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. 2018 Sep 26;6:1900709. doi: 10.1109/JTEHM.2018.2870589

FIGURE 4.

FIGURE 4.

A) An incident RF wave impinges upon the spiral patch resulting in magnetic and electric fields formulating around the sensor. B) The sensor resonates producing a principle resonant response and subsequent resonant peaks at specific frequencies in the S11 reflection parameter.