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In figure a, there are three mediums from left to right. Medium 1 is labeled, air, has intrinsic impedance eta sub 0. Medium 2 is labeled, radome has thickness d and intrinsic impedance eta sub r. The medium 2 starts from z equals negative d to z equals 0. Medium 3 is labeled, air, has intrinsic impedance, eta sub 0. Medium 1 has incident waves moving in rightward direction and medium 3 has transmitted waves moving in rightward direction.

Medium 2 in figure a points to line 2 in figure b. The figure b has a narrow line 1, labeled, Z sub start expression 0 1 end expression equals n sub 0, Z sub in points to a broad line 2, labeled, Z sub start expression 0 2 end expression equals n sub r. Z sub L equals n sub 0. Line 2 ranges between z equals negative d to z equals 0.