Circular Polarized Compound Loop Antenna Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna designs, particularly small loop antennas, suffer from low efficiency and narrow bandwidth due to their inability to effectively radiate and receive signals, limiting their performance in modern telecommunication devices.
Innovation Solution
The development of single-sided and multi-layered circular polarized, self-contained compound loop antennas that utilize two electric field radiators oriented orthogonally to each other, with a controlled electrical delay to ensure out-of-phase emission, enhancing efficiency and axial ratio.
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 significantly reduced
Solution Approach 1:
The antenna is divided into two orthogonal electric field radiators (first and second radiators) that are positioned at different orientations. Each radiator contributes to the overall radiation pattern, allowing the antenna to maintain efficient energy transmission despite reduced individual element sizes. The segmentation into orthogonal components enables the antenna to overcome the limitations of small loop areas.
Solution Approach 2:
The invention transitions from a traditional single-plane loop structure to a three-dimensional configuration with radiators oriented in orthogonal directions (x, y, and z axes). This dimensional expansion allows the antenna to achieve circular polarization and maintain radiation efficiency even when the physical footprint is reduced, effectively utilizing spatial dimensions to compensate for area limitations.
2Device complexity
If simple loop antenna structures are used to reduce device complexity, then manufacturing becomes easier, but the bandwidth and radiation efficiency are limited
Solution Approach 1:
The antenna structure is designed to simultaneously support multiple functions: it generates both electric and magnetic fields, operates in both transmit and receive modes, and achieves circular polarization. The orthogonal radiators configured with specific impedance values (50 ohms each) enable the antenna to function as a versatile compound antenna that exceeds the performance of simple loop structures while maintaining reasonable manufacturing complexity.
Solution Approach 2:
The invention employs a composite antenna structure combining multiple radiator elements with different orientations and impedance characteristics. By integrating first and second electric field radiators in orthogonal configurations and connecting them through transmission lines with specific characteristic impedances, the system creates a composite structure that achieves superior bandwidth and efficiency compared to homogeneous simple loop antennas.
3Volume of moving object
If small loop antennas are used to meet size constraints, then device integration is improved, but the axial ratio and signal quality deteriorate
Solution Approach 1:
The antenna employs an asymmetric configuration with orthogonal radiators positioned at specific locations and orientations rather than a symmetric loop structure. The first radiator is oriented along one axis while the second radiator is oriented orthogonally, creating an asymmetric current distribution that enables circular polarization and improves axial ratio performance in compact form factors.
Solution Approach 2:
The antenna design incorporates dynamic phase relationships between the orthogonal radiators, with the second radiator positioned to create a 90-degree phase difference relative to the first radiator. This dynamic phase configuration enables circular polarization and maintains stable axial ratio performance despite the reduced physical size of the antenna elements.
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
These antennas achieve higher efficiency and bandwidth, enabling effective signal transmission and reception in both transmit and receive modes, suitable for various frequency ranges and environments.
Implementation Method 1
a magnetic loop located on a plane and configured to generate a magnetic field
Implementation Method 2
a first electric field radiator located on the plane and configured to emit a first electric field orthogonal to the magnetic field
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
Embodiments provide single-sided and multi-layered circular polarized, self-contained, compound loop antennas (circular polarized CPL). Embodiments of the CPL antennas produce circular polarized signals by using two electric field radiators physically oriented orthogonal to each other, and by ensuring that the two electric field radiators are positioned such that an electrical delay between the two electric field radiators results in the two electric field radiators emitting their respective electric fields out of phase. Ensuring the proper electrical delay between the two electric field radiators also maintains high efficiency of the antenna and it improves the axial ratio of the antenna.