Capacitive Antenna Structure Miniaturization
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Solution Overview
Problem
Traditional antennas face challenges in achieving a miniaturized design while maintaining effective reception and emission, as well as integrating into built-in devices, due to complexity in adjusting the ratio of major and minor axes and non-uniform line widths of planar antenna patterns.
Innovation Solution
A capacitive antenna structure is introduced, featuring a sheet-shaped capacitor that couples and excites energy by using a substrate with a radiating metal layer and a grounding metal layer, along with grooves and contacts to facilitate signal transmission and prevent shielding, simplifying the design and manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a planar antenna pattern is used on a substrate to achieve miniaturized design, then the antenna size is reduced, but the design complexity increases due to the need to adjust the ratio of major axis and minor axis as well as non-uniform line width
Solution Approach 1:
The patent changes the fundamental parameters of the antenna structure by introducing a capacitor element and transforming the planar pattern into a three-dimensional configuration with grooves and raised portions. This parameter change allows achieving miniaturization without the complex adjustments of axis ratios and line widths required in traditional planar designs
Solution Approach 2:
The patent transitions from a two-dimensional planar antenna pattern to a three-dimensional structure by adding grooves, raised portions, and capacitor elements that extend in the vertical dimension. This dimensional change enables compact design while simplifying the overall structure by eliminating the need for complex planar geometry adjustments
2Reliability
If an exposed type antenna structure is used to achieve good reception, then the reception performance is improved, but the antenna cannot be integrated into built-in design of compact devices
Solution Approach 1:
The patent embeds the antenna structure within the substrate by creating grooves and raised portions that allow the antenna elements to be nested within the substrate thickness. The capacitor is integrated between the front and rear surfaces, and the signal transmission line is routed through the substrate, achieving built-in design while maintaining reception performance
Solution Approach 2:
The patent uses the vertical dimension (thickness direction) to accommodate antenna elements and transmission lines that would otherwise require more horizontal space. By extending structures in the Z-direction through grooves and raised portions, the antenna achieves compact integration without compromising reception capability
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 solution enhances the reception and emission capabilities of antennas, making them easier to manufacture and integrate into compact devices by simplifying the antenna structure and improving energy coupling.
Implementation Method 1
a capacitor electrically connecting to the first and second contacts, and being opposite to the second groove of the front surface of the substrate
Data Source
AI summary
A capacitive antenna structure comprises a substrate and a sheet-shaped capacitor. The substrate has a radiating metal layer and a grounding metal layer thereon. The radiating metal layer has a first groove to expose the front surface of the substrate, the first groove having a signal feeding hole therein and having a second groove on the edge. The grounding metal layer has a third groove on the edge to expose the substrate, the third groove being opposite to the second groove, the third groove having a first contact and a second contact on two sides respectively to electrically connect to the capacitor. The third groove may connect to a fourth groove to expose the substrate, the fourth groove having a signal transmission line therein, and the signal transmission line having the signal feeding hole to connect a cable.