Switchable Antenna Structure for Wideband Coverage in Compact Electronics
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Solution Overview
Problem
The miniaturization of electronic devices, such as laptop computers, limits the available internal space for antennas, leading to insufficient bandwidth and efficiency in transmitting and receiving multiple wireless frequency bands.
Innovation Solution
The antenna structure incorporates a grounding element, a feeding radiation element with multiple radiating portions and grounding arms, a switching circuit, and a parasitic radiation element. The switching circuit allows signals to pass through different grounding arms, enabling the antenna to cover multiple frequency bands by adjusting the signal paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electronic device is miniaturized with a narrow screen frame, then the device size and weight are reduced, but the available internal space for antenna placement is limited, leading to insufficient bandwidth
Solution Approach 1:
The antenna structure is divided into multiple independent radiating elements (first radiating element, second radiating element, third radiating element) with different geometries. Each element is optimized for specific frequency bands, allowing the antenna system to cover multiple bands (LTE 700MHz, 800MHz, 900MHz, 1800MHz, 2100MHz, 2600MHz) within the limited device space.
Solution Approach 2:
The patent utilizes three-dimensional space by positioning radiating elements on different surfaces and layers of the device housing. The first radiating element is on the front surface, the second radiating element is on the rear surface, and the third radiating element connects these surfaces, effectively utilizing the Z-dimension to maximize antenna performance within the constrained volume.
2Adaptability or versatility
If multiple wireless frequency bands are transmitted and received, then the antenna versatility is improved, but the antenna efficiency and bandwidth are reduced due to limited internal space
Solution Approach 1:
The antenna system employs multiple specialized radiating elements, each optimized for specific frequency ranges. The first radiating element handles lower frequencies, the second radiating element handles higher frequencies, and the third radiating element provides additional coverage, ensuring high efficiency across all LTE bands without compromising overall antenna performance.
Solution Approach 2:
The antenna structure achieves multi-functionality by integrating multiple radiating elements that can operate across different frequency bands simultaneously. The shared grounding structure and feeding mechanism allow the antenna system to serve multiple communication functions (voice, data, messaging) across various LTE bands while maintaining efficient radiation performance.
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 allows the antenna to efficiently cover a wide range of frequency bands, including LTE frequencies from 617 MHz to 5,925 MHz, while maintaining good radiation efficiency and adjustability, even in the limited space of a miniaturized electronic device.
Implementation Method 1
a first parasitic radiation element connected to the grounding element and coupled with the feeding radiation element
Data Source
AI summary
An electronic device includes a housing, an antenna structure, and a feeding element. The antenna structure includes a grounding element, a feeding radiation element, a switching circuit, and a first parasitic radiation element. The feeding radiation element includes a feeding portion, a first radiating portion, a second radiating portion, a first grounding arm, and a second grounding arm. The feeding portion is connected between the first radiating portion and the second radiating portion. The first grounding arm and the second grounding arm are connected to the first radiating portion. The switching circuit is electrically connected to the first grounding arm and the second grounding arm. The first parasitic radiation element is connected to the grounding element and coupled with the feeding radiation element.