CN-122026060-A - Antenna structure of automobile tire pressure sensor

Abstract

The application relates to an antenna structure of an automobile tire pressure sensor, which comprises a radiation section, wherein the radiation section is of a spiral coil structure and is configured to be in a normal mode radiation mode at a working frequency, and an electric dipole radiation field and an equivalent magnetic dipole radiation field are simultaneously generated, and the phases of the two radiation components are the same. The application breaks through the limitation of single radiation mode of the traditional loop antenna, and by adopting the symmetrical helical dipole structure, the antenna can excite the electric dipole radiation and the equivalent magnetic dipole radiation simultaneously, and the two radiation components have the same phase and are overlapped in the far field and in phase, the radiation gain is obviously higher than that of the traditional loop antenna, compared with the traditional loop antenna, the radiation gain can be effectively improved, the reliability of TPMS signal transmission is greatly improved, and the packet loss rate is reduced.

Inventors

• GUO JUNCHAO
• LIAN XIAOLIN

Assignees

• 东风汽车集团股份有限公司

Dates

Publication Date

20260512

Application Date

20260224

Claims (10)

1. 1. An antenna structure of a tire pressure sensor for an automobile, comprising: And the radiation section is of a spiral coil structure and is configured to be in a normal mode radiation mode at the working frequency, and simultaneously generates an electric dipole radiation field and an equivalent magnetic dipole radiation field, and the phases of the two radiation components are the same.
2. 2. The antenna structure of a car tire pressure sensor according to claim 1, wherein the radiation section includes a first spiral section and a second spiral section, the first and second spiral sections being identical and symmetrically disposed about a midpoint of the radiation section.
3. 3. The antenna structure of a car tire pressure sensor of claim 2, further comprising a feed structure connected between the first and second spiral segments for transmitting radio frequency signals to the first and second spiral segments, the feed structure configured to symmetrically feed the first and second spiral segments.
4. 4. An antenna structure of a car tyre pressure sensor according to claim 3, characterized in that the feed structure comprises a feed line section, which is a parallel two-wire transmission line structure.
5. 5. The antenna structure of a car tire pressure sensor according to claim 1, wherein the ratio of the spiral diameter of the radiating section to the operating wavelength is less than 0.18.
6. 6. The antenna structure of the automobile tire pressure sensor according to claim 1, wherein the ratio of the height of the radiation section to the operating wavelength is 0.012-0.032.
7. 7. The antenna structure of an automobile tire pressure sensor according to claim 1, wherein the radiating section is 10-15 mm in height and 11-14 mm in diameter.
8. 8. The antenna structure of an automobile tire pressure sensor according to claim 1, wherein the number of turns of the radiating section is 8-12.
9. 9. The antenna structure of the automobile tire pressure sensor according to claim 1, wherein the spiral diameter of the radiating section is 0.5-1.0 mm.
10. 10. The antenna structure of claim 4, wherein the length of the feeder section is 35-42 mm, and the distance between two wires is 5-8 mm.

Description

Antenna structure of automobile tire pressure sensor Technical Field The invention relates to the technical field of tire pressure sensor antennas, in particular to an antenna structure of an automobile tire pressure sensor. Background With the rapid development of intelligent and networking technologies of automobiles, a vehicle-mounted wireless communication system is expanded from a single broadcast receiving function to multidimensional sensing, positioning, interaction and control fields. Accordingly, the variety of vehicle-mounted antennas is increasing, and currently, the vehicle-mounted antennas are widely deployed and comprise an AM/FM broadcast antenna, a keyless entry and start antenna, a cellular communication antenna (2G/3G/4G/5G), a satellite navigation antenna (GPS/Beidou/GLONASS), a Bluetooth antenna, a Wireless Local Area Network (WLAN) antenna, an Electronic Toll Collection (ETC) antenna, a Tire Pressure Monitoring System (TPMS) antenna and the like. The antenna system intensively coexists in the limited space of the whole vehicle, and the availability and reliability of the intelligent networking function are directly determined by the electromagnetic compatibility and the radiation performance of the antenna system. Tire Pressure Monitoring Systems (TPMS) have gradually become a legal mandatory deployment in the global primary automotive market as one of the vehicle's core safety systems. The function of the system is to monitor the pressure and temperature data in the tire in real time and send an early warning to the driver in abnormal state, thereby effectively preventing tire burst accident, reducing fuel consumption and prolonging the service life of the tire. The TPMS system generally consists of two parts, namely a transmitting end and a receiving end: the transmitting end is integrated in each tire and comprises a pressure/temperature sensor, a microcontroller, a radio frequency transmitting chip and a transmitting antenna. The transmitting end transmits the acquired data such as tire pressure, temperature and the like outwards through radio frequency signals (the typical working frequency is 315MHz or 433 MHz) in an intermittent working mode; The receiving end is arranged on the vehicle body and comprises a receiving antenna, a radio frequency receiving chip and a vehicle body domain controller. After the receiving end analyzes, checks and fuses the four-wheel transmitting signals, the tire pressure state information is sent to a combination instrument or a vehicle-mounted central control screen for display and alarm through a Controller Area Network (CAN). At present, a loop antenna structure is generally adopted by a TPMS transmitter antenna and is arranged in a metal rim, the antenna has the advantages of simple structure, low cost and easy integration, however, due to the influence of a vehicle metal body and a metal rim on electromagnetic wave shielding, reflection, coupling and the like, the radiation efficiency of the loop antenna in the rim environment is obviously reduced, the problems of signal packet loss, transmission interruption and the like are caused, and the reliability of a tire pressure monitoring function is seriously influenced, so that a TPMS transmitter antenna structure which can still keep high-efficiency radiation in the metal rim environment and is fully compatible with the manufacturing system of the conventional tire pressure sensor is needed in the field, and the reliability problems of signal packet loss, transmission interruption and the like caused by low antenna efficiency of a transmitting end are fundamentally solved. Disclosure of Invention The antenna structure of the tire pressure sensor can effectively reduce the problems of signal attenuation and packet loss caused by shielding of a metal hub and complex electromagnetic environment, and improves the reliability of TPMS signal transmission. In a first aspect, an embodiment of the present application provides an antenna structure of an automobile tire pressure sensor, including: And the radiation section is of a spiral coil structure and is configured to be in a normal mode radiation mode at the working frequency, and simultaneously generates an electric dipole radiation field and an equivalent magnetic dipole radiation field, and the phases of the two radiation components are the same. With reference to the first aspect, in one embodiment, the radiation section includes a first spiral section and a second spiral section, and the first spiral section and the second spiral section are identical and are symmetrically disposed with a midpoint of the radiation section as a center. With reference to the first aspect, in one embodiment, the device further comprises a feeding structure connected between the first and second spiral segments for transmitting radio frequency signals to the first and second spiral segments, the feeding structure being configured to symmetrically feed the first and sec