CHARACTERIZATION OF ARCHITECTURAL GLASSES BY FREE-SPACE METHOD IN 24 GHz BAND

In this paper, the transmission characteristics of float, low-E and heat-reflective glasses were measured in 24 GHz band using the free-space method. The characteristics of float glasses were −0.7 – −3.5 dB, those of low-E and heat-reflective glasses were −19 – −33 dB and −2.6 – −9.9 dB at 24 GHz. The relative permittivity and dielectric loss tangent of the float glass were measured as 6.9 ± 0.05 and 0.02 ± 0.003. The sheet resistances of the metal foils in low-E glasses were estimated to be 1.9 – 14 Ω/sq. and it was found the sputtered films are suitable for the high shielding performance.