LC Resonant Antenna Decoupling Structure for Compact MIMO Isolation
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Solution Overview
Problem
The challenge is to miniaturize antennas while maintaining sufficient isolation between multiple antenna units operating at different frequency bands, which is crucial for modern communication devices with limited space.
Innovation Solution
The proposed solution involves an antenna decoupling structure that utilizes an LC resonant structure, comprising a grounding stub and a capacitor structure, to achieve decoupling for target frequency bands. This structure reduces the size of the antenna by adjusting the capacitance and inductance to match the resonant frequency with the target decoupling frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a T-shaped decoupling structure with multiple decoupling stubs is used to achieve decoupling for multiple frequency bands, then the isolation between antenna units is improved, but the total length of the antenna increases
Solution Approach 1:
The patent combines multiple decoupling functions into a single integrated LC resonant structure. The grounding stub and capacitor structure work together as one unified decoupling unit that can simultaneously or independently provide decoupling for multiple frequency bands, eliminating the need for separate decoupling stubs for each band and thereby reducing the overall antenna length.
Solution Approach 2:
The LC resonant structure is designed to serve multiple functions: it provides decoupling for at least one target decoupling frequency band while being configurable for additional bands. The grounding stub and capacitor structure can be adjusted to resonate at different frequencies, making a single structure universal for multi-band decoupling applications.
2Volume of moving object
If the antenna size is reduced to meet screen-to-body ratio requirements, then the space occupation is improved, but the isolation between adjacent antenna units deteriorates
Solution Approach 1:
The LC resonant structure acts as an intermediary decoupling element positioned between adjacent antenna units. It mediates the electromagnetic interaction between antennas by providing a controlled resonance path that cancels coupling effects, thereby maintaining isolation even when antennas are placed close together to reduce overall size.
Solution Approach 2:
The patent adjusts parameters of the LC resonant structure (such as the capacitance value and stub length) to tune the resonant frequency to match the target decoupling frequency band. By changing these parameters, the decoupling effectiveness is optimized for specific frequency bands while maintaining compact antenna dimensions.
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 LC resonant structure effectively decouples the antenna units, increasing isolation between them and allowing for miniaturization of the antenna design. This approach enables the antenna to cover multiple operating frequency bands while meeting the requirement for a smaller size.
Implementation Method 1
a first end of the grounding stub is connected to an antenna floor, to form an equivalent inductor; and a first end of the capacitor structure is connected to the antenna floor, and a second end of the capacitor structure is connected to a second end of the grounding stub, so that the equivalent inductor and the capacitor structure form an LC resonant structure
Data Source
AI summary
This application provides an antenna decoupling structure, a MIMO antenna, and a terminal. The antenna decoupling structure includes a grounding stub and a capacitor structure, where a first end of the grounding stub is connected to an antenna floor, to form an equivalent inductor; and a first end of the capacitor structure is connected to the antenna floor, and a second end of the capacitor structure is connected to a second end of the grounding stub, so that the equivalent inductor and the capacitor structure form an LC resonant structure, where a parameter corresponding to the LC resonant structure meets a decoupling requirement for at least one target decoupling frequency band. Because the resonant frequency depends on the inductance and the capacitance that correspond to the LC resonant structure, antenna miniaturization can be realized by reducing a size of each portion of the decoupling structure.