Antenna Device with Artificial Magnetic Conductor Harmonic Suppression
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Solution Overview
Problem
Existing antenna devices fail to effectively reduce the influence of harmonics while maintaining a frequency response for fundamental waves, leading to unwanted emission of wireless signals in harmonic frequency bands.
Innovation Solution
The antenna device incorporates an artificial magnetic conductor (AMC) with strategically placed openings and slits between the antenna conductors and ground conductors, which helps in reducing the emission of wireless signals in harmonic frequency bands by leaking harmonic components, thus maintaining a low VSWR in fundamental wave frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an artificial magnetic conductor is placed between the antenna conductor and ground conductor without openings, then the frequency response for fundamental waves is maintained, but the emission of wireless signals in harmonic frequency bands cannot be reduced
Solution Approach 1:
The artificial magnetic conductor is segmented by forming openings and slits in its structure. This segmentation allows different regions of the AMC to perform different functions: certain areas block harmonic frequencies while other areas maintain the frequency response for fundamental waves, thereby resolving the contradiction between reducing harmonic emissions and maintaining fundamental wave performance
Solution Approach 2:
The AMC is designed with non-uniform local properties through strategically placed openings and slits. Specific localized regions have different electromagnetic characteristics that enable selective frequency control - some areas are optimized for harmonic suppression while others maintain fundamental wave resonance, thus achieving both objectives simultaneously
2Object-affected harmful factors
If openings are added to the artificial magnetic conductor to leak harmonic components, then the emission of wireless signals in harmonic frequency bands is reduced, but the structural complexity increases
Solution Approach 1:
Rather than adding complex external filtering structures, the invention segments the AMC itself by incorporating openings and slits directly into it. This integrated segmentation approach reduces overall device complexity by combining the harmonic suppression function with the existing AMC structure, eliminating the need for separate harmonic filtering components
Solution Approach 2:
The AMC with openings and slits performs multiple functions simultaneously: it maintains the frequency response for fundamental waves while also suppressing harmonic emissions. This multi-functionality reduces device complexity by consolidating what would otherwise require separate components into a single unified structure
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 allows the antenna device to satisfactorily hinder the emission of wireless signals in second-order harmonic frequency bands while maintaining a low VSWR in fundamental wave frequency bands, ensuring efficient wireless signal transmission and reception.
Implementation Method 1
the artificial magnetic conductor... is disposed separately from the at least one antenna conductor and the at least one ground conductor. At least one of the artificial magnetic conductor and the at least one ground conductor includes at least one opening formed at a place substantially facing a distal-side end of the at least one antenna conductor... reducing influence of harmonics
Implementation Method 2
maintaining a low VSWR in fundamental wave frequency bands
Data Source
AI summary
An antenna device includes at least one antenna conductor, at least one ground conductor, and an artificial magnetic conductor that is located between the at least one antenna conductor and the at least one ground conductor and is disposed separately from the at least one antenna conductor and the at least one ground conductor. At least one of the artificial magnetic conductor and the at least one ground conductor includes at least one opening formed at a place substantially facing a distal-side end of the at least one antenna conductor, the distal-side end of the at least one antenna conductor being opposite a feeder-side end of the at least one antenna conductor.