Loop Antenna Magnetic Gain Element for TV Reception
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Solution Overview
Problem
Existing antennas for receiving horizontally polarized digital television signals, particularly in mobile environments, face challenges due to their large size, fragility, and inefficiency at higher frequencies, as they require magnetic field capture which is not effectively enhanced by traditional ferrite materials.
Innovation Solution
A high frequency magnetic field antenna system incorporating a loop antenna with a magnetic gain element made of a material with a relative permeability greater than one, positioned in the loop's aperture, to increase magnetic flux density and induce a higher output voltage, enabling wideband operation and isotropic reception in the azimuthal plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a loop antenna is used to capture the magnetic-field component of horizontally polarized electromagnetic waves, then reception reliability is improved, but the antenna size must be large which makes it difficult to mount and physically fragile
Solution Approach 1:
The magnetic gain element is positioned inside the loop antenna aperture, nesting one component within another. This allows the magnetic gain element to enhance the magnetic flux density within the loop area without increasing the overall antenna footprint, resolving the contradiction between reliable magnetic field capture and compact size.
Solution Approach 2:
The magnetic gain element changes the magnetic properties of the antenna system by providing high relative permeability material in the aperture region. This parameter change concentrates and enhances the magnetic flux density within the loop area, improving reception reliability without requiring a larger antenna structure.
2Reliability
If traditional ferrite materials are used in loop antennas, then magnetic field capture is enhanced at low frequencies, but effectiveness deteriorates at higher frequencies such as VHF and UHF bands
Solution Approach 1:
The patent employs composite material construction by combining the conductive loop antenna structure with a magnetic gain element made of high permeability material. This composite approach creates an antenna system that maintains effective magnetic field capture across VHF and UHF frequency ranges, overcoming the frequency limitations of traditional single-material ferrite loop antennas.
3Adaptability or versatility
If the loop antenna circumference is made electrically small for broadband reception, then operating frequency range is improved, but output voltage decreases
Solution Approach 1:
The magnetic gain element is positioned specifically in the aperture region of the loop antenna where the magnetic flux is concentrated. This local placement creates a region of high magnetic permeability exactly where needed, enhancing the magnetic flux density and induced voltage in the loop conductor without requiring a larger overall antenna structure, thus maintaining broadband characteristics while improving output power.
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 antenna system achieves efficient reception of digital television signals across VHF and UHF frequency bands with a smaller form factor, improved robustness, and reduced noise, suitable for mobile applications.
Implementation Method 1
the magnetic gain element configured to increase a magnetic flux density associated with a received magnetic-field component of an incident electromagnetic wave
Implementation Method 2
a loop output voltage induced in the loop antenna is based, at least in part, on the increased magnetic flux density
Data Source
AI summary
An antenna system including a loop antenna including a conductor; and a magnetic gain element positioned in an aperture defined by the loop antenna, the magnetic gain element including a magnetic material that has a relative permeability greater than one for an operating frequency range, the magnetic gain element configured to increase a magnetic flux density associated with a received magnetic-field component of an incident electromagnetic wave wherein a loop output voltage induced in the loop antenna is based, at least in part, on the increased magnetic flux density.