Planar Conductor Antenna for Metal Casing Flux Loop
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Solution Overview
Problem
Antenna characteristics are severely degraded when a coil antenna is covered by a metal portion of an electronic appliance's casing, as the magnetic flux is obstructed, leading to poor communication performance.
Innovation Solution
The antenna device includes a first and second planar conductor arranged in a parallel configuration, with the coil antenna's winding axis parallel to both, allowing magnetic flux to flow in a large loop and couple effectively with a communication partner antenna, even when covered by a metal casing, utilizing a resonant circuit and line conductor portions to enhance coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coil antenna is covered by a metal portion of the casing to improve mechanical strength and design freedom, then the structural integrity and aesthetic design are improved, but the magnetic flux is obstructed and antenna characteristics are severely degraded
Solution Approach 1:
The patent introduces a planar conductor as an intermediary element between the coil antenna and the metal casing. This planar conductor serves as a mediator that guides the magnetic flux in a large loop configuration, preventing the metal casing from directly obstructing the magnetic flux while still allowing the antenna to be covered by the casing for structural and aesthetic purposes.
Solution Approach 2:
The patent utilizes the spatial dimension by arranging the planar conductor in a specific geometric configuration (rectangular or circular shape) that creates a large loop for magnetic flux circulation. This dimensional arrangement allows the magnetic flux to flow around the coil antenna in a plane parallel to the casing, effectively bypassing the obstruction caused by the metal portion.
2Adaptability or versatility
If the coil antenna is covered by the metal casing to improve design freedom and mechanical strength, then the structural and aesthetic qualities are improved, but the magnetic flux cannot flow in a large loop to outside the casing, severely degrading communication characteristics
Solution Approach 1:
The planar conductor acts as an intermediary that enables the magnetic flux to escape from under the metal casing. By positioning the planar conductor between the coil antenna and the metal casing, it creates a designated path for magnetic flux to flow outward in a large loop, thus maintaining communication characteristics while preserving the design freedom to cover the antenna.
Solution Approach 2:
The patent segments the magnetic flux path into distinct regions: the coil antenna generates the flux, the planar conductor guides it in a large loop configuration, and the flux eventually exits to the outside environment. This segmentation of the magnetic flux path allows each component to perform its specific function without interference from the metal casing.
3Stability of the object's composition
If a planar conductor is used as a radiating body with the coil antenna covered by metal, then the structural integrity is maintained, but the magnetic flux is obstructed and cannot couple effectively with communication partner antenna
Solution Approach 1:
The patent employs a planar conductor arranged in a rectangular or circular configuration that creates a two-dimensional loop structure. This geometric arrangement provides a large surface area for magnetic flux circulation in a plane parallel to the metal casing, enabling effective coupling with the communication partner antenna despite the antenna being covered by the casing.
Solution Approach 2:
The planar conductor is pre-positioned in a specific configuration (rectangular or circular shape) before the metal casing is assembled. This preliminary arrangement ensures that the magnetic flux has a predetermined large loop path to follow, facilitating effective coupling with external antennas even before the casing is closed and the antenna is covered.
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 maintains or improves antenna characteristics by allowing magnetic flux to flow in a large loop, increasing coupling with communication partner antennas and achieving excellent communication performance, even when the coil antenna is covered by a metal portion.
Implementation Method 1
a coil antenna with a winding axis that extends in a direction parallel or substantially parallel to the first planar conductor and the second planar conductor, and includes a first coil opening end and a second coil opening end that opposes the first coil opening end
Implementation Method 2
a capacitor that defines a loop-shaped current path together with the first planar conductor and the line conductor portion; and in which the coil antenna magnetically couples with the loop-shaped current path
Data Source
AI summary
An antenna device includes a first planar conductor, a second planar conductor that opposes the first planar conductor in a parallel or substantially parallel arrangement, and a coil element with a winding axis that extends in a direction parallel or substantially parallel to the first planar conductor and the second planar conductor, and includes a first coil opening end and a second coil opening end that opposes the first coil opening end. The first planar conductor includes a conductor outer edge, and a conductor opening including a portion that is continuous with the conductor outer edge. At least a portion of the conductor opening is positioned inside a conductor overlapping region. The first coil opening end of the coil element does not overlap the second planar conductor, and the second coil opening end of the coil element overlaps the conductor opening and the second planar conductor.