Transparent Dual-Band GNSS Antenna With Mesh Impedance Matching
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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 an optically transparent substrate, a mesh structured radiating element, and ground plane, featuring partially thinned feed lines and stubs for impedance matching, allowing for placement on vehicle roofs or windows without compromising visual appearance.
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 antenna is divided into multiple independent radiating elements, each designed to operate at specific frequency bands. This segmentation allows the antenna to achieve dual-band operation without requiring a single large structure, as each element can be optimized for its specific frequency range while maintaining a compact overall footprint.
Solution Approach 2:
The patent transitions from traditional planar antenna designs to a three-dimensional configuration by positioning radiating elements at different heights and orientations above the ground plane. This vertical dimensionality allows dual-frequency operation with reduced horizontal area, enabling high-precision positioning without significantly increasing antenna size.
2Illumination intensity
If an optically transparent conductor like ITO is used for the antenna, then visual appearance is improved, but conductivity is reduced leading to performance degradation
Solution Approach 1:
The antenna employs a composite structure combining optically transparent conductive materials with carefully designed geometric patterns. The transparent conductor is used in conjunction with a ground plane and specific radiating element configurations that compensate for the lower conductivity, achieving both optical transparency and acceptable antenna performance through the synergistic combination of materials and结构设计.
Solution Approach 2:
The patent applies different material properties to different parts of the antenna structure. Optically transparent conductors are used specifically for the radiating elements where optical transparency is most critical, while other portions of the antenna system use materials optimized for electrical performance. This localized application of different material qualities balances optical and electrical requirements.
3Reliability
If the GNSS antenna is placed at the topmost part of the vehicle for optimal performance, then positioning reliability is improved, but visual appearance is compromised
Solution Approach 1:
The antenna utilizes optically transparent or translucent materials that allow light to pass through, making the antenna structure invisible or minimally visible when viewed from outside the vehicle. This optical property enables the antenna to be placed at the topmost part of the vehicle for optimal positioning reliability while maintaining aesthetic appearance, as the transparent material blends with the vehicle's glass surfaces.
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.