Switchable Antenna Structure for Multi-Band Narrow-Bezel Devices
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Solution Overview
Problem
The challenge of designing an antenna structure that can transmit and receive multiple wireless frequency bands efficiently within the limited internal space of a miniaturized electronic device, such as a notebook computer, is exacerbated by the trend towards thinner and lighter designs with narrow screen frames.
Innovation Solution
An antenna structure comprising a grounding element, feeding radiation element, feeding element, first grounding radiation element, and a switching element, which allows switching between different operating frequency bands by adjusting the configuration of the switching element to couple different radiating portions and grounding elements, enabling generation of multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the electronic device is miniaturized with thinner and lighter designs, then the device portability is improved, but the available internal space for antenna placement is reduced
Solution Approach 1:
The antenna structure embeds multiple radiating elements (first radiating element, second radiating element, third radiating element) and grounding elements within a compact planar configuration. The elements are arranged in a nested manner where the first radiating element includes a feeding portion and arm, the second radiating element is positioned adjacent to the first, and the third radiating element extends from the first, all sharing common grounding structures. This nesting allows multiple frequency bands to be accommodated in a limited space area.
Solution Approach 2:
The antenna structure transitions from traditional three-dimensional vertical arrangements to a two-dimensional planar configuration. The radiating elements are arranged in a planar layout with specific geometric shapes (L-shaped, T-shaped, or cross-shaped configurations) that enable multi-frequency operation within the constrained internal space of miniaturized devices, effectively utilizing the available surface area rather than vertical depth.
2Area of stationary object
If the screen frame is narrowed, then the device aesthetics and display area are improved, but the antenna bandwidth is reduced
Solution Approach 1:
The antenna structure is designed as a multi-functional system that can operate across multiple frequency bands (first frequency band, second frequency band, third frequency band) using the same physical structure. The first radiating element, second radiating element, and third radiating element work together with common grounding elements to provide universal coverage for different wireless communication standards, ensuring the antenna remains versatile despite the narrowed frame constraints.
Solution Approach 2:
The antenna structure incorporates switching elements that dynamically configure the electrical connections between radiating elements and grounding elements. This dynamic reconfiguration allows the antenna to adapt its electrical length and resonance characteristics, enabling it to maintain adequate bandwidth across multiple frequency bands within the constrained physical space of the narrowed frame design.
3Adaptability or versatility
If multiple frequency bands are supported, then the wireless communication versatility is improved, but the antenna structure complexity increases
Solution Approach 1:
The antenna structure merges multiple radiating elements (first, second, and third radiating elements) and grounding elements into a single integrated structure. The elements share common grounding references and are interconnected through feeding elements, reducing the need for separate antenna structures for each frequency band. This consolidation achieves multi-frequency support while controlling overall structural complexity through unified design.
Solution Approach 2:
The antenna structure segments the radiating function into distinct elements (first radiating element with feeding portion and arm, second radiating element, third radiating element) that can be independently configured for different frequency bands. Each segment can be optimized for specific frequency ranges while working together as a coordinated system, managing complexity through functional segmentation rather than monolithic design.
4Length of stationary object
If the antenna space is limited, then the device thickness is reduced, but the antenna efficiency deteriorates
Solution Approach 1:
The antenna structure optimizes local electromagnetic field distribution by strategically positioning radiating elements and grounding elements in specific geometric configurations. The first radiating element's arm, the second radiating element, and the third radiating element are arranged to create favorable local field patterns that enhance radiation efficiency. The grounding elements are positioned to provide optimal reference planes, ensuring efficient operation despite the reduced overall device thickness.
Data Source
AI summary
An antenna structure and an electronic device are provided. The electronic device includes a housing and the antenna structure disposed in the housing. The antenna structure includes a grounding element, a feeding radiation element, a feeding element, a first grounding radiation element, and a switching element. The feeding radiation element includes a first radiating portion, a second radiating portion, and a third radiating portion. The first radiating portion and the second radiating portion jointly surround the first grounding radiation element. The first radiating portion and the first grounding radiation element are separate from each other and coupled with each other. The switching element is electrically connected to the first grounding radiation element.