Artificial Magnetic Conductor Antenna Thickness
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Solution Overview
Problem
Current mobile communication devices with metal back covers often suffer from poor antenna radiation efficiency due to the metal shielding, requiring a minimum distance between the antenna and the metal back cover, which increases device thickness.
Innovation Solution
An artificial magnetic conductor comprising a base board with a first conducting element and a second conducting element, along with a first lumped element, is placed between the antenna and the metal back cover, generating a current in the same phase as the antenna, thereby improving radiation efficiency without the need for additional interconnecting components, and reducing the device's thickness and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the antenna and the metal back cover is increased to ensure radiation efficiency, then the antenna radiation efficiency is improved, but the device thickness increases
Solution Approach 1:
An artificial magnetic conductor (AMC) structure is introduced as an intermediary layer between the antenna and the metal back cover. This AMC structure, comprising a base board with conducting elements and lumped elements, acts as a mediator that prevents harmful interactions between the antenna and metal back cover while allowing the antenna to be positioned closer to the back cover, thus reducing device thickness without compromising radiation efficiency
Solution Approach 2:
The invention changes the electromagnetic parameters of the space between the antenna and metal back cover by introducing the AMC structure with specific conducting elements and lumped elements. This transforms the electromagnetic environment, creating a virtual magnetic wall that improves current distribution and phase characteristics, enabling the antenna to operate efficiently at reduced distances from the metal back cover
2Length of moving object
If the distance between the antenna and the metal back cover is reduced to decrease device thickness, then the device thickness is reduced, but the antenna radiation efficiency deteriorates due to reverse current neutralization
Solution Approach 1:
The artificial magnetic conductor serves as a protective intermediary that prevents the harmful reverse current effect from occurring. By placing the AMC structure between the antenna and metal back cover, it creates a controlled electromagnetic interface that maintains constructive current interference even at reduced distances, eliminating the need for large separation distances while preserving radiation efficiency
Solution Approach 2:
The invention converts the potentially harmful interaction between the antenna and metal back cover into a beneficial effect. By carefully designing the AMC structure with specific conducting and lumped elements, the close proximity that would normally cause reverse current neutralization is transformed into a configuration that produces constructive current interference, improving radiation efficiency while reducing device thickness
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 enhances antenna radiation efficiency and reduces the overall thickness and volume of the electronic device by ensuring the current flows in the same phase as the antenna, eliminating the need for additional interconnecting structures.
Implementation Method 1
the current is generated the same phase as the current in the antenna, which results good radiation efficiency
Implementation Method 2
at least one artificial magnetic conductor located between the back cover and the antenna
Data Source
AI summary
An artificial magnetic conductor comprising a base board, a first conducting element, a second conducting element and a first lumped element is provided. The first conducting element is disposed at a first side of the base board. The first conducting element includes an opening. The second conducting element is disposed at a second side of the base board. The first lumped element is disposed on the corresponding first conducting element. An electronic device including the artificial magnetic conductor is also provided.