Antenna Cable High-Frequency Cutoff Unit for Interference Suppression
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Solution Overview
Problem
Existing smartphone antennas face instability and reduced gain due to the influence of inserted earphones and the human body, with radio wave absorbing materials like ferrite resin limiting flexibility and performance.
Innovation Solution
Incorporating a high-frequency cutoff unit with high impedance, formed using ferrite cores, at specific positions in the antenna cable to minimize the impact of earphones and the human body, ensuring consistent antenna characteristics and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrite resin is used as radio wave absorbing material, then antenna characteristics are improved, but cable flexibility is reduced
Solution Approach 1:
The patent divides the cable into multiple sections: a flexible section without ferrite resin for bending and connection, and a rigid section with ferrite resin for radio wave absorption. This segmentation allows the cable to maintain both flexibility where needed and electromagnetic shielding where required.
Solution Approach 2:
The ferrite resin is applied locally only to specific portions of the cable rather than uniformly throughout. The resin is concentrated in sections where radio wave absorption is most needed, while leaving other sections free of resin to maintain cable flexibility and ease of handling.
2Adaptability or versatility
If earphone is inserted for use, then audio function is enabled, but antenna characteristics change significantly
Solution Approach 1:
The ferrite resin acts as an intermediary element between the earphone cable and the antenna cable. It absorbs radio waves and prevents electromagnetic interference from the earphone's audio signals from affecting the antenna's reception characteristics, thereby isolating the two functions.
Solution Approach 2:
The patent extracts and isolates the radio wave absorbing function into a separate component (ferrite resin) that is positioned at the connection point between the earphone cable and antenna cable. This extraction allows the audio signals to pass through the earphone while the ferrite resin separately handles the electromagnetic interference.
3Ease of operation
If human body is close to antenna, then earphone can be used, but antenna gain is reduced
Solution Approach 1:
The patent converts the potentially harmful effect of the human body and earphone on antenna gain into a beneficial arrangement by positioning ferrite resin at the connection point. The ferrite resin absorbs and redirects electromagnetic energy, preventing the human body and earphone from causing gain reduction while still allowing normal earphone usage.
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 high-frequency cutoff unit effectively cuts off the influence of earphones and the human body, preventing characteristic changes and gain reduction, thereby maintaining stable antenna performance.
Implementation Method 1
a high-frequency cutoff unit that is formed of a material having high impedance in a high frequency and disposed at a given position of the cable
Implementation Method 2
The radio wave absorbing part is synthetic resin in which a magnetic material, e.g., ferrite powder is mixed
Implementation Method 3
a magnetic material, e.g., ferrite powder
Data Source
AI summary
An antenna includes: a connection device for connection with an electronic device; a cable connected to the connection device; and a high-frequency cutoff unit that is formed of a material having high impedance in a high frequency and disposed at a given position of the cable. The cable with a length defined by the high-frequency cutoff unit functions as an antenna.