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Calculated characteristic impedances and electric lengths for the groove illusion of Figure 1. (a) Normalized characteristic impedance Z0x/η. (b) Normalized characteristic impedance Z0y/η. (c) Normalized electrical length βl/kΔd. (d) Normalized electrical length βMlM/kΔd. η and k are the wave impedance and the wave number in the original medium, respectively.
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