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Measurement of a slot antenna backed by a half cylindrical cavity made of conductive textiles

Reflection and radiation characteristics of a slot antenna backed by a half cylindrical cavity made of conductive textiles have been measured. Two conductive textile sheets and conductive threads configured a post-wall structure forming a cavity of a thin half-cylinder. The antenna was designed for the operation frequency around 2.45 GHz. The reflection and radiation characteristics were measured in the cases that it was planar and bent on a spherical surface, and they were compared with those of a rectangular cavity which has already been reported. As a result, the radiation characteristics did not change much by bending, and the operating band in the reflection characteristics was less shifted by bending than the slot antenna backed by a rectangular cavity. Its height was the same and its surface area decreased into 0.6 times of the rectangular cavity.