Fig. 1. Measured loss tangent of Nacl aqueous solutions.
Fig. 2. Configuration of the proposed sensor and its detailed side view
Fig. 3. Simplified 2-port equivalent circuit of the resonator
Fig. 4. Simulated results of Transmission coefficients(S21) over Nacl solution concentrations
Fig. 5. Simulated result for electric field distribution in the Nacl aqueous solution.
Fig. 6. Photo of the fabricated prototype
Fig. 7. Measured results of Transmission coefficient (S21) for the prototype
Table 1. Dielectric properties of Nacl aqueous solutions measured around 700MHz.
Table 2. Transmission coefficient (S21) over Nacl solution concentrations on PCB boards
Table 3. Dimensions of the designed resonator
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