An enhanced NFC antenna structure
By increasing the number of NFC antenna turns and width, and optimizing the use of card edge space, the problems of short sensing range and unstable signal of existing NFC card antennas have been solved, resulting in a significant improvement in sensing range and sensitivity.
Patent Information
- Application Number
- CN202521803894.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-03
- Estimated Expiration
- 2035-08-25
AI Technical Summary
Existing NFC card antennas have a short sensing range and unstable signals, especially when communicating with low-power devices.
The enhanced NFC antenna structure increases the number of antenna turns to 5, widens the antenna width to 0.35mm, and optimizes the use of card edge space. It uses copper or aluminum foil and the antenna is distributed in a ring shape.
The sensing range has been increased from 1.5 cm to 3.2 cm, and the sensitivity has been improved by more than 100%, demonstrating stronger sensing performance when communicating with low-power devices.
Smart Images
Figure CN224458580U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of near-field communication technology, specifically to an enhanced NFC antenna structure. Background Technology
[0002] Existing NFC card antennas typically consist of 2-3 coils of antenna with a width of about 0.2mm. Due to limitations in card size and manufacturing process, their sensing range is generally 1-2 cm. In practical applications, especially when communicating with low-power devices such as smartphones, there are problems such as short sensing distance and unstable signal. To address these issues, we propose an enhanced NFC antenna structure. Utility Model Content
[0003] The purpose of this invention is to provide an enhanced NFC antenna structure to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: an enhanced NFC antenna structure, comprising a flexible circuit board, an NFC chip, an antenna, and a card. The flexible circuit board is fixedly connected to the inner cavity of the card, and the NFC chip is fixedly connected to the surface of the flexible circuit board. A multi-turn closed antenna is provided on the surface of the card, and the antenna is connected to the NFC chip.
[0005] Preferably, the corners of the card are arc-shaped, and the distance between the outer side of the antenna and the outer side of the card is 0.5mm, which significantly improves the antenna sensing area.
[0006] Preferably, the antenna is arranged in a ring shape, with 5 turns and a width of 0.35 mm.
[0007] Preferably, the antenna is made of copper foil or aluminum foil, and the thickness of the antenna is 0.03mm-0.05mm.
[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0009] This invention increases the number of antenna turns from the conventional 2-3 turns to 5 turns, widens the antenna width from 0.2mm to 0.35mm, and increases the overall sensing area of the antenna from the original 2mm reduction in the card edge distance to only 0.5mm, maximizing the use of the card edge space and thus improving coupling efficiency. Under test conditions, the sensing range is increased from the original 1.5cm to 3.2cm, and the sensitivity is improved by more than 100%. Therefore, it exhibits stronger sensing performance when communicating with low-power devices, with significantly improved sensing range and sensitivity. It can be widely used in near-field communication scenarios such as access control, identity verification, and gift card activation. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model.
[0011] In the diagram: 1. Flexible circuit board; 2. NFC chip; 3. Antenna; 4. Card. Detailed Implementation
[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0013] The flexible circuit board 1, NFC chip 2, antenna 3 and card 4 components in this application are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.
[0014] Please see Figure 1 An enhanced NFC antenna structure includes a flexible circuit board 1, an NFC chip 2, an antenna 3, and a card 4. The flexible circuit board 1 is fixedly connected to the inner cavity of the card 4, and the NFC chip 2 is fixedly connected to the surface of the flexible circuit board 1. The surface of the card 4 is provided with a multi-turn closed antenna 3, and the antenna 3 is connected to the NFC chip 2. The number of turns of the antenna 3 is increased from the conventional 2-3 turns to 5 turns, the width of the antenna 3 is increased from 0.2mm to 0.35mm, and the overall sensing area of the antenna 3 is increased from the original 2mm reduction in the card edge distance to only 0.5mm, maximizing the use of the card edge space, thereby improving coupling efficiency. The sensing range is increased from the original 1.5cm to 3.2cm in the test environment, and the sensitivity is improved by more than 100%. Therefore, it exhibits stronger sensing performance when communicating with low-power devices, with significantly improved sensing range and sensitivity. It can be widely used in near-field communication scenarios such as access control identification, identity verification, and gift card activation.
[0015] The corners of card 4 are arc-shaped, and the distance between the outer side of antenna 3 and the outer side of card 4 is 0.5mm, which significantly improves the antenna sensing area. Antenna 3 is distributed in a ring shape, with 5 turns and a width of 0.35mm. Antenna 3 is made of copper foil or aluminum foil and has a thickness of 0.03mm-0.05mm.
[0016] The working principle of this application is as follows: the number of turns of antenna 3 is increased from the conventional 2-3 turns to 5 turns, the width of antenna 3 is increased from 0.2mm to 0.35mm, and the overall sensing area of antenna 3 is increased from the original 2mm reduction in the card edge distance to only 0.5mm, maximizing the use of the card edge space, thereby improving coupling efficiency. Under the test environment, the sensing range is increased from the original 1.5cm to 3.2cm, and the sensitivity is increased by more than 100%. Thus, when communicating with low-power devices, it exhibits stronger sensing performance, with significantly improved sensing range and sensitivity, and can be widely used in near-field communication scenarios such as access control recognition, identity verification, and gift card activation.
[0017] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An enhanced NFC antenna structure comprising a flexible circuit board (1), an NFC chip (2), an antenna (3) and a card (4), characterized in that: The card (4) has a flexible circuit board (1) fixedly connected to its inner cavity, and an NFC chip (2) fixedly connected to the surface of the flexible circuit board (1). The card (4) has a multi-turn closed antenna (3) on its surface, and the antenna (3) is connected to the NFC chip (2).
2. The enhanced NFC antenna structure according to claim 1, wherein: The corners of the card (4) are arc-shaped, and the distance between the outer side of the antenna (3) and the outer side of the card (4) is 0.5mm, which significantly improves the antenna sensing area.
3. The enhanced NFC antenna structure of claim 1, wherein: The antenna (3) is arranged in a ring shape, with 5 turns and a width of 0.35 mm.
4. The enhanced NFC antenna structure of claim 1, wherein: The antenna (3) is made of copper foil or aluminum foil, and the thickness of the antenna (3) is 0.03mm-0.05mm.