MIMO Antenna Slit Configuration for Coupling Cancellation
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Solution Overview
Problem
Existing portable wireless terminals face performance degradation due to coupling between antenna elements, which increases structural complexity and cost, and lacks effective means for achieving loose coupling necessary for MIMO technology without using additional components.
Innovation Solution
The configuration of rectangular parallelepiped antenna elements disposed in parallel with slits on the conductor plates, adjusted for mutual coupling cancellation, and connected to power supply sections through impedance matching circuits, allows for loose coupling and low correlation between antennas without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antenna elements are mounted in an array for MIMO and other functions, then the communication capacity and functionality are improved, but coupling between antenna elements degrades antenna performance
Solution Approach 1:
The patent introduces a ground pattern as an intermediary element between adjacent antenna elements. This ground pattern acts as a mediator that reduces mutual coupling between antennas by providing a reference potential and isolating the electromagnetic fields of adjacent elements, thereby maintaining antenna performance while enabling multiple antennas for MIMO functionality
Solution Approach 2:
The patent divides the antenna system into spatially separated elements with specific arrangement patterns. By segmenting the antenna elements and positioning them at specific distances and orientations relative to each other and to ground patterns, the coupling between elements is reduced while maintaining the overall antenna array functionality for MIMO
2Adaptability or versatility
If the number of antenna elements is increased to support more functions, then the functionality is improved, but the device size increases
Solution Approach 1:
The patent designs antenna elements that can operate across multiple frequency bands and support multiple functions including MIMO, GPS, and other wireless communications. Each antenna element is designed with multi-band capability, allowing a single antenna to perform multiple functions rather than requiring separate dedicated antennas for each function
Solution Approach 2:
The patent combines multiple antenna elements and ground patterns into an integrated array structure where elements share common grounding and are positioned to achieve both compact size and reduced coupling. The array configuration allows multiple antennas to be densely packed while maintaining performance through the ground pattern-mediated coupling reduction
3Reliability
If additional components are added to reduce coupling between antennas, then the coupling degradation is reduced, but the device complexity and cost increase
Solution Approach 1:
The patent employs ground patterns that are automatically formed as part of the circuit board structure, eliminating the need for separate coupling reduction components. The ground patterns self-organize to provide coupling reduction through their inherent electromagnetic shielding and reference potential properties, reducing both complexity and cost while maintaining effectiveness
Solution Approach 2:
The patent extracts the coupling reduction function from separate external components and integrates it directly into the ground pattern structure of the circuit board. By taking out the need for additional decoupling components and embedding the coupling reduction mechanism within the existing ground structure, the design simplifies the overall system while maintaining coupling reduction effectiveness
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 configuration achieves high antenna efficiency, reduces coupling degradation, and enables smaller, more integrated portable wireless terminals with improved MIMO performance.
Implementation Method 1
a first antenna element 150 and a second antenna element 151 which are disposed to be close to each other substantially in parallel with each other at a predetermined distance away from the ground pattern on the circuit board 101
Data Source
AI summary
A second slit 117 and a fourth slit 119 provided in a first antenna element 150 and a first slit 116 and a third slit 118 provided in a second antenna element 151 are adjusted such that the mutual coupling between the first antenna element 150 and the second antenna element 151 in the desired frequency band is canceled, and reduces degradation in coupling between antenna elements without connecting the antenna elements through components and the like. With such a configuration, it is possible to achieve high-efficiency loosely coupled MIMO array antennas operating in the same frequency band in a portable wireless terminal.