Antenna Coupling Coil Layout for Wideband Radiation Efficiency
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Solution Overview
Problem
Antenna devices with radiating elements extending in the same direction experience a decrease in radiation efficiency due to magnetic fields weakening each other, particularly in the low frequency band, which hinders radiation near the resonant frequency of the feed radiating element.
Innovation Solution
An antenna coupling element with a first coil connected to a first radiating element and a second coil electromagnetically coupled to the first coil, where the magnetic fields generated by both coils are opposite in direction, preventing the weakening of magnetic fields and maintaining radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the non-feed radiating element is made longer to broaden the low band frequency range, then the usable frequency range is improved, but the magnetic fields generated from the two radiating elements weaken each other, causing radiation efficiency to decrease
Solution Approach 1:
The patent introduces an antenna coupling element as an intermediary component between the feed and non-feed radiating elements. This coupling element mediates the electromagnetic interaction between the two radiating elements, controlling their magnetic field relationships to prevent mutual weakening while maintaining broadband operation.
Solution Approach 2:
The patent changes the electromagnetic coupling parameters between the radiating elements by introducing the antenna coupling element. By adjusting the coupling characteristics, the magnetic field directions are controlled to be substantially the same rather than opposite, thereby maintaining radiation efficiency across the broadened frequency range.
2Volume of moving object
If the two radiating elements are arranged to extend in the same or substantially the same direction to save space, then the device compactness is improved, but the magnetic fields generated from the two radiating elements weaken each other, causing radiation efficiency to decrease
Solution Approach 1:
The antenna coupling element serves as a mediator that enables compact co-directional arrangement of radiating elements while controlling their electromagnetic interaction. It ensures that the magnetic fields remain substantially aligned rather than opposing, allowing space-saving configuration without sacrificing radiation efficiency.
3Adaptability or versatility
If the non-feed radiating element is added to support carrier aggregation, then the adaptability for wide band coverage is improved, but the presence of the non-feed radiating element hinders radiation in the vicinity of the resonant frequency of the feed radiating element
Solution Approach 1:
The antenna coupling element acts as an intermediary that coordinates the operation of the non-feed radiating element with the feed radiating element. It ensures that the magnetic fields of both elements are substantially aligned, allowing the non-feed element to contribute to wideband coverage without creating harmful interference at the resonant frequency of the feed element.
Solution Approach 2:
The antenna coupling element provides preliminary control over the magnetic field interaction between radiating elements. By establishing the correct phase relationship in advance through the coupling element, it prevents the harmful weakening effect from occurring in the first place, ensuring stable radiation performance across all operating frequencies.
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
The solution effectively reduces or prevents the decrease in radiation efficiency, ensuring stable performance across the desired frequency range by aligning the magnetic fields of the radiating elements, thereby enhancing the antenna's ability to cover wide frequency bands without interference.
Implementation Method 1
a second coil connected to a second radiating element and electromagnetically coupled to the first coil
Implementation Method 2
a direction of a magnetic field generated in the first coil when a current flows from the first coil to the first radiating element and a direction of a magnetic field generated in the second coil when a current flows from the second coil to the second radiating element are opposite to each other
Data Source
AI summary
An antenna coupling element includes a first coil connected to a first radiating element and a feeder circuit and a second coil connected to a second radiating element and electromagnetically coupled to the first coil. The first and second coils have a relationship in which a direction of a magnetic field generated in the first coil when a current flows from the first coil toward the first radiating element and a direction of a magnetic field generated in the second coil when a current flows from the second coil toward the second radiating element are opposite to each other. The first and second coils are set such that a resonant frequency of a fundamental wave of the second radiating element with a transformer defined by the first coil and the second coil is lower than a resonant frequency of a fundamental wave of the first radiating element.