Capacitance Loading Element Segmentation for Antenna Gain
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Solution Overview
Problem
Existing vehicle-mounted antennas face challenges in optimizing antenna size and performance due to mutual interference and capacitance loading effects, particularly in the AM/FM band, leading to reduced gain and increased size.
Innovation Solution
The antenna device incorporates a capacitance loading element with a turning-around area on its front and rear sides, allowing the first antenna to be positioned in front of or behind the turning-around area, and dividing the capacitance loading element into left and right plate-like portions to reduce floating capacity and enhance performance by adjusting the current and voltage paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a capacitance loading element is added to the antenna device, then the antenna size can be reduced, but it causes mutual interference and reduces gain in the AM/FM band
Solution Approach 1:
The capacitance loading element is divided into a left plate-like portion and a right plate-like portion that are separate from each other. This segmentation reduces the floating capacity between the capacitance loading element and the AM/FM antenna, thereby reducing mutual interference and improving antenna gain while maintaining the space-saving benefit of the capacitance loading element.
2Volume of moving object
If the capacitance loading element is positioned close to the first antenna, then the overall device size is reduced, but it increases the influence of capacitance loading on the first antenna
Solution Approach 1:
By dividing the capacitance loading element into separate left and right plate-like portions, the patent reduces the overall floating capacity effect on the first antenna even when positioned in close proximity, thus mitigating the harmful capacitance loading influence while maintaining compact device dimensions.
Solution Approach 2:
The oblique inclination of the front edge portions of the left and right plate-like portions creates localized geometric features that reduce floating capacity in specific areas, allowing the capacitance loading element to be positioned close to the first antenna without excessive capacitance loading influence.
3Ease of manufacture
If the capacitance loading element has a simple structure, then manufacturing is easier, but it cannot effectively suppress floating capacity and reduce interference
Solution Approach 1:
The capacitance loading element is segmented into left and right plate-like portions with specific geometric features (oblique front edges), which can still be manufactured relatively simply while effectively reducing floating capacity and interference through the segmented configuration.
Solution Approach 2:
The front edge portions of the left and right plate-like portions are obliquely inclined, creating an asymmetric geometry that effectively reduces floating capacity. This asymmetric feature can be integrated into the manufacturing process without significantly increasing complexity while providing improved interference suppression.
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 configuration enhances the average gain of the FM waveband, reduces the influence of capacitance loading on the ITS antenna, suppresses floating capacity, and improves the overall performance of the AM/FM band by optimizing the electric length and reducing interference.
Implementation Method 1
a capacitance loading element (3)
Data Source
AI summary
An antenna device includes a case, a first antenna and a second antenna including a capacitance loading element. The capacitance loading element includes a turning-around area turning around in a front-rear direction on at least one of a front side and a rear side thereof. When the turning-around area is provided on the front side, at least part of the first antenna is situated in front of the turning-around area. When the turning-around area is provided on the rear side, at least part of the first antenna is situated behind the turning-around area. When the turning-around area is provided on the front side and on the rear side, at least part of the first antenna is situated at least one of in front of the turning-around area on the front side and behind the turning-around area on the rear side.