Multi-band Compound Loop Antenna Design
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Solution Overview
Problem
Existing antenna designs, particularly small loop antennas, suffer from low radiation efficiency and narrow bandwidth due to their physical constraints, limiting their effectiveness in modern telecommunication devices.
Innovation Solution
A multi-band compound loop antenna is developed, utilizing both transverse magnetic (TM) and transverse electric (TE) modes to enhance radiation efficiency and bandwidth, featuring a magnetic loop and electric field radiators positioned orthogonally to achieve circular polarization and independent frequency band tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the area of the loop antenna is reduced to decrease device size, then the device becomes more compact, but the radiation efficiency and energy transmission capability are reduced by approximately 3 dB for each halving of the area
Solution Approach 1:
The patent combines a magnetic loop antenna with an electric dipole antenna into a single compound antenna structure. The magnetic loop provides magnetic field radiation while the electric dipole provides electric field radiation, and their combination creates a compound antenna that achieves higher radiation efficiency than either component alone, thereby compensating for the efficiency loss that would normally occur when reducing antenna size.
Solution Approach 2:
The patent creates a composite antenna structure that integrates two different antenna types (magnetic loop and electric dipole) into one unified structure. This composite design allows the antenna to operate in both magnetic and electric modes simultaneously, achieving superior radiation efficiency and bandwidth performance that overcomes the limitations of small loop antennas.
2Volume of moving object
If the area of the loop antenna is reduced to decrease device size, then the device becomes more compact, but the bandwidth is reduced
Solution Approach 1:
By merging the magnetic loop antenna and electric dipole antenna into a compound structure, the patent achieves bandwidth expansion. The magnetic loop resonates at lower frequencies while the electric dipole resonates at higher frequencies, and their combined response creates a broader overall bandwidth that is not achievable with either antenna type alone, thus overcoming the bandwidth limitation of small loop antennas.
3Device complexity
If a simple loop antenna is used to reduce device complexity, then the structure is simpler, but the antenna cannot be used effectively as a transmitter due to primarily producing magnetic field
Solution Approach 1:
The patent merges a magnetic loop antenna (which produces primarily magnetic field) with an electric dipole antenna (which produces both electric and magnetic fields) into a compound antenna. This combination enables the antenna to radiate effectively in both transmit and receive modes, achieving full-duplex functionality while maintaining relatively simple structure. The electric dipole component specifically addresses the transmission limitation of simple loop antennas.
4Adaptability or versatility
If multiple separate antennas are used to cover multiple frequency bands, then each frequency band can be optimized, but the device complexity and space requirements increase
Solution Approach 1:
The patent designs a compound antenna that performs multiple functions within a single structure. The magnetic loop and electric dipole components can be independently tuned to operate at different frequency bands, allowing the single antenna to cover multiple frequency ranges (e.g., 2.4 GHz and 5.8 GHz) that would normally require separate antennas. This multi-functional design reduces both the number of antenna elements and the overall system complexity.
Solution Approach 2:
By combining multiple antenna functions into a single compound antenna structure, the patent eliminates the need for multiple separate antennas. The magnetic loop and electric dipole are integrated into one unified structure that can be fed by a single transmission line, reducing the complexity of feed networks, mounting structures, and spatial requirements compared to using multiple independent antennas.
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 multi-band compound loop antenna achieves higher radiation efficiency and bandwidth, enabling efficient signal transmission and reception across multiple frequency bands, improving performance in compact devices.
Implementation Method 1
At a particular frequency, the at least one electric field radiator in combination with various portions of the magnetic loop resonate and radiate an electric field at a first frequency band
Implementation Method 2
At yet another particular frequency, the at least one monopole in combination with various portions of the magnetic loop resonate and radiate an electric field at a second frequency band
Data Source
AI summary
Embodiments provide multi-band, compound loop antennas (multi-band antennas). Embodiments of the multi-band antennas produce signals at two or more frequency bands, with the two or more frequency bands capable of being adjusted and tuned independently of each other. Embodiments of a multi-band antenna are comprised of at least one electric field radiator and at least one monopole formed out of the magnetic loop. At a particular frequency, the at least one electric field radiator in combination with various portions of the magnetic loop resonate and radiate an electric field at a first frequency band. At yet another particular frequency, the at least one monopole in combination with various portions of the magnetic loop resonate and radiate an electric field at a second frequency band. The shape of the magnetic loop can be tuned to increase the radiation efficiency at particular frequency bands and enable the multi-band operation of antenna embodiments.