Mobile Antenna Multi-Stub Coupling for Full-Band Coverage
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Solution Overview
Problem
The performance of antennas in mobile devices is deteriorating due to reduced clearance caused by the inward retraction of metal frames, and existing solutions using parasitic stubs provide limited improvement.
Innovation Solution
The use of multiple parasitic stubs, coupled to the main stub through electric and magnetic field coupling, to excite resonances and enhance antenna efficiency and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the metal frame is inwardly retracted within the screen or battery cover to achieve a full-ceramic appearance, then the aesthetic appearance is improved, but the clearance inside the mobile phone decreases causing sharp deterioration in antenna performance
Solution Approach 1:
The antenna structure is segmented into a main stub and multiple parasitic stubs (first and second parasitic stubs). Each stub is independently designed to resonate at different frequencies, with the parasitic stubs coupled to the main stub through electric field and magnetic field coupling. This segmentation allows the antenna to maintain compact form factor while achieving full-band coverage through coordinated resonance of multiple segments.
2Reliability
If a single parasitic stub is added to improve antenna performance, then some performance enhancement is achieved, but the improvement is limited and bandwidth expansion is insufficient
Solution Approach 1:
Multiple parasitic stubs are combined with the main stub to form an integrated antenna structure. The first parasitic stub couples through electric field coupling to resonate at frequencies higher than the main stub, while the second parasitic stub couples through electric field and magnetic field coupling to resonate at frequencies lower than the main stub. This merging of multiple resonating elements achieves full-band coverage including low-band, mid-band, and high-band frequencies.
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 proposed solution significantly improves antenna performance by exciting multiple resonances, achieving full-band coverage and expanding bandwidth.
Implementation Method 1
the first parasitic stub is coupled to the main stub by electric field coupling, and a frequency of the resonance excited by the first parasitic stub is greater than a frequency of a resonance excited by the main stub
Implementation Method 2
The first parasitic stub and the second parasitic stub are configured to excite resonances to improve main resonance efficiency or expand bandwidth
Implementation Method 3
The second parasitic stub is coupled to the main stub by electric field and magnetic field coupling, and a frequency of the resonance excited by the second parasitic stub is less than a frequency of the resonance excited by the main stub
Implementation Method 4
The first parasitic stub and the second parasitic stub are configured to excite resonances to improve main resonance efficiency or expand bandwidth
Data Source
AI summary
An antenna includes: a main stub, a first parasitic stub, and a second parasitic stub. The first parasitic stub and the second parasitic stub are respectively arranged on two sides of the main stub. The first parasitic stub and the second parasitic stub are configured to excite resonances to improve main resonance efficiency or expand bandwidth. A frequency of the resonance excited by the first parasitic stub is greater than a frequency of a resonance excited by the main stub. A frequency of the resonance excited by the second parasitic stub is less than the frequency of the resonance excited by the main stub.