期刊
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
卷 19, 期 12, 页码 2324-2328出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2020.3032540
关键词
Antenna radiation patterns; Resonant frequency; Pins; Antenna measurements; Dual band; Loading; All-textile; body-centric communications; dual-band and dual-mode operation; wearable antenna
资金
- National Natural Science Foundation of China [61372008]
- Science and Technology Planning Projects of Guangdong Province [2014A010103014, 2015B010101006]
- Foundation of the State Key Laboratory of Subtropical Building Science [2020ZA05]
A wearable all-textile microstrip patch antenna (MPA) operating in the dual bands of medical body area network (2.36-2.40 GHz) and WiMAX (3.4-3.6 GHz), is proposed for body-centric communications. The omnidirectional radiation pattern with linear polarization for on-body link and unidirectional radiation pattern with circular polarization for off-body link are achieved by introducing reactance loading into MPA. Notably, two pairs of shorting pins are employed to tune the TM10 mode of MPA and generate a new mode of TM00, and by adjusting the spacing and radii of shorting pins, the required dual-band and dual-mode operation is achieved. Moreover, due to the adoption of textile (i.e., wool felt) as substrate and nylon conductive fabric as conductor, the antenna is flexible, totally conforming to the human body. The proposed MPA, with the dimensions of 70 mm x 70 mm x 2 mm (0.56 lambda(0) x 0.56 lambda(0) x 0.016 lambda(0) at 2.38 GHz), was fabricated and characterized. The measured results show that the reflection coefficient, radiation pattern, and gain of the antenna are slightly affected by structural deformation and human body loading. With merit characteristics, the proposed design can be well applied to wearable medical applications.
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