Abstract
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.
Highlights
In 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
The probe consists of a 7-turn spiral resonator (7-SR) with a width of 0.2 mm and a small loop antenna with a width of 0.5 mm which is designed around the SR to excite it
Unlike most resonators used for near-field imaging in the past, the probe designed in this article uses only one port to power supply
Summary
In 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. Method: Based on the electric small loop antenna model loaded by the spiral resonator (SR), a small near-field probe was designed. Due to the small size and good resolution of the probe, it can be used in the measurement of human tissues. Physiological changes of the water content, protein content, types and cell structure of biological tissues will lead to changes in its dielectric properties. The open-ended coaxial reflectometry method [4, 5] is widely used in the study of the dielectric properties of biological tissues.
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