A dual-band coil antenna for MHz band on-body wireless body area networks

Abstract

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

Single-coil dual-band antenna design for wireless capsule endoscopic communication in MHz band

“…Two resonant frequencies that match the signal peak of the transceiver can be observed at 38.5 and 57.6 MHz, with 50-mm transmission coefficients of −18.6 and −26.9 dB for the simulated results, and −14.1 and −25.8 dB for the measured results, respectively. Since there is a weak coupling between the coaxial cables at low frequencies, the measured transmission coefficient is slightly higher than the simulated result [9]. The measured reflection coefficient is lower than the simulated result as measurement errors occur when plastic wrap is used to adjust the distance between the antenna and the phantom.…”

“…As another antenna structure used for power and signal transmission in the MHz band, the inductive coupling coil can easily realize the planar antenna structure and multiple resonant frequencies [7,8,9,10]. In our previous study [9,10], the authors designed and fabricated planar-structured dual-band and triband coil receiving antennas for WCE signal reception in the 10-60 MHz band, and a single-band transmitting antenna for communication performance evaluation. However, since one coil generates only one resonant frequency, the use of multiple coils results in a relatively large size of the receiving antenna.…”