Capacitively Shielded Housing for Antenna Devices
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Solution Overview
Problem
Current mobile radio antenna designs require a large number of screws for assembly, leading to undefined contact points and tolerance deviations, which result in undesirable intermodulation and poor shielding against high-frequency interference due to gaps and irregularities between housing walls and cover parts.
Innovation Solution
A capacitively shielded housing design that uses insulating layers to create a capacitive coupling between the reflector housing and the shielding plate, eliminating the need for screws and ensuring parallel contact surfaces to prevent intermodulation and improve shielding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large number of screws are used to assemble the housing and shielding plate, then the shielding effectiveness is improved, but the manufacturing complexity and assembly time increase
Solution Approach 1:
The patent extracts the fastening function from the shielding assembly by removing the need for screws entirely. The shielding plate is retained solely by capacitive coupling through contact areas, eliminating mechanical fasteners while maintaining shielding effectiveness.
Solution Approach 2:
The patent replaces the mechanical screw-fastening system with an electrical field-based capacitive coupling system. The contact areas between the housing and shielding plate create capacitive coupling that provides both retention and shielding without mechanical connection.
2Reliability
If screws are used to fix the shielding plate, then the shielding is secured, but undefined contact points and tolerance deviations occur causing intermodulation
Solution Approach 1:
The patent removes the screw fastening mechanism entirely, eliminating the source of contact point variability and tolerance accumulation. The shielding plate is held in position through capacitive coupling alone, ensuring consistent contact without mechanical intervention.
Solution Approach 2:
The patent changes the retention mechanism from mechanical (screws creating point contacts) to electrical field-based (capacitive coupling across contact areas). This parameter change eliminates undefined contact points and tolerance deviations that cause intermodulation.
3Ease of manufacture
If press-fit nuts are used for assembly, then preliminary fixing points are created, but misalignments occur leading to poor contact conditions
Solution Approach 1:
The patent eliminates press-fit nuts and all intermediate fastening components. The shielding plate is retained directly through capacitive coupling between contact areas, removing multiple alignment-critical interfaces and their associated misalignment risks.
4Reliability
If galvanic contact is used between housing and shielding plate, then electrical connection is achieved, but surface damage and altered contact conditions occur
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the housing and shielding plate contact areas. This dielectric layer prevents direct galvanic contact and associated surface damage while maintaining capacitive coupling for both retention and shielding functionality.
5Object-affected harmful factors
If multiple screws are used to assemble components, then the shielding is secured, but assembly time and costs increase
Solution Approach 1:
The patent removes all screw fasteners from the assembly process. The shielding plate is installed and retained in a single operation through capacitive coupling alone, dramatically reducing assembly time and complexity while maintaining shielding effectiveness.
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 reduces the risk of intermodulation, enhances high-frequency shielding, and simplifies assembly by eliminating the need for screws, while allowing for precise alignment and force-fitted contact, thus improving the overall structure's performance and reducing assembly time and costs.
Implementation Method 1
corresponding contact areas or flanges of the housing and of the shielding plate are not galvanically contacted with one another in their contact area, but are capacitively coupled to one another by means of an insulating layer or insulating film
Data Source
Figure 1
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Figure 2b
AI summary
The invention relates to an improved capacitively shielded housing, in particular a capacitively shielded component housing for a mobile radio antenna, which is characterized, inter alia, by the following features: - comprising an electrically conductive component and/or reflector housing (16), the component and/or reflector housing (16) has an opening region (30), which is shielded with respect to HF radiation by a shielding cover or a shielding plate (31), the contact or anchoring cover segments (45) of the shielding cover or of the shielding plate (31) are arranged against the component and/or reflector housing (16) immediately adjacent to and in parallel with the contact or anchoring housing segments (122), an insulating layer (47) being interposed, and the planar contact or anchoring housing segments (122) and the planar contact or anchoring cover segments (45) are oriented parallel to or at angle to an insertion or mounting direction (E) and/or a central axis (Z) extending through the component and/or reflector housing (16), namely at an angle α according to the following condition: 0° < α < 90°.