Metal Frame Loop Antenna for Communication Device
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Solution Overview
Problem
Conventional communication devices with metal housings face challenges in designing antennas that allow electromagnetic waves to penetrate without compromising the appearance of the metal structural components, as existing solutions like slots or dynamic metal loop antennas often ruin the aesthetic appeal.
Innovation Solution
A communication device with a metal frame featuring multiple parts and a non-conductive main body, where conductors connect the metal frame to signal and ground terminals on a printed circuit board, forming a loop antenna configuration that allows for electromagnetic wave penetration without visibly altering the metal structure's appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slots or dynamic metal loop antennas are used in metal housing, then antenna performance is improved, but appearance is ruined
Solution Approach 1:
The patent introduces a non-conductive layer as an intermediary between the metal frame and the antenna structure. This non-conductive layer allows the antenna to function effectively while preventing direct visual contact between the antenna components and the exterior metal surface, thus maintaining appearance while ensuring antenna performance
Solution Approach 2:
The antenna structure is nested within the metal frame assembly, with conductors and circuit blocks positioned inside the housing. The antenna components are concealed within the device body, allowing electromagnetic wave penetration through the metal frame without visible external modifications
2Strength
If metal frame is used for housing, then heat dissipation and strength are improved, but antenna design becomes difficult
Solution Approach 1:
The antenna system is segmented into distinct functional components: metal frame parts serving as antenna elements, separate conductor traces on circuit boards, discrete circuit blocks for signal processing, and isolated non-conductive layers for insulation. This segmentation allows each component to be optimized independently while maintaining overall antenna functionality within the metal housing
Solution Approach 2:
The metal frame serves multiple functions simultaneously: it provides structural strength and heat dissipation as a housing component, while also serving as an antenna element for electromagnetic radiation. The conductors and circuit blocks are designed to work with the metal frame to create a functional antenna system without requiring separate antenna structures
3Reliability
If conductors are added to connect metal frame to circuit board, then antenna functionality is achieved, but device complexity increases
Solution Approach 1:
The antenna conductors are merged with the existing circuit board trace layers and circuit block structures. The metal frame portions are directly integrated with conductor traces on the circuit boards, eliminating the need for separate antenna wires or additional connection components. This merging reduces overall device complexity while achieving antenna functionality
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
Enables effective communication functions like GPS and GSM without compromising the appearance of the metal housing, allowing for diverse design options while maintaining the benefits of metal housings such as light weight, heat dissipation, and impact resistance.
Implementation Method 1
the metal frame having a first part, a second part, a third part, and a fourth part... a first conductor connected between the first part of the metal frame and the signal terminal... a second conductor connected between the second part of the metal frame and the ground terminal... forming a loop antenna configuration that allows for electromagnetic wave penetration
Data Source
AI summary
An antenna of a communication device includes a metal frame, a metal back cover and a printed circuit board. The printed circuit board includes a first circuit block and a second circuit block electrically connected to the first circuit block. A first conductor is connected between a first part of the metal frame and a signal terminal of the first circuit block. A second conductor is connected between a second part of the metal frame and a ground terminal of the first circuit block. A third conductor is connected to a third part of the metal frame. A fourth conductor is connected to a ground terminal of the second circuit block, and at least one coupling gap is defined between the third conductor and the fourth conductor. A signal terminal of the second circuit block is electrically connected to a fourth part of the metal frame.