Transparent Vehicle Window Antenna for Wideband Radiation Efficiency
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Solution Overview
Problem
Vehicle antennas face efficiency issues due to metallic vehicle bodies blocking radio waves, and transparent antennas on glass suffer from electrical losses and impaired radiation efficiency, making it difficult to operate as wideband antennas.
Innovation Solution
A transparent antenna system using a dielectric substrate with patch antennas and slots of various shapes, configured as Coplanar Waveguide (CPW) feeding structures, to enhance radiation efficiency and support LTE and 5G communication services across multiple bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transparent antenna is disposed on glass to maintain exterior design, then antenna visibility is reduced, but antenna radiation efficiency and impedance bandwidth characteristics are deteriorated due to electrical loss
Solution Approach 1:
The patent embeds a ground layer within a transparent substrate, creating a nested structure where the ground pattern is integrated inside the transparent material. This nesting approach allows the antenna and ground to coexist on the same layer while maintaining transparency, reducing electrical loss compared to conventional single-layer transparent antennas.
Solution Approach 2:
The patent transitions from conventional planar antenna structures to a multi-dimensional configuration by stacking multiple transparent layers with different conductive patterns. This dimensional change enables wideband operation while maintaining transparency, as each layer contributes to different frequency bands and the stacked structure reduces overall electrical loss.
2Adaptability or versatility
If antenna pattern and ground pattern are disposed on different planes to achieve wideband operation, then bandwidth is increased, but structural complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the antenna pattern and ground pattern onto the same transparent layer by using complementary conductive trace configurations. The antenna elements and ground elements are integrated in a planar arrangement within the same substrate layer, simplifying manufacturing while achieving wideband characteristics through proper trace geometry and distribution.
Solution Approach 2:
The patent segments the transparent substrate into multiple functional layers, each containing specific conductive patterns optimized for different frequency bands. This segmentation allows independent optimization of each layer's antenna and ground patterns, achieving wideband operation through coordinated operation of multiple segments rather than requiring complex three-dimensional structures.
3Strength
If metallic vehicle body is used for vehicle construction, then structural strength is improved, but radio wave transmission is blocked reducing antenna efficiency
Solution Approach 1:
The patent applies local quality changes by creating transparent conductive regions at specific antenna locations on the vehicle body. Instead of making the entire vehicle body transparent or non-metallic, only localized areas containing the antenna patterns and ground layers are made transparent, allowing radio wave transmission at these specific points while maintaining metallic construction elsewhere for structural strength.
Solution Approach 2:
The patent introduces transparent conductive layers as intermediary elements between the metallic vehicle body and the external environment. These intermediary layers serve as both structural components and radio wave transmission pathways, allowing the metallic body to maintain its strength while the transparent intermediary layers enable radio wave penetration for antenna operation.
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 improves antenna efficiency and transparency, enabling wideband operation and placement on vehicle windows, enhancing communication performance by maintaining radiation efficiency and supporting multiple communication bands.
Implementation Method 1
a first patch having a first slot formed at an inner region of a first conductive pattern disposed on the dielectric substrate and configured to radiate a signal in a first band through the first conductive pattern
Data Source
AI summary
An antenna assembly according to an implementation may include a dielectric substrate, a first patch having a first slot formed at an inner region of a first conductive pattern disposed on the dielectric substrate and configured to radiate a signal in a first band through the first conductive pattern, and a second patch having a second slot formed at an inner region of a second conductive pattern disposed at an inner region of the first slot and configured to radiate a signal in a second band and a third band through the second conductive pattern.