Mobile Antenna Stub Layout for Full-Band Resonance 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 conventional methods 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 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 configured to excite specific resonance modes, allowing the antenna to maintain performance despite reduced clearance. The segmentation enables each component to contribute separately to overall antenna functionality.
Solution Approach 2:
Parasitic stubs are introduced as intermediary elements that couple to the main stub through electric field and magnetic field coupling. These intermediaries enable the antenna to achieve desired resonance characteristics and bandwidth without requiring additional physical space that would compromise the full-ceramic appearance.
2Reliability
If conventional parasitic stub methods are used to improve antenna performance, then some performance enhancement is achieved, but the improvement is limited and insufficient for full-band coverage
Solution Approach 1:
Different parasitic stubs are configured with distinct local characteristics - the first parasitic stub couples through electric field coupling to excite higher frequency resonances, while the second parasitic stub couples through electric field and magnetic field coupling to excite lower frequency resonances. This local differentiation enables comprehensive bandwidth coverage.
Solution Approach 2:
The invention extends the antenna design from a single-dimensional main stub to a multi-dimensional structure incorporating multiple parasitic stubs that operate in different coupling dimensions (electric field, magnetic field, and combined coupling). This dimensional expansion enables excitation of multiple resonance modes across different frequency bands.
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 efficiency enhancements.
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 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 3
The second parasitic stub is coupled to the main stub by electric field and magnetic field coupling
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 is provided, which 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.