Feed Network Metal Interlayer for PIM Reduction
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Solution Overview
Problem
The complex and excessive metal connections in feed networks of multiband antennas lead to unstable passive intermodulation (PIM) interference, reducing the reliability and quality of wireless communication systems by decreasing the carrier-to-interference ratio (C/I) and received signal strength indication (RSSI).
Innovation Solution
A feed network design where at least two radio frequency transmission channels are separated by a single metal interlayer without using screws or rivets, allowing for complete or partial closure of channels except at signal transmission ends, and incorporating a metal object or dielectric part within the interlayer to facilitate information exchange and reduce PIM interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple metal interlayers with screw connections are used to separate radio frequency transmission channels, then channel separation is achieved, but passive intermodulation interference increases and reliability decreases
Solution Approach 1:
The patent removes the harmful screw connections and multiple metal interlayers from the system. Instead, it uses a single continuous metal interlayer that separates radio frequency transmission channels without requiring any mechanical fasteners, thereby eliminating the source of passive intermodulation interference while maintaining channel separation.
Solution Approach 2:
The patent merges multiple separate metal interlayers into a single continuous metal interlayer. This unified structure achieves the same channel separation function while eliminating the need for multiple connection points and screws, thereby reducing passive intermodulation interference and improving reliability.
2Device complexity
If complex metal connections are used in feed network, then structural stability is achieved, but device complexity increases and PIM index becomes unstable
Solution Approach 1:
The patent extracts and removes all screw connections and complex metal fastening structures from the feed network. The single continuous metal interlayer provides structural stability through its continuous geometry rather than through multiple discrete connections, thereby simplifying the overall structure while improving PIM index stability.
Solution Approach 2:
The patent changes the structural parameter from multiple discrete connected components to a single continuous component. This parameter change transforms the feed network from a complex assembly of multiple metal interlayers and screws into a simple, stable structure with fewer potential sources of passive intermodulation interference.
3Volume of moving object
If multiple metal interlayers and connection components are used, then channel separation is achieved, but antenna size increases
Solution Approach 1:
The patent combines multiple separate metal interlayers into a single continuous metal interlayer that performs the channel separation function. This merging reduces the overall antenna volume by eliminating redundant structures while maintaining effective separation between radio frequency transmission channels.
Solution Approach 2:
The patent removes unnecessary connection components and redundant metal interlayers from the antenna structure. The single continuous metal interlayer achieves channel separation without requiring additional space for multiple connections, thereby reducing the overall antenna size while maintaining separation effectiveness.
Data Source
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AI summary
Embodiments of the present invention provide a feed network and an antenna, The feed network includes at least two separate radio frequency transmission channels, characterized in that the at least two separate radio frequency transmission channels are separated by a single metal interlayer or by several metal interlayers being on the same plane, one physical surface of the single or several metal interlayer(s) faces one of the at least two separate radio frequency transmission channels, and the other physical surface of the single or several metal interlayer(s) faces another one of the at least two separate radio frequency transmission channels. In the present invention, the radio frequency transmission channels are separated by the metal interlayer without using any screw or rivet connection. Therefore, the passive intermodulation interference caused by the metal connection is reduced, which increases the reliability and stability of the antenna, and improves the mobile communication quality.