Miniature NFC Antenna with Extended Metallic Plates
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Solution Overview
Problem
Conventional NFC antennas are too bulky for modern mobile devices and wearable IoT devices, requiring a miniature or ultra-small NFC antenna design that efficiently transmits and receives information while maintaining performance.
Innovation Solution
A miniature NFC antenna design featuring a coil element with a ferrite core and additional metallic plate elements on both sides, which overlap and extend beyond the core, redirecting the magnetic field to enhance efficiency and size reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional NFC antenna design is used, then NFC communication function is achieved, but antenna size becomes too bulky for modern mobile devices
Solution Approach 1:
The patent transitions from a planar 2D antenna design to a three-dimensional structure by adding metallic plate elements that extend in the longitudinal direction beyond the core element. This dimensional change allows the antenna to achieve the required NFC performance in a more compact volume by utilizing spatial arrangement in multiple dimensions rather than expanding the planar area.
Solution Approach 2:
The patent combines different materials with complementary properties: a ferrite or nickel-zinc core element for magnetic field generation, copper or aluminum coil windings for electrical connectivity, and metallic plate elements for field redirection. This composite structure leverages the strengths of each material to achieve compact size while maintaining communication reliability.
2Volume of moving object
If antenna size is reduced for small devices, then device compactness is improved, but antenna radiation efficiency decreases
Solution Approach 1:
The metallic plate elements serve as intermediary structures between the coil element and the surrounding space. These plates redirect and concentrate the magnetic field lines, acting as mediators that improve the coupling between the compact antenna structure and the external environment, thereby enhancing radiation efficiency despite the reduced size.
Solution Approach 2:
The patent optimizes critical parameters including the thickness and longitudinal extension of the metallic plates, the coil winding density, and the core element dimensions. By carefully adjusting these parameters, the antenna achieves optimal radiation efficiency within the constrained size, transforming the trade-off into an optimized design space.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves improved performance and reduced size, allowing for efficient NFC communication in small devices by redirecting and strengthening the magnetic field, making it suitable for implementation in compact NFC devices.
Implementation Method 1
a coil element (2) comprising a core element (3) and coil (4) wound around the core element
Implementation Method 2
The metal plate elements hereby overlap each other and also extend beyond the respective end surface side of the core element of the loop antenna. In this way an antenna with the desired small size is provided that is capable to redirect the radiated magnetic field and increase the efficiency of the antenna in a given direction.
Data Source
AI summary
An antenna comprises a coil element comprising a core element and coil wound around the core element, the core element arranged along a longitudinal direction and having a first front surface and a second front surface. A first metallic plate element and a second metallic plate element are provided. The first metallic plate element is arranged on a first side of the core element and extends with its first end in the longitudinal direction beyond the first front surface of the core element and its second end in the longitudinal direction adjacent the core element. The second metallic plate element is arranged on a second side of the core element opposite said second side and extends with its first end in the longitudinal direction beyond the second front surface of the core element and its second end in the longitudinal direction adjacent the core element.