Nonreciprocal reflection effects (adapted from [30]). (a, b) Numerically computed scattering patterns (forward-incidence and time-reversal channel, respectively) for the dominant harmonic orders, by assuming f_c = 5 GHz, f ₀ = 250 MHz, and θ ₁ = 60°. (c, d) Same as above (but including higher-order harmonics) for a more realistic parameter configuration featuring f_c = 9.5 GHz, f ₀ = 1.25 MHz, d = 14 mm and θ ₁ = 34°. (e, f) Corresponding measured results.