|Second example—Wave incident at angle to flat reflector, no gap|
In this example, the plane wave enters from the upper left at a 5.7° angle to the vertical, and strikes the flat, perfectly reflecting surface. What is shown is magnitude of the E field at a plane in the middle of the volume. The incident wave interferes with the reflected wave, resulting in a standing wave. The E field of the standing wave must still always have a z dependence which varies as sin(2πz/λ) but in this case different parts of the wave in the x direction are excited at different times. At the reflecting surface, the magnitude of the E field is zero. The box is 4 mm high in the z direction and 6mm wide in the x direction. The frequency of the incoming wave is 150 GHz, so the box is approximately two wavelengths high. The rms field strength of the incoming wave is 1 V/m.