Abstract
The free-space method is a standard technique for the reflectivity measurement of the absorbing material, where the horn antenna is usually used as the transmitting antenna and receiving antenna. In order to improve the ability to perform reflectivity in-situ measurement using a small sample volume and readily available instrumentation, it is necessary to study the portability of the free-space reflectivity test system. This paper describes a versatile low-cost solution for the reflectivity measurement. By designing a radiation-enhanced Vivaldi antenna and choosing the transceiver configuration reasonably, a portable and broadband reflectivity test system is proposed. As a demonstration, reflectivity measurement of the absorbing sheets is experimentally demonstrated in the band of 2–18 GHz, good consistency with the test result from the standard arch system shows that the proposed system is a very adapted candidate for the industrial application.
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