Loop Antennas With Ferromagnetic Core TRIZ Cases

A dual-driven groundless antenna uses tubular conductors to transmit signals without grounding.

An accordion antenna structure consolidates wake-up, communication, and energy harvesting functions into a single compact design to reduce device complexity.

Oblique antenna placement on circuit boards reduces radio disturbance from metal plate springs, preserving receiving sensitivity.

A passive RFID tag uses a single multi-turn loop antenna to support near-field NFC and far-field anti-collision protocols.

Controllable capacitors tune the resonant frequency of a compact magnetic antenna, maintaining wide instantaneous bandwidth despite reduced volume.

A magnetic sheet directs flux to an antenna coil, inducing current intensity on one side and preventing cancellation that reduces coupling efficiency.

Silicate glass doped Y-type hexagonal ferrite suppresses energy loss, resolving the trade-off between dielectric carrier size and bandwidth expansion.

A modular passive entry passive start antenna uses an insulated wire wound on a ferrite core connected to an interface head.

Segmented spatium amplifier wedges resolve non-replaceable wedge failures while maintaining hermeticity for harsh military environments.

Strategic slits in a metallic rear cover create an overlapping area that couples with the antenna, resolving signal shielding issues.

A wireless charging receiver coil integrates a ferrite sheet to concentrate magnetic flux for efficient power transfer.