LC Tank Circuit

Sensor Integration

Embeddable electronics can be molded directly into thermoplastic parts to track their lifecycle or detect structural failures. During the injection step, the lc tank circuit is positioned within the cavity where the flowing polymer flows over the sensor. This process requires durable packaging to protect the delicate electronic elements from high melt pressures and temperatures.

Polyimide films are frequently used as substrates for these sensors due to their high thermal endurance.

Molding Effect

High pressure and shear stress during the injection phase can shift the physical alignment of embedded electronic components. When the inductor or capacitor of the molded lc tank circuit undergoes minor deformation, its resonant behavior changes. This physical drift alters the baseline signal, which leads to incorrect sensor readings during the subsequent quality inspection.

Careful gate placement minimizes the direct impact of the melt stream on the sensor package.

Signal Resolution

Material choices for the overmolding process directly affect the communication range of the embedded wireless system. The presence of conductive fillers, such as carbon black or metallic fibers, dampens the electromagnetic signal and weakens the response of the lc tank circuit. Conversely, unfilled resins like polypropylene or ABS permit clean signal transmission through the plastic wall.

This distinction governs the maximum depth at which a sensor can be placed beneath the outer surface of the part.