High-resolution probe design for measuring the dielectric properties of human tissues

BioMedical Engineering OnLine

Xinran Wang¹  Hongfu Guo¹  Junkai Bai¹  Chen Zhou¹ 

[1] School of Physics and Optoelectronic Engineering, Xidian University, Xi’an, China;

关键词: Near-field probe;    Spiral resonator;    Dielectric properties;    Body measurement;    Miniaturization;   

DOI  :  10.1186/s12938-021-00924-1

来源: Springer

【 摘 要 】

BackgroundIn order to use the microwave to measure the dielectric constant of the human body and improve the measurement resolution, a small near-field probe working at 915 MHz is designed in this paper.MethodBased on the electric small loop antenna model loaded by the spiral resonator (SR), a small near-field probe was designed. The probe model is designed and optimized by the HFSS (high frequency structure simulator) software. The human tissues were tested by the manufactured probe and the relationship between the S11 parameters of the probe and the human tissues was analyzed.Results and conclusionsA probe with small size was designed and fabricated, with the overall size of 10.0 mm × 12.0 mm × 0.8 mm. The probe has a good performance with a 30.7 dB return loss, a 20 MHz bandwidth at the resonance point, and a distance resolution of 10 mm. Due to the small size and good resolution of the probe, it can be used in the measurement of human tissues.

【 授权许可】

CC BY