Metal Frame Loop Antenna Layout for Low-Band Space Constraints
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Solution Overview
Problem
The challenge of configuring multiple antennas in electronic devices, particularly in 5G devices, is the limited space and headroom available for antenna placement, which affects their performance and functionality.
Innovation Solution
An antenna structure is designed with a metal extension part integrated into the middle frame body, utilizing a loop antenna configuration that saves space for low-frequency antennas and allows for broadband coverage from 600 MHz to 960 MHz, with an efficiency of -5 dB to -8 dB, while maintaining isolation and reducing attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are configured to support 5G and carrier aggregation technologies, then communication modes and frequency bands are enhanced, but the available space and headroom for antennas are reduced
Solution Approach 1:
The patent combines the low-frequency antenna with the metal frame structure that is already present in the electronic device. The metal frame serves dual purposes: as a structural component and as the radiating element for the low-frequency antenna, thereby eliminating the need for a separate dedicated antenna structure
Solution Approach 2:
The metal frame is designed to serve multiple functions simultaneously: it provides structural support for the device, acts as a shield for electromagnetic interference, and functions as the active radiating element for low-frequency communication. This multi-functionality allows space optimization while maintaining all required communication capabilities
2Ease of manufacture
If antenna design areas are set on top and bottom areas of the electronic device, then antenna configuration is simplified, but the space for other components is limited
Solution Approach 1:
Instead of confining the antenna to traditional top or bottom planar positions, the patent utilizes the side surface of the device where the metal frame is located. This dimensional shift allows the antenna to occupy space that would otherwise be unused, freeing up top and bottom areas for other critical components
3Reliability
If the metal extension part is made larger to improve antenna performance, then broadband coverage is enhanced, but the space occupation increases
Solution Approach 1:
The patent achieves broadband coverage (600 MHz to 960 MHz) by optimizing the dimensional parameters of the metal extension part. Through precise control of length, width, and gap dimensions, the antenna resonates across a wide frequency range without requiring excessive physical size, maintaining a compact form factor
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 proposed antenna structure effectively utilizes limited space, ensuring optimal performance and reducing antenna attenuation, thereby meeting communication operator requirements and providing better space for other antennas.
Implementation Method 1
the metal extension part is configured to introduce a radio frequency signal into the metal extension part
Implementation Method 2
the metal extension part is electrically connected to the first main board through a first metal elastic piece, and the metal extension part is electrically connected to the second main board through a second metal elastic piece
Implementation Method 3
the second main board is provided with an antenna tuner configured to adjust a resonance of the metal extension part
Data Source
AI summary
An antenna structure includes a middle frame body. The middle frame body includes a main board and an embedded metal, the embedded metal includes a metal body part and a metal extension part, the metal main body part and the metal extension part are an integral structure, the main board includes a first main board and a second main board, the first main board is electrically connected to the metal extension part, the first main board is configured to introduce a radio frequency signal into the metal extension part, the second main board is electrically connected to the metal extension part, and the second main board is configured to ground the metal extension part.