Cavity Filter Assembly With Integrated EMC Shielding
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Solution Overview
Problem
Traditional base station (BS) designs face challenges in achieving compact size, reduced weight, and low assembly complexity due to separate radio and antenna units, metal components increasing weight, and complex structures leading to high costs and electromagnetic interference issues.
Innovation Solution
Integration of a cavity filter with a metalized plastic base portion and integrated EMC cover, along with plastic plating to form metal patterns for RF performance, reducing weight and size while improving EMC performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal materials are used for EMC cover and filter components, then electromagnetic shielding performance is improved, but weight increases
Solution Approach 1:
The patent employs composite material construction where plastic base portions are combined with metal plating layers. The filter chassis part and filter cover part use plastic as the base material and apply metal plating only on specific surfaces that require electromagnetic shielding, creating a composite structure that achieves EMC performance while minimizing weight compared to fully metal construction.
Solution Approach 2:
Instead of using metal materials throughout the entire EMC cover and filter structure, the patent applies metal plating only on specific local surfaces where electromagnetic shielding is required. The metalized outer-side surface of the filter chassis part or filter cover part provides targeted shielding, while other areas use lighter plastic material, optimizing the weight-shielding performance trade-off.
2Adaptability or versatility
If traditional separate modules (FU, EMC cover, frame assembly) are used, then assembly flexibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the filter unit (FU) and the electromagnetic compatibility (EMC) cover into a single integrated component. The EMC cover is formed by metalizing the outer-side surface of either the filter chassis part or filter cover part, eliminating the need for separate EMC cover modules and reducing overall structural complexity while maintaining assembly flexibility.
3Reliability
If more components are involved during assembling, then component functionality is improved, but ease of manufacture worsens
Solution Approach 1:
The patent combines multiple components into fewer integrated parts. The filter unit integrates the filter chassis, filter cover, and EMC cover functionality into a single assembly operation. By forming the EMC cover through metalizing the outer surface of existing filter components, the patent reduces the number of separate parts that need to be assembled while maintaining all necessary functionalities.
4Adaptability or versatility
If separate AU, FU, and EMC cover components are used, then design flexibility is improved, but productivity decreases
Solution Approach 1:
The patent merges the antenna unit (AU), filter unit (FU), and EMC cover into a highly integrated antenna filter unit. The EMC cover is formed by metalizing the outer surface of the filter chassis or cover, and the antenna elements are integrated with the filter structure. This integration reduces the number of separate assembly operations and improves productivity while maintaining design flexibility through the modular integrated unit.
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 integrated design achieves reduced size, weight, and assembly cost, with improved PIM performance and EMC shielding, enabling high integration and efficient production.
Implementation Method 1
an outer-side surface of the filter chassis part or the filter cover part facing a radio board that is to be electrically coupled with the cavity filter is metalized in such a manner that a metal layer formed thereby is configured as an electromagnetic compatibility (EMC) cover for blocking the radio board from electromagnetic interference
Implementation Method 2
plastic plating to form metal patterns for RF performance
Data Source
AI summary
The present disclosure relates to a filter unit, including: a cavity filter including a hollow main body, with an inner-side surface of the main body defining a closed cavity for housing resonance elements, the main body is formed by joining a filter chassis part and a filter cover part covering the filter chassis part, wherein an outer-side surface of the filter chassis part or the filter cover part facing a radio board that is to be electrically coupled with the cavity filter is metalized in such a manner that a metal layer formed thereby is configured as an electromagnetic compatibility (EMC) cover for blocking the radio board from electromagnetic interference. Also, the present disclosure relates to an antenna filter unit including the above-said filter unit and a radio unit including the above-said filter unit or the antenna filter unit.