Magnetic Composite Antenna for Bandwidth and Size Reduction
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Solution Overview
Problem
Existing low profile antennas, such as planar and patch antennas, are bandwidth-limited and unsuitable for low frequency applications due to their resonant nature and the properties of conductive materials used in aircraft surfaces, necessitating a solution for enhanced bandwidth and reduced size and weight for increased installation flexibility.
Innovation Solution
An electrically small low profile antenna is developed using a composite laminate with a magnetic material, featuring an aperture coupled antenna element with an inclusive slot and microstrip feed network, and a lower ground plane to minimize electrical behavior changes caused by conductive surfaces, allowing for efficient signal propagation and circular polarization with increased bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing planar antennas and patch antennas are used, then the antenna structure is simple and easy to manufacture, but the bandwidth is limited due to resonant nature
Solution Approach 1:
The patent employs a composite laminate structure consisting of magnetic material layers (providing high permeability for bandwidth enhancement), dielectric layers (for signal isolation and structural support), and conductive layers (for electromagnetic radiation). This multi-material composite approach enables the antenna to achieve enhanced bandwidth through magnetic resonance while maintaining a planar geometry that is relatively simple to manufacture using standard PCB and lamination techniques.
2Ease of manufacture
If conventional dielectric materials are used in patch antennas, then the manufacturing process is straightforward, but the bandwidth at lower frequencies is very small
Solution Approach 1:
The patent fundamentally changes the electromagnetic parameters of the antenna system by incorporating magnetic material with high permeability (μr = 55-65). This parameter change enables magnetic resonance operation at lower frequencies with significantly enhanced bandwidth compared to conventional dielectric-only patch antennas. The magnetic material allows the antenna to operate in a different resonance regime (magnetic dipole resonance) that provides broader bandwidth at lower frequency ranges while maintaining compatibility with standard manufacturing processes.
3Volume of moving object
If antenna size is reduced for low profile applications, then the antenna becomes more compact and suitable for aircraft surfaces, but the bandwidth and performance deteriorate
Solution Approach 1:
The patent uses a composite laminate structure with magnetic material layers (high permeability) combined with dielectric and conductive layers. The magnetic material enables the antenna to achieve enhanced bandwidth and improved performance in a compact form factor by utilizing magnetic resonance effects that are not dependent on large physical dimensions. This allows the antenna to maintain low profile characteristics while overcoming the typical bandwidth limitations of electrically small antennas.
4Strength
If conductive materials are used for aircraft surfaces, then the structural integrity and conductivity are improved, but the antenna behavior changes and performance is affected
Solution Approach 1:
The patent introduces dielectric layers as intermediary materials between the conductive aircraft surface and the antenna elements. These dielectric layers serve as isolation barriers that prevent direct interaction between the conductive aircraft surface and the antenna's electromagnetic fields, thereby stabilizing the antenna's electrical behavior. The dielectric material with appropriate permittivity (εr = 3.0-4.0) provides both mechanical support and electromagnetic decoupling, allowing the antenna to maintain consistent performance regardless of variations in the underlying conductive surface properties.
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
The solution provides a bandwidth-enhanced, low-profile antenna with reduced size and weight, capable of operating effectively across a broader frequency range while maintaining low air drag and visibility, suitable for applications in structural health monitoring and UAVs, with improved performance compared to existing antennas.
Implementation Method 1
a magnetic material, the magnetic material having a relative permeability of, for example, 55-65
Implementation Method 2
a conductor, extending through the composite laminate between the top surface and the bottom surface of the composite laminate, the conductor forming a microstrip feed extending from an antenna input to the antenna element
Implementation Method 3
the at least one antenna element comprises an antenna element portion and a slot
Data Source
AI summary
An electrically small low profile antenna is disclosed. The antenna comprises circuit board comprising a composite laminate, formed of a magnetic material and having at least one antenna element disposed on a top surface of the composite laminate, a conductive ground plane disposed on a bottom surface of the composite laminate, and a conductor, extending through the composite laminate between the top surface and the bottom surface of the composite laminate, the conductor forming a microstrip feed extending from an antenna input to the antenna element.