High Frequency Shielding Hood with Interlocking Flange
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Solution Overview
Problem
Existing high-frequency-tight housings and antenna sockets fail to provide adequate shielding due to poor connections between housing and cover parts, leading to stray electromagnetic radiation, and existing solutions like screw connections and sealing elements are either ineffective or difficult to disassemble.
Innovation Solution
A double-shielding system comprising a plate-shaped shielding cover connected to the housing interior and a shielding hood with a peripheral flange that covers the outside, featuring galvanic contact points and a design that increases contact force and prevents housing wall bulging, ensuring improved high-frequency shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screw or rivet connections are used to connect housing and cover parts, then mechanical strength is improved, but high-frequency shielding effectiveness deteriorates due to gaps and poor contacts
Solution Approach 1:
The connection system is segmented into multiple independent contact points (protrusions and recesses) distributed around the perimeter, rather than relying on a few heavy screw connections. This segmentation allows continuous electrical contact while maintaining mechanical strength through distributed loading.
Solution Approach 2:
The cover part is nested onto the housing part with protrusions fitting into recesses, creating an interlocking structure. The protrusions extend from the cover into recesses of the housing, ensuring continuous electrical contact and mechanical retention without gaps that would compromise shielding.
2Object-affected harmful factors
If sealing elements or contact strips are inserted to compensate for irregularities, then high-frequency shielding is improved, but device complexity increases
Solution Approach 1:
The sealing function and electrical contact function are merged into a single integrated structure. The protrusions and recesses simultaneously provide mechanical retention, electrical continuity, and compensation for surface irregularities, eliminating the need for separate sealing elements or contact strips.
Solution Approach 2:
The protrusion-recess structure is self-aligning and self-compensating. During assembly, the protrusions automatically find their way into the recesses, compensating for manufacturing tolerances and surface irregularities without requiring external adjustment or additional components.
3Strength
If fixed connections by soldering, pressing, or caulking are used, then connection strength is improved, but ease of repair deteriorates as connections cannot be released
Solution Approach 1:
The connection transitions from a static permanent bond (soldering, caulking) to a dynamic reversible interference fit. The protrusions fit into recesses with sufficient friction for strong connection during operation, but can be released by applying force in the opposite direction, enabling easy assembly and disassembly.
4Object-affected harmful factors
If contact tongues are bent concavely to achieve high-frequency tight shielding, then shielding effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
Instead of bending contact tongues concavely to match irregular surfaces, the invention inverts the approach by providing protrusions with defined geometry that fit into corresponding recesses. The precision is built into the molded or formed protrusion-recess pairs rather than requiring post-forming of flexible 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
The solution significantly enhances the shielding effectiveness of metal housings with a metal coating, applicable to various shapes, including non-box structures, by creating a strong press fit and maintaining contact over a large area, thus preventing electromagnetic radiation leakage.
Implementation Method 1
The shielding cover (11) is placed on the opening (1a) of the housing (1) to be shielded and is connected using conventional shielding measures to the housing inner wall (3e) with which it is in galvanic contact
Implementation Method 2
The shielding hood (15) increases the contact forces between the cover (11) and the housing walls (3)
Data Source
Figure 1~1a
Figure 2a~2b
Figure 3a~4
AI summary
An improved high-frequency-tight enclosure is characterized by the following features: - a shielding enclosure (1) with a housing opening (1a) to be shielded is provided; - a shielding hood (15) is also provided, which, in addition to a central hood section (15a), comprises wall, edge, or flange sections (15b) projecting transversely thereto; - the shielding hood (15) is placed on the housing opening (1a) with its wall, edge, or flange sections (15b) such that the wall, edge, or flange sections (15b) of the shielding hood (15) overlap the side walls (3) of the shielding enclosure (1) on their outer surface (103a); - the shielding cover (11) is electrically contacted with the shielding enclosure (1) on its inner surface; and - the shielding hood (15) overlapping the housing opening (1a) is connected with its inner wall surfaces (15d) on the inner surface of the wall, edge, or flange sections (15b) on its outer surface (103a). or flange sections (15b) are formed,electrically contacted with external contact surfaces (3'a) on the outside (103a) of the side walls (3, 3', 3").