Vehicle Glass Antenna Phase Difference via Extended Conductors
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Solution Overview
Problem
Glass antennas for vehicles face challenges in achieving a large phase difference between antenna conductors due to restricted feeding portion placement, which limits the spatial diversity effect and antenna gain, especially when feeding portions are close to each other.
Innovation Solution
The design includes specific configurations for the first and second antenna conductors with elongated elements and connection elements that approach the defogger, allowing for increased phase difference even when feeding portions are close, thereby enhancing antenna gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If feeding portions are placed close to each other due to restricted placement positions, then the antenna conductors can be disposed on the window glass, but the phase difference between received waves decreases and spatial diversity effect is limited
Solution Approach 1:
The patent transitions from considering only the two-dimensional placement distance between feeding portions to incorporating the third dimension of antenna conductor length. By making the antenna conductors extend beyond the window glass boundaries, the patent creates a larger effective phase difference through the combination of placement distance and conductor length, thereby achieving spatial diversity effect even when feeding portions are placed close to each other.
2Reliability
If feeding portions are separated to increase phase difference, then spatial diversity effect is improved, but the placement positions become more restricted
Solution Approach 1:
The patent divides the antenna conductor into two independent components: the portion disposed on the window glass and the portion extending beyond the glass boundaries. This segmentation allows the feeding portions to be placed close to each other on the glass for ease of installation, while the extended portions beyond the glass provide the necessary phase difference and spatial diversity effect.
3Reliability
If antenna conductors are extended beyond window glass boundaries, then phase difference and antenna gain are increased, but the antenna structure becomes more complex
Solution Approach 1:
The patent makes the window glass serve multiple functions: as the substrate for mounting the antenna conductors and as part of the antenna structure itself. The glass boundaries naturally define where the antenna conductors transition from being mounted on the glass to extending beyond it, eliminating the need for additional structural components to support the extended portions.
Data Source
Figure 1
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Figure 4~5
AI summary
A glass antenna for a vehicle includes a first to fourth elements, a connection element and a first and second feeding portions. The first element is elongated from the first feeding portion in a first direction. The second element is elongated from the first element in a second direction. The third element includes: a first partial element which is elongated from the first element in a third direction; a second partial element which is elongated from the first partial element in a fourth direction; and a third partial element which is elongated from the second partial element. The fourth element is elongated from the second feeding portion in the second direction, and detours the second element in the second direction, on a side of the second direction to be elongated in the third direction. The connection element connects the fourth element to a defogger.