Meander Capacity Loading Plate for Compact Multi-Band Antenna
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Solution Overview
Problem
Incorporating multiple antennas in a single casing for FM broadcast, GPS, and satellite digital radio signals into a compact, low-profile antenna device poses a challenge as the top capacity loaded type monopole antenna's capacity loading plate can deteriorate the gain of planar antennas due to its positioning and shape.
Innovation Solution
The capacity loading plate of the top capacity loaded type monopole antenna is arranged above the antenna base plate in a meander shape, parallel to the flat surface, with its width and interval optimized to minimize interference with planar antennas, ensuring the gain of these antennas is not significantly affected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a top capacity loaded type monopole antenna is used to achieve a low profile antenna device, then the antenna profile is reduced, but the capacity loading plate deteriorates the gain of planar antennas due to its positioning and shape
Solution Approach 1:
The patent applies parameter changes by optimizing the width and interval of the meander-shaped capacity loading plate. Specifically, the width is set to less than 1/4 wavelength and the interval is set to less than 1/20 wavelength of the receiving frequency, which minimizes the harmful electromagnetic interference to the planar antenna while maintaining the low profile characteristic
Solution Approach 2:
The capacity loading plate is configured in a meander shape that extends primarily in the length direction while maintaining a constrained width. This dimensional arrangement allows the plate to provide the necessary capacitive loading for the monopole antenna while minimizing its projection area in the width direction, thereby reducing interference with the planar antenna below
2Volume of moving object
If multiple antennas are incorporated in a single casing for FM, GPS, and satellite digital radio, then the device becomes compact and aesthetically pleasing, but the capacity loading plate interferes with planar antenna performance
Solution Approach 1:
The patent applies local quality by creating specific spatial zones with different electromagnetic characteristics. The meander-shaped capacity loading plate is designed with controlled width and interval parameters that create localized electromagnetic fields confined to specific regions, minimizing interference in the area where the planar antenna operates
Solution Approach 2:
The capacity loading plate is segmented into a meander shape with multiple folds and intervals rather than a solid continuous structure. This segmentation creates gaps and reduces the continuous electromagnetic interference area, allowing the planar antenna to operate with minimal degradation while maintaining compact integration
Data Source
Figure 1A~1C
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AI summary
An antenna device includes: an antenna base plate having a shape of a flat plate; a capacity loading plate of a top capacity loaded type monopole antenna, the capacity loading plate arranged in parallel with the antenna base plate; and a planar antenna arranged between the antenna base plate and the capacity loading plate. A size of at least a part of the capacity loading plate in a direction of width of the capacity loading plate is less than about 1/4 wavelength of receiving frequency of the planar antenna, and edges of the capacity loading plate in the direction of width of the capacity loading plate are folded back so that the capacity loading plate has a meander shape extending in a direction of length of the capacity loading plate.