Short-slot E- and H-plane waveguide couplers with an arbitrary power division ratio

TitleShort-slot E- and H-plane waveguide couplers with an arbitrary power division ratio
Publication TypeJournal Article
Year of Publication2011
AuthorsRuiz-Cruz, J. A., J. R. Montejo-Garai, and J. M. Rebollar
JournalInternational Journal of Electronics
Date PublishedJan.
AbstractShort-slot couplers are a particular type of waveguide directional coupler commonly used due to their compact size in comparison with other waveguide configurations. The common short-slot Riblet coupler is used as a 3 dB hybrid (equal power division to the coupled and the through ports) in microwave networks supporting high power and providing good performance over a moderate bandwidth. In this article, the general case of short-slot couplers with arbitrary power division is presented, in E- or H-plane configuration. Moreover, it is shown that the port closer to the input can handle either more or less power than the further port, depending on the design parameters and the length of the main guide of the coupler. Several designs in E- and H-plane are shown to introduce the concept. In addition, two experimental prototypes, with either rectangular waveguide interfaces or coaxial input/output, are manufactured and tested showing good agreement with the expected results.
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