Bent Planar Antenna Layout for All-Metal Shell Radiation
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Solution Overview
Problem
Existing antenna designs face interference from metal objects, limiting their radiation efficiency and requiring complex manufacturing procedures when placed in all-metal environments, such as smart home appliances with metal components.
Innovation Solution
A planar inverted-F antenna (PIFA) made of LCP soft material is designed to be bent and positioned vertically within a metal shell, with a gap or slot for improved radiation, allowing the antenna to operate effectively without being affected by the metal environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-metal clearance area is reserved for the antenna to avoid metal interference, then the antenna radiation efficiency is improved, but the device complexity increases due to additional design constraints and manufacturing procedures
Solution Approach 1:
The patent extracts the antenna from the traditional horizontal plane design and repositions it to a vertical plane configuration. By taking out the antenna from the conventional PCB layout and integrating it directly onto the metal shell surface, the design eliminates the need for large non-metal clearance areas while maintaining radiation efficiency.
Solution Approach 2:
The patent transitions the antenna from a two-dimensional horizontal plane design to a three-dimensional vertical plane configuration. This dimensional change allows the antenna to be positioned on the metal shell surface, utilizing the vertical space and eliminating the need for complex non-metal clearance areas that would be required in traditional horizontal layouts.
2Reliability
If the antenna is designed in a vertical plane using additional three-dimensional conductive parts, then the antenna radiation ability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the antenna structure with the metal shell itself. The metal shell is divided into sections where one section serves dual purposes: as the housing structure and as the antenna radiating element. This integration eliminates the need for separate three-dimensional conductive parts while maintaining vertical plane radiation capabilities.
Solution Approach 2:
The patent makes the metal shell multi-functional by designing it to serve both as the protective housing and as the antenna. The metal shell sections are configured to provide both structural support and electromagnetic radiation functions, thereby eliminating the need for additional dedicated antenna components and simplifying manufacturing.
3Adaptability or versatility
If the antenna is placed close to metal components in smart home appliances, then the device integration is improved, but the antenna radiation efficiency deteriorates due to metal interference
Solution Approach 1:
The patent converts the harmful effect of metal components into a beneficial feature by using the metal shell itself as the antenna radiating element. Instead of treating metal as an interferer that requires clearance, the design utilizes the metal shell's conductive properties to create the antenna, thereby eliminating interference issues while improving integration.
Solution Approach 2:
The patent inverts the traditional approach by instead of placing the antenna away from metal components to avoid interference, it places the antenna directly on the metal shell and uses the metal as part of the antenna structure. This inversion transforms the problem of metal interference into a solution where metal becomes the radiating element.
Data Source
AI summary
An appressed antenna includes an antenna housing and a metal shell. The antenna housing comprising a housing and a planar antenna, where the planar antenna is bent with one part folded onto the inner surface of the housing and other part pressed onto the outer surface of the housing. The antenna housing is sleeve fitted to the metal shell with a gap between for the planar antenna to radiate. In this all-metal environment, the position of the antenna is close to the gap opening will increase radiation efficiency. By having at least a branch at the tail end of the appressed antenna, the appressed antenna can have a good return loss and antenna gain.