Transparent Vehicle Window Antenna Layout for Wideband Efficiency
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Solution Overview
Problem
Vehicle antennas face efficiency issues due to metallic vehicle bodies and roofs, which block radio waves, and transparent antennas on glass suffer from electrical loss and impaired radiation efficiency, making it difficult to operate as wideband antennas.
Innovation Solution
A wideband antenna structure made of transparent material with a dielectric substrate, featuring a radiator region with conductive patterns of different widths in step structures and asymmetric ground regions, allowing for efficient operation on a single plane and reduced size, enabling placement on vehicle windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a transparent antenna is disposed on glass corresponding to a window of the vehicle, then the exterior design of the vehicle is maintained, but antenna radiation efficiency and impedance bandwidth characteristics are deteriorated due to electrical loss of the transparent antenna
Solution Approach 1:
The antenna is divided into separate functional layers: a transparent antenna layer with conductive patterns for radiation and a separate ground layer with ground patterns. This segmentation allows each layer to be optimized independently - the transparent layer maintains aesthetics while the ground layer provides necessary electrical reference, reducing overall electrical loss and improving radiation efficiency
Solution Approach 2:
The antenna system uses composite structure combining transparent conductive materials (such as ITO or metal mesh patterns on glass) with traditional conductive ground layers. This composite approach allows the transparent portion to maintain visual appearance while the combined structure achieves adequate radiation efficiency and bandwidth characteristics
2Adaptability or versatility
If an antenna layer with an antenna pattern and a ground layer with a ground pattern are disposed on different planes, then wideband operation is enabled, but the antenna structure becomes complex and cannot be implemented on a single plane
Solution Approach 1:
The patent transitions from a two-plane three-dimensional structure to a single-plane two-dimensional structure by projecting both antenna and ground patterns onto the same plane. This dimensional reduction simplifies the structure while maintaining wideband operation capability through careful pattern design that creates the necessary electrical separation and coupling on a single surface
3Device complexity
If the antenna pattern and the ground pattern are disposed on the same layer, then the structure is simplified, but it is difficult to operate as a wideband antenna
Solution Approach 1:
Different regions of the single-plane antenna structure are assigned different functions: certain areas contain antenna radiation patterns while other areas contain ground patterns. This local differentiation allows the single-plane structure to emulate the functionality of multi-plane structures, enabling wideband operation through spatially distributed pattern design
Data Source
AI summary
An antenna assembly comprises: a dielectric substrate; a first ground region disposed on one side of a feed line disposed on the dielectric substrate; a radiator region in which a first side and a second side corresponding to the opposite side of the first side form end portions of conductive patterns such that the conductive patterns having different widths are formed in a plurality of step structures; and a second ground region disposed on the other side of the feed line, wherein the first ground region may be formed to have a length greater than or equal to that of the second ground region in one axial direction. The number of steps on the second side may be greater than or equal to the number of steps on the first side.