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A compact ultra-wideband printed ridge gap waveguide directional couplers for millimeter-wave applications are presented in this paper. A multi-layer coupling technique between two resonant patches is adopted to achieve a wider operating bandwidth with better amplitude and phase balance compared to single-layer technology. For this purpose, a systematic design procedure is deployed to achieve several coupling values in the range of 3&#x2013;10 dB over a wide frequency bandwidth centered at 30 GHz. A 3-dB hybrid coupler is fabricated and measured, where a bandwidth of 12 GHz (about 38&#x0025; fractional bandwidth) from 25 GHz to 37 GHz is achieved. In addition, the phase balance is <inline-formula> <tex-math notation="LaTeX">$90^{o}$ </tex-math></inline-formula> &#x00B1; <inline-formula> <tex-math notation="LaTeX">$5^{o}$ </tex-math></inline-formula> over 38&#x0025; fractional bandwidth with an amplitude balance of 3.4 &#x00B1; 0.5 dB over a 26.5&#x0025; centered at 30 GHz. The proposed couplers with superior characteristics such as compactness, low loss, and low dispersion are considered a good candidate for millimeter-wave applications such as the fifth-generation (5G) wireless communications.

Ultra-Wideband Compact Millimeter-Wave Printed Ridge Gap Waveguide Directional Couplers for 5G Applications