Fig. 3. (Color online) (a) Illustration of a sample structure in the horizontal configuration. A water droplet was injected at the center of the oil-filled dielectric tube. (b) Microwave near-field distribution of the oil-filled dielectric tube containing a water droplet measured in the horizontal configuration. (c) Illustration of a sample structure in the vertical configuration. (d) Microwave near-field distribution of the oil-filled dielectric tube containing a water droplet measured in the vertical configuration.
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