Meaning
Reduction in electromagnetic signal strength as radio frequency waves propagate through solid metal mould plates limits wireless sensor transmission ranges. High tool steel attenuation forces embedded wireless sensors to operate at elevated power levels or utilize specialized slot antennas routed to tool surfaces. High electrical conductivity and magnetic permeability of hardened tool steels like H13 absorb RF energy at microwave frequencies.
Signal loss requires strategic placement of dielectric wave channels or external antenna extensions to achieve reliable data transmission.
Electromagnetic Loss
Skin depth effects limit RF signal penetration through conductive steel structures to a few micrometres at gigahertz frequencies. Managing tool steel attenuation requires routing radio signals through non-metallic structural inserts or open parting line gaps. High-frequency signals suffer higher absorption rates, making lower sub-gigahertz bands more suitable for deep cavity sensor embedding.
RF path planning must account for wave scattering caused by internal cooling channels and ejector pin bores.
Antenna Design
Customized slot antennas recessed into tool plate faces radiate signals outward along parting line openings. Ceramic fill materials protect antenna elements from mechanical damage while matching dielectric properties to maximize radiation efficiency. Impedance matching networks offset metal loading effects on antenna resonant frequency.
System Optimization
Transceiver modules boost transmission power dynamically when received signal strength drops below operating thresholds. Receiver nodes mounted on external tool plates capture scattered RF energy using high-gain directional antennas. Multiple antenna arrays provide spatial diversity, overcoming signal loss caused by metal blockage during tool movement.
Signal mapping studies during tool design identify optimal sensor placement locations to minimize path attenuation.
