Slim Mobile Antenna With Three-Sided Ground Coupling
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Solution Overview
Problem
Existing mobile communication devices face challenges in designing a slim WWAN antenna that is tightly coupled to the system ground plane while maintaining effective wideband operation, as prior art antennas require a larger no-ground portion to avoid performance degradation, leading to reduced interior space for electronic components.
Innovation Solution
The antenna structure includes a dielectric substrate with a no-ground portion surrounded by a ground element, featuring a feeding edge and a non-feeding edge, where the non-feeding side edge of the antenna element is short-circuited to the ground element, allowing for tight coupling and efficient use of interior space, with a feeding line connected to the feeding side edge, enabling effective wideband operation across 824–960 MHz and 1710–2170 MHz bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna is disposed on a no-ground portion to achieve wideband operation, then the operating bandwidth is improved, but the no-ground portion size increases and reduces the ground portion area for electronic components
Solution Approach 1:
The patent applies local quality by creating different ground plane configurations at different locations. Specifically, the no-ground portion is surrounded by ground planes on three sides (left, right, and bottom edges) rather than having a uniform ground configuration. This localized ground arrangement allows the antenna to achieve wideband operation while minimizing the overall no-ground portion area, thus preserving more space for electronic components on the ground portion.
2Adaptability or versatility
If the antenna is tightly coupled to the system ground plane to improve integration, then the space utilization is improved, but the antenna performance may be degraded due to edge clearance requirements
Solution Approach 1:
The patent uses local quality to provide ground plane coupling only where needed for antenna performance. The no-ground portion is surrounded by ground planes on three sides, creating localized coupling regions that maintain antenna performance while enabling tight integration with the system ground plane. This selective grounding approach allows the antenna to be tightly coupled without requiring excessive clearance distances that would degrade performance.
Solution Approach 2:
The patent transitions from a traditional single-plane ground configuration to a three-sided surrounding ground structure. By adding ground planes on multiple edges (left, right, and bottom) rather than just one side, the invention creates a more effective coupling in multiple dimensions, improving both integration and performance simultaneously.
Data Source
AI summary
A slim mobile communication device includes an antenna structure. The antenna structure includes a dielectric substrate, a ground element, an antenna element, and a feeding line. The antenna element is a planar structure and is disposed on a no-ground portion of the dielectric substrate. At least two edges of the no-ground portion are surrounded by a ground element of the dielectric substrate, wherein one of the edges used as a feeding edge and the other edges are non-feeding edges. A distance between the non-feeding side edge of the antenna element and the second edge of the no-ground portion is smaller than 3 mm. A length of the non-feeding side edge of the antenna element is at least 5 mm. The non-feeding side edge of the antenna element is short-circuited to the ground element. The feeding line is coupled to the feeding side edge of the antenna element.