

(a) Experimental setup for wide angle measurements. (b) Normalized electric field of the output beams at \(+ 15^{ \circ }\), \(0^{ \circ }\) and \(- 15^{ \circ }\) for frequencies from 130 to 180 GHz. (c) Measured beam offset of the output beam and its radius as a function of the input beam angle.