Transparent Vehicle Window Antenna Module for Wideband MIMO
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Solution Overview
Problem
Vehicle antennas face efficiency issues due to metallic vehicle bodies, and transparent antennas struggle with radiation efficiency and impedance bandwidth when integrated into vehicle windows, particularly in providing wideband LTE and 5G communication services while maintaining a compact size and minimizing interference.
Innovation Solution
A wideband antenna structure made of transparent material with conductive patterns on a dielectric substrate, featuring a shared ground structure and CPW feeding, allowing for efficient radiation and reduced size, optimized for various positions on vehicle windows and enabling MIMO operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transparent antenna is disposed on vehicle glass to maintain exterior design, then antenna visibility is reduced, but antenna radiation efficiency and impedance bandwidth characteristics deteriorate due to electrical loss of the transparent antenna
Solution Approach 1:
The patent uses a composite structure combining transparent material substrate with metallic pattern layers. The antenna includes a first metallic pattern layer and a second metallic pattern layer formed on opposite surfaces of a transparent material, creating a sandwich structure that maintains transparency while improving radiation efficiency through the synergistic effect of multiple conductive layers
Solution Approach 2:
The patent optimizes the thickness of the transparent material substrate and the spacing between metallic pattern layers to achieve wideband impedance matching. By carefully controlling these geometric parameters, the antenna achieves broad impedance bandwidth (VSWR < 2) across multiple frequency bands while maintaining transparency and radiation efficiency
2Adaptability or versatility
If the antenna pattern and ground pattern are disposed on different planes to operate as a wideband antenna, then impedance bandwidth increases, but the antenna structure becomes complex and cannot be disposed on a single layer
Solution Approach 1:
The patent transitions from a planar two-dimensional antenna structure to a three-dimensional sandwich structure by forming metallic patterns on both surfaces of a transparent substrate. This dimensional change allows the antenna and ground patterns to be separated in the thickness direction while maintaining a compact single-component structure, achieving wideband operation without excessive complexity
Solution Approach 2:
The patent embeds the transparent material substrate between two metallic pattern layers, creating a nested sandwich structure. The substrate is positioned within the space between the first and second metallic patterns, forming an integrated compact structure that achieves wideband characteristics while maintaining structural simplicity
3Productivity
If multiple antenna elements are arranged to provide MIMO functionality, then communication capacity increases, but the antenna module size increases and cannot be placed within limited window region
Solution Approach 1:
The patent combines multiple antenna elements into a single integrated transparent antenna module. By forming multiple metallic patterns on the same transparent substrate, the patent achieves MIMO functionality while maintaining a compact footprint that fits within limited vehicle window regions, merging what would traditionally be separate antenna components into one unified structure
Solution Approach 2:
The patent designs the transparent antenna to perform multiple functions simultaneously: it provides both single-antenna and MIMO operation capabilities, achieves wideband impedance matching across multiple frequency bands, and maintains aesthetic transparency. This multi-functionality allows a single antenna module to replace what would traditionally require multiple separate antenna systems
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 solution enhances antenna efficiency and transparency, allowing for improved communication performance across multiple bands, including low bands, while minimizing size and interference, thus addressing the challenges of integrating antennas into vehicle windows effectively.
Implementation Method 1
an antenna region (1010a) including conductive patterns on one side surface of a dielectric substrate to radiate radio signals
Data Source
AI summary
An antenna assembly may include an antenna region having conductive patterns on one side surface of a dielectric substrate to radiate radio signals. The antenna region may include a first antenna structure and a second antenna structure. The antenna assembly may further include a ground region formed on a same plane as the antenna region. The ground region may include a first slot region and a second slot region. A first feeding line may be disposed at the first slot region, and a second feeding may be disposed at the second slot region. The antenna region may comprise a first conductive pattern, a second conductive pattern, a third conductive pattern, a fourth conductive pattern and a fifth conductive pattern.