Notched Patch Antenna Coupling Structure for Wider Bandwidth
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Solution Overview
Problem
Patch antennas have a relatively narrow bandwidth, limiting their application in wireless terminals that require broader frequency ranges.
Innovation Solution
The antenna device incorporates a metal layer with a notch portion and a second metal as an electromagnetic field coupling element, connected via a feeder line, where the width at the opening portion is narrower than the maximum width inside the notch, allowing for broader bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional patch antenna is used, then the antenna structure is simple, but the bandwidth is narrow
Solution Approach 1:
The antenna element is segmented by introducing a notch portion that divides it into multiple regions. This segmentation creates distinct functional zones including a first metal region, a notch portion with a second metal, and a third metal region, allowing different parts to contribute differently to the overall bandwidth performance
Solution Approach 2:
The second metal is nested within the notch portion of the first metal, creating a compact structure where the electromagnetic field coupling element is positioned inside the main antenna element. This nesting arrangement enables bandwidth enhancement without significantly increasing the overall antenna footprint
Solution Approach 3:
The invention transitions from a conventional two-dimensional patch antenna to a three-dimensional structure by adding vertical layering with the ground layer and introducing the notch portion that creates depth. The second metal positioned within the notch adds a vertical dimension to the electromagnetic field distribution, enhancing bandwidth
2Adaptability or versatility
If the second metal width at the opening is made smaller, then the bandwidth increases, but the manufacturing precision requirements increase
Solution Approach 1:
The second metal is designed with non-uniform width characteristics, where the width at the opening portion is specifically made smaller than the maximum width at the portion inside the notch. This local quality variation optimizes the electromagnetic field coupling at the opening while maintaining sufficient width internally for effective coupling, thereby enhancing bandwidth without requiring extreme manufacturing precision across the entire structure
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
The design achieves a 23% increase in bandwidth, enabling applications in wireless terminals such as smartphones and supporting Ultra Wide Band communication with improved signal handling and distance measurement capabilities.
Implementation Method 1
a second metal being an electromagnetic field coupling element arranged with a predetermined distance spaced from the first metal inside the notch portion
Data Source
AI summary
An antenna device includes a metal layer for forming an antenna element in a predetermined planar shape and a ground arranged on a lower side of the metal layer. The metal layer forms a first metal forming the planar shape, a notch portion formed at the first metal, and cutting out a part of an edge of the planar shape, a second metal being an electromagnetic field coupling element arranged with a predetermined distance spaced from the first metal inside the notch portion, and a feeder line formed outside the planar shape, and to be connected with the second metal via an opening portion of the notch portion. For the second metal, a width at the opening portion is smaller than a maximum width at a portion more inside the notch portion than the opening portion.