Capacitive-Coupled Antenna Assembly for Metal Frame Isolation
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Solution Overview
Problem
Antennas within electronic devices face performance degradation due to conductive structures outside the antenna housing, such as metal frames, which can interfere with signal communication and affect efficiency and isolation.
Innovation Solution
The antenna assembly includes a coupling element capacitively coupled to the metal frame through the antenna housing sidewall, allowing energy transfer via an electric field without a direct electrical connection, improving antenna performance characteristics like radiation efficiency and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal frame is used to enclose the antenna housing, then structural strength and device aesthetics are improved, but antenna radiation efficiency and signal isolation deteriorate due to electromagnetic interference
Solution Approach 1:
A coupling element is introduced as an intermediary between the antenna and the metal frame. This coupling element capacitively couples the antenna to the metal frame, allowing the metal frame to provide structural support while minimizing its detrimental electromagnetic interference with the antenna's radiation efficiency and signal isolation.
2Object-affected harmful factors
If a metal frame is used to enclose the antenna housing, then device protection and aesthetics are improved, but signal communication and antenna isolation deteriorate
Solution Approach 1:
The coupling element serves as a mediator that allows the metal frame to fulfill its protective function while preventing it from generating harmful electromagnetic interference. The capacitive coupling mechanism enables the metal frame to be electrically isolated from the antenna, thereby eliminating interference while maintaining structural protection.
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
Enhances antenna radiation efficiency and isolation, enabling effective wireless communication over multiple frequency bands including LTE, GPS, Bluetooth, and NFC, while minimizing interference.
Implementation Method 1
The coupling element is capacitively coupled to the metal frame through the sidewall of the antenna housing
Implementation Method 2
allowing energy transfer via an electric field without a direct electrical connection
Data Source
AI summary
An antenna assembly is provided. The antenna assembly includes an antenna housing having a sidewall, an exterior surface of the sidewall at least partially enclosed by a metal frame. The antenna assembly further includes an antenna positioned along an interior surface of the sidewall. The antenna includes one or more antenna elements operable to communicate over one or more frequency bands. The antenna further includes a coupling element connected to at least one antenna element of the one or more antenna elements. The coupling element is capacitively coupled to the metal frame through the sidewall of the antenna housing.