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Design of wideband multi-layer quadrature hybrid couplers with butterfly shaped resonators, International Journal of Microwave and Wireless Technologies
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Sami TANTAWI, Professor (Full), Stanford University, CA, SU, SLAC National Accelerator Laboratory
PDF) Short-slot hybrid coupler in gap waveguide at 38 GHz
Improved Narrow-Wall Short Slot Coupler Design Exhibiting Significant Increased Bandwidth and Low Cost Production