Metal Frame NFC Antenna for All-Metal Devices
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Solution Overview
Problem
The introduction of all-metal designs in consumer electronics poses challenges for near-field communication antennas due to metal shielding, leading to reduced radiation quality and increased costs, with conventional solutions requiring extra slits that compromise device integrity.
Innovation Solution
The use of a metal frame as a radiation body for NFC antennas, eliminating the need for FPC coils and ferrite, and offering flexible feeding methods such as direct feed, coupling feed, and aperture-coupled feed, which allows for shared electromagnetic radiation with microwave frequency antennas without additional slits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional FPC coil with ferrite is used for NFC antenna, then NFC function can be achieved, but device space is consumed and cost increases
Solution Approach 1:
The patent combines the NFC antenna function with the existing metal frame structure of the device. The metal frame serves dual purposes: as the structural support of the device and as the radiating element for NFC communication. This eliminates the need for separate FPC coils and ferrite components, thereby saving device space while maintaining NFC functionality.
Solution Approach 2:
The metal frame is designed to perform multiple functions simultaneously: it provides structural support for the device, acts as the NFC antenna radiating element, and can be integrated with the rear camera hole design. This multi-functionality approach eliminates the need for dedicated NFC antenna components, reducing overall device volume.
2Reliability
If FPC coil with ferrite is used for NFC antenna, then NFC function can be achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the NFC antenna function with the existing metal frame manufacturing process. By using the metal frame as the NFC antenna, the device eliminates the need to purchase and assemble separate FPC coils and ferrite components, thereby reducing material costs and simplifying the manufacturing process.
Solution Approach 2:
The metal frame serves itself as the NFC antenna, eliminating the need for additional dedicated NFC components. The existing structural element performs the dual role of support and communication, reducing overall component count and manufacturing complexity.
3Reliability
If extra slit is opened on rear camera hole for NFC antenna, then NFC function can be achieved, but device shell integrity is compromised
Solution Approach 1:
The patent combines the NFC antenna radiation function with the existing metal frame structure around the rear camera hole. The metal frame itself serves as the radiating element, eliminating the need to create additional slits or openings in the shell. This maintains the aesthetic integrity and structural stability of the device while achieving NFC functionality.
4Shape
If all-metal design is used for device shell, then aesthetic quality and touch experience improve, but NFC antenna radiation quality deteriorates due to metal shielding
Solution Approach 1:
The patent converts the harmful metal shielding effect into a beneficial feature by using the metal frame itself as the NFC antenna radiating element. The metal structure that would normally block NFC signals is repurposed to generate and radiate the NFC electromagnetic field, thereby maintaining both the all-metal aesthetic design and the NFC radiation quality.
Solution Approach 2:
Instead of trying to prevent metal shielding by adding non-metallic components or openings, the patent inverts the approach by making the metal frame the active radiating element. The metal structure that was previously seen as an obstacle is transformed into the source of NFC radiation, solving both aesthetic and functional requirements.
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 approach reduces costs, conserves internal space, and enhances design flexibility, resulting in more integrated and aesthetically pleasing devices with improved NFC and microwave communication capabilities.
Implementation Method 1
Taking the periphery metal frame or metal housing of the devices as a radiation body of an NFC antenna
Data Source
AI summary
A Near field communication (NFC) antenna and circuit modules are provided for communication terminal devices with metal frame, which aims at simplifying the implementation of the NFC antenna, and especially facilitating the application of the NFC for the devices with rear metal housing. The rear metal housing of a terminal device may be divided into three sections by the gap, the first section is metal frame, the second section is metal back shell. The metal frame as the main NFC antenna radiator, and also can be used as other microwave frequency antenna radiator. The rear metal shell connected to the motherboard ground. The NFC circuit module can transmit the NFC signal to the metal frame through different feeding methods to realize the radiation function of the NFC antenna.