Back Door Antenna Gain via Auxiliary Element
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Solution Overview
Problem
Vehicles with resinous back doors and metallic reinforcing frames often fail to achieve sufficient antenna gain due to variations in the shape and size of the reinforcing structures, affecting the reception of FM radio broadcast waves.
Innovation Solution
Incorporating a defogger with bus bars and heating wires, an auxiliary element connected to the defogger, and an antenna surrounded by the defogger and auxiliary element, which achieves capacitive coupling with the metallic reinforce to enhance antenna gain, allowing for improved radio wave reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallic reinforcing frame is disposed in the back door to heighten rigidity, then the structural strength is improved, but the antenna gain is insufficient due to variations in the shape and size of the reinforce
Solution Approach 1:
An auxiliary element is introduced as an intermediary between the antenna and the metallic reinforcing frame. This auxiliary element achieves capacitive coupling with the reinforce, mediating the interaction to improve antenna gain while preserving the structural integrity provided by the reinforcing frame.
Solution Approach 2:
The invention changes the electrical parameters of the antenna system by introducing the auxiliary element that modifies the capacitive coupling characteristics. This allows tuning and optimization of antenna performance despite variations in the physical dimensions and shape of the reinforcing frame.
2Reliability
If the antenna is tuned to compensate for reinforce variations, then antenna gain may be improved, but sufficient gain cannot be achieved depending on the shape of the reinforce
Solution Approach 1:
The auxiliary element is designed to work universally with different shapes and sizes of metallic reinforcing frames. By achieving capacitive coupling with the reinforce regardless of its specific geometry, the auxiliary element enables consistent antenna performance across various back door configurations.
Solution Approach 2:
The auxiliary element serves as a universal intermediary that adapts to different reinforce geometries through capacitive coupling, making the antenna system compatible with various reinforce shapes without requiring extensive retuning.
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 configuration results in a back door and rear window glass system with a relatively high antenna gain, effectively shifting frequency dips outside the desired frequency band and improving average antenna performance in the FM broadcast frequency range.
Implementation Method 1
an auxiliary element which has branched off from the defogger is caused to achieve capacitive coupling with a metallic reinforcing frame grounded to the metallic body, thereby enabling the antenna to receive FM radio broadcast waves with high gain
Implementation Method 2
a defogger including a first bus bar that extends in an upper-lower direction, a second bus bar that is disposed apart from the first bus bar in a horizontal direction and extends in the upper-lower direction, and a plurality of heating wires that connect the first bus bar to the second bus bar
Data Source
AI summary
A back door including an opening, includes: a resinous outer panel; a resinous inner panel; a metallic reinforce disposed between the outer panel and the inner panel; and a rear window glass covering the opening. The rear window glass includes: a defogger including a first bus bar that extends in an upper-lower direction, a second bus bar that is disposed apart from the first bus bar in a horizontal direction and extends in the upper-lower direction, and a plurality of heating wires that connect the first bus bar to the second bus bar; an auxiliary element connected to the defogger; and an antenna disposed so as to be surrounded by the defogger and the auxiliary element.