Wireless Terminal Cover with Conductive Resonators
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Solution Overview
Problem
Wireless terminals, such as smartphones, experience a decline in antenna performance when stored in covers, which affects their radio communication capabilities, particularly in millimeter wavebands.
Innovation Solution
A wireless terminal cover with a dielectric bottom and side parts containing conductive elements that act as resonators, optimized in size and placement to resonate with the effective wavelength of radio waves, ensuring improved antenna gain even when the antenna locations are not precisely identified.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wireless terminal is stored in a cover, then the wireless terminal is protected, but the antenna performance of the wireless terminal deteriorates
Solution Approach 1:
A dielectric sheet is introduced as an intermediary component between the wireless terminal antenna and the cover structure. This dielectric sheet with specific impedance characteristics (0.05λ to 0.45λ, preferably 0.1λ to 0.3λ where λ is the wavelength) acts as a mediator that prevents harmful interactions between the antenna and the cover, thereby maintaining antenna performance while allowing the terminal to be stored in the cover for protection.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the impedance of the dielectric sheet within specific ranges (0.05λ to 0.45λ, preferably 0.1λ to 0.3λ). By optimizing these physical parameters of the dielectric material and its placement, the antenna performance is maintained despite the presence of the cover, resolving the contradiction between protection and antenna functionality.
2Reliability
If the dielectric constant of the cover material is increased, then the radio wave transmission is improved, but the antenna gain is reduced
Solution Approach 1:
The patent resolves this contradiction by changing the impedance parameter of the dielectric sheet to specific ranges (0.05λ to 0.45λ, preferably 0.1λ to 0.3λ). This parameter optimization allows the system to achieve both good radio wave transmission and maintain antenna gain, even when using dielectric materials with higher dielectric constants for the cover structure.
Solution Approach 2:
The dielectric sheet serves as an intermediary layer that decouples the relationship between the antenna and the high-dielectric-constant cover material. By positioning this sheet at specific impedance distances from the antenna, it mediates the interaction between radio waves and the cover, allowing high dielectric constant materials to be used for protection without sacrificing antenna gain.
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 conductive elements on the cover enhance the actual gain of the wireless terminal's antennas, maintaining or improving performance by acting as resonators suitable for millimeter radio waves, thereby mitigating the reduction in antenna performance associated with storage in a cover.
Implementation Method 1
A wireless terminal cover to be attached to a plate-like wireless terminal, the wireless terminal cover including a bottom part that is in contact with a backside of the attached wireless terminal while covering the backside and that is made of a dielectric having a relative dielectric constant of 1 to 10, wall parts that are in contact with sides of the attached wireless terminal while surrounding the sides and that are made of the dielectric, and a plurality of conductive elements placed in line on at least one of the bottom part and the wall part, wherein the conductive elements are formed such that a length of a longest one of lines, each of which connects any two points on the conductive element, is 0.1 to 0.4 times an effective wavelength of radio waves in the dielectric
Data Source
AI summary
A wireless terminal cover is attached to a plate-like wireless terminal. The wireless terminal cover includes a bottom part that is in contact with the backside of the attached wireless terminal while covering the backside and is made of a dielectric having a relative dielectric constant of 1 to 10, wall parts that are in contact with the sides of the attached wireless terminal while surrounding the sides and are made of the dielectric, and a plurality of conductive elements placed in line on at least one of the bottom part and the wall part. The conductive elements are formed such that the length of the longest one of lines, each of which connects any two points on the conductive elements, is 0.1 to 0.4 times the effective wavelength of radio waves in the dielectric, the radio waves being used for radio communications by the wireless terminal.