Antenna Device Frequency Stabilizing Circuits Isolation
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Solution Overview
Problem
In small communication terminal apparatuses, such as mobile devices, it is challenging to achieve sufficient isolation between multiple antenna elements due to their limited size, which complicates the configuration and manufacturing process, and existing methods like magnetic walls or meandering conductive patterns may not ensure adequate isolation.
Innovation Solution
The use of frequency stabilizing circuits with closed magnetic circuits, comprising coil conductors connected in series, allows for flexible antenna element arrangement and size without the need for isolation elements, by setting center frequency, passband, and matching with feeder circuits, thereby simplifying the design and reducing interference between antenna elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna elements are placed adjacent to each other in small communication terminal apparatuses, then the device size is reduced, but isolation between antenna elements becomes insufficient
Solution Approach 1:
The patent introduces a magnetic wall as an intermediary element positioned between adjacent antenna elements. This magnetic wall acts as a mediator that blocks electromagnetic field interference while allowing the antenna elements to remain in close proximity, thus maintaining small device size while ensuring sufficient isolation.
Solution Approach 2:
The patent extracts the isolation function from the antenna element design itself and separates it into a dedicated magnetic wall component. This allows the antenna elements to focus on their primary radiation function while the magnetic wall handles the isolation requirement, enabling closer placement without compromising performance.
2Object-affected harmful factors
If magnetic walls or meandering conductive patterns are used to ensure isolation between antenna elements, then isolation characteristics are improved, but configuration and manufacturing process become complicated
Solution Approach 1:
The patent changes the material parameter of the isolation structure from conventional conductive materials to magnetic materials. This parameter change allows the use of a simple planar magnetic wall geometry instead of complex meandering patterns, reducing configuration complexity while maintaining effective isolation through the magnetic material's inherent properties.
3Object-affected harmful factors
If conventional isolation methods are used, then isolation between antenna elements is improved, but design flexibility of antenna elements is reduced
Solution Approach 1:
The patent extracts the isolation function into a separate magnetic wall component, decoupling it from the antenna element design. This allows antenna elements to be freely designed in various shapes, sizes, and arrangements without being constrained by isolation requirements, as the magnetic wall independently handles the isolation function.
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 approach enables greater design flexibility for antenna elements, reduces the necessity for isolation elements, and ensures effective communication performance by stabilizing frequency and maintaining sufficient passband characteristics, even when antenna elements are adjacent.
Implementation Method 1
The first coil conductor and the second coil conductor are wound so as to define a first closed magnetic circuit. The third coil conductor and the fourth coil conductor are wound so as to define a second closed magnetic circuit.
Implementation Method 2
The first closed magnetic circuit and the second closed magnetic circuit are coupled to each other.
Implementation Method 3
a first antenna element that resonates with a first resonant frequency, a second antenna element that resonates with a second resonant frequency
Data Source
AI summary
An antenna device includes a first antenna element that resonates with a first resonant frequency, a second antenna element that resonates with a second resonant frequency, a first frequency stabilizing circuit connected to a feeding end of the first antenna element, and a second frequency stabilizing circuit connected to a feeding end of the second antenna element. The first antenna element and the second antenna element can be arranged along two sides of a case of a communication terminal apparatus, for example.