Wideband Antenna Structure With Coupled Elements for Compact Mobile Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Designing a small-size, wideband antenna element that can effectively cover a range of frequency bands for mobile communication devices, such as 2G, 3G, LTE, and 5G systems, while maintaining communication quality is a critical challenge due to the limitations of existing antennas with insufficient bandwidth.
Innovation Solution
The proposed antenna structure includes a ground element, a feeding radiation element, a first and second radiation element, a coupling branch, an inductive element, and a dielectric substrate, all disposed on the same surface, with specific configurations and materials like metal materials and an FR4 substrate, which allows for wideband operation by covering low-frequency bands from 600 MHz to 960 MHz and high-frequency bands up to 6000 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antenna designs are used, then the antenna can be simple in structure, but the bandwidth is 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, enabling wideband operation through segmented functional distribution rather than a single monolithic structure.
Solution Approach 2:
The antenna structure transitions from planar configurations to three-dimensional spatial arrangements. Radiation elements are positioned at different heights above the ground plane and oriented in different directions, utilizing vertical and angular dimensions to achieve wideband performance without proportionally increasing footprint area.
2Volume of moving object
If the antenna size is reduced, then it becomes suitable for mobile devices, but the bandwidth and communication quality deteriorate
Solution Approach 1:
Shorter radiation elements are positioned within the spatial envelope defined by longer elements. The first, second, and third radiation elements are arranged such that they nest within each other's electromagnetic fields and physical spaces, allowing multiple functional elements to coexist in a compact volume without significant interference.
Solution Approach 2:
The antenna employs adjustable impedance matching networks and tunable coupling mechanisms that allow the electrical characteristics to be dynamically optimized for different frequency bands. This enables a compact physical structure to achieve wideband performance through dynamic electrical reconfiguration rather than requiring large fixed dimensions.
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 enables the antenna to achieve a wide operational bandwidth, optimize impedance matching, and maintain a compact size, suitable for various mobile communication devices, including smartphones and tablets, with improved communication quality across multiple frequency bands.
Implementation Method 1
an inductive element, and a dielectric substrate. The feeding radiation element has a feeding point. The first radiation element is coupled to the feeding radiation element. The second radiation element is coupled to the feeding radiation element
Implementation Method 2
The ground element, the feeding radiation element, the first radiation element, the second radiation element, the inductive element, and the first coupling branch are all disposed on the same surface of the dielectric substrate
Data Source
AI summary
An antenna structure includes a ground element, a feeding radiation element, a first radiation element, a second radiation element, a first coupling branch, an inductive element, and a dielectric substrate. The feeding radiation element has a feeding point. The first radiation element is coupled to the feeding radiation element. The second radiation element is coupled to the feeding radiation element. The second radiation element and the first radiation element substantially extend in opposite directions. The first coupling branch is coupled through the inductive element to a first grounding point on the ground element. The first coupling branch includes an elevated portion extending across the first radiation element. The ground element, the feeding radiation element, the first radiation element, the second radiation element, the inductive element, and the first coupling branch are disposed on the same surface of the dielectric substrate.