Antenna Device With Segmented Conductive Base Plate
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Solution Overview
Problem
Metallic antennas integrated into electronic devices face challenges in maintaining antenna performance due to the conductive nature of the external material, which affects resonance frequency and radiation performance.
Innovation Solution
An antenna device featuring a conductive base plate with slits or penetration areas filled with nonconductive materials, along with a feeding part to supply current, optimizing the external conductive area for improved radiation and resonance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the entire external conductive area is used as an antenna, then the antenna area is maximized, but it is difficult to obtain a resonance frequency band
Solution Approach 1:
The external conductive area is segmented into multiple regions by dividing it into a first conductive area and a second conductive area with different impedance values. This segmentation allows each region to contribute differently to antenna operation, enabling both large area utilization and resonance frequency characteristics.
Solution Approach 2:
Different regions of the antenna are assigned different local properties through varying impedance values. The first conductive area has a first impedance value while the second conductive area has a second impedance value different from the first, creating local quality variations that enable resonance while maintaining large overall area.
2Reliability
If a portion of an external conductive area is used as an antenna, then resonance frequency band can be obtained, but it is difficult to ensure antenna performance
Solution Approach 1:
The antenna structure divides the conductive area into multiple segments with different impedance values, allowing the entire area to be utilized while maintaining resonance characteristics through the impedance variation between segments.
Solution Approach 2:
The antenna employs a composite structure with different conductive materials or treatments creating regions of different impedance values, analogous to composite materials principle, to achieve both large area utilization and resonance frequency performance.
3Strength
If most of the outer surface is formed of conductive material, then structural rigidity and design advantage are secured, but antenna performance is reduced
Solution Approach 1:
The conductive outer surface maintains structural rigidity while antenna performance is optimized by creating local quality variations through different impedance regions. The entire surface remains conductive for structural purposes, but specific regions are optimized for different antenna functions.
Solution Approach 2:
The conductive outer surface serves multiple functions simultaneously: it provides structural rigidity as a protective casing and also functions as the antenna element. By dividing it into different impedance areas, both structural and antenna functions are achieved without compromise.
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
Enhances antenna performance by maximizing the external conductive area while maintaining the structural integrity and design advantages of metallic materials, achieving multi-band or broadband characteristics.
Implementation Method 1
a feeding part configured to supply current to an inner area surrounded by the slit
Implementation Method 2
it is difficult to obtain a resonance frequency band
Implementation Method 3
a base plate of a conductive material including a penetration area, a radiator configured to be inserted into the penetration area and being spaced apart from the base plate
Data Source
AI summary
An antenna device is provided. The antenna device includes a base plate of a conductive material, at least one slit disposed in at least one area of the base plate and having a form in which a portion of a closed curve is open, and a feeding part configured to supply current to an inner area surrounded by the slit.