Adjustable Ground Antenna for Vehicle Reception
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Solution Overview
Problem
Conventional film antennas for vehicles are difficult to attach, require expert installation, and have low gain due to poor conductivity and long cable lengths, necessitating amplifiers that increase power consumption and require dedicated connectors.
Innovation Solution
An antenna device with an adjustable ground element and antenna element connected via a high-frequency transmission line, allowing capacitive coupling with the vehicle body, improving reception characteristics and simplifying attachment by eliminating the need for external antennas and amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a film antenna is used to achieve diversity reception, then reception stability improves, but attachment difficulty and installation cost increase
Solution Approach 1:
The patent combines the antenna element and ground element into a single integrated antenna device that can be attached as one unit to the vehicle dashboard or console. This merging eliminates the need for separate film antenna attachments on multiple surfaces, reducing installation complexity while maintaining diversity reception capability through the adjustable ground element.
Solution Approach 2:
The antenna device is designed to be easily attached by the user themselves without requiring expert installation. The simplified single-unit attachment mechanism enables self-service installation, eliminating the need to pay for professional attachment services while still achieving reliable reception through the integrated design.
2Reliability
If a film antenna with long cable is used, then diversity reception is enabled, but antenna gain decreases
Solution Approach 1:
The ground element is designed with adjustable positioning capability, allowing it to be dynamically positioned at optimal locations within the vehicle interior. This adjustability enables the antenna to achieve better reception performance and higher gain by optimizing the electrical connection to the vehicle body, while still maintaining diversity reception functionality.
3Reliability
If an amplifier is added to improve film antenna performance, then reception quality improves, but power consumption and device complexity increase
Solution Approach 1:
The antenna device utilizes the vehicle body itself as the ground reference, eliminating the need for external amplifiers or active components. The vehicle's metal structure serves as the natural ground plane, allowing the antenna to achieve good reception quality through passive electromagnetic coupling alone, thereby reducing device complexity and power consumption.
4Reliability
If an amplifier is added to improve film antenna performance, then reception quality improves, but power consumption increases
Solution Approach 1:
The antenna device utilizes the vehicle body itself as the ground reference, eliminating the need for external amplifiers or active components. The vehicle's metal structure serves as the natural ground plane, allowing the antenna to achieve good reception quality through passive electromagnetic coupling alone, thereby reducing device complexity and power consumption.
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 antenna device achieves improved reception performance and ease of attachment, reducing manufacturing costs and power consumption while maintaining or exceeding the reception quality of conventional film antennas.
Implementation Method 1
capacitive coupling occurs between the ground element and a metal portion of the vehicle body mounting an onboard antenna
Data Source
AI summary
Provided is an antenna device including an antenna element configured to receive a broadcast wave and a signal that is superimposed on the broadcast wave and then is transmitted, a ground element having a predetermined length, the ground element being configured to be capable of adjusting a relative position with respect to the antenna element, and a feeding part to which the antenna element and the ground element are connected and from which the signal received by the antenna element is taken out.