Antenna Structure With Notch Grounding For WWAN Bandwidth
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Solution Overview
Problem
Conventional antenna configurations in mobile communication devices are inefficient in terms of space utilization and radiation efficiency due to their placement, which can be affected by a user's hand, especially when aiming for wide band operations like five-band WWAN.
Innovation Solution
An antenna structure is designed with a feeding portion and a shorting portion forming a U shape, disposed in a notch of the grounding element's edge, allowing for increased distance from the user's hand and utilizing coupling gaps to achieve dual-resonance modes covering 824 MHz to 960 MHz and 1710 MHz to 2170 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna is disposed in an edge of the grounding element to achieve wide band operation, then the operating bandwidth is improved, but the antenna cannot be tightly combined with the grounding element resulting in waste of interior space
Solution Approach 1:
The antenna is segmented into multiple sections: a first section disposed in the notch of the grounding element edge, a second section extending from the first section, and a third section coupled to the second section. This segmentation allows the antenna to achieve wide band operation through multiple resonant modes while being tightly integrated into the grounding element structure, resolving the contradiction between bandwidth and space utilization.
Solution Approach 2:
The antenna is nested within the grounding element structure by disposing it in a notch of the grounding element edge. The antenna elements are positioned within the boundaries of the grounding element, maximizing space utilization while maintaining the required operating bandwidth through strategic placement and configuration.
2Device complexity
If the antenna is disposed in an edge of the grounding element, then the structure is simplified, but the radiation efficiency is easily affected by the user's hand
Solution Approach 1:
The antenna is positioned in a specific location - a notch of the grounding element edge - which provides different electromagnetic characteristics compared to other positions. This local placement creates a region with favorable radiation properties that are less sensitive to hand effects, while maintaining structural simplicity. The notch location provides a local electromagnetic environment that isolates the antenna from direct hand contact interference.
3Adaptability or versatility
If the antenna occupies the overall edge to achieve wide band operation, then the operating bandwidth is improved, but the distance to the user's hand is reduced increasing hand-induced interference
Solution Approach 1:
The antenna is positioned in a specific location - a notch of the grounding element edge - which provides different electromagnetic characteristics compared to other positions. This local placement creates a region with favorable radiation properties that are less sensitive to hand effects, while maintaining structural simplicity. The notch location provides a local electromagnetic environment that isolates the antenna from direct hand contact interference.
Solution Approach 2:
The antenna configuration uses multiple sections arranged in specific spatial dimensions - the first section in the notch, the second section extending parallel to it, and the third section coupled to the second section. This multi-dimensional arrangement creates multiple resonant modes for wide band operation while the strategic positioning in the notch dimension provides separation from hand-induced interference.
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 effectively reduces hand-induced interference and achieves five-band WWAN operation by exciting quarter-wavelength and higher-order resonant modes, ensuring efficient radiation and space utilization.
Implementation Method 1
exciting quarter-wavelength and higher-order resonant modes
Data Source
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AI summary
A communication electronic device (1, 3, 4, 5) includes an antenna structure at least having a grounding element (10, 30) and an antenna element (11, 31, 41, 51). One edge of the grounding element (10, 30) has a notch (101, 301), and the antenna element (11, 31, 41, 51) is disposed in the notch (101, 301) of the grounding element (10, 30). The antenna element (11, 31, 41, 51) includes a feeding portion (13) and a shorting portion (14), wherein the feeding portion (13) at least includes a first segment (131), a second segment (132), and a third segment (133). There is a first coupling gap (151) between the second segment (132) of the feeding portion (13) and a first shorting segment (141) of the shorting portion (14) which includes an open end of the shorting portion (14). There is a second coupling gap (152) between the third segment (133) of the feeding portion (13) and a second shorting segment (142) of the shorting portion (14) which includes a shorting end (143) of the shorting portion (14).