Penetration loss of outer wall materials for co-existence of indoor and outdoor-use sensors at 79 GHz

Abstract

This paper presents penetration loss measurements of housing outer wall materials at 79 GHz to investigate the co-existence between indoor-use and outdoor-use radar sensors. The penetration loss was measured for building outer wall materials such as window and concrete wall. The penetration loss is also compared with 24 GHz-band because the band is available as indoor-use (e.g., non-contacted health-care monitoring) and outdoor-use (e.g., automotive radar) sensor systems. The loss of indoor-to-outdoor systems is experimentally investigated. As a result, the propagation path through outer wall material, at a distance of 5 m from the house, is found to be approximately 50 dB attenuated, which is 15 dB larger as compared with 24 GHz.