Rear Window Glass Antenna Layout for Multi-Band Reception
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Solution Overview
Problem
The limited space on vehicle rear glass for antennas, combined with the need for separate antennas for different broadcasting media, makes it challenging to efficiently mount multiple types of antennas.
Innovation Solution
A vehicle window glass design that incorporates a defogger and multiple antennas, including FM/AM dual band, digital television, and DAB antennas, utilizing a specific configuration of power supply elements and adjustment elements to optimize antenna placement and sensitivity, allowing for efficient mounting of multiple types of antennas on the glass surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate antennas are provided for each broadcasting medium (FM, AM, digital television, DAB), then each antenna can be optimized for its specific function, but the space required on the vehicle window glass increases significantly
Solution Approach 1:
The patent implements a multi-functional antenna system where a single antenna structure serves multiple broadcasting functions. The antenna is designed with multiple elements (first and second antenna elements) that can receive different types of broadcasts (FM, AM, digital television, DAB) by adjusting the electrical connection configurations. This allows one antenna structure to replace what would traditionally require multiple separate antennas, thereby reducing the space required on the vehicle window glass while maintaining optimized reception performance for each broadcasting medium.
2Adaptability or versatility
If multiple antennas are mounted on the limited space of vehicle rear glass, then various broadcasting functions can be achieved, but the arrangement becomes complex and space efficiency decreases
Solution Approach 1:
The patent divides the antenna system into distinct functional elements (first antenna element and second antenna element) that can be independently configured. Each element can be selectively connected to different terminals depending on the desired broadcasting function. This segmentation allows the system to achieve multiple broadcasting functions (FM, AM, digital television, DAB) through different connection configurations rather than requiring physically separate antennas for each function, thereby reducing arrangement complexity while maintaining versatility.
Solution Approach 2:
The antenna system incorporates dynamic reconfigurability through switching mechanisms that can change the electrical connection states of the antenna elements. By dynamically adjusting which elements are connected and how they are connected (e.g., parallel or series configurations), the system can adapt to different broadcasting requirements without physical reconfiguration. This dynamic capability enables a single antenna structure to provide multiple functions with reduced spatial requirements compared to fixed separate antenna arrangements.
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
This design enables effective capacitive coupling and efficient use of space, improving the receiver sensitivity and directivity of FM and AM broadcast waves, while also accommodating digital television and DAB antennas, enhancing overall broadcasting performance.
Implementation Method 1
effective use of space, improving the receiver sensitivity and directivity of FM and AM broadcast waves
Data Source
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AI summary
A vehicle window glass according to the present invention includes a glass plate having a defogger region and an antenna region, a defogger disposed in the defogger region and having a plurality of horizontal heating wires, and an antenna including at least an FM antenna and disposed in the antenna region, the FM antenna including a first power supply part disposed on the glass plate, and an FM antenna body having a first horizontal part, a second horizontal part closer to the defogger than is the first horizontal part and at least one vertical part linking both the horizontal parts, and connected to the first power supply part.