Dual-Radiator Antenna for Metal Housing Touch Interference
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Solution Overview
Problem
In mobile terminals with metal housings, user touch degrades antenna signals due to direct contact, which existing designs fail to effectively mitigate without compromising appearance or performance.
Innovation Solution
A dual-radiator antenna system where a first radiator operates in a normal frequency band and a second radiator, with a higher frequency, takes over when touched, forming an outer frame with ground branches, and a matching circuit adjusts impedance to ensure continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metal housing design is used to meet user appearance demands, then the appearance quality is improved, but the antenna signal is degraded when the user touches the metal housing
Solution Approach 1:
The antenna system is segmented into two independent radiators operating in different frequency bands. The first radiator operates in the normal frequency band, while the second radiator operates in a higher frequency band. When the user touches the metal housing causing signal degradation in the first radiator, the system switches to the second radiator which operates at a different frequency and is not affected by the touch, thus maintaining antenna signal quality while preserving the metal housing appearance.
2Reliability
If the antenna is exposed on the metal housing, then the antenna performance is optimized, but the signal is degraded when the user touches the antenna
Solution Approach 1:
The system changes the operating frequency parameter of the antenna. The first radiator operates at a normal frequency, and the second radiator operates at a higher frequency. When touch causes signal degradation at the normal frequency, the system switches to the higher frequency operation, effectively changing the operating parameter to avoid the harmful effect of user touch while maintaining exposed antenna design for optimal performance.
3Reliability
If a dielectric cover is added to prevent user touch, then the signal degradation is prevented, but the appearance quality and antenna performance are compromised
Solution Approach 1:
The invention extracts the protective function from the dielectric cover and transfers it to the dual-radiator switching mechanism. Instead of using a physical dielectric cover that would compromise appearance and antenna performance, the system extracts the signal protection function and implements it through frequency-based switching between two radiators, thereby maintaining both appearance quality and antenna performance while preventing signal degradation from touch.
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 dual-radiator system maintains antenna performance by shifting the second radiator's frequency to the first radiator's band upon touch, preventing signal degradation and enhancing user experience.
Implementation Method 1
the first radiator and the second radiator generate resonances in different frequency bands
Data Source
AI summary
A mobile terminal, where the mobile terminal includes an antenna, where the antenna includes a first radiator, a second radiator that forms an electrical connection with the first radiator, a first ground branch that forms a coupling part with one end of the first radiator, and a second ground branch that forms another coupling part with the other end of the first radiator, where the first radiator, the first ground branch, and the second ground branch form an outer frame of the mobile terminal, the second radiator encircles in an inner side of the outer frame formed by the first radiator, the first ground branch, and the second ground branch, and the first radiator and the second radiator generate resonances in different frequency bands.