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Near Field Electromagnetic Induction (nfemi) Antennas

A technology of near-field electromagnetic and induction antennas, applied in the direction of electric short antennas, antennas, loop antennas with ferromagnetic material cores, etc.

Active Publication Date: 2022-01-28
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] While RF wireless communication can be accomplished by propagating RF plane waves through free space, NFEMI communication utilizes non-propagating quasi-static fields

Method used

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  • Near Field Electromagnetic Induction (nfemi) Antennas
  • Near Field Electromagnetic Induction (nfemi) Antennas
  • Near Field Electromagnetic Induction (nfemi) Antennas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] Figure 1A is an example electrical diagram of the first near-field electromagnetic induction (NFEMI) antenna 100 . The NFEMI antenna 100 may include a coil antenna 105 (ie, a magnetic antenna), and a short-loaded dipole 120 (ie, an electrical antenna). The coil antenna 105 may include a ferrite core 110 around which a wire 115 is wound. Short dipole 120 may include two load plates 125 and 130 . When this antenna is in close proximity to the human body, it will provide a field that is confined to the vicinity of the human body. The preferred transmit frequency is below 30MHz to ensure that the field conforms to the contours of the human body and greatly reduces far-field radiation. The coil antenna 105 and the two load plates 125 and 130 are coupled to first and second signal feed connections 135 which provide electrical connection to the receiver and / or transmitter circuitry. connect.

[0032] Figure 1B is an example circuit 132 including a first NFEMI antenn...

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PUM

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Abstract

One example discloses a near field electromagnetic induction (NFEMI) antenna having: a core material; an electrical antenna including a conductive surface; a magnetic antenna including a first coil coupled to a second coil; a feed connector coupled to one end of the first coil; a second feed connector coupled to the other end of the first coil and coupled to one end of the second coil ; wherein the first feed-in connection and the second feed-in connection are configured to be coupled to an electrical device; wherein the other end of the second coil is coupled to the conductive surface; between the first side of the magnetic antenna and the core material; and wherein the first coil, the second coil, the magnetic permeable material and the conductive surface are wound around the core material.

Description

technical field [0001] This specification relates to systems, methods, apparatus, apparatus, articles of manufacture and instructions including NFEMI antennas. Background technique [0002] Example embodiments of a near-field electromagnetic induction (NFEMI) communication system may operate near the human body by means of a combination of magnetic and electric fields without the use of transverse radiating waves. Such NFEMI systems improve the signal chain budget of wearable devices and extend their range to the entire human body. [0003] While RF wireless communication can be accomplished by propagating RF plane waves through free space, NFEMI communication utilizes non-propagating quasi-static fields. The quasi-static nature of the field is a result of the combination of antenna size and carrier frequency. Most of the energy is stored in the form of magnetic and electric fields, and a small amount of RF energy inevitably travels in free space. [0004] Smaller antenna...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/36H01Q1/48H01Q1/50H01Q7/00H01Q1/22
CPCH01Q1/22H01Q1/36H01Q1/48H01Q1/50H01Q7/00H04B5/263H04B5/22H01Q1/44H01Q7/06H01Q9/265H01Q9/30H01Q21/30H02J50/23H01Q1/273H02J50/005H04B5/26H04B5/43H01Q1/241H01Q7/08H02J50/20H04B5/72
Inventor 安东尼·凯斯拉斯利斯贝特·戈姆
Owner NXP BV