A Closed RF Wave-Applicator to Study the Biological Effects of Mobile Communication Systems

According to the growing trend in using cellular communication systems and frequent and longtime usage of mobile devices by everybody, studying biological effects of the electromagnetic waves which propagate from these cell-phones is critical and social request. First estimation is that this effect is proportional to the field intensity, frequency and duration of exposure. This paper presents a closed RF wave-applicator, providing a uniform electromagnetic field in a closed area to expose the under-study biological tissue in 3G and 4G cellular frequency bands that is 1920-1980 MHz for uplink and 2110-2170 MHz for downlink. To generate desired amplitude of electric field with suitable uniformity in a specific region, a rectangular waveguide with a square cross-section is proposed. Also, a specified shape of printed probes is designed to couple the power from input coaxial cables to the waveguide to cover the mentioned bandwidth. A testing tube containing distilled water is placed in the middle of the wave-applicator and the whole structure is simulated. S-parameters and electric field amplitude are presented in both cases of absence and presence of testing sample and finally, the performance of the structure is investigated through a Vector Network Analyzer and measured results are presented.