Multi-band Antenna Design Using Conductor Dimension Expressions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current multi-band antennas face challenges in efficiently adjusting frequency bands and maintaining performance across different wavelength ranges, particularly in quasi-microwave, centimeter wave, quasi-millimeter wave, and millimeter wave bands, due to limitations in antenna design and size optimization.
Innovation Solution
The design of a multi-band antenna with specific dimensions for radiation and ground conductors, including expressions for optimal distances between conductor sides, allows for independent adjustment of frequency bands by varying the sizes of the radiation and ground conductors, enabling efficient transmission and reception in multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to meet compact device requirements, then the antenna can be integrated into smaller devices, but the antenna performance and frequency band coverage deteriorate
Solution Approach 1:
The antenna is divided into multiple independent antenna units, each capable of operating in different frequency bands. Each antenna unit includes a radiation conductor and a ground conductor with specific dimensional relationships, allowing the overall antenna system to cover multiple frequency bands while maintaining compact size through modular segmentation.
Solution Approach 2:
The patent employs specific dimensional parameters for the radiation and ground conductors, where the distance between opposing sides of the radiation conductor (Lrf1) and ground conductor (Lg1) satisfy defined expressions involving the wavelength (λ1) and relative dielectric constant (εr1/2). By adjusting these parameters, the antenna can be optimized for different frequency bands while maintaining a compact form factor.
2Adaptability or versatility
If the antenna is designed to cover multiple frequency bands, then wireless communication versatility is improved, but the antenna design complexity and optimization difficulty increase
Solution Approach 1:
Each antenna unit is designed with universal characteristics that enable it to operate across multiple frequency bands. The radiation conductor and ground conductor configuration with specific dimensional relationships allows a single antenna unit structure to serve multiple frequency band requirements, reducing overall system complexity while achieving multi-band functionality.
Solution Approach 2:
The patent provides specific design expressions that relate the dimensions of radiation and ground conductors to the operating wavelength and dielectric properties. These parameter relationships enable systematic design and optimization across different frequency bands without requiring completely different antenna structures for each band, thereby managing design complexity.
3Reliability
If the distance between radiation and ground conductors is optimized for one frequency band, then performance in that band is improved, but performance in other frequency bands deteriorates
Solution Approach 1:
The antenna system is segmented into multiple antenna units, each optimized for specific frequency bands through controlled dimensional parameters. This segmentation allows different parts of the antenna system to handle different frequency bands independently, maintaining good return loss characteristics in each band while achieving overall multi-band coverage through the combination of units.
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 approach allows for effective transmission and reception in multiple frequency bands with improved return loss characteristics, enabling flexible and efficient wireless communication across various frequency ranges.
Implementation Method 1
a first ground conductor spaced apart from the first radiation conductor with a dielectric having a relative dielectric constant εr interposed therebetween
Data Source
AI summary
A multi-band antenna is capable of transmitting/receiving electromagnetic waves at least in a first wavelength band of a first center wavelength λ1 and a second wavelength band of a second center wavelength λ2, which is shorter than the first center wavelength λ1, the multi-band antenna including at least one antenna unit, wherein the at least one antenna unit includes: a first radiation conductor; and a first ground conductor spaced apart from the first radiation conductor with a dielectric having a relative dielectric constant εr interposed therebetween, wherein: the first radiation conductor and the first ground conductor each have a planar shape having a pair of opposing first sides; and a distance Lrf1 between the pair of opposing first sides of the first radiation conductor and a distance Lg1 between the pair of opposing sides of the first ground conductor satisfy expressions below:0.2λ1/εr1/2≤Lrf1≤0.7λ1/εr1/2; and0.7λ2/εr1/2≤Lg1≤1.75λ2/εr1/2.