Multi-Element Antenna Structure for Dual-Band WLAN Operation
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Solution Overview
Problem
Designing a small-size, wideband antenna element that can effectively cover various wireless communication frequency bands, such as 2G, 3G, LTE, Wi-Fi, and Bluetooth, 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 dielectric substrate with multiple radiation elements and a ground plane, utilizing positive and negative feeding points, via elements, and reflectors to achieve dual-band operation covering low-frequency bands (2400 MHz to 2484 MHz) and high-frequency bands (5150 MHz to 5850 MHz), with optimized element sizes and configurations for impedance matching and frequency band operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional antenna designs are used, then the antenna can be simple in structure, but the bandwidth is insufficient to cover multiple frequency bands
Solution Approach 1:
The antenna is divided into multiple independent radiation elements (first, second, third, fourth, fifth, and sixth radiation elements) with different geometries and orientations. Each element is optimized for specific frequency bands, allowing the antenna to cover a wide bandwidth from 700 MHz to 5.8 GHz by activating appropriate elements for different bands.
Solution Approach 2:
The antenna structure utilizes three-dimensional space by placing radiation elements on both the front surface and back surface of the dielectric substrate. This multi-layer configuration allows elements to be spatially separated while maintaining electrical connectivity through via holes, enabling wideband operation without excessive planar footprint.
2Adaptability or versatility
If multiple radiation elements are added to expand bandwidth, then the frequency coverage is improved, but the antenna size increases
Solution Approach 1:
Multiple radiation elements are integrated onto a single dielectric substrate with shared grounding structures and feeding networks. The elements are arranged to utilize available space efficiently, with some elements positioned on the front surface and others on the back surface, merging their functions into a compact unified structure.
Solution Approach 2:
The antenna employs a nested configuration where smaller radiation elements are positioned within the spatial envelope defined by larger elements. For example, the third and sixth radiation elements on the back surface are arranged to complement the front surface elements, creating a nested multi-layer structure that maximizes space utilization.
3Area of stationary object
If the antenna size is reduced for mobile devices, then the device portability is improved, but the radiation efficiency and bandwidth are degraded
Solution Approach 1:
The antenna utilizes a thin dielectric substrate to support multiple radiation elements in a compact form factor suitable for mobile devices. The dielectric layer provides electrical isolation and mechanical support while maintaining a low profile, enabling wideband operation in a space-constrained environment.
Solution Approach 2:
The antenna design incorporates adjustable feeding mechanisms and selectable radiation elements that can be dynamically activated based on the required frequency band. This dynamic configuration allows the small antenna to adapt its electrical characteristics to maintain radiation efficiency across different bands despite its compact physical size.
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 a wide bandwidth coverage, supports dual-band operation for WLAN 2.4 GHz/5 GHz, and provides omnidirectional or directional radiation patterns, suitable for small-size mobile communication devices with reduced size and low manufacturing costs.
Implementation Method 1
a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, and a sixth radiation element... The first radiation element has a first end and a second end, and is disposed on the upper surface of the dielectric substrate
Data Source
AI summary
An antenna structure includes a dielectric substrate, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, and a sixth radiation element. The dielectric substrate has an upper surface and a lower surface. The first radiation element, the second radiation element, the fourth radiation element, and the fifth radiation element are disposed on the upper surface of the dielectric substrate. The third radiation element and the sixth radiation element are disposed on the lower surface of the dielectric substrate. A positive feeding point is positioned at an end of the first radiation element. A negative feeding point is positioned at an end of the fourth radiation element. The third radiation element couples the first radiation element to the second radiation element. The sixth radiation element couples the fourth radiation element to the fifth radiation element.