Antenna Structure Using Inductive Decoupling for MIMO Isolation
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Solution Overview
Problem
Miniaturized antenna structures in communication devices often experience signal interference due to their close proximity in limited planar areas, which complicates achieving effective isolation between multiple-input multiple-output (MIMO) antennas.
Innovation Solution
The antenna structure incorporates a substrate with a grounding layer, multiple antenna layers, and passive elements such as inductance and capacitance elements that resonate at specific frequencies to reduce signal interference and enhance isolation between the antennas, even when they are small in size and closely spaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna structures are miniaturized to comply with design trends of lightweight and compactness, then the size of the antenna is reduced, but signal interference between antennas increases due to their close proximity
Solution Approach 1:
The patent introduces a decoupling structure as an intermediary element between adjacent antennas. This decoupling structure acts as a mediator that blocks or reduces the electromagnetic coupling between antennas, thereby reducing signal interference while allowing the antennas to maintain their miniaturized size and close proximity arrangement
Solution Approach 2:
The patent extracts the harmful electromagnetic coupling effect between antennas by introducing a decoupling structure that specifically targets and removes the interfering signal paths. The decoupling structure is designed to extract or block the coupled signals between antennas while allowing the antennas themselves to remain in their compact configurations
2Adaptability or versatility
If multiple antennas are disposed within a limited planar area to achieve MIMO functionality, then the communication capability is enhanced, but the isolation between antenna signals deteriorates
Solution Approach 1:
The decoupling structure serves as a mediator between multiple antennas in the MIMO system, providing isolation between different antenna signals. This allows the MIMO system to maintain its multi-antenna configuration for enhanced communication capability while the decoupling structure ensures sufficient signal isolation between each antenna element
Solution Approach 2:
The patent segments the electromagnetic field environment between adjacent antennas by introducing decoupling structures that create separate isolation zones. This segmentation allows each antenna to operate with improved signal isolation while maintaining the close proximity arrangement necessary for compact MIMO implementation
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 design effectively reduces signal interference and increases isolation between the antennas, maintaining transmission quality even in compact configurations, with the product of inductance and capacitance (K) playing a crucial role in achieving excellent isolation.
Implementation Method 1
an inductance element (170) and a capacitance element (180) which resonate at a specific frequency, so as to reduce signal interference between the first antenna layer (130) and the second antenna layer (140)
Data Source
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AI summary
An antenna structure including a substrate, a grounding layer, a first antenna layer, a second antenna layer, an inductance element and a capacitance element is provided. The substrate has a surface. The grounding layer is formed on the surface of the substrate. The first antenna layer includes a first radiating portion and a second radiating portion. The second antenna layer includes a third radiating portion and a fourth radiating portion. The third radiating portion is connected to the first radiating portion at a connection portion. The connection portion is separated from the grounding player, and the fourth radiating portion and the second radiating portion are disposed oppositely and separated from each other. The inductance element bridges the grounding layer and the connection portion. The capacitance element bridges the fourth radiating portion and the second radiating portion.