Litz magnetic negative metamaterial structure and design method

By designing a Litzized magnetic negative metamaterial structure, the loss problem introduced by metamaterials in implantable medical devices was solved, the efficiency and anti-offset capability of wireless power and signal transmission were improved, and robust power and signal transmission was achieved.

CN122370142APending Publication Date: 2026-07-10LIAONING TECHNICAL UNIVERSITY
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Patent Information

Application Number
CN202610503832.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-16
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In traditional implantable medical devices, the introduction of metamaterials leads to additional losses, affects the efficiency and reliability of wireless power and signal transmission, and makes it difficult to monitor device status and adjust parameters.

Method used

Employing a Litzized magnetic negative metamaterial structure, the top and middle layers use a wiring method with multiple strands periodically interleaved, combined with a bottom-layer chip capacitor, to optimize the number of turns and segments of the metal spiral, thereby reducing losses and enhancing magnetic focusing ability.

Benefits of technology

It improves the transmission efficiency and anti-offset capability of wireless power and signal in implantable devices, reduces losses, enhances magnetic focusing capability, and achieves robust transmission of energy and signal.

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Abstract

The invention discloses a litz magnetic negative metamaterial structure and a design method, and relates to the field of wireless power transmission of implantable devices. The structure is composed of three layers of square printed circuit boards (PCB), and a top layer metal spiral, a middle layer metal spiral and a chip capacitor are sequentially arranged from top to bottom. The top layer and the middle layer are used for sequentially winding a plurality of strands of metal spirals connected in parallel from inside to outside in a staggered transposition manner through via holes to realize planar litz wiring, so that the alternating current loss is reduced; the bottom layer connects the head end and the tail end of the metal coil with the chip capacitor through via holes and is used for adjusting working frequency and magnetic conductivity. The invention further provides a Litz magnetic negative metamaterial design method. The method comprises the steps that S1, basic parameters of the receiving and transmitting coil and the metamaterial are preset; s2, optimizing the optimal number of turns; s3, selecting a better stock number range; and S4, optimizing the number of segmented strands. According to the litz magnetic negative metamaterial structure for the implantable device and the design method, the alternating current loss of the metamaterial can be effectively reduced, and the magnetism gathering capacity is improved.
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