SURFACE-WAVE LEAKAGE PHENOMENA IN COUPLED SLOT LINES

Surface wave leakage phenomena of coupled slot lines are investigated with spectral domain analysis. When the guided mode in the coupled slo t lines changes from bound mode to leaky mode, there is a frequency ra nge, called ''spectral gap,'' where only nonspectral solutions exist I f the width of the center conductor or slots is increased beyond a cer tain value this spectral gap may disappear, resulting in a frequency r ange where both bound mode and leaky mode can exist simultaneously.