HE11 Mode-Based Wireless Communication for a Hyperloop System Using a Dielectric-Lined Waveguide

This paper proposes a high-performance wireless communication method for Hyperloop systems using the HE11 mode in a dielectric-lined circular waveguide. The TE11 mode, used in previous studies, exhibits significant attenuation and higher-order mode interference at 3.5 GHz, while the TE01 mode provides low loss but suffers from a narrow bandwidth, limiting its practical applicability. The HE11 mode addresses the limitations of both modes by offering low loss and a wide bandwidth of up to 4.5 GHz. CST simulations were conducted based on a circular waveguide with a diameter of 3.3 m, confirming stable propagation of the HE11 mode at 3.5 GHz. In addition, mathematical analysis showed that mode dispersion is minimized when the curvature radius exceeds 23.5 km. Furthermore, to simulate realistic Hyperloop conditions, a 1/52 scaled model experiment was performed at 52 times the target frequency, experimentally validating the feasibility of HE11 mode propagation.