Retroreflective Antenna Structure for Smartphone Surface Wave Suppression
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Solution Overview
Problem
Conventional solutions for surface wave suppression in smartphones with antennas beneath the glass layer are not compact and compatible with all-display designs, leading to disturbed radiation patterns and reduced antenna gain, especially at high frequencies.
Innovation Solution
A communication device with a retroreflective structure integrated inside a dielectric layer adjacent to the antenna element, configured to reflect radio waves in a non-parallel angle, preventing parasitic channeling into surface waves and enhancing radiation patterns and gain by directing energy into desired directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface wave suppression solutions are used, then antenna performance may be improved, but the device size and complexity increase, making them incompatible with compact all-display smartphone designs
Solution Approach 1:
The patent employs a thin retroreflective film structure integrated into the existing dielectric layer between the chassis and glass layer. This thin-film approach provides surface wave suppression functionality without requiring bulky conventional suppression structures, thereby maintaining compact device dimensions and simplicity while improving antenna performance.
2Shape
If antennas are placed beneath the glass layer in all-display designs, then device aesthetics and compactness are improved, but radiation patterns become disturbed and antenna gain is reduced
Solution Approach 1:
The retroreflective structure acts as an intermediary element between the antenna and the glass layer. It intercepts surface waves that would otherwise propagate along the glass-chassis interface and redirects them back toward the antenna, thereby correcting the disturbed radiation pattern caused by the antenna's placement beneath the glass layer while maintaining the aesthetic all-display design.
3Productivity
If high frequencies above 20 GHz are used for media transmission, then data rates are improved, but parasitic channeling into surface waves increases, reducing antenna gain
Solution Approach 1:
The retroreflective structure converts the harmful parasitic surface waves, which cause energy loss and reduced antenna gain at high frequencies, into beneficial reflected waves that return to the antenna. By transforming these parasitic channeling effects into constructive reflections, the system recovers energy that would otherwise be lost, thereby maintaining antenna gain and enabling effective high-frequency operation for high-speed data transmission.
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 retroreflective structure improves antenna efficiency by minimizing parasitic channeling and surface wave propagation, maintaining a compact design that does not compromise other device components, and achieving improved radiation patterns and gain, especially at high frequencies.
Implementation Method 1
a retroreflective structure extending inside the dielectric layer and being located adjacent to the antenna element, wherein the retroreflective structure is configured to reflect the radio wave in an angle non-parallel to the plane
Implementation Method 2
the retroreflective structure is configured to reflect the radio wave in an angle non-parallel to the plane
Implementation Method 3
a dielectric layer extending along a plane between the chassis and the glass layer
Data Source
AI summary
The disclosure relates to suppressing surface waves in a communication device for a wireless communication system. The communication device includes a dielectric layer extending along a plane between a chassis and a glass layer, an antenna element configured to emit a radio wave, and a retroreflective structure extending inside the dielectric layer and being located adjacent to the antenna element, and where the retroreflective structure is configured to reflect the radio wave in an angle non-parallel to the plane. The retroreflective structure hence prevents parasitic channeling of the antenna energy into surface waves in and behind the glass layer and directs the radiation into the desired direction.