Coupled Antenna Branch Structure for Middle-Band Bandwidth
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Solution Overview
Problem
Existing mobile terminal antennas suffer from insufficient dual-branch intermediate and high frequency bandwidth coverage, leading to suboptimal radiation efficiency in the middle band.
Innovation Solution
An antenna structure with a resonant branch, coupling branch, and a suspended coupling metal body, along with a feeding structure and matching circuit, enhances coupling adjustability and improves radiation efficiency in the middle band by spatial coupling and frequency selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antenna structures are used, then the device complexity is low, but the radiation efficiency in the middle band is insufficient
Solution Approach 1:
The antenna structure is divided into multiple functional branches including a resonant branch, a coupling branch, and a feeding branch. Each branch serves specific functions: the resonant branch provides resonance at target frequencies, the coupling branch enables energy transfer between bands, and the feeding branch delivers power. This segmentation allows optimization of each branch's performance independently, achieving high radiation efficiency in the middle band while maintaining manageable overall complexity.
Solution Approach 2:
The antenna structure employs a nested configuration where the coupling metal body is positioned within the space between the resonant branch and coupling branch. The feeding structure is integrated into the resonant branch, and grounding points are strategically placed along the structure. This nesting approach maximizes space utilization and enhances coupling effectiveness without proportionally increasing device complexity.
2Adaptability or versatility
If more antenna elements are added to improve bandwidth coverage, then the frequency coverage improves, but the device complexity increases
Solution Approach 1:
The antenna structure achieves dual-band and intermediate-band coverage through a unified multi-branch design. The resonant branch resonates at high frequencies, the coupling branch transfers energy to intermediate frequencies, and the coupling metal body enables interaction between bands. This multi-functional structure provides broad frequency coverage (including middle band, high band, and intermediate band) without requiring separate antenna elements for each band, thereby avoiding excessive complexity.
Solution Approach 2:
The antenna structure utilizes spatial dimensionality by positioning the coupling metal body in three-dimensional space between the resonant and coupling branches. The structure extends in multiple directions with branches arranged to optimize electromagnetic coupling. This spatial arrangement enables frequency multiplication and bandwidth expansion without simply adding more planar elements, achieving versatile coverage with controlled complexity.
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 antenna structure effectively increases radiation efficiency in the middle band by optimizing coupling between branches and incorporating a matching circuit, expanding bandwidth and improving performance across intermediate and high frequencies.
Implementation Method 1
the coupling metal body is suspended in the air and is respectively coupled to the resonant branch and the coupling branch
Implementation Method 2
improve the radiation efficiency of the antenna structure in the middle band
Data Source
AI summary
The present application discloses an antenna structure and a terminal device. The antenna structure includes: a resonant branch, a coupling branch, a coupling metal body, and a feeding structure. The resonant branch is provided with a feeding point, one end of the resonant branch is coupled to the coupling branch through a gap, the other end of the resonant branch is grounded through a first grounding point, one end of the coupling branch is coupled to the resonant branch through the gap, the other end of the coupling branch is grounded through a second grounding point, the coupling metal body is suspended in air and is respectively coupled to the resonant branch and the coupling branch, one end of the feeding structure is connected to the feeding point of the resonant branch, and the other end of the feeding structure is grounded.