posted on 2023-06-02, 08:03authored byTaisong Pan, Chunhong Zhang, Senhao Zhang, Dengji Guo, Maowen Xie, Min Gao, Zhenlong Huang, Jia Zhu, Yuan Lin
This article describes the implementation
of a wireless human motion
detection with interference resistance to untargeted deformations
based on a stretchable patch antenna with fractal design. By rationally
incorporating the Hilbert fractal pattern in the conductive patch
and ground plane, the patch antenna shows a mechanical stretchability
of ∼40% and a maximum gain of 2.95 dB at 2.5 GHz. Furthermore,
the influence of the fractal order on the mechanical stretchability
and radiation properties of the stretchable patch antenna is discussed.
The resonant frequency of the stretchable fractal antenna demonstrates
highly selective sensitivity to different deformations; i.e., it remains
almost unchanged with bending deformations and is linearly dependent
on the tensile strain. Remote detection of joint motions is experimentally
verified by a wireless on-body strain sensor based on the fractal
design-based stretchable microstrip antenna.