Slot-Coupled Multiband Antenna Structure for Mobile Bandwidth
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Solution Overview
Problem
Existing antennas in mobile devices often have insufficient bandwidth, leading to poor communication quality, particularly in supporting multiple wireless communication frequency bands.
Innovation Solution
A multiband antenna structure comprising a metal mechanism element with a slot, a ground element, a feeding radiation element, and a dielectric substrate, designed to generate multiple frequency bands through a coupling mechanism, with specific element configurations and shapes to enhance bandwidth and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna design is used, then the device structure is simple, but the bandwidth is insufficient and communication quality suffers
Solution Approach 1:
The antenna structure is segmented into multiple functional elements: a metal mechanism element with slot, a ground element with protruding portions, and a feeding radiation element. Each segment serves a specific function in generating different frequency bands, enabling wideband operation while maintaining manageable structural complexity
Solution Approach 2:
The patent combines multiple antenna functions into a single integrated structure. The metal mechanism element, ground element, and feeding radiation element work together as a unified multiband antenna system, merging the functions of multiple frequency band generators into one compact antenna assembly
2Volume of moving object
If the antenna size is reduced for mobile devices, then the device portability is improved, but the bandwidth and radiation efficiency deteriorate
Solution Approach 1:
The antenna structure utilizes three-dimensional spatial arrangement of its elements. The ground element extends in multiple directions with protruding portions, and the feeding radiation element is positioned at specific heights above the ground plane, creating effective radiating structures in three dimensions that achieve wide bandwidth from compact volume
Solution Approach 2:
The feeding radiation element is nested within or positioned in close proximity to the metal mechanism element's slot structure. This nested arrangement allows the smaller feeding element to be integrated within the larger metal element's electromagnetic field, achieving multiple frequency bands from overlapping resonant structures
3Adaptability or versatility
If a multiband antenna structure is implemented, then the frequency band coverage is improved, but the device complexity increases
Solution Approach 1:
The metal mechanism element with slot serves multiple functions: it acts as both a resonant structure for generating frequency bands and as a housing or structural component of the mobile device. The ground element with protruding portions simultaneously provides grounding, radiation, and impedance matching functions across multiple frequency bands
Solution Approach 2:
The ground element features asymmetric protruding portions that create different resonant paths for different frequency bands. The feeding radiation element has an asymmetric configuration relative to the ground element, enabling independent optimization of multiple frequency bands without requiring symmetric complex structures
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 achieves wideband operation across multiple frequency bands, including 2.4 GHz/5 GHz WLAN and 6E Wi-Fi, with improved radiation efficiency and impedance matching, suitable for mobile devices.
Implementation Method 1
The slot of the metal mechanism element is excited to generate a first frequency band and a second frequency band
Implementation Method 2
The feeding radiation element is excited to generate a third frequency band
Data Source
AI summary
An antenna structure includes a metal mechanism element, a ground element, a feeding radiation element, and a dielectric substrate. The metal mechanism element has a slot. The ground element is coupled to the metal mechanism element. The feeding radiation element has a feeding point. The feeding radiation element is coupled to the ground element. The dielectric substrate has a first surface and a second surface which are opposite to each other. The feeding radiation element is disposed on the first surface of the dielectric substrate. The second surface of the dielectric substrate is adjacent to the metal mechanism element. The slot of the metal mechanism element is excited to generate a first frequency band and a second frequency band. The feeding radiation element is excited to generate a third frequency band. The ground element further includes a first protruding portion and a second protruding portion.