Loop Antennas With Ferromagnetic Core TRIZ Cases

A shared receiver front end multiplexes locator coil signals to cut ADC and amplifier count while reducing crosstalk, power use, and cost.

Interfering coherent and dissipative magnon-photon coupling enables one-way microwave transmission with high isolation and low insertion loss.

Dummy-patterned antenna extensions stiffen the connection part, preventing detachment in thin devices with limited internal space.

A dense spinel ferrite layer on metal solves the tradeoff between thick magnetic films, adhesion, and electrical insulation.

A Ni ferrite core with controlled grain size and composition keeps resin-molded antenna inductance stable under temperature and stress.

Shared multiplexing, filtering, and wideband amplification cut ADC count, power use, and crosstalk in buried utility locators.

A series compensation element cancels induced voltage and current in an IPT antenna, enabling compact alignment sensing without damage.

An NFC coil mounted on the shielding bracket removes the extra PCB, cutting cost and creating airflow space to ease wireless charger heat.

High-frequency AM and magnetic coupling through shielded loop antennas improve bandwidth, isolation, and rejection of common-mode EMI.

A narrow deep Z-coil groove lets a triaxial low-frequency antenna stay under 1.4 mm thick while preserving smartphone-ready Z-axis sensitivity.

Segmented ferrite core sections cut eddy current loss while multi-frequency switching improves sonde detection and mapping of buried objects.

A barrier with penetration regions lets stacked feed layers connect nested multi-band radiators, saving space while preserving bandwidth and gain.

Insulated ferrite and adhesive layers raise mutual inductance while limiting eddy current losses and simplifying locking transponder assembly.

Controlled spacing between adjacent wire turns raises turn count while keeping target inductance for stronger antenna-coil induced voltage.

An angled magnetic-core NFC antenna widens induction coverage in wearables, reducing wrist rotation during mobile payments.

Adding spinel and ferrite oxides to Y-phase hexagonal ferrite raises resonant frequency toward 1 GHz while preserving permeability for smaller RF antennas.

A flexible dual-loop antenna wraps cylindrical bodies to maintain 20-35 mm omnidirectional RFID/NFC read range while avoiding custom ASIC tuning.

Placing front and rear NFC antennas around the battery improves sideways and perpendicular signal emission, reducing the need to angle the phone.

Bi- and Al-doped synthetic garnet shrinks below-resonance RF circulators while preserving low loss and octave bandwidth for compact transceivers.

Switchable coils with different inductance let one underground transmitter cover 0.3-50 kHz for deeper, more accurate drill head tracking.

Flat magnetic particles dispersed in resin fit between coil turns to raise permeability and lower parasitic capacitance in 10 MHz+ wireless circuits.

A raised-and-embedded spiral antenna layout improves RFID coupling and communication range without requiring a fixed reader orientation.

Multiple coil antennas in flexible PCB areas connect in parallel to improve wearable charging efficiency without extra board space.

Potassium and multi-ion doping raise hexagonal ferrite resonant frequency toward 1 GHz while preserving permeability and low magnetic loss.

Two ferrite-wrapped coils linked by a conductor network boost coupling and magnetic flux for NFC and wireless charging in narrow openings.

Series-connected inductor coils with selectable taps tune one compact antenna across NFC, RFID, and charging bands for better transfer efficiency.

Resonant capacitance tuning keeps amplification-loop current high even with fixed capacitor values, extending wireless coverage with lower power.

Two NFC antenna wings set near 90° improve multi-directional magnetic coupling and reduce reader alignment issues during lighting device programming.

Stacking the LF antenna inside the NFC antenna helps a vehicle door handle preserve communication range while limiting field coupling.

A parallel-series inductive antenna circuit uses capacitive phase shifting to generate robust positioning signals with fewer elements and less EMI sensitivity.

Adjustable RLC antenna circuits improve wireless power and sensor data transfer in surgical stapling systems while reducing energy loss.

A spiral antenna with its axis parallel to the substrate improves smart card reader coupling and communication range across multiple orientations.

Na or K doping in Y-phase hexagonal ferrites raises resonant frequency toward 1 GHz while preserving permeability and low loss for smaller RF antennas.