Switchable Antenna Structure for Wideband Coverage in Narrow Bezels
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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, due to the requirement of a narrow screen frame.
Innovation Solution
The antenna structure incorporates a grounding element, a feeding radiation element, a switching circuit, and a parasitic radiation element with varying branch lengths, allowing the switching circuit to switch between different modes to couple the radiating portions and parasitic elements, thereby covering multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna structure is miniaturized to fit narrow screen frame requirements, then the device size is reduced, but the bandwidth coverage becomes insufficient
Solution Approach 1:
The antenna structure is divided into multiple radiating elements with different lengths (first radiating element, second radiating element, third radiating element) and a parasitic radiation element with multiple branches. Each segment resonates at different frequencies, enabling wide bandwidth coverage while maintaining a compact overall structure that fits within narrow screen frames.
Solution Approach 2:
The patent employs a nested configuration where the parasitic radiation element with its first and second branches is positioned adjacent to and interacts with the main radiating elements. The feeding element connects to multiple radiating elements in a cascaded manner, creating a compact nested arrangement that maximizes electrical length within minimal physical space, thereby achieving wide bandwidth coverage without increasing device volume.
2Adaptability or versatility
If multiple frequency bands are covered using traditional antenna designs, then the bandwidth is sufficient, but the device becomes larger and heavier
Solution Approach 1:
The antenna structure is designed as a multi-functional system where a single integrated antenna assembly performs multiple functions: the first radiating element, second radiating element, and third radiating element each contribute to different frequency bands, while the parasitic radiation element with its switched branches provides additional bandwidth extension. This universal design eliminates the need for multiple separate antennas, reducing device size while maintaining comprehensive frequency band coverage from sub-1GHz to millimeter-wave frequencies.
3Shape
If the screen frame is made narrower for aesthetic purposes, then the device appearance is improved, but the available internal space for antenna placement is reduced
Solution Approach 1:
The antenna structure utilizes three-dimensional spatial arrangement and multi-layer configuration to achieve wide bandwidth coverage within the constrained two-dimensional screen frame area. The radiating elements are arranged in different orientations and layers, with the parasitic element positioned to interact electromagnetically with the main elements without requiring additional planar space. This dimensional optimization allows the antenna to fit within narrow screen frames while maintaining sufficient effective radiating area.
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 antenna structure effectively covers a wide range of frequency bands from 617 MHz to 5,925 MHz, maintaining good radiation efficiency and adaptability, suitable for use as a main antenna in electronic devices.
Implementation Method 1
The antenna structure includes a feeding radiation element, a first parasitic radiation element, and a switching circuit. In response to the switching circuit being switched to a first mode, a signal passes through a first grounding branch, and a first radiating portion and the first parasitic radiation element are coupled with each other. In response to the switching circuit being switched to a second mode, the signal passes through a second grounding branch, and the first radiating portion and the first parasitic radiation element are coupled with each other.
Data Source
AI summary
An electronic device and an antenna structure are provided. The antenna structure includes a grounding element, a feeding radiation element, a feeding element, a switching circuit, and a first parasitic radiation element. The feeding radiation element includes a feeding portion, a first radiating portion, and a second radiating portion. The feeding portion is connected between the first radiating portion and the second radiating portion. The feeding element includes a grounding end and a feeding end. The grounding end is connected to the grounding element. The feeding end is connected to the feeding portion or the second radiating portion. The switching circuit is electrically connected to the grounding element. The first parasitic radiation element includes a first grounding branch and a second grounding branch. The first grounding branch and the second grounding branch are electrically connected to the switching circuit.