Single-sided PCB antenna design structure of automobile tire pressure monitoring system

Abstract

The utility model discloses a single-sided PCB antenna design structure of an automobile tire pressure monitoring system, which comprises a radio frequency emission board provided with a battery; the antenna plate is arranged on the upper side of the battery; wherein a wire rod with the wire width of 3.2 mm is arranged on the antenna plate, the wire rod is arranged in a Z shape, one end of the wire rod is connected with a first connecting piece, the first connecting piece is connected with a radio frequency module of a tire pressure chip on the radio frequency transmitting plate, and the other end of the wire rod is connected with a GND end of the radio frequency transmitting plate through a second connecting piece. Compared with the prior art, the tire pressure monitoring sensor solves the problem that an extra radio frequency emission chip is needed due to the fact that the antenna with the thickness of 3 mm and annular routing is low in radiation efficiency in an existing tire pressure monitoring sensor.

Description

Technical Field

[0001] This utility model relates to the field of automotive tire pressure monitoring technology, and in particular to a single-sided PCB antenna design structure for an automotive tire pressure monitoring system. Background Technology

[0002] Direct tire pressure monitoring systems (TPMS) use pressure sensors installed in each tire to directly measure tire pressure. A wireless transmitter (typically 433MHz or 315MHz) transmits the pressure information from inside the tire to a central receiver module, which then displays the tire pressure data. The TPMS automatically alerts the system when tire pressure is too low or there is a leak.

[0003] Existing tire pressure monitoring sensors use a 3mm thick antenna design and a 0.5mm wide loop trace, resulting in high overall impedance and low radiation efficiency. Therefore, to achieve the required transmission power, existing tire pressure monitoring sensors employ a dual-chip solution, with one tire pressure chip and one RF transmitter chip on the circuit board. Due to limited board space, the tire pressure chip and RF transmitter chip are located on opposite sides of the circuit board. This increases the unit cost by using an additional RF transmitter chip, requires double-sided component placement, complicates circuit design, and increases PCB area. Furthermore, the RF frequency output by the transmitter chip can only be adjusted via hardware, limiting design flexibility. Additionally, since tire pressure monitoring sensors are powered by button batteries, the dual-chip design leads to high operating current and a short design lifespan.

[0004] In addition, the antenna uses a standard PCB thickness of 3mm, which results in higher costs. Utility Model Content

[0005] The purpose of this invention is to provide a single-sided PCB antenna design structure for an automotive tire pressure monitoring system, in order to solve the problem that the low radiation efficiency of the 3mm thick, loop-shaped antenna in existing tire pressure monitoring sensors necessitates an additional radio frequency transmitting chip.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a single-sided PCB antenna design structure for an automotive tire pressure monitoring system, comprising:

[0007] Radio frequency transmitter board, on which a battery is mounted;

[0008] Antenna plate, which is located on the upper side of the battery;

[0009] The antenna board is equipped with a 3.2mm wide wire in a "Z" shaped routing. One end of the wire is connected to the first connecting piece, which is connected to the proprietary RF module of the tire pressure chip on the RF transmitter board. The other end of the wire is connected to the GND terminal of the RF transmitter board via the second connecting piece.

[0010] As a further description of the above technical solution:

[0011] The first connecting piece and the second connecting piece are located on opposite sides of the antenna board.

[0012] As a further description of the above technical solution:

[0013] The first connecting piece has a first bending section.

[0014] As a further description of the above technical solution:

[0015] The second connecting piece is provided with a second bending section.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] 1. This utility model employs a 1.6mm thick FR-4 material PCB antenna with a 3.2mm linewidth design on the antenna board, making full use of the antenna board area, resulting in low overall impedance. Furthermore, the grounding design improves RF radiation efficiency. The same sensor hardware can simultaneously support 433MHz and 315MHz while ensuring the transmission strength of the RF transmission power. Therefore, the dedicated RF transmitter chip on the circuit board can be eliminated, reducing the product's operating current, increasing the product's design life, and simultaneously reducing the thickness of the PCB antenna.

