Vehicle Window Antenna Device Broadening Frequency Range
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Solution Overview
Problem
Conventional UWB antennas with fan-shaped radiating elements are limited in their ability to broaden the receivable frequency range, primarily due to the length of the outer edge of the radiating element.
Innovation Solution
The antenna device comprises multiple conductor plates with specific configurations, including a first conductor plate with a feeding portion, a second conductor plate with a widening plate surface, and a third conductor plate for capacitive coupling, allowing the antenna to operate in multiple modes and resonate at different frequencies, thereby expanding the frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fan-shaped radiating element is arranged to stand vertically on a ground plane, then the antenna can receive signals over a wide frequency band, but the receivable frequency range is limited by the length of the outer edge of the radiating element and cannot be further broadened
Solution Approach 1:
The antenna device is divided into multiple independent conductor plates (first, second, and third conductor plates), each serving specific functions. The second conductor plate is further segmented into multiple regions (first region, second region, third region) with different width variations, allowing each segment to contribute to different frequency ranges and operational modes
Solution Approach 2:
The antenna device achieves multi-functionality by enabling multiple operational modes through the interaction of conductor plates. The second conductor plate's width variation creates both a first operational mode (when width increases away from the first conductor plate) and a second operational mode (when width increases toward the first conductor plate), allowing the antenna to operate across extended frequency ranges with a single structure
2Adaptability or versatility
If the outer edge length of the radiating element is increased to broaden frequency range, then more frequency bands can be received, but the antenna size increases
Solution Approach 1:
The second conductor plate utilizes width variation in the direction parallel to the first conductor plate instead of simply extending the outer edge length. By controlling the width at different positions (increasing away from or toward the first conductor plate), the antenna achieves extended frequency coverage without proportionally increasing the overall antenna footprint
Solution Approach 2:
The third conductor plate is capacitively coupled to the fourth end portion of the second conductor plate and nested within the overall antenna structure. This nested configuration allows additional frequency range extension through capacitive coupling effects without significantly increasing the external dimensions of the antenna device
3Adaptability or versatility
If multiple conductor plates with different configurations are used to expand frequency range, then both 4G and 5G bands can be supported, but the device complexity increases
Solution Approach 1:
Each conductor plate is designed with specific local characteristics: the first conductor plate provides the feeding structure, the second conductor plate has position-dependent width variations to create different operational modes, and the third conductor plate provides capacitive coupling. These localized quality differences enable each component to contribute specifically to achieving 4G and 5G band compatibility
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 enables the antenna device to readily broaden its receivable frequency range, supporting both 4G and 5G communication bands from 700 MHz to 6 GHz, with improved directivity and reduced size, making it suitable for integration into vehicle window glass structures.
Implementation Method 1
a third conductor plate including a fifth end portion capacitively coupling with the fourth end portion
Data Source
AI summary
An antenna device includes a first conductor plate including a first end portion and a second end portion, the first conductor plate being provided with a first feeding portion between the first end portion and the second end portion, a second conductor plate including a third end portion connected to the first feeding portion, a fourth end portion located at a position away from the first conductor plate, and a plate surface of which width in a direction parallel to the first conductor plate increases with a distance from the third end portion toward the fourth end portion, and a third conductor plate including a fifth end portion capacitively coupling with the fourth end portion, a sixth end portion connected, on a same side as the first end portion with respect to the first feeding portion, to the first conductor plate, and a counter portion opposite the plate surface.