Circular Metal Strip NFC Antenna for Secure High-Speed Communication
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Solution Overview
Problem
Existing NFC antennas are not suitable for high-speed short-range communications with low far-field radiation leakage due to their low operating frequency and narrow bandwidth, and they are not secure as they require increased transmission power, which leads to potential eavesdropping.
Innovation Solution
A circular metal strip antenna configuration on a substrate with a radio frequency resistor, allowing for stable signal intensity and reception quality without increasing transmission power, featuring circular polarization and low far-field radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If NFC antenna is used for short-range communication, then far-field radiation leakage is reduced, but operating frequency is low and bandwidth is narrow, preventing high-speed communication
Solution Approach 1:
The patent changes the geometric parameters of the antenna structure from traditional linear shapes to circular metal strips with specific dimensions (first circular metal strip with diameter D1, second circular metal strip with diameter D2). This structural parameter change enables the antenna to achieve both near-field operation (reducing far-field radiation) and higher operating frequencies (enabling high-speed communication) simultaneously.
2Reliability
If transmission power is increased to ensure signal intensity during rotation, then signal reception quality is maintained, but communication signals are leaked into surrounding environment and easily eavesdropped
Solution Approach 1:
The patent employs circularly polarized antennas that dynamically adapt to rotational motion. The circular polarization maintains consistent signal characteristics regardless of antenna orientation, eliminating the need to increase transmission power during rotation. This dynamic adaptation ensures reliable signal reception while maintaining low transmission power levels, thereby preventing signal leakage and eavesdropping.
3Object-affected harmful factors
If linearly polarized NFC antenna is used, then far-field radiation is low, but signal intensity changes drastically during rotational motion between antennas
Solution Approach 1:
The patent changes the polarization parameter from linear to circular by using circular metal strip structures. This parameter change makes the antenna radiation pattern omnidirectional in the azimuth plane, ensuring stable signal intensity during rotational motion while maintaining low far-field radiation characteristics.
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
Ensures secure and efficient high-speed short-range communication with low far-field radiation, maintaining signal quality during rotational motion and preventing signal leakage, thus enhancing communication safety and security.
Implementation Method 1
a second end connected to a second end of the radio frequency resistor
Data Source
AI summary
An antenna includes a substrate, a first circular metal strip disposed on a first surface of the substrate, and a second circular metal strip disposed on a second surface of the substrate. The first circular metal strip has a first end used as a feed end and a second end connected to a first end of a radio frequency resistor. The second circular metal strip has a first end used as a grounding terminal and a second end connected to a second end of the radio frequency resistor.