Low-Profile Antenna Element With Segmented Metal Projections
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Solution Overview
Problem
Designing a low-profile multi-band antenna element for mobile communication devices is challenging due to limited space, especially in thin and light devices like tablets, where conventional designs suffer from high efficiency loss and increased size.
Innovation Solution
A low-profile antenna element comprising two separate metal elements with distinct configurations, including a capacitive element and matching circuits, which allows for efficient coverage of WWAN/LTE bands by controlling low and high bands separately, reducing mutual coupling and overall height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional antenna designs are used to cover multiple bands, then the antenna can achieve broad frequency coverage, but the antenna height increases and manufacturing complexity increases
Solution Approach 1:
The antenna element is divided into two separate metal elements (first and second metal elements) that are not connected to each other. Each metal element is configured to control different frequency bands, with the first metal element controlling a low band and the second metal element controlling a high band. This segmentation allows independent optimization of each element for its specific band, achieving multi-band coverage while maintaining low profile.
Solution Approach 2:
The patent utilizes the vertical dimension by positioning the antenna element adjacent to an edge of the ground element with projections on the edge. The first metal element extends parallel to the edge and is coupled through a shorting element to the ground element, while the second metal element has an open end. This spatial arrangement in multiple dimensions enables compact multi-band operation without increasing overall height.
2Adaptability or versatility
If conventional antenna designs are used to cover multiple bands, then the antenna can achieve broad frequency coverage, but the device complexity increases
Solution Approach 1:
The antenna is segmented into two independent metal elements that can be manufactured separately and then assembled. This segmentation simplifies the manufacturing process for each individual element while achieving complex multi-band performance when combined, reducing overall device complexity.
Solution Approach 2:
Both metal elements share common coupling structures with the ground element and communication module, allowing a unified design approach for mounting and electrical connection. This universality reduces the number of unique components and simplifies the overall antenna system despite supporting multiple bands.
3Adaptability or versatility
If conventional antenna designs are used, then the antenna can cover multiple bands, but efficiency loss increases
Solution Approach 1:
By separating the antenna into two independent metal elements for different bands, each element can be optimized for its specific frequency range without interference from other bands. This reduces mutual coupling losses and improves efficiency for each band compared to a single conventional multi-band antenna.
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 solution achieves a low-profile design with efficient antenna performance, covering multiple bands (GSM850/900 to LTE2300/2500) with reduced size and minimal efficiency loss, maintaining high antenna efficiency across the operating bands.
Implementation Method 1
the first end is coupled through a capacitive element to a communication module
Implementation Method 2
the second end is coupled through a shorting element to the ground element
Implementation Method 3
the first metal element is excited to generate a first band, the second metal element is excited to generate a second band
Data Source
AI summary
A communication device includes a ground element and an antenna element. The antenna element is disposed adjacent to an edge of the ground element. The antenna element includes a first metal element and a second metal element. The first metal element has a first end and a second end. The first end is coupled through a capacitive element to a communication module. The second end is coupled through a shorting element to the ground element. The second metal element has a third end and a fourth end. The third end is coupled to the communication module. The fourth end is open. The first metal element and the second metal element are adjacent to each other, but not connected to each other. The first metal element and the second metal element have projections on the edge of the ground element, wherein the projections do not overlap with each other.