REFLECTION LOSS OF THE BUILDING MATERIALS IN THE UHF BAND AND THE SEMI-MICROWAVE BAND BY THE PARALLEL WIRE LINE

Abstract

The electronic devices like a cell phone and a wireless LAN using the electromagnetic wave are rapidly widespread recently. The trouble in an architectural space by the electromagnetic wave has expanded on the other hand of the electromagnetic compatibility, too. In the improvement of an architectural space, the research of the electric wave characteristic of the building material is important. In this paper, the reflection loss of the building materials generally used for the building in the UHF band (550MHz-650MHz) and the semi-microwave band (1600MHz-2600MHz) is measured. As a result of the measurement, the following have been understood. 1. In the UHF band, when the lattice type ferrite microwave absorber was used, the reflection loss of 20dB was shown. When the roof tile or carpet was used, a high reflection loss was shown. 2. In the semi-microwave band, a little large reflection loss was shown by the lattice type ferrite microwave absorber, the rock fiber acoustic material, and the aluminum heat insulator. 3. Measured building materials divided into the following four kinds. 1) Material that shows the reflection loss in the UHF band. 2) Materials that shows the reflection loss in the semi-microwave band. 3) Material that shows the reflection loss in both frequency bands. 4) Material that doesn't show the reflection loss in neither the UHF band nor the semi-microwave band.