Mobile Terminal Antenna With Closed Ring Ground Isolation
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Solution Overview
Problem
In mobile terminal antennas, strong mutual coupling between radiating elements reduces performance and increases size, making it challenging to achieve effective decoupling and efficient use of available space.
Innovation Solution
A compact antenna design featuring a closed ring connected to a ground plate, with radiating elements connected via microstrip, utilizing radiation and polarization diversity to reduce coupling and improve isolation, while optimizing the use of clearance area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced, then the terminal device size is reduced, but coupling between antenna elements becomes stronger
Solution Approach 1:
The patent utilizes the clearance area of the ground plate, which is a two-dimensional space, to position the radiating elements. By arranging elements in specific spatial relationships within this clearance area and using the ground plate's geometry to provide isolation, the design achieves effective decoupling without increasing the overall antenna volume, thus resolving the contradiction between size reduction and coupling reduction.
2Object-generated harmful factors
If coupling between antenna elements is reduced, then antenna performance is improved, but the space occupied by the antenna increases
Solution Approach 1:
The patent applies different structural characteristics to different regions of the antenna. The ground plate provides a common reference plane and isolation for all radiating elements, while each element is positioned in a specific location within the clearance area optimized for its radiation pattern. This localized optimization allows compact arrangement while maintaining low coupling between elements.
3Productivity
If multiple antennas are disposed inside the terminal, then system capacity is improved, but mutual coupling is caused and MIMO antenna performance is reduced
Solution Approach 1:
The patent divides the antenna system into multiple independent radiating elements (first, second, and third radiating elements) that are spatially separated within the clearance area of the ground plate. Each element can be independently fed and controlled, enabling MIMO functionality. The ground plate structure provides natural isolation between these segmented elements, reducing mutual coupling while maintaining system capacity.
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 design achieves improved isolation and reduced size, enhancing the signal transceiving performance of mobile terminals by minimizing coupling between radiating elements and effectively utilizing available space.
Implementation Method 1
A main radiation direction of the first radiating element is a first direction, a main radiation direction of the second radiating element is a second direction... A polarization manner of the first radiating element is the same as a polarization manner of the second radiating element, and a polarization manner of the third radiating element is orthogonal to the polarization manners of the first radiating element and the second radiating element.
Data Source
AI summary
The application disclose an antenna. The antenna includes a first radiating element, a second radiating element, a third radiating element, and a closed ring, where the first radiating element is connected to a first feed point, the second radiating element is connected to a second feed point, and the third radiating element is connected to a third feed point; the closed ring is configured to be disposed in a clearance area of a ground plate, and configured to connect to the ground plate; the first radiating element, the second radiating element, and the third radiating element are connected by using a microstrip, to form a radiator; the third radiating element is disposed between the first radiating element and the second radiating element.