Common-Aperture Antenna Decoupling Resonator for Better Isolation
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Solution Overview
Problem
In common aperture antenna systems, the strong coupling between horizontal and vertical polarization antennas results in poor isolation, limiting the channel capacity and making it difficult to achieve miniaturization while maintaining effective isolation.
Innovation Solution
The integration of a decoupling resonator with a resonance frequency within the operating frequency band of the second antenna, connected to the first antenna, reduces coupling by interfering with the current flow and improving isolation between the antennas, allowing for miniaturization and enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If horizontal and vertical polarization antennas are vertically stacked in a common aperture manner, then the area occupied by the antenna system is reduced, but the isolation between the two antennas deteriorates
Solution Approach 1:
A decoupling resonator is introduced as an intermediary element between the horizontal and vertical polarization antennas. The resonator is connected to the horizontal polarization antenna and configured with a resonance frequency within the operating frequency band of the vertical polarization antenna, thereby mediating the electromagnetic interaction and reducing coupling between the two antennas while maintaining the compact common aperture structure
Solution Approach 2:
The decoupling resonator utilizes electromagnetic resonance (analogous to mechanical vibration) at a specific frequency within the operating band of the vertical antenna. By tuning the resonator's resonance frequency to match the vertical antenna's operating frequency, the resonator creates a counteracting electromagnetic field that interferes with and reduces the coupling current between the horizontally and vertically polarized antennas
2Productivity
If the number of antennas is increased to implement MIMO technology, then the channel capacity is improved, but the device size increases
Solution Approach 1:
The patent transitions from horizontal side-by-side antenna arrangement to vertical stacking in the third dimension. By stacking the horizontal and vertical polarization antennas vertically with a common aperture, the system achieves multi-antenna functionality without increasing the planar footprint, thereby enabling MIMO implementation in compact devices
Solution Approach 2:
The common aperture structure allows the same physical space to serve multiple antenna functions. The vertically stacked horizontal and vertical polarization antennas share a common radiating aperture, enabling dual-polarization MIMO operation from a single location, thus achieving multi-functionality in a compact form factor
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 solution effectively improves the isolation between horizontally and vertically stacked antennas, enhancing the channel capacity and enabling miniaturization of antenna systems while maintaining effective decoupling and radiation performance.
Implementation Method 1
A resonance frequency of the decoupling resonator is within an operating frequency band of the second antenna, to reduce coupling between the first antenna and the second antenna
Data Source
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AI summary
This application provides an antenna system and a wireless device, and pertains to the field of communications technologies. In this application, a decoupling resonator is connected to a first antenna, and a resonance frequency of the decoupling resonator is within an operating frequency band of a second antenna, so that the decoupling resonator can resonate within the operating frequency band of the second antenna. Therefore, for a current that is in the operating frequency band of the second antenna and that is generated by the first antenna, the decoupling resonator is a short circuit, so that the current that is in the operating frequency band of the second antenna and that is generated by the first antenna is more likely to flow to the decoupling resonator rather than the second antenna. A current between the first antenna and the second antenna is interfered, and therefore coupling between the first antenna and the second antenna is reduced, and isolation between the first antenna and the second antenna is improved.