Stacked Flexible PCB Loop Antenna for Near Field Communication
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Solution Overview
Problem
Portable terminals face challenges in accommodating antenna devices for near field wireless communication due to space constraints, leading to reduced performance when mounted on metal battery covers.
Innovation Solution
An antenna device is designed using a stack of flexible printed circuit board layers with conductive loop patterns, allowing electrical connection through holes, which reduces the width of the antenna pattern and enables mounting at the Black Mark region of a window without requiring additional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single layer of conductive lines is used for the antenna device, then the manufacturing process is simple, but the antenna pattern width becomes too large to fit in the portable terminal
Solution Approach 1:
The patent transitions from a two-dimensional single-layer conductive line arrangement to a three-dimensional multi-layer stacked structure. By arranging conductive lines across multiple layers and connecting them through conductive holes, the antenna pattern width is significantly reduced while maintaining the required area for electromagnetic induction, enabling integration into the portable terminal's BM region.
Solution Approach 2:
The patent implements a nested structure where multiple conductive lines are arranged in different layers, with each layer containing conductive lines that are vertically aligned or offset from adjacent layers. The conductive holes penetrate through the insulating layers to connect these nested conductive lines, forming a compact three-dimensional antenna structure that fits within the limited terminal space.
2Area of stationary object
If the antenna device is mounted on a metal battery cover, then the mounting space is utilized, but the antenna performance deteriorates
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the conductive lines and the metal battery cover. This insulating layer prevents direct electrical contact between the antenna conductors and the metal surface, eliminating the harmful effects of metal interference such as signal loss and performance degradation, while still allowing the antenna to be mounted on the battery cover structure.
3Adaptability or versatility
If multiple electronic parts are mounted to reduce terminal thickness, then various functions are provided, but the mounting space for the antenna device becomes insufficient
Solution Approach 1:
The patent utilizes the vertical dimension by stacking multiple conductive lines across multiple layers connected through conductive holes. This three-dimensional arrangement reduces the horizontal footprint of the antenna pattern width, freeing up mounting space on the terminal while maintaining the antenna's electromagnetic induction area and performance.
4Area of moving object
If the antenna pattern width is reduced to fit in the terminal, then the mounting space is sufficient, but the area for electromagnetic induction becomes insufficient
Solution Approach 1:
The patent arranges conductive lines in a nested multi-layer configuration where conductive lines in different layers are vertically aligned or offset. By connecting these nested lines through conductive holes, the effective area for electromagnetic induction is increased in the vertical dimension while the horizontal pattern width remains compact, satisfying both space and performance requirements.
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 solution allows for efficient near field wireless communication without the need for separate mounting space, maintaining performance even when the battery cover is made of metal, and reduces the antenna pattern width significantly compared to traditional designs.
Implementation Method 1
an inductor-capacitor (LC) resonance loop antenna using magnetic coupling to perform near field communication
Implementation Method 2
the antenna device 10 for near field wireless communication includes a plurality of conductive lines of a loop type prepared as a single layer
Data Source
AI summary
An antenna device for near field wireless communication which may be mounted at a part of a Black Mark (BM) region of a window, and a portable terminal having the same are provided. The antenna device for near field wireless communication mounted in the portable terminal having a BM region, includes: a plurality of flexible printed circuit board layers stacked at a partial region of a lower portion of the BM region, a plurality of conductive antenna patterns of a loop type provided for the plurality of flexible printed circuit board layers, respectively, and a plurality of through holes through which adjacent conductive antenna patterns are connected to each other among the plurality of conductive antenna patterns of a loop type such that the plurality of conductive antenna patterns are electrically connected to each other so as to define one loop antenna.