Miniaturized high-gain automobile V2X antenna

Abstract

A miniaturized high-gain automobile V2X antenna disclosed by the present invention comprises a substrate, the substrate is provided with a feed network, a pi-type impedance matching circuit and at least one amplification structure, the amplification structure comprises a spiral spring, and two ends of the spiral spring are respectively provided with a first connection section and a second connection section which are overlapped with an axis. According to the miniaturized high-gain automobile V2X antenna, the spiral structure of the spiral spring is matched with the capacitive oscillator, so that the spiral inductance characteristic is counteracted, the resonance length is shortened, and the miniaturization effect of the antenna is achieved. Compared with the existing products in the market, the product has the advantages that the size of the oscillator is reduced through the capacitive oscillator, and the size of the cylinder is reduced.

Description

Technical Field

[0001] This invention belongs to the field of automotive V2X antenna technology, and more specifically, relates to a miniaturized high-gain automotive V2X antenna. Background Technology

[0002] With the development of intelligent connected vehicles, V2X (vehicle-to-everything) technology needs to achieve high-speed and stable communication in complex electromagnetic environments, placing stringent requirements on the miniaturization, high gain, and wide bandwidth characteristics of antennas. Traditional automotive V2X antennas mostly adopt whip-shaped or patch structures, which have the following problems: 1. Size limitation: The wavelength of traditional dipole antennas is positively correlated with their size, making it difficult to fit into the compact installation space of automobiles (such as rearview mirrors and roof shark fins). 2. Insufficient gain: Miniaturization reduces radiation efficiency, resulting in shorter communication distance and weakened anti-interference capability. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a miniaturized, high-gain automotive V2X antenna that solves the problems of large size and limited gain of existing whip or patch structures.

[0004] To achieve the above objectives, the present invention provides a miniaturized high-gain automotive V2X antenna, comprising: A substrate, wherein a power supply network, a π-type impedance matching circuit and at least one amplification structure are disposed on the substrate; The amplification structure includes a helical spring, with a first connecting section and a second connecting section coinciding with the axis at both ends of the helical spring. The first connecting section is used to connect to the substrate, and a capacitive oscillator is provided at the end of the second connecting section away from the helical spring.

[0005] Optionally, multiple amplification structures are connected axially in sequence.

[0006] Optionally, the power supply network includes a CPWG structure for guiding radio frequency signals to terminals or radio frequency cables.

[0007] Optionally, a metal reflective floor is provided at the lower end of the substrate.

[0008] Optionally, the π-type impedance matching circuit is connected to the substrate via a feed point.

[0009] Optionally, the impedance of the π-type impedance matching circuit is 50Ω.

[0010] Optionally, the helical springs of each of the amplification structures have the same helical direction to counteract the helical inductance characteristics and shorten the resonance length.

[0011] Optionally, the capacitive oscillator is a capacitive loading plate, which is circular and coaxially arranged with the helical spring.

[0012] Optionally, the helical radius of the helical spring is not greater than the radius of the capacitive loading plate.

[0013] Optionally, the substrate is an FR4 dielectric substrate.

[0014] This invention provides a miniaturized high-gain automotive V2X antenna, which has the following advantages: This miniaturized high-gain automotive V2X antenna achieves miniaturization by utilizing the helical structure of a helical spring in conjunction with a capacitive dipole to counteract the helical inductance characteristics and shorten the resonant length. Compared to existing products on the market, this product's advantage lies in reducing the dipole size and cylindrical dimensions through the use of a capacitive dipole.

[0015] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0017] Figure 1 A schematic diagram of the amplification structure of a miniaturized high-gain automotive V2X antenna according to an embodiment of the present invention is shown.

[0018] Figure 2 A schematic diagram of the substrate of a miniaturized high-gain automotive V2X antenna according to an embodiment of the present invention is shown.

[0019] Explanation of reference numerals in the attached figures: 1. Substrate; 2. Power supply network; 3. Impedance matching circuit; 4. Amplification structure; 41. Helical spring; 42. Capacitive oscillator. Detailed Implementation

[0020] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0021] like Figure 1-2 As shown, a miniaturized high-gain automotive V2X antenna includes: A substrate 1 is provided with a power supply network 2, a π-type impedance matching circuit 3 and at least one amplification structure 4. The amplification structure 4 includes a helical spring 41. The two ends of the helical spring 41 are respectively provided with a first connecting section and a second connecting section that coincide with the axis. The first connecting section is used to connect with the substrate 1, and the end of the second connecting section away from the helical spring 41 is provided with a capacitive oscillator 42.

[0022] Specifically, the spiral structure of the helical spring 41, combined with the capacitive vibrator 42, counteracts the spiral inductance characteristics, shortens the resonant length, and achieves antenna miniaturization. Compared to existing products on the market, the advantage of this product lies in reducing the size of the vibrator through the capacitive vibrator 42, thus reducing the size of the cylinder.

