High-Impedance Section for Mobile Terminal Antenna Interference
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Solution Overview
Problem
Mobile terminals experience a deterioration in antenna radiation gains when the housings are in a closed state due to the reduced distance between the antenna and the conductive section, leading to potential interference and signal loss.
Innovation Solution
Incorporating a first conductive section with a high-impedance section and a specific length corresponding to a prescribed wavelength, arranged in the second housing, which negates high-frequency currents and reduces negative-phase-sequence current, thereby minimizing interference and maintaining antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the first housing and second housing are closed to form a compact mobile terminal, then the device portability is improved, but the distance between the antenna and conductive section decreases causing radiation gain deterioration
Solution Approach 1:
A high-impedance section is introduced as an intermediary element between the conductive section and the antenna. This high-impedance section acts as a mediator that blocks high-frequency currents from the conductive section from reaching and interfering with the antenna, thereby preventing radiation gain deterioration while allowing the housing to remain compact.
Solution Approach 2:
The impedance parameter of the conductive section is changed by introducing a high-impedance section with specifically designed impedance characteristics (higher than the conductive section). This parameter change enables the conductive section to function differently - blocking high-frequency currents while maintaining its structural role in the compact housing design.
2Device complexity
If the conductive section is placed close to the antenna for structural integration, then the device structure is simplified, but interference increases and signal quality deteriorates
Solution Approach 1:
The high-impedance section serves as an intermediary barrier between the conductive section and the antenna. It maintains the structurally integrated design while preventing electromagnetic interference by blocking high-frequency currents from the conductive section from affecting the antenna, thus resolving the contradiction between structural simplicity and interference prevention.
3Ease of manufacture
If the conductive section is designed with standard impedance for ease of manufacturing, then the manufacturing process is simplified, but antenna performance deteriorates in closed state
Solution Approach 1:
The impedance parameter of the conductive section is specifically changed in the region adjacent to the antenna, creating a high-impedance section. This localized parameter change prevents high-frequency current flow that would otherwise deteriorate antenna performance, while the rest of the conductive section can maintain standard manufacturing practices.
Solution Approach 2:
Instead of changing the entire conductive section, only a local high-impedance section is created at the critical interface with the antenna. This local quality change addresses the specific problem of interference while minimizing the impact on manufacturing 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 solution effectively reduces antenna radiation gain deterioration in closed states while allowing the conductive section to function as part of a dipole antenna in open states, enhancing signal quality and reducing interference.
Implementation Method 1
a high-impedance section that is arranged on the end of the first section and has a higher impedance than the first section
Data Source
AI summary
A mobile terminal includes a first housing, a second housing, and a connection section. A first antenna that resonates at a prescribed wavelength is arranged in the first housing. A first conductive section is arranged in the second housing. The connection section connects the first housing and the second housing so as to transit between an open state, in which the first housing and the second housing are open, and a closed state, in which the first housing and the second housing are closed. The first conductive section includes a first section formed at a length corresponding to the prescribed wavelength, and a high-impedance section that is arranged on the end of the first section and has a higher impedance than the first section.