MEASUREMENT OF ELECTROMAGNETIC-FIELD DISTRIBUTION IN WAVE-GUIDE BASEDON ANALOGY BETWEEN H-PLANE WAVE-GUIDE-TYPE AND TROUGH-TYPE PLANAR CIRCUIT

A detailed investigation of the electromagnetic held distributions ins ide waveguide circuits is useful for physical understanding, studies o f electromagnetic coupling effects for EMC and EMI and for optimizatio n of waveguide circuit designs. In this paper, we describe how to calc ulate and measure the two-dimensional electromagnetic held distributio ns inside waveguide-type planar circuits, making use of an analogy bet ween H-plane waveguide- and trough-type surface-wave planar circuits. The measurement results are in good agreement with the results of the numerical analysis based on the normal mode expansion method.