Shielded FSS Antenna Layout for Feed Network Interference Isolation
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Solution Overview
Problem
The feed network component of an antenna-filter-antenna architecture causes interference to the other antenna disposed below the frequency selective surface (FSS), affecting its performance.
Innovation Solution
The FSS unit is designed with a radiation assembly, receiving assembly, and transmission assembly stacked and spaced apart, incorporating a feed network component and metal shielding members with cavities to shield electromagnetic waves and reduce interference, enhancing isolation between antenna arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the feed network component is disposed outside the FSS unit, then the structure is simpler and easier to manufacture, but the feed network component causes interference to the antenna disposed below the FSS unit, affecting its performance
Solution Approach 1:
The feed network component is extracted from the external position and integrated inside the FSS unit structure. This removes the harmful interference effect on the lower antenna while maintaining the component's essential function of feeding signals to the upper antenna array.
Solution Approach 2:
The feed network component is nested within the FSS unit structure, specifically placed in the space between the radiation assembly and receiving assembly. This nested arrangement allows the feed network component to be shielded by the FSS structure, preventing interference to the lower antenna while maintaining signal transmission functionality.
2Object-affected harmful factors
If the feed network component is placed inside the space between radiation assembly and receiving assembly, then interference to the lower antenna is reduced, but coupling between the feed network component and transmission assembly may affect signal transmission
Solution Approach 1:
The metal shielding member is designed with selective shielding properties - it shields the feed network component from the lower antenna while maintaining signal transmission paths. The shielding structure has localized openings or configurations that allow desired signal propagation while blocking harmful interference.
Solution Approach 2:
The metal shielding member acts as an intermediary between the feed network component and the transmission assembly. It mediates the electromagnetic field interactions, allowing controlled coupling for signal transmission while preventing unwanted coupling that would cause interference to the lower antenna.
3Object-affected harmful factors
If metal shielding member is used to shield feed network component and transmission assembly, then interference between them is reduced, but device complexity increases
Solution Approach 1:
The metal shielding member serves multiple functions simultaneously: it shields the feed network component from the lower antenna, provides structural support within the FSS unit, and guides electromagnetic field distribution. This multi-functionality reduces the need for additional separate shielding components, thereby limiting the increase in device complexity.
Solution Approach 2:
The shielding function is merged with the existing FSS unit structure rather than being added as a separate external component. The metal shielding member is integrated into the space between the radiation and receiving assemblies, combining shielding, support, and field management functions in a unified structure.
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 design minimizes interference between the feed network component and transmission assembly, improving radiation efficiency and reducing mutual interference between antenna arrays.
Implementation Method 1
the metal shielding member is configured to shield at least one of the transmission assembly and the feed network component
Implementation Method 2
the frequency selective surface may receive electromagnetic waves sent by one of the antennas, transmit an electromagnetic wave of a specific frequency in the received electromagnetic waves, and effectively filters out an electromagnetic wave of a frequency other than the frequency
Implementation Method 3
the transmission assembly is configured to transmit a signal received by the receiver to the radiator, so that the radiator radiates the received signal to the outside
Data Source
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AI summary
This application provides an FSS unit, an FSS, an antenna, a communication device, and a communication system. The FSS unit includes a radiation assembly, a receiving assembly, and a transmission assembly that are stacked and spaced apart. The radiation assembly includes a radiator and a first metal layer that are stacked and spaced apart. The receiving assembly includes a receiver and a second metal layer that are stacked and spaced apart. The first metal layer and the second metal layer are located between the radiator and the receiver. One end of the transmission assembly passes through the first metal layer to be electrically connected to the radiator, and the other end of the transmission assembly passes through the second metal layer to be electrically connected to the receiver. The transmission assembly transmits energy received by the receiver to the radiator. There is space between the radiation assembly and the receiving assembly. A metal shielding member and a feed network component are located in the space, the metal shielding member is configured to shield at least one of the transmission assembly and the feed network component, and a cavity of the metal shielding member is configured to place the transmission assembly or the feed network component. The FSS unit may resolve a problem that the feed network component causes interference to an antenna disposed below.