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Near-field electromagnetic induction (NFEMI) antenna

A near-field electromagnetic and magnetic field antenna technology, applied in antennas, loop antennas with ferromagnetic material cores, resonant antennas, etc.

Pending Publication Date: 2020-04-10
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small size of antennas in wearable devices, the NFMI range is much shorter than that of the whole body

Method used

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  • Near-field electromagnetic induction (NFEMI) antenna
  • Near-field electromagnetic induction (NFEMI) antenna
  • Near-field electromagnetic induction (NFEMI) antenna

Examples

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Embodiment Construction

[0038] Figure 1A is an example near-field electromagnetic induction (NFEMI) antenna 100 for a wireless device. In this example, antenna 100 is an electromagnetic induction (NFEMI) antenna. In some example embodiments, the antenna 100 includes a coil antenna 105 (ie, for a magnetic field) in combination with a short load dipole 120 (ie, for an electric field). The coil antenna 105 includes a ferrite core 110 around which a wire 115 is wound. The short dipole 120 includes a first conductive antenna surface 125 and a second conductive antenna surface 130 . The antenna 100 feed points 135, 140 are coupled to various transceiver circuitry, such as downstream radio transmitter and receiver integrated circuits (RF-ICs) (not shown here). The bandwidth and resonant frequency of the antenna 100 can be tuned using reactive components (eg, capacitors and resistor sets) integrated in the radio IC.

[0039] The short loaded dipole section 120 responds to an electric (E) field. The co...

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PUM

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Abstract

One example discloses a near-field electromagnetic induction (NFEMI) device configured to be coupled to a non-planar conductive host surface, including: a coil antenna portion configured as a magneticfield antenna; and a conductive antenna surface configured as an electric field antenna; wherein the conductive antenna surface geometrically conforms to the non-planar host surface.

Description

technical field [0001] The present specification relates to systems, methods, apparatus, devices, articles of manufacture and instructions for near field electromagnetic induction (NFEMI) antennas. Background technique [0002] This article discusses near-field electromagnetic induction (NFEMI) based body communication devices and other wireless networked devices in which the transmitter and receiver are coupled by both magnetic (H) and electric (E) fields. While RF wireless communication is achieved by propagating RF plane waves through free space, NFEMI communication utilizes non-propagating quasi-static H-fields and E-fields. [0003] H-field antennas (ie, magnetic antennas) are primarily sensitive to magnetic fields and / or generate magnetic fields primarily when driven by an electric current. Any E-field components from the H-field antenna are significantly reduced (eg, from -20dB to -60dB by a factor of 0.1 to 0.0008 (10% to 0.08%), depending on the antenna design). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/27H01Q1/36H01Q1/38H01Q7/08H01Q9/16H01Q21/00
CPCH01Q1/36H01Q1/38H01Q7/08H01Q9/16H01Q1/273H01Q21/00H04R2420/07H04R1/1016H04R1/1041H04R2225/51H04B5/22H04B5/24H04B5/00H01Q7/06H04B13/005
Inventor 安东尼·凯斯拉斯莉斯贝思·戈麦
Owner NXP BV