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Abstract:A dual-band coil antenna is proposed for MHz band on-body Wireless Body Area Network (WBAN) applications by near-field coupling, with relatively low attenuation from the human body. The proposed antenna has two operating frequencies at 48.2 and 57.6 MHz with the measured -10-dB bandwidth 47.9 -48.6 MHz and 57.1 -58.2 MHz, respectively. Matching circuits are used to reduce the antenna size and tune the resonant frequencies. A human phantom is used for the antenna simulation and measurement. Reflection and transmission coefficients and electric and magnetic field distributions of the proposed antenna are shown, and 1-g and 10-g average Specific Absorption Rate (SAR) and the maximum safety input power are calculated to evaluate the antenna's radiation safety. Antennas Propag., vol. 55, no. 7, pp. 2080-2087, Jul. 2007

is a harmful heavy metal that can be rapidly taken up and accumulated through the food chain (Cheremisinoff, 2016;Yu, Han, et al., 2017). The application of industrial wastewater, sewage sludge and mining waste to farmland may increase Cd concentrations in soil, polluting soil in China (Di Pierro et al. 2018;He et al. 2015). A recent national survey conducted by the Ministry of Environmental Protection (MEP) of China showed that about 7% of sampling sites were contaminated with Cd (Deng et al. 2019). The contaminated area of Cd and lead (Pb) has reached 20 million ha, accounting for 20% of the country's total soil area (Xue et al. 2014). In Sichuan Province, this situation is more serious: 21% of sampling sites were contaminated. Cd content in the soil of Sichuan is second only to that of Hunan (0.73 mg kg -1 )

In this paper, a capacitive coupling Low Temperature Co-fired Ceramics (LTCC) chip antenna is designed and fabricated for Wideband Code Division Multiple Access (W-CDMA) mobile handsets applications. The proposed antenna is designed by utilizing the capacitive coupling structure and feeding by a microstrip line. The proposed antenna has the advantage of good gain and easy to impedance matching.