Transparent Mesh GNSS Antenna for Dual-Band Vehicle Placement
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Solution Overview
Problem
High-precision GNSS positioning requires dual-frequency band operation, but existing GNSS antennas are too large for optimal placement on vehicles, and optically transparent conductors like ITO have low conductivity, leading to performance degradation and aesthetic issues.
Innovation Solution
A dual-band circularly polarized GNSS antenna with a mesh structure on an optically transparent substrate, featuring a radiating element and ground plane with mesh patterns, thinned feed lines, and stubs for impedance matching, allowing for placement on vehicle roofs or windows without visual obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a GNSS antenna operates at two frequency bands for high-precision positioning, then positioning accuracy is improved, but the antenna size becomes significantly larger
Solution Approach 1:
The patent uses a thin transparent substrate as the antenna base, replacing traditional bulky antenna structures with a thin-film mesh design that maintains dual-frequency operation while significantly reducing size and enabling integration into vehicle surfaces
Solution Approach 2:
The patent changes the operating parameters by designing the mesh structure with specific geometric parameters (mesh size, conductor width, spacing) that enable dual-frequency resonance at L1 and L5 bands while maintaining a compact form factor suitable for vehicle integration
2Illumination intensity
If optically transparent conductors like ITO are used in the antenna, then visual appearance is improved, but conductivity decreases leading to performance degradation
Solution Approach 1:
The patent employs a composite structure combining transparent substrate with conductive mesh patterns, achieving a balance between optical transparency and electrical conductivity by using the mesh geometry rather than continuous thin-film conductors
Solution Approach 2:
The mesh structure inherently creates a porous/conductive pattern that allows light transmission through the gaps while maintaining sufficient electrical conductivity for antenna operation, resolving the trade-off between transparency and conductivity
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 antenna achieves high efficiency, optical transparency, and accurate positioning by ensuring good impedance matching and axial ratio, enabling placement at optimal vehicle locations without compromising visual appearance.
Implementation Method 1
a radiating element having a first mesh structure and disposed on the first surface of the substrate layer; a ground plane having a second mesh structure formed on the second surface of the substrate layer
Implementation Method 2
an adhesive layer formed on the second surface of the conductive mesh structure
Data Source
AI summary
An antenna includes an optically transparent substrate layer having a first surface and an opposing second surface; a radiating element having a first mesh structure and disposed on the first surface of the substrate layer; a ground plane having a second mesh structure formed on the second surface of the substrate layer; at least two feed lines configured to connect the radiating element to an external circuit; and at least two stubs connected to the radiating element.