Overlapping Plate Antenna Layout for Metal-Proximate Radiation Efficiency
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Solution Overview
Problem
Conventional antennas experience a reduction in radiation efficiency due to the presence of metal in their vicinity, which affects their performance in wireless communication devices.
Innovation Solution
The antenna apparatus includes a ground substrate, a feeding point, a first conductor device with a plate shape connected to the feeding point, and a second conductor device with a plate shape connected to the ground substrate, where the width of the first conductor device is wider than the second conductor device, and both are arranged to overlap, allowing for improved current distribution and reduced heat loss, thereby enhancing radiation efficiency even when metal is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional antenna designs are used, then the structure is simple, but radiation efficiency decreases due to heat loss from current distribution
Solution Approach 1:
The antenna conductor is divided into multiple segments with different widths. The first conductor has a first width and the second conductor has a second width that is different from the first width. This segmentation allows optimization of current distribution across different sections, reducing heat loss and improving radiation efficiency without requiring a completely new antenna structure.
Solution Approach 2:
Different sections of the antenna conductor are given different local properties through varying widths. The first conductor section has a specific width optimized for its position, while the second conductor section has a different width optimized for its position. This local quality variation enables better current distribution and reduced heat loss in critical areas, improving overall radiation efficiency.
2Area of stationary object
If the ground pattern is downsized, then the antenna fits better in compact devices, but impedance adjustment becomes difficult
Solution Approach 1:
The antenna design incorporates adjustable impedance elements that can be tuned to achieve optimal impedance matching even with a reduced ground pattern. The variable width conductor sections provide dynamic adjustment capability, allowing the antenna to maintain proper impedance characteristics despite the smaller ground area constraint.
Solution Approach 2:
The conductor width is changed as a key parameter to achieve impedance adjustment. By varying the width of different conductor sections, the impedance characteristics can be optimized for a downsized ground pattern, maintaining manufacturing precision and performance despite the reduced area.
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 effectively suppresses the decline in radiation efficiency and can further improve it, even in the presence of metal, by optimizing current flow and minimizing heat loss, resulting in better performance for wireless communication devices.
Implementation Method 1
an antenna apparatus... a first conductor device... a second conductor device... connecting portion which electrically connects another end of the first conductor device and another end of the second conductor device to each other
Data Source
AI summary
An antenna apparatus includes a ground substrate, a feeding point provided on the ground substrate, a first conductor device of which one end is electrically connected to the feeding point and which has a plate shape being parallel to the ground substrate, a second conductor device which is arranged between the first conductor device and the ground substrate, of which one end is electrically connected to the ground substrate, and which has a plate shape being parallel to the ground substrate and a connecting portion which electrically connects another end of the first conductor device and another end of the second conductor device to each other. A width of the first conductor device is wider than a width of the second conductor device. Lengths of the first conductor device and the second conductor device are ½ of a wavelength of a radio wave for operating the antenna apparatus.