| 摘要 |
A transition device for joining waveguides of different characteristic impedances employs one or more sections that are stepped in height in the manner of a quarter wave transformer. Each of the sections is approximately a quarter wavelength long. A resonant element is situated at the low impedance end of the transition device. The element is resonant at a frequency within the pass band of the transition device. The invention provides improved performance over that obtained with a conventional quarter wave transformer of approximately the same length.
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