Multiband Antenna Using 3D Nested Radiation Elements
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Solution Overview
Problem
Conventional antenna apparatuses with folded structures face challenges in achieving multiband operation, particularly in the 800 MHz band, while maintaining a small size and reducing thickness, due to increased radiation impedance and size requirements.
Innovation Solution
The antenna apparatus features a feed point, ground point, first and second base radiation elements, and first and second branch radiation elements, with specific configurations allowing for multiband operation by adjusting the distance and orientation of these elements to achieve wide band characteristics and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional folded structure antenna apparatuses are used to achieve multiband operation, then the antenna can support multiple frequency bands, but the size and thickness of the antenna apparatus increases
Solution Approach 1:
The patent transitions from conventional planar folded structures to a three-dimensional configuration where radiation elements extend in multiple spatial directions. The first and second base radiation elements and branch radiation elements are arranged in a 3D space with specific orientations, allowing the antenna to achieve multiband operation without increasing overall footprint area, thus resolving the contradiction between multiband capability and compact size.
Solution Approach 2:
The patent employs a nested arrangement where branch radiation elements are positioned within or adjacent to the structure formed by base radiation elements. This nesting allows multiple radiating paths for different frequency bands to be compactly integrated, enabling multiband operation while minimizing the overall antenna volume.
2Adaptability or versatility
If conventional folded structure antenna apparatuses are used to achieve multiband operation, then the antenna can support multiple frequency bands, but the radiation impedance increases
Solution Approach 1:
The patent applies local quality by making different parts of the antenna structure have different characteristics. The base radiation elements and branch radiation elements have different lengths, orientations, and positions, creating localized variations in the electromagnetic field distribution. This allows each element to contribute to specific frequency bands with optimized impedance characteristics, reducing overall radiation impedance while maintaining multiband capability.
Solution Approach 2:
The antenna is segmented into multiple independent radiation elements (first base radiation element, second base radiation element, first branch radiation element, second branch radiation element) that can be independently optimized. Each segment contributes to different frequency bands, allowing the overall structure to achieve multiband operation with controlled impedance by adjusting individual element parameters rather than relying on a single large folded structure.
3Stability of the object's composition
If conventional folded structure antenna apparatuses are used, then the antenna structure is established, but the thickness of the antenna apparatus increases
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement where radiation elements are oriented in multiple directions (x-direction, y-direction, z-direction) rather than being confined to a single plane. This dimensional distribution allows the antenna to achieve structural stability through spatial configuration while minimizing the thickness dimension, as the stability is provided by the 3D geometric arrangement rather than increased thickness.
Data Source
AI summary
A first base radiation element has a first end connected to the feed point, and a second end. A second base radiation element has a first end connected to the ground point, and a second end. The first and second base radiation elements respectively include portions extending in a first direction and close to each other. The first base radiation element is branched into first and second branch radiation elements at a first branch point located at the second end of the first base radiation element, the first branch radiation element includes a portion extending in the first direction, and the second branch radiation element includes a portion extending in a second direction opposite to the first direction. The end of the second base radiation element is connected to a connecting point different from the first branch point of the first branch radiation element.