Antenna Unit With Spatial Matching Elements For Metal Housing
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Solution Overview
Problem
Existing antenna technologies for mobile communication devices with metal cases face challenges in efficiently propagating 5G signals due to electromagnetic radiation distortion and inability to scan space effectively, as seen in solutions like US8760352 B2 and US7595765 B1, which are not suitable for metal housings and lack directional scanning capabilities.
Innovation Solution
An antenna unit comprising a dielectric substrate, a dielectric cover, and an antenna array configured to form traveling waves, with spatial matching elements to reduce reflections and direct radiation in the end-fire direction, enabling efficient signal propagation through a metal housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna array is used in a mobile device with a metal case, then the device structure is simple, but electromagnetic radiation is distorted by the metal case and space scanning capability is lost
Solution Approach 1:
The patent introduces a dielectric substrate and dielectric cover as intermediary elements between the antenna array and the metal case. These dielectric layers act as mediators that guide electromagnetic waves from the antenna elements through the metal housing without direct metal-to-air transition, thereby preventing distortion while maintaining structural integration. The dielectric substrate supports the antenna array and provides a controlled impedance environment, while the dielectric cover enables waves to pass through the metal case effectively.
Solution Approach 2:
The antenna unit is nested within the metal housing structure, with the antenna array embedded in the dielectric substrate which is itself integrated into the device chassis. The dielectric cover is positioned between the antenna array and the metal case, creating a nested configuration where each layer serves a specific function while maintaining compact integration. This nesting approach allows the antenna system to be embedded without requiring separate external antenna structures.
2Adaptability or versatility
If a traveling wave antenna array with spatial matching elements is implemented, then space scanning capability and antenna gain are improved, but the device complexity increases
Solution Approach 1:
The patent applies spatial matching elements with specific dielectric properties at particular locations within the antenna unit to optimize wave propagation in different directions. The dielectric substrate and cover have carefully selected permittivity values that create appropriate phase velocities for traveling waves, enabling directional scanning. Each layer's dielectric constant is locally optimized to achieve the desired radiation pattern and scanning performance without requiring complex active control mechanisms.
Solution Approach 2:
The antenna system achieves dynamic space scanning capability through the traveling wave mechanism, where the phase progression across the antenna array elements creates a moving beam pattern. By controlling the phase and amplitude distribution across the array, the main radiation lobe can be steered to different angles without physically moving the antenna structure. This dynamic beam steering is enabled by the traveling wave propagation through the dielectric layers.
3Loss of energy
If dielectric substrate and dielectric cover are used to guide traveling waves, then radiation losses are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the dielectric constant and thickness parameters of the substrate and cover layers to achieve minimum radiation loss. By carefully selecting the permittivity values and layer thicknesses, the system creates appropriate impedance matching and phase control for the traveling waves. These parameter optimizations reduce energy loss while maintaining compatibility with standard manufacturing processes for printed circuit boards and dielectric laminates.
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 proposed antenna unit effectively directs traveling waves in the end-fire direction, enhancing scanning capabilities and antenna gain, particularly in the +/- 50-degree range, while minimizing reflections and radiation losses, thus addressing the limitations of previous technologies.
Implementation Method 1
an antenna array including antenna elements arranged in the dielectric substrate, and configured to form traveling waves propagating in the dielectric substrate and the dielectric cover
Implementation Method 2
the spatial matching element may be spatially matched with the antenna array with the dielectric cover and may reduce reflections of traveling waves propagating from the antenna array to the dielectric cover
Data Source
Figure 1~2B
Figure 3~4
Figure 5~6
AI summary
An antenna unit includes a dielectric substrate; a dielectric cover on the dielectric substrate; and an antenna array. The antenna array includes antenna elements arranged in the dielectric substrate and configured to form traveling waves propagating in the dielectric substrate and the dielectric cover. The antenna unit also includes at least one spatial matching element arranged in space formed inside the dielectric substrate, spatially matched with the dielectric cover, and coupled with the at least one antenna element. The spatial matching element is configured to be spatially matched with the antenna array with the dielectric cover and to reduce reflections of traveling waves propagating from the antenna array to the dielectric cover. The antenna device may be diversified.