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In this paper, rigorous Mode-Matching Technique (MMT) with Generalized Scattering Matrix Method (GSMM) is used to analyze novel hybrid SIW coupler operating at 26 GHz for 5G applications. The introduced coupler has an equal-amplitude of about -3 dB besides 90-degree at its forward and coupled output ports with more than 4 GHz bandwidth. In addition to rigorous analysis, full-wave CST simulator is used to optimize coupler structure and the results from MMT and CST are compared and discussed. The coupler structure divided into two symmetrical cascaded parts with each part having multi-port bifurcated sections. Due to symmetrical structure, analyzing one half of the coupler with MMT has been sufficient for full analysis.

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A Mode-Matching Technique (MMT) with Generalized Scattering Matrix Method (GSMM) are deployed to design and analyze H-plane SIW crossover operating at 26 GHz for 5G beamforming networks applications. The introduced crossover has an 0 dB transmission over more than 4 GHz bandwidth. During the MMT formulation, the crossover structure is divided into two symmetrical cascaded parts with each part having multi-port bifurcated sections. Due to the symmetrical structure, analyzing one half of the coupler with MMT has been sufficient for full analysis. The obtained S-parameter results from MMT are compared with full-wave CST simulator results.