Coil-Coupled Antenna Layout for Wide-Band Display-Side Space Limits
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Solution Overview
Problem
The increasing size of display screens in electronic devices limits the installation space for parasitic radiating elements in antennas, making it difficult to achieve preferable radiation characteristics over a wide frequency band.
Innovation Solution
The antenna device includes a first radiating element, a second radiating element, a first coil connected to the power supply circuit, a second coil connected to ground and electromagnetically coupled to the first coil, and phase adjusting elements to induce current from the second radiating element to the first radiating element, enhancing radiation efficiency over a wide band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a parasitic radiating element is added to widen the band, then the frequency band is expanded, but the installation space requirement increases
Solution Approach 1:
The parasitic radiating element is nested within the space above the display device, utilizing the three-dimensional space above the device rather than requiring additional planar area. This allows band widening without increasing the footprint area occupied by the antenna system.
Solution Approach 2:
The solution transitions from a two-dimensional planar arrangement to a three-dimensional configuration by positioning the parasitic radiating element vertically above the display device. This dimensional change enables band expansion while maintaining the same installation footprint.
2Area of stationary object
If the parasitic radiating element is installed in a limited region, then the installation space is reduced, but the radiation characteristics deteriorate
Solution Approach 1:
A coupling element is introduced as an intermediary between the power supply radiating element and the parasitic radiating element. This coupling element enables effective electromagnetic coupling between the two elements even when the parasitic element is positioned in a limited region above the display, thereby maintaining good radiation characteristics despite the constrained installation space.
3Adaptability or versatility
If the display size is increased, then the user interface is improved, but the installation space for radiating elements is reduced
Solution Approach 1:
The antenna system utilizes the vertical dimension above the display device to accommodate the parasitic radiating element, rather than competing for horizontal space on the display surface. This allows larger display sizes to be implemented without sacrificing antenna installation 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
This configuration allows for high radiation efficiency over a wide band even with the second radiating element installed in a limited region, by ensuring current flow through the first radiating element, thus widening the radiation characteristics.
Implementation Method 1
a second coil connected to ground and electromagnetically coupled to the first coil
Data Source
AI summary
An antenna device includes a first radiating element, a second radiating element having lower radiation efficiency than the first radiating element, a coupling element including first and second coils that are electromagnetically coupled to each other, and first and second phase adjusting elements. The first and second phase adjusting elements induce, at a resonant frequency of the second radiating element, a predetermined proportion of current flowing through the second radiating element to the first radiating element.