A forced-mode composite resonator is used on a moisture sensor to characterize humidity percent of honey at the microwave regime. Sensors of two different shapes, one rectangular and one circular, are designed and fabricated using commercial phenolic sheets. The resulting resonant frequency of the sensor changes as a function of the humidity contained in the sample. Honey samples are placed inside small glass bottles and this foreign material is taken into consideration. Measurement results are as expected and when the effective permittivity value of the samples is too high the modes will interchange.
Using a forced-mode composite right/left-handed resonator, we designed and proved a permittivity sensor at the microwave regime. We use this sensor to measure humidity percent of honey and potatoes. The sensor resonant frequency can be modified without altering its physical length. With this characteristic a bigger frequency bandwidth can be covered. In addition to that, the second and third mode can also be used for measuring increasing even more the sensor frequency bandwidth. It can be clearly appreciated that one mode is magnetic and the other electric. Not only they differ in their amplitude but also in their quality factor. By moving the position that forces the modes, the first mode frequency value will increase while the second one will decrease. This will happen until the modes meet each other and then they will exchange places.
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