Glass-Antenna F-L Elements Dual-Band DAB Reception
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Solution Overview
Problem
Designing a glass antenna that can effectively receive both Band III and L-Band frequencies for DAB is challenging due to the significant frequency band separation, requiring a solution that enhances reception sensitivity for dual-band applications.
Innovation Solution
A glass antenna design featuring a first and second feeding portion with F-shaped and L-shaped antenna elements, respectively, connected to signal-side and ground-side feeding portions, optimizing conductor lengths to improve antenna gain across both frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional glass antenna design is used, then the structure is simple, but the reception sensitivity for dual-band DAB is insufficient
Solution Approach 1:
The antenna conductor is divided into multiple distinct elements (first antenna element with F-shape, second antenna element with L-shape) that are connected to different feeding portions. This segmentation allows each element to be optimized for specific frequency bands while maintaining overall dual-band functionality, resolving the contradiction between reception sensitivity and structural simplicity.
Solution Approach 2:
Different portions of the antenna conductor are given different geometric shapes (F-shape for first antenna element, L-shape for second antenna element) and connected to different feeding portions (signal-side and ground-side). This local differentiation enables each segment to contribute differently to the overall reception characteristics, improving dual-band sensitivity without requiring complete structural redesign.
2Adaptability or versatility
If a single antenna element is used, then the device complexity is low, but the adaptability to different frequency bands is insufficient
Solution Approach 1:
The antenna conductor is segmented into multiple functional elements (first antenna element connected to first feeding portion, second antenna element connected to second feeding portion) with distinct geometric shapes. This segmentation enables the antenna to adapt to different frequency bands by utilizing the appropriate elements, achieving dual-band versatility while maintaining a relatively organized and manageable structure.
Solution Approach 2:
The invention introduces geometric dimensionality variations through F-shaped and L-shaped antenna elements with different conductor length configurations. These dimensional changes in the antenna conductor geometry enable resonance at different frequencies, providing adaptability to multiple bands without requiring completely separate antenna systems.
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 design achieves high reception sensitivity for dual-band DAB, with specific conductor length configurations enhancing antenna gain for Band III and L-Band frequencies without affecting the other band's reception characteristics.
Implementation Method 1
a first antenna element that is connected to the first feeding portion and a second antenna element that is connected to the second feeding portion
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A glass antenna arranged at a window glass (23) includes a signal-side feeding portion (16) and a ground-side feeding portion (17) that are aligned in a vertical direction; an F-shaped element that is formed into an F-shape by a linear conductor (1) connected to the signal-side feeding portion (16) and extending in the horizontal direction and linear conductors (2, 3) extending in the vertical direction from the linear conductor (1) as an origin; and an L-shaped element formed into an L-shape by a linear conductor (4) connected to the ground-side feeding portion (17) and extending in the horizontal direction and a linear conductor (5) extending upward from the linear conductor (4) as an origin.