Mobile Terminal Antenna Current-Loop Layout for Head-Hand Signal Loss
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Solution Overview
Problem
Current mobile terminals experience significant signal attenuation in the head-hand mode due to antenna signal degradation, affecting call quality.
Innovation Solution
An antenna design featuring a circuit board with a lateral side, feed stub, parasitic stub, feed branch, and grounding branch, utilizing a gap and insulating slot to form a current loop that enhances radiation efficiency and signal performance by exciting induced currents around the gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antenna designs are used in mobile terminals, then the antenna structure is simple, but signal attenuation is severe in head-hand mode affecting call quality
Solution Approach 1:
The radiation portion is divided into a feed stub and a parasitic stub separated by an insulating slot. This segmentation allows the antenna to generate induced currents that form current loops around the gap, improving radiation efficiency and reducing signal attenuation in head-hand mode without excessive complexity
Solution Approach 2:
An insulating slot is introduced as an intermediary element between the feed stub and parasitic stub. This insulating slot enables the formation of induced currents and current loops around the gap, acting as a mediator that enhances signal performance while maintaining a manageable structural complexity
2Loss of energy
If the antenna uses a gap and insulating slot to form current loops, then radiation efficiency is improved, but the antenna structure becomes more complex
Solution Approach 1:
The antenna design utilizes electromagnetic resonance and induced currents that oscillate around the gap to form current loops. This resonant oscillation mechanism improves radiation efficiency and reduces signal attenuation by enhancing the electromagnetic field interaction, achieving better performance with controlled structural complexity
Solution Approach 2:
The antenna structure incorporates specific geometric parameters including the gap dimensions, insulating slot position and size, and the arrangement of feed and parasitic stubs. By optimizing these parameters, the antenna achieves improved radiation efficiency and reduced signal attenuation while maintaining reasonable structural 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 design improves signal sending and receiving performance by increasing radiation efficiency, reducing signal attenuation in the head-hand mode to within 3 dB, while maintaining a compact antenna structure.
Implementation Method 1
a resonance is generated by the antenna on the grounding portion, the feed stub, and the parasitic stub and excites an induced current loop winding around the gap
Implementation Method 2
excites an induced current loop winding around the gap
Data Source
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AI summary
This application relates to an antenna disposed on a mobile terminal. The mobile terminal includes a radiation portion and a circuit board, the circuit board includes a lateral side and a grounding layer, and an insulating slot divides the radiation portion into a feed stub and a parasitic stub. A gap is encompassed by the circuit board and the radiation portion. There is a feed branch that extends from the feed stub to the gap for feeding the antenna, and there is a grounding branch that extends from the parasitic stub to the gap and that is electrically connected to a grounding portion. The antenna excites a current loop winding around the gap on the grounding portion, the feed stub, and the parasitic stub. The antenna in this application forms a resonance at a position having a relatively large induced current, to ensure that a communication signal has relatively high power. Therefore, although the mobile terminal is in a head-hand mode, efficiency attenuation of the antenna can be controlled, thereby maintaining a relatively desirable call effect.