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Passive Microsensor Based on LC Resonators for Substance Identification

D.A. Sanz Becerra1 E.A. Unigarro Calpa1 J. Osma1 F. Segura1
1Universidad de los Andes, Bogotá, Colombia

RF simulation of the system. The magnitude of the electric field is shown on the top surface of the sensor. In the middle of this surface, where the IDC is located, the largest magnitude of electric field is obtained, as it was expected. The magnetic field magnitude is shown on the surface of the coupling antenna. Magnetic field lines and arrows are shown as they pass through the sensor and the antenna making showing where the magnetic coupling between them originates.

A scheme for inductive wireless powering and readout of passive LC sensor is presented. The sensor’s inductor is designed as a planar square coil and is used as the power receiving component. The capacitor is connected directly to the inductor and it was designed as an interdigital capacitor. With a transmitting
coil (coupling antenna), an electromagnetic field is generated which couples with the sensor, affecting the impedance of the coupling antenna. This work studies the effects of permittivity variations in a capacitive transducer. All the fabrication and characterization processes were carried out at the clean room of the Universidad de los Andes. The design and the simulation of the wireless passive micro-sensor based on LC resonators were made using COMSOL-4.2a.

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