[0023] Furthermore, by replacing the capacitive oscillator 42 with different capacitance values ​​or adjusting the helical parameters, it can be flexibly adapted to different frequency band requirements, exhibiting strong compatibility.

[0024] In this embodiment, multiple amplification structures 4 are connected axially in sequence.

[0025] Specifically, the number of amplification structures 4 is designed according to communication requirements.

[0026] In this embodiment, the power supply network 2 includes a CPWG structure, which is used to guide radio frequency signals to terminals or radio frequency cables.

[0027] Specifically, CPWG microstrip line feeding is used to guide the radio frequency signal to the terminal or soldered radio frequency cable.

[0028] In this embodiment, a metal reflective ground plane is provided at the lower end of the substrate 1.

[0029] Specifically, the metal reflective ground provides a stable ground for the substrate 1, while reflecting the electromagnetic energy radiated downwards by the oscillator, concentrating the energy in the radiation area above the substrate 1, and isolating electromagnetic interference from below.

[0030] In this embodiment, the π-type impedance matching circuit 3 is connected to the substrate 1 through the feed point.

[0031] In this embodiment, the impedance of the π-type impedance matching circuit 3 is 50Ω.

[0032] In this embodiment, the spiral directions of the spiral springs 41 of each amplification structure 4 are consistent, which helps to counteract the spiral inductance characteristics and shorten the resonance length.

[0033] Specifically, the spiral directions of the spiral springs 41 in each amplification structure 4 are consistent to ensure stable cancellation of spiral inductance and avoid mutual interference.

[0034] In this embodiment, the capacitive oscillator 42 is a capacitive loading plate, which is circular and coaxially arranged with the helical spring 41.

[0035] Specifically, the capacitive oscillator 42 is a φ8mm metal disc with a thickness of 0.5mm.

[0036] In this embodiment, the helical radius of the helical spring 41 is not greater than the radius of the capacitive loading plate.

[0037] Specifically, the helical spring 41 is made of metal, with an outer diameter of φ4.8mm, a pitch of 2mm, 2-3 coils, and a wire diameter of φ0.4mm.

[0038] In this embodiment, substrate 1 is an FR4 dielectric substrate.

[0039] This embodiment describes the use of a miniaturized high-gain automotive V2X antenna, taking automotive applications as an example: The power supply network 2, π-type impedance matching circuit 3, and amplification structure 4 are integrated on an FR4 dielectric substrate. They can be placed in various locations such as fins, rearview mirrors, spoilers, and central rearview mirrors, allowing for flexible and diverse layouts and providing clear and stable communication. The communication gain is 2-3 times higher than traditional patch antennas after amplification by the three amplification structures 4.

[0040] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A miniaturized high-gain automotive V2X antenna, characterized in that, include: A substrate, wherein a power supply network, a π-type impedance matching circuit and at least one amplification structure are disposed on the substrate; The amplification structure includes a helical spring, with a first connecting section and a second connecting section coinciding with the axis at both ends of the helical spring. The first connecting section is used to connect to the substrate, and a capacitive oscillator is provided at the end of the second connecting section away from the helical spring.

2. The miniaturized high-gain automotive V2X antenna according to claim 1, characterized in that, Multiple amplification structures are connected axially in sequence.

3. The miniaturized high-gain automotive V2X antenna according to claim 1, characterized in that, The power supply network includes a CPWG structure, which is used to guide radio frequency signals to terminals or radio frequency cables.

4. The miniaturized high-gain automotive V2X antenna according to claim 1, characterized in that, A metal reflective floor is provided at the lower end of the substrate.

5. The miniaturized high-gain automotive V2X antenna according to claim 3, characterized in that, The π-type impedance matching circuit is connected to the substrate through a feed point.

6. The miniaturized high-gain automotive V2X antenna according to claim 5, characterized in that, The impedance of the π-type impedance matching circuit is 50Ω.

7. The miniaturized high-gain automotive V2X antenna according to claim 2, characterized in that, The spiral directions of the spiral springs in each of the aforementioned amplification structures are consistent, which helps to counteract the spiral inductance characteristics and shorten the resonance length.

8. The miniaturized high-gain automotive V2X antenna according to claim 1, characterized in that, The capacitive oscillator is a capacitive loading plate, which is circular and coaxially arranged with the helical spring.

9. The miniaturized high-gain automotive V2X antenna according to claim 8, characterized in that, The helical radius of the helical spring is not greater than the radius of the capacitive loading plate.

10. The miniaturized high-gain automotive V2X antenna according to claim 1, characterized in that, The substrate is an FR4 dielectric substrate.

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