An analytical multi-rays path loss model with low complexity and high accuracy is proposed to realize the ubiquitous communication links with solid stability and full coverage. The closed-form formulas are derived to describe the path loss above 6 GHz under regularly-structured indoor environments, ensuring a clear propagation mechanism and low computational complexity. In this model, the construction and destruction of the dominant rays, i.e., the direct, reflected, diffracted, diffracted reflected, and reflected-reflected rays, on the path loss, are considered according to variation of the transmitting antenna position and propagation condition. The proposed model contains information on the sizes, structures, and materials of the environments and eliminates the influences of small scale fading by averaging the path loss over a circle with radius of ten wavelengths. Based on the measurements under the ``L-shaped'' corridor and office environments at 8 GHz band, the accuracy and extensibility of the proposed path model are verified. This work can help analyze the propagation mechanisms and construct the solver for calculating the attenuation of electromagnetic waves under indoor environments. It can also provide vital information for the link budget and node deployment for future wireless communication systems above 6 GHz.
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