Notched Grounding Trace Antenna for Compact Mobile Devices
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Solution Overview
Problem
Compact mobile devices face challenges in achieving sufficient antenna bandwidth and performance degradation due to user-handling, which affects wireless communication efficiency across various frequency bands.
Innovation Solution
The design incorporates a ground plane, a grounding trace with a notch, and a feeding trace that form an antenna structure, where the feeding trace's end is coupled to a signal source and extends into the notch of the grounding trace, allowing for adjustable operation bands by varying the widths and lengths of trace components, and optionally includes an inductor to minimize size and enhance frequency coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to fit compact mobile devices, then the device portability is improved, but the antenna bandwidth becomes insufficient
Solution Approach 1:
The antenna is divided into multiple segments including a grounding trace with a notch portion and a feeding trace. The grounding trace is segmented into different portions (first grounding trace portion, second grounding trace portion) that can be independently optimized. This segmentation allows each segment to contribute differently to the overall bandwidth while maintaining a compact total size.
Solution Approach 2:
The antenna structure utilizes the notched portion in the grounding trace to extend the effective electrical length without increasing the physical footprint. By creating a notch that extends into the grounding trace, the design adds dimensional complexity in the trace layout while maintaining a compact overall antenna size, thereby increasing bandwidth capability.
2Volume of moving object
If the antenna structure is made compact, then the device size is reduced, but the radiation performance deteriorates
Solution Approach 1:
Different portions of the antenna structure are designed with different local characteristics. The grounding trace has a notched portion with specific dimensional parameters that differ from the feeding trace. By optimizing the local geometry of each portion (width, length, notch depth), the radiation performance is enhanced while maintaining overall compactness.
3Adaptability or versatility
If the antenna operates across multiple frequency bands, then the wireless communication coverage is improved, but the antenna structure complexity increases
Solution Approach 1:
The antenna structure is designed to serve multiple frequency bands (GSM850/900, WCDMA Band 1, LTE Band 7) using a single integrated configuration. The notched grounding trace and feeding trace work together to provide resonant frequencies across multiple bands, eliminating the need for separate antennas for each band and thereby reducing overall system complexity.
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 enables the mobile device to effectively cover wideband frequencies such as GSM850/900/1800/1900/WCDMA Band 1 and LTE Band 7, while reducing interference from user handling and maintaining good radiation performance.
Implementation Method 1
an antenna structure is formed by the grounding trace and the feeding trace, the feeding end of the feeding trace is coupled to a signal source
Data Source
AI summary
A mobile device includes a ground plane, a grounding trace, and a feeding trace. The grounding trace defines a notch, and has a shorted end coupled to the ground plane. The feeding trace is disposed adjacent to the grounding trace, and has a feeding end and an open end. An antenna structure is formed by the grounding trace and the feeding trace. The feeding end of the feeding trace is coupled to a signal source. The open end of the feeding trace substantially extends into the notch of the grounding trace.