A broadband car navigation glass antenna

Abstract

The present invention relates to a broadband automotive navigation glass antenna, comprising: component one, component two, component three, component four, component five, and component six, which are arranged on automotive glass. The broadband automotive navigation glass antenna of the present invention integrates functional glass with antenna components, avoiding the problems of limited layout, crowded space, and unsightly appearance encountered by traditional antennas. While ensuring the inherent mechanical properties of automotive glass, it avoids vias, achieving ultra-wide impedance bandwidth and axial ratio bandwidth that cover many frequencies of satellite navigation positioning, greatly improving positioning accuracy. The antenna has good gain flatness and stable directional pattern characteristics, enabling the antenna to provide a