Transparent Vehicle Glass Antenna With Shared Ground Matching
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Solution Overview
Problem
Vehicle bodies and roofs made of metal materials obstruct radio waves, reducing antenna efficiency, and transparent antennas on glass suffer from electrical loss and impedance bandwidth deterioration, making it difficult to implement wideband antennas with high performance, especially in low bands.
Innovation Solution
A vehicle antenna design with a substrate having a square shape and symmetrical radiating parts, feeding lines, and a stair-shaped ground part for impedance matching, optimized for placement on vehicle glass, allowing multiple antenna elements within a limited space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent antenna is disposed on vehicle glass, then antenna radiation efficiency is improved, but impedance bandwidth characteristics are deteriorated
Solution Approach 1:
The ground layer is divided into multiple ground patterns arranged in different directions. This segmentation allows the antenna to maintain good impedance bandwidth characteristics across multiple frequency bands by providing multiple current paths for different signal frequencies, resolving the contradiction between radiation efficiency and bandwidth performance.
Solution Approach 2:
The antenna structure is designed to simultaneously support multiple frequency bands (low band and wide band) through a single transparent antenna element combined with multi-directional ground patterns. This multi-functional design enables the same antenna structure to serve universal communication requirements across different bands without sacrificing radiation efficiency or bandwidth characteristics.
2Productivity
If multiple antenna elements are disposed for MIMO, then communication capacity is improved, but antenna module size is increased
Solution Approach 1:
Multiple antenna elements are merged into a single transparent antenna structure that can support MIMO operations. By integrating multiple radiating elements within one compact transparent antenna module, the design achieves improved communication capacity through MIMO while minimizing the overall antenna module size and maintaining aesthetic appearance.
3Shape
If antenna is disposed on metal vehicle body, then exterior design is maintained, but antenna efficiency is greatly reduced
Solution Approach 1:
A transparent antenna material serves as an intermediary between the metal vehicle body and the radio waves. This transparent material allows radio waves to pass through effectively while maintaining the metallic exterior design appearance, thus resolving the contradiction between preserving exterior design and ensuring antenna efficiency.
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 design achieves high performance and efficient radiation in both low and wide bands, minimizing antenna size and maintaining improved radiation efficiency and impedance bandwidth.
Implementation Method 1
a radiating part disposed on the substrate and including a first radiating part and a second radiating part for radiating a wireless signal
Implementation Method 2
a ground part disposed on the substrate by being spaced apart from the radiating part and having at least a portion of a boundary area in a stair shape, the ground part comprising a shared ground part disposed along a diagonal from the first corner to the third corner, located between the first radiating part and the second radiating part, and performing impedance matching of the first radiating part and the second radiating part
Data Source
AI summary
According to embodiments, provided is an antenna comprising: a substrate of a square shape including first to fourth corners; a radiation unit disposed on the substrate and including a first radiation unit and a second radiation unit that radiate a wireless signal; a first feed line that applies the wireless signal to the first radiation unit; a second feed line that applies the wireless signal to the second radiation unit and has an extension line that perpendicularly intersects with an extension line of the first feed line; and a ground portion disposed on the substrate and spaced apart from the radiation unit and having at least a portion of a boundary area including a step shape, wherein the ground unit includes a shared ground unit that is disposed diagonally from a first edge to a third edge, is located between the first radiation unit and the second radiation unit, and performs impedance matching of the first radiation unit and the second radiation unit.