Vehicle Window Slot Antenna Tuning With Conductive Coating Deletions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle window antennas face challenges in designing a tunable frequency band antenna that meets performance requirements while maintaining aesthetic and heat reduction benefits, particularly on windshields, where limited space and difficulty in frequency tuning hinder effective radio frequency wave transmission and reception across various frequency bands.
Innovation Solution
A slot antenna is formed between the vehicle window frame and a conductive transparent film panel, with adjustable slot length and introduction of slits to shift resonant frequencies, and capacitive coupling for easier tuning and manufacturing, allowing for multiple mode excitation to cover a wide frequency range from 45 MHz to 860 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a slot antenna is formed between the window frame and conductive coating edge, then aesthetic appearance and heat reduction benefits are maintained, but frequency tuning capability and performance across different frequency bands are limited
Solution Approach 1:
The slot antenna is divided into multiple segments with adjustable lengths. By selectively extending or shortening individual slot segments, the antenna can be tuned to different frequency bands while maintaining the overall slot antenna structure and its aesthetic/thermal benefits.
Solution Approach 2:
The slot antenna incorporates adjustable or reconfigurable elements that allow dynamic modification of the antenna's electrical characteristics. This enables the same physical structure to operate across multiple frequency bands by changing the effective electrical length or configuration of the slots.
2Length of moving object
If the slot length is maximized to cover lower frequency bands, then TV band reception is improved, but the antenna becomes difficult to tune for higher frequency bands like FM
Solution Approach 1:
The slot antenna is divided into multiple segments with adjustable lengths. By selectively extending or shortening individual slot segments, the antenna can be tuned to different frequency bands while maintaining the overall slot antenna structure and its aesthetic/thermal benefits.
Solution Approach 2:
The antenna design allows for changing the electrical parameters (length, width, configuration) of the slot segments to optimize performance for different frequency bands. This enables the same physical structure to adapt to various frequency requirements.
3Ease of manufacture
If the conductive coating is removed or modified to create the slot, then antenna functionality is achieved, but heat reduction performance and manufacturing complexity are affected
Solution Approach 1:
Instead of removing the conductive coating from the entire window surface, the coating is modified only in specific localized areas to create the slot antenna structure. This minimizes the impact on overall heat reduction performance while achieving antenna functionality.
Solution Approach 2:
The slot antenna structure is created as a pattern or template within the existing conductive coating layer, allowing the antenna geometry to be defined without completely removing or replacing the thermal control coating.
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 solution enables a vehicle window antenna system that provides improved frequency tuning, reduced manufacturing complexity, and enhanced radio frequency energy transfer across multiple bands, including TV, FM, and other electronic device frequencies, while maintaining aesthetic and heat reduction benefits.
Implementation Method 1
capacitive coupling for easier tuning and manufacturing, allowing for multiple mode excitation to cover a wide frequency range from 45 MHz to 860 MHz
Implementation Method 2
The slot length is chosen such as to support fundamental modes, at frequency bands of interest. The annular slot formed between the vehicle frame and the conductive coating edges is the longest slot size and thus defines the fundamental mode with the lowest resonant frequency
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A vehicle window assembly. The window assembly includes a glass ply and an electro-conductive coating located on a surface of the glass ply. The electro-conductive coating has an outer peripheral edge that is adapted to be spaced from an inner metal edge of a vehicle frame so as to define an antenna slot. The electro-conductive coating includes at least one deleted portion adjacent the outer peripheral edge, wherein the deleted portion is sized to tune the antenna slot to a desired resonant frequency.