Antenna Device Loop Current Path Capacitor Gap
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Solution Overview
Problem
Existing antenna devices that use metal members as radiation elements face challenges in achieving both high gain and space-saving designs, as enlarging the loop opening to improve magnetic flux radiation function is restricted by spatial constraints.
Innovation Solution
The antenna device incorporates a conductive member with a first and second conductor portion connected by a coil element and a capacitor, forming a loop-shaped current path, which enhances magnetic coupling with a coupling coil, and can utilize the housing of an electronic apparatus as a radiation element, reducing the need for dedicated antenna components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the loop opening is enlarged to improve magnetic flux radiation function, then the radiator function is improved, but the antenna size increases
Solution Approach 1:
The patent introduces a capacitor to change the electrical parameters of the loop structure, creating a resonant circuit that enhances the radiator function without requiring physical enlargement of the loop opening. The capacitor modifies the impedance and resonant frequency characteristics, allowing compact loops to achieve high radiation efficiency.
Solution Approach 2:
The patent utilizes the z-dimension (vertical direction) by positioning the capacitor to overlap with the loop structure in the plan view, creating a three-dimensional configuration. This allows the magnetic flux to extend in the vertical direction, effectively increasing the radiation area without expanding the planar footprint of the antenna.
2Reliability
If the loop opening is enlarged to improve magnetic flux radiation function, then the gain is improved, but the space usage increases
Solution Approach 1:
The patent embeds the capacitor within or adjacent to the loop structure, with the capacitor overlapping the loop in the plan view. This nested configuration allows the capacitor to be integrated into the existing antenna footprint, adding functional volume without increasing the planar area occupied by the antenna device.
3Reliability
If dedicated antenna components are used to improve coupling efficiency, then the coupling between antenna and communication partner increases, but the component count and complexity increase
Solution Approach 1:
The patent makes the housing serve multiple functions: it provides mechanical support for the electronic device and simultaneously acts as a radiation element (radiator) for magnetic flux. The housing conductor portion is designed to function as part of the antenna system, eliminating the need for separate dedicated radiation components and reducing overall device complexity.
Solution Approach 2:
The patent merges the housing structure with the antenna function by designing the housing to include conductor portions that serve as radiation elements. The first conductor portion and second conductor portion of the housing are integrated into the antenna system, combining structural and electromagnetic functions into a single component.
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 configuration improves radiator function without increasing antenna size, achieving higher gain and coupling efficiency with communication partner antennas while minimizing component count and space usage.
Implementation Method 1
the coupling coil is magnetically coupled to the loop-shaped current path
Implementation Method 2
a capacitor, and the first conductor portion includes a conductor opening and a gap that connects the conductor opening and an outer edge of the first conductor portion; wherein the capacitor crosses the gap
Data Source
AI summary
An antenna device includes a wiring board, a conductive member including a first conductor portion and a second conductor portion electrically connected to each other, a coil element including a coupling coil to be connected to a feed circuit, and a capacitor. The first conductor portion includes a conductor opening and a gap that connects the conductor opening and an outer edge of the first conductor portion, and the capacitor crosses the gap. The second conductor portion is connected to two points of an inner edge of the conductor opening, and, together with a portion of the first conductor portion and the capacitor, defines a loop-shaped current path. The coupling coil is magnetically coupled to the loop-shaped current path.