In this work, transmission coefficient S21 was measured through a waveguide. The electromagnetic wave entered into a waveguide through a horn at one end and it was measured at the other end. By inserting a parasitic dipole inside the waveguide, the wave amplitude at lower adjacent frequency of dipole resonant was amplified. This effect is similar to that of Yagi-Uda antenna in open space. It is stated in textbook that a Yagi-Uda antenna can diffract the electromagnetic wave in open space and focus the power in forward direction. However, a dipole inside a waveguide cannot diffract electromagnetic wave from the open space. The observation in this work indicated that the wave was amplified by the parasitic dipole.
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