Frequency Dependence of Penetration through Gaps into Buildings at mm Wave

Measurements in the range of 10-20GHz, 22- 30GHz and 50-67GHz are presented in this paper that show the benefit of using gaps in building infrastructure to substantially improve the penetration loss in the order of 10dB or more. Increasing the frequency substantially improves the opportunity to penetrate through the same size gap as it becomes electrically larger. The measurement setup used in this work involves the use of a ground floor infrared reflector glass door whereby the effect of the gaps can be compared both by closing the door and sealing the gaps with a conductor in order to identify the difference in penetration. Simulations were also carried out to verify the waveguiding and standing wave effects in the gaps.