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In this paper, design and analysis of a transverse electromagnetic (TEM) mode rectangular coaxial waveguide for a mobile 5G millimeter wave (mmWave) antenna module are presented. General structures of 5G radio frequency (RF) module for mobile sub-6 GHz and mmWave applications are also discussed in this paper. Thorough analysis of transmission line and waveguide structures at mmWave frequency band is essential and fundamental information to design highly integrated RF front-end modules. Theoretical design equations of the waveguide, such as impedance, loss, and radiation are presented, and the equations are verified by a full wave 3D FEM electromagnetic simulator. Impedance value of the rectangular waveguide structure was calculated using the conformal mapping method. Theoretical operation frequency bandwidth and design guide are also presented. The characteristics and analysis of the rectangular coaxial waveguide structure presented in this paper is easily scalable to other frequency bands. The proposed design equations are also applicable to various planar layer-by-layer integrated circuit (IC) or module manufacturing process.

Design and Analysis of a TEM Mode Rectangular Coaxial Waveguide for Mobile 5G Millimeter Wave Antenna Module Applications