Printed Antenna Structure on Circuit Board for Compact Wireless Devices
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Solution Overview
Problem
Conventional antennas for small electronic devices, such as those in the 2.4GHz band, face challenges in size reduction and high costs when using multilayer ceramic materials, which also result in low radiation efficiency and reduced communication bandwidth.
Innovation Solution
A printed antenna structure on a circuit board with a ground surface, featuring a signal feed-in portion, first and second radiating units, and multiple printed layers, allowing for efficient signal transmission and parasitic capacitance, thereby reducing size and cost while enhancing bandwidth and radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional multilayer ceramic antenna is used, then the antenna structure is compact, but the cost is high and radiation efficiency is low
Solution Approach 1:
The patent replaces expensive multilayer ceramic antennas with a printed antenna structure using conventional circuit board materials and printing processes, significantly reducing manufacturing cost while maintaining compact size. The printed antenna achieves comparable or better performance at a fraction of the cost.
Solution Approach 2:
The patent substitutes the mechanical stacking of multiple ceramic layers with a printed circuit board approach where antenna elements are printed directly on the circuit board layers, eliminating complex ceramic assembly processes and reducing manufacturing complexity.
2Volume of moving object
If a conventional multilayer ceramic antenna is used, then the antenna structure is compact, but the radiation efficiency is low
Solution Approach 1:
The patent utilizes the third dimension by creating a three-dimensional printed antenna structure on multilayer circuit boards, with antenna elements extending across different layers and heights, achieving compact volume while maintaining effective radiation area and improving radiation efficiency.
Solution Approach 2:
The patent employs composite construction by integrating antenna elements from multiple printed layers with different materials and properties, creating a composite antenna structure that optimizes both compactness and radiation efficiency through material diversity.
3Volume of moving object
If the antenna size is reduced, then the electronic device size decreases, but the working bandwidth is reduced
Solution Approach 1:
The patent divides the antenna into multiple printed layers with different radiating elements on each layer, where each layer contributes to different frequency ranges. This segmentation allows the compact antenna to achieve broader overall bandwidth by combining the bandwidth contributions of individual layers.
Solution Approach 2:
The patent designs the printed antenna structure to serve multiple functions across different frequency bands, with the multilayer configuration enabling the antenna to operate effectively in both 2.4GHz and 5GHz bands, achieving universal compatibility despite reduced size.
4Ease of manufacture
If a printed antenna structure is used, then the manufacturing cost is reduced, but the structural complexity increases
Solution Approach 1:
The patent merges the antenna structure with the circuit board itself by printing antenna elements directly on the circuit board layers, eliminating the need for separate antenna components and assemblies. This integration simplifies the overall device structure despite the multi-layer printed antenna configuration.
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 significant reduction in size, lower costs, and improved radiation efficiency, with a usable bandwidth of 170MHz and efficiency above 70%, outperforming conventional multilayer ceramic antennas.
Implementation Method 1
a distance is formed between the fourth radiating element and the ground surface
Data Source
AI summary
An antenna structure includes a circuit board with a ground surface and a printed antenna. The printed antenna includes a signal feed-in portion, a first radiating unit connected to the signal feed-in portion and a second radiating unit connected to the first radiating unit and has a plurality of printed layers. The first radiating unit diverges and forms a first radiating element having a first turning portion and a second radiating element at a first end, and the first radiating element and the second radiating element are combined at a second end. The second radiating unit includes a third radiating element, a fourth radiating element, a second turning portion located between the third radiating element and the second end and a third turning portion located between the third radiating element and the fourth radiating element. A distance is formed between the fourth radiating element and the ground surface.