Abstract

The power transmission problem of a coaxial line probe-to-circular waveguide for TM0n multimodal excitation is rigorously treated using the conservation of complex power technique. The overall scattering matrix of the coaxial line probe-circular waveguide is deduced. Computed results for the reflection coefficient of the coaxial line probe are then compared with the experimental results, and they agree well. The power distribution of various order modes excited in a circular waveguide is investigated as a function of the probe length. Analysis shows that the power of the highest order TM0n propagation mode excited in the circular waveguide is usually the largest. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 19: 225–227, 1998.

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