[0018] 2. In this utility model, the original 3mm thick antenna uses a single connecting piece to connect to the RF transmitter board, that is, one end of the antenna is connected to the RF transmitter board, and the other end is suspended. However, the 1.6mm antenna in this application uses a double connecting piece, one end is connected to the RF transmitter board through the first connecting piece, and the other end is reconnected to the RF transmitter board through the second connecting piece and connected to the system GND terminal, which improves the antenna installation stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a single-sided PCB antenna for an automotive tire pressure monitoring system. Figure 1 .

[0021] Figure 2 A schematic diagram of the structure of a single-sided PCB antenna for an automotive tire pressure monitoring system. Figure 2 .

[0022] Legend:

[0023] 1. Radio frequency transmitter board; 11. Battery; 2. Antenna board; 21. First connecting piece; 211. First bending part; 22. Second connecting piece; 3. Wire. Detailed Implementation

[0024] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] Please see Figure 1-2 This utility model provides a technical solution: a single-sided PCB antenna design structure for an automotive tire pressure monitoring system, comprising:

[0027] Radio frequency transmitter 1, on which a battery 11 is mounted;

[0028] Antenna plate 2 is disposed on the upper side of battery 11;

[0029] The antenna board 2 is provided with a 3.2mm wide wire 3. The wire 3 is arranged in a "Z" shape. One end of the wire 3 is connected to the first connecting piece 21, which is connected to the proprietary radio frequency module of the tire pressure chip on the radio frequency transmitter board 1. The other end of the wire 3 is connected to the GND terminal of the radio frequency transmitter board 1 through the second connecting piece 22.

[0030] Working Principle: Utilizing a 1.6mm thick FR-4 material PCB antenna with a 3.2mm linewidth design on antenna board 2, this design fully utilizes the antenna board area, resulting in low overall impedance. The grounding design improves RF radiation efficiency. Only a single tire pressure sensor chip is needed, eliminating the need for an additional RF chip, to achieve the original design's RF signal strength. This simplifies PCB design and reduces costs. The same sensor hardware can simultaneously support 433MHz and 315MHz while maintaining RF transmission power. Therefore, a dedicated RF transmitter chip on the circuit board can be eliminated, using the tire pressure sensor chip's built-in RF module to achieve RF transmission functionality. This reduces product operating current, extends product design life, and allows for a thinner PCB antenna.

[0031] Example 2

[0032] This embodiment further improves upon the above embodiments by implementing the following technical solution: the first connecting piece 21 and the second connecting piece 22 are disposed on opposite sides of the antenna plate 2. The original 3mm thick antenna used a single connecting piece to connect to the RF transmitter board, meaning one end of the antenna was connected to the RF transmitter board, while the other end remained suspended. In this application, the 1.6mm antenna uses a double connecting piece; one end is connected to the RF transmitter board via the first connecting piece, and the other end is reconnected to the RF transmitter board via the second connecting piece and connected to the system GND terminal, thus improving antenna installation stability.

[0033] Example 3

[0034] This embodiment further improves upon the above embodiment by providing the following technical solution: a first bending portion 211 is provided on the first connecting piece 21. The first bending portion 211 is used to avoid the battery 11 and at the same time improves the deformation resistance of the first connecting piece 21.

[0035] Similarly, the second connecting piece 22 is provided with a second bending part, which is used to avoid the battery 11 and at the same time improves the deformation resistance of the second connecting piece 22.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A single-sided PCB antenna design structure for an automotive tire pressure monitoring system, characterized in that, include: Radio frequency transmitter board, on which a battery is mounted; An antenna plate is disposed on the upper side of the battery; The antenna board is provided with a 3.2mm linewidth wire, which is arranged in a "Z" shape. One end of the wire is connected to a first connecting piece, which is connected to the proprietary radio frequency module of the tire pressure chip on the radio frequency transmitter board. The other end of the wire is connected to the GND terminal of the radio frequency transmitter board through a second connecting piece.

2. The single-sided PCB antenna design structure for an automotive tire pressure monitoring system according to claim 1, characterized in that, The first connecting piece and the second connecting piece are disposed on opposite sides of the antenna plate.

3. The single-sided PCB antenna design structure for an automotive tire pressure monitoring system according to claim 1, characterized in that, The first connecting piece is provided with a first bending portion.

4. The single-sided PCB antenna design structure for an automotive tire pressure monitoring system according to claim 1, characterized in that, The second connecting piece is provided with a second bending portion.

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