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Two rotary joints perpendicularly fed by the substrate integrated waveguide (SIW) feeder are presented in this paper. The planar SIW feeder excites the circular waveguide with the desired rotational symmetric mode through a circular slot, whose effect can be modeled through a horizontal magnetic current on the top surface of the SIW. First, a single-layer SIW feeder is designed in the rotary joint...
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