Notebook Antenna Bandwidth via PCB Impedance Matching
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Solution Overview
Problem
The compact space within notebooks limits the design of antennas, leading to insufficient bandwidth and reduced efficiency due to false resonance, which negatively impacts the performance of mobile communication antennas.
Innovation Solution
A metal antenna structure integrated with a printed circuit board and a radio frequency matched line, allowing for adjustable bandwidth and improved efficiency by reducing the negative impact of space constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to fit compact notebook space, then the notebook portability is improved, but the antenna bandwidth becomes insufficient and efficiency deteriorates due to false resonance
Solution Approach 1:
The patent combines the antenna with a printed circuit board (PCB) to form an integrated structure. The PCB serves dual purposes: as the mounting platform for the antenna elements and as an impedance matching network. This merging allows the antenna to maintain compact size while the PCB's transmission lines provide bandwidth extension through impedance transformation, resolving the contradiction between small volume and sufficient bandwidth.
Solution Approach 2:
The patent introduces an impedance matching network on the PCB as an intermediary element between the antenna and the feed point. This matching network, consisting of transmission lines with specific characteristic impedances, acts as a mediator to transform the antenna's input impedance to match the feed line impedance, thereby extending the operational bandwidth without increasing the antenna's physical size.
2Adaptability or versatility
If resonance adjustment is used to obtain broadband, then the bandwidth is increased, but the original highly efficient structure of the antenna is destroyed and efficiency becomes worse
Solution Approach 1:
The patent segments the impedance matching function from the antenna's radiating structure. The antenna elements maintain their original efficient radiating geometry, while the bandwidth extension is achieved through separate impedance matching circuits on the PCB. This segmentation allows the antenna structure to remain highly efficient while the matching network provides the necessary bandwidth extension without disrupting the radiating elements' optimal configuration.
Solution Approach 2:
The impedance matching network on the PCB serves as an intermediary that provides bandwidth extension without requiring resonance adjustment of the antenna elements themselves. By using transmission line transformations and impedance matching techniques in this intermediary network, the patent achieves broadband operation while preserving the original antenna structure's high efficiency.
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 integration of a printed circuit board with a radio frequency matched line enhances the antenna's bandwidth and efficiency, achieving better performance across various frequencies.
Implementation Method 1
a radio frequency matched line, the radio frequency matched line can be adjusted to get a desired bandwidth and can reduce the influence on the efficiency of the main body of the antenna by space
Data Source
AI summary
An antenna structure for a notebook comprising a main body of an antenna and a printed circuit board which is provided on the main body of the antenna and is electrically connected; and the printed circuit board is laid out thereon at least with a radio frequency matched line, the radio frequency matched line can be adjusted to get a desired bandwidth.