Loop Antenna Structure for Wideband Mobile WLAN Coverage
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Solution Overview
Problem
Designing a small-size, wideband antenna structure that effectively covers multiple frequency bands without compromising communication quality remains a challenge in mobile devices, as existing antennas often have insufficient operational bandwidth.
Innovation Solution
The proposed antenna structure includes a main ground plane, a protruding ground plane, feeding, connection, shorting, first, and second radiation elements, configured in a loop shape with specific dimensions and orientations to cover frequency bands from 2400 MHz to 7125 MHz, utilizing metal materials and a dielectric substrate to achieve impedance matching and wideband operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced, then the device size is reduced, but the operational bandwidth becomes insufficient
Solution Approach 1:
The antenna is divided into multiple radiation elements (first radiation element, second radiation element, third radiation element) with different lengths and configurations. Each element contributes to different frequency bands, allowing the compact antenna to achieve wideband operation by segmenting the radiation function across multiple elements rather than relying on a single large element.
Solution Approach 2:
The antenna structure utilizes three-dimensional space efficiently by arranging radiation elements in different orientations and positions. The first radiation element extends in a first direction, the second radiation element extends in a second direction, and the third radiation element connects them, creating a spatial configuration that maximizes electromagnetic radiation efficiency within a compact volume.
2Ease of manufacture
If the antenna structure is simplified, then the manufacturing is easier, but the impedance matching and wideband performance deteriorate
Solution Approach 1:
The ground plane serves multiple functions simultaneously: it provides the reference potential for impedance matching, acts as a reflector to enhance radiation, and forms part of the resonant structure. The feeding structure also serves dual purposes by both feeding the antenna and contributing to the overall resonant length, reducing the need for additional separate components.
Solution Approach 2:
The antenna achieves wideband impedance matching by carefully controlling the lengths and positions of different radiation elements. The first radiation element has a specific length for lower band operation, the second radiation element has a different length for upper band operation, and their relative positions are optimized to maintain consistent impedance across the wide frequency range.
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 provides wideband coverage across multiple frequency bands, supporting WLAN and Wi-Fi 6E operations with improved impedance matching and operational bandwidth, suitable for various mobile communication devices and IoT applications.
Implementation Method 1
The antenna structure includes a main ground plane, a protruding ground plane, feeding, connection, shorting, first, and second radiation elements, configured in a loop shape with specific dimensions and orientations to cover frequency bands from 2400 MHz to 7125 MHz
Data Source
AI summary
An antenna structure includes a main ground plane, a protruding ground plane, a feeding radiation element, a connection radiation element, a shorting radiation element, a first radiation element, and a second radiation element. The protruding ground plane is coupled to the main ground plane. The feeding radiation element has a feeding point. The connection radiation element is coupled to the feeding radiation element. The connection radiation element is further coupled through the shorting radiation element to the protruding ground plane. The first radiation element is coupled to the feeding radiation element. The second radiation element is coupled to the connection radiation element. The protruding ground plane further includes an extension portion. The first radiation element is adjacent to the extension portion of the protruding ground plane.