NFC Antenna Module With Winding Radiation Pattern
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Solution Overview
Problem
Conventional near field communication antennas face challenges in miniaturization due to increased thickness and difficulty in implementing appropriate inductance levels, especially in compact structures, and suffer from weakened magnetic fields and performance deterioration due to shielding effects and co-firing issues.
Innovation Solution
A near field communication antenna module with a radiation pattern winding in the vertical or horizontal direction on a magnetic body, using a magnetic substrate with terminal portions and multiple magnetic sheets stacked to form a radiation pattern, allowing for efficient signal recognition on both rear and side surfaces of portable terminals, and integrating the radiator and signal processing device for simplified mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coils are wound around a magnetic sintered body to enable near field communication from rear and side surfaces, then communication capability on multiple surfaces is improved, but antenna thickness increases making it difficult to mount in miniaturized portable terminals
Solution Approach 1:
The radiation pattern is configured to extend in the horizontal direction (width) rather than increasing vertical thickness. By winding the radiation pattern horizontally around the magnetic body, the antenna achieves multi-surface communication capability while maintaining a thin profile suitable for miniaturized portable terminals.
2Volume of moving object
If coils are wound around a compact magnetic sintered body, then antenna size is reduced, but appropriate inductance level (4 to 30 uH) cannot be implemented
Solution Approach 1:
The patent uses a composite structure combining a magnetic body (providing magnetic properties) with a radiation pattern wound around it (providing inductance). This composite configuration enables the antenna to achieve the required 4 to 30 uH inductance level while maintaining a compact size, as the magnetic body enhances the magnetic flux and thus the inductance without requiring large coil dimensions.
3Reliability
If radiation pattern is formed inside ferrite to implement high inductance, then inductance requirement is met, but magnetic field is weakened due to shielding effect
Solution Approach 1:
The patent positions the radiation pattern at specific locations relative to the magnetic body - extending horizontally from the magnetic body rather than being completely enclosed within ferrite. This local configuration allows the radiation pattern to generate strong magnetic fields in the horizontal direction (for side surface communication) while the magnetic body provides localized magnetic enhancement where needed, avoiding the shielding effect that would occur with complete enclosure.
4Reliability
If conventional spiral antenna module is used to prevent performance deterioration, then ground metal interference is blocked, but co-firing becomes difficult and additional glue is required
Solution Approach 1:
The patent integrates the radiation pattern directly with the magnetic body in a unified structure, where the radiation pattern is wound around the magnetic body rather than being a separate component requiring adhesive bonding. This merged configuration simplifies the manufacturing process, enabling co-firing of the antenna assembly with the portable terminal without requiring additional glue or complex assembly steps, while still maintaining performance stability.
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
This design enhances signal recognition rates, achieves high inductance with low resistance, simplifies production, minimizes manufacturing costs, and prevents magnetic field weakening by exposing radiation patterns appropriately within the magnetic material, while eliminating the need for additional ferrite or LTCC sheets.
Implementation Method 1
a radiation pattern winding in a vertical direction or in a horizontal direction of a magnetic body to generate a magnetic field on a rear surface and a side surface of the portable terminal
Data Source
AI summary
Disclosed are a near field communication antenna module and a portable terminal having the same, which can form a radiation pattern winding in the vertical direction or in the horizontal direction of a magnetic body to enable near field communication on a rear surface and a side surface of the portable terminal. In the disclosed near field communication antenna module, an adhesive substrate is stacked on a lower surface of a radiation substrate of a magnetic body on which the radiation pattern is formed, and a signal processing substrate and a protection substrate are stacked and formed on an upper surface of the radiation substrate, and the radiation pattern winds the magnetic body in the vertical direction or in the horizontal direction.