NFC intelligent panel

Abstract

The utility model provides an NFC (Near Field Communication) intelligent panel which is provided with a key cover plate (1.1), a plastic middle frame (1.2), a PCB (Printed Circuit Board) (1.3), a metal bottom frame (1.4) and a plastic bottom frame (1.5) from top to bottom in sequence when the NFC intelligent panel is horizontally placed; the metal bottom frame (1.4) and the plastic bottom frame (1.5) are fixedly connected, the plastic middle frame (1.2) and the PCB (1.3) are arranged in the key cover plate (1.1), and the key cover plate (1.1) is matched with the metal bottom frame (1.4) and the plastic bottom frame (1.5) to be fixed in the panel; the PCB comprises a top solder mask layer, an upper copper foil layer provided with a first antenna layer, a prepreg, a core plate, a hard plate and a prepreg from top to bottom; and an upper copper foil layer and a bottom solder mask layer of the first antenna layer are arranged.

Description

Technical Field

[0001] The utility model relates to the field of smart home control, and more particularly to an NFC signal transmission panel. Background Art

[0002] NFC (Near Field Communication) technology is rapidly developing. With the emergence of diverse and versatile NFC applications, NFC has become an essential part of our lives. While NFC technology has established a set of international standards for communication protocols, its antennas lack unified specifications. In practice, NFC antennas are typically designed based on the shape and size of the product. Traditional NFC antennas have significant limitations and limited performance. This paper addresses these issues and designs a novel NFC antenna structure that overcomes these limitations, effectively addresses the impact of partial metal shielding on NFC antenna layout, and improves NFC antenna performance. Utility Model Content

[0003] The utility model provides an NFC smart panel, which, when placed horizontally, comprises a key cover plate (1.1), a plastic middle frame (1.2), a PCB board (1.3), a metal bottom frame (1.4), and a plastic bottom frame (1.5) arranged in sequence from top to bottom;

[0004] The metal bottom frame (1.4) and the plastic bottom frame (1.5) are configured to be fixedly connected, and the plastic middle frame (1.2) and the PCB board (1.3) are placed inside the key cover (1.1) and fixed inside the panel by the key cover (1.1) in conjunction with the metal bottom frame (1.4) and the plastic bottom frame (1.5);

[0005] The PCB board includes the top solder mask layer from top to bottom, the upper copper foil layer where the first antenna is set,

[0006] Prepreg, core board, hard board, prepreg; set the upper copper foil layer and bottom solder mask layer of the first layer of antenna.

[0007] The PCB board includes a first-layer antenna (3.1), a second-layer antenna (3.2), an NFC antenna impedance matching circuit (3.3), and an NFC chip control circuit (3.4).

[0008] The NFC antenna impedance matching circuit (3.3) includes an antenna matching resistor (3.3.1) and an antenna matching capacitor (3.3.2).

[0009] The NFC chip control circuit (3.4) includes pull-up and pull-down resistors (3.4.1) on the NFC chip, a dual-interface NFC tag chip (3.4.2), and NFC chip filtering and energy storage capacitors (3.4.3). The NFC antenna signal (5.1) derived from the dual-interface NFC tag chip (3.4.2) is first connected to two filter capacitors and then to the NFC antenna through two series matching resistors.

[0010] The NFC antenna forms a closed loop.

[0011] The beneficial effects of this patent include:

[0012] 1) It can increase the antenna placement area and horizontally extend the length of the placed antenna, increasing the flexibility of NFC antenna layout;

[0013] 2) The antenna is placed on a double layer of copper foil (upper and lower copper foil) to appropriately reduce the interference of the metal parts in the panel structure design on the NFC antenna;

[0014] 3) Fixed antenna trace width requirement, increasing antenna signal strength when antennas are arranged in a small area;

[0015] 4) Adjust the impedance matching circuit to increase the antenna energy output. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0017] Figure 1 Structural explosion diagram of the utility model

[0018] Figure 2 PCB layout front

[0019] Figure 3 Back of PCB layout

[0020] Figure 3-1 NFC antenna impedance matching circuit

[0021] Figure 3-2 Dual-interface NFC chip control circuit

[0022] Figure 4 NFC chip control circuit

[0023] Figure 5 NFC antenna impedance matching circuit

[0024] Figure 6 First layer antenna

[0025] Figure 7 Second layer antenna

[0026] Reference numerals

[0027] 1.1 Button Cover

[0028] 1.2 Plastic middle frame

[0029] 1.3PCB board

[0030] 1.3.1 Buttons

[0031] 1.4 Metal bottom frame

[0032] 1.5 Plastic bottom frame

[0033] 2.1 First-layer antenna

[0034] 2.2 Impedance matching circuit connection hole

[0035] 2.3 First and second layer antenna connection holes

[0036] 3.1 Second Layer Antenna

[0037] 3.2 First and second layer antenna connection holes

[0038] 3.3NFC Antenna Impedance Matching Circuit

[0039] 3.3.1 Antenna matching resistance

[0040] 3.3.2 Antenna Matching Capacitor

[0041] 3.4NFC chip control circuit

[0042] 3.4.1 Pull-up and pull-down resistors on the NFC chip

[0043] 3.4.2 Dual-Interface NFC Tag Chip

[0044] 3.4.3NFC chip filtering and energy storage capacitors

[0045] 5.1NFC Antenna Signal

[0046] 6.1 Antenna Inner Ring

[0047] 6.2 Antenna Outer Ring

[0048] 7.1 Signal port 1

[0049] 7.2 Signal port 2

[0050] 7.3 Antenna Inner Ring

[0051] 7.4 Antenna Outer Ring DETAILED DESCRIPTION

[0052] The following is a further detailed explanation of this patent in conjunction with the drawings in the specification.

[0053] An NFC smart panel, when placed horizontally, is provided with a key cover plate (1.1), a plastic middle frame (1.2), a PCB board (1.3), a metal bottom frame (1.4), and a plastic bottom frame (1.5) in order from top to bottom;

[0054] The metal bottom frame (1.4) and the plastic bottom frame (1.5) are configured to be fixedly connected, and the plastic middle frame (1.2) and the PCB board (1.3) are placed inside the key cover (1.1) and fixed inside the panel by the key cover (1.1) in conjunction with the metal bottom frame (1.4) and the plastic bottom frame (1.5);

[0055] The PCB board includes, from top to bottom, a top solder resist layer, an upper copper foil layer for setting the first antenna layer, a prepreg, a core board, a hard board, and a prepreg; an upper copper foil layer for setting the first antenna layer, and a bottom solder resist layer.

[0056] The PCB board includes a first-layer antenna (3.1), a second-layer antenna (3.2), an NFC antenna impedance matching circuit (3.3), and an NFC chip control circuit (3.4).

[0057] The NFC antenna impedance matching circuit (3.3) includes an antenna matching resistor (3.3.1) and an antenna matching capacitor (3.3.2), which are connected via the antenna signal.

[0058] The NFC chip control circuit (3.4) includes pull-up and pull-down resistors (3.4.1) on the NFC chip, a dual-interface NFC tag chip (3.4.2), and NFC chip filtering and energy storage capacitors (3.4.3).

[0059] like Figure 5 , the NFC antenna impedance matching circuit (3.3) is composed of the antenna matching resistor (3.3.1) and the antenna matching capacitor (3.3.2). The NFC antenna signal (5.1) derived from the dual-interface NFC tag chip (3.4.2) is first connected to two filter capacitors, and then connected to the NFC antenna through two series matching resistors. Among them, the pull-up and pull-down resistors (3.4.1) on the NFC chip pull up and pull down the level signal of the dual-interface NFC tag chip (3.4.2) pin, thereby changing the startup state and output state of the dual-interface NFC tag chip (3.4.2);

[0060] The energy storage capacitor (3.4.3) provides the dual-interface NFC tag chip (3.4.2) with the power required for normal operation and filters out high-frequency and low-frequency components of the power signal, so that the power signal input to the dual-interface NFC tag chip (3.4.2) is always in a stable state.

[0061] like Figure 6 , Figure 7 Combined with Figure 3-Figure 5 The NFC antenna area uses a single-mesh communication structure. The NFC antenna is actually a closed loop, running from the analog front-end circuit (not shown) inside the dual-interface NFC tag chip (3.4.2) through the NFC antenna impedance matching circuit (3.3) to signal port 1 (7.1) at 7.1 and outputting to the second-layer NFC antenna (3.2). It then winds one turn to form the outer antenna loop (7.4), another turn to form the inner antenna loop (7.3), passes through the connection hole of the second-layer antenna (3.2) to the first-layer antenna (2.1), winds one turn to form the inner antenna loop (6.1), another turn to form the outer antenna loop (6.2), then to the impedance matching circuit connection hole (2.2), through the hole to signal port 2 (7.2), flows through the impedance matching circuit (3.3) again, and finally returns to the analog front-end circuit inside the dual-interface NFC tag chip (3.4.2). During this antenna routing process, the antenna line width must be consistent, and no right or sharp angles should be used.

[0062] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An NFC smart panel, when placed horizontally, is provided with a key cover (1.1), a plastic middle frame (1.2), a PCB board (1.3), a metal bottom frame (1.4), and a plastic bottom frame (1.5) in order from top to bottom; The metal bottom frame (1.4) and the plastic bottom frame (1.5) are configured to be fixedly connected, and the plastic middle frame (1.2) and the PCB board (1.3) are placed inside the key cover (1.1) and fixed inside the panel by the key cover (1.1) in conjunction with the metal bottom frame (1.4) and the plastic bottom frame (1.5); Its characteristics are: The PCB board includes, from top to bottom, a top solder resist layer, an upper copper foil layer for setting the first antenna layer, a prepreg, a core board, a hard board, and a prepreg; an upper copper foil layer for setting the first antenna layer, and a bottom solder resist layer.

2. An NFC smart panel as claimed in claim 1, characterized in that: The PCB board includes a first-layer antenna (3.1), a second-layer antenna (3.2), an NFC antenna impedance matching circuit (3.3), and an NFC chip control circuit (3.4).

3. An NFC smart panel as claimed in claim 2, characterized in that: The NFC antenna impedance matching circuit (3.3) includes an antenna matching resistor (3.3.1) and an antenna matching capacitor (3.3.2).

4. An NFC smart panel as claimed in claim 3, characterized in that: The NFC chip control circuit (3.4) includes pull-up and pull-down resistors (3.4.1) on the NFC chip, a dual-interface NFC tag chip (3.4.2), and NFC chip filtering and energy storage capacitors (3.4.3). The NFC antenna signal (5.1) derived from the dual-interface NFC tag chip (3.4.2) is first connected to two filter capacitors and then to the NFC antenna through two series matching resistors.

5. An NFC smart panel as claimed in claim 4, characterized in that: The NFC antenna forms a closed loop.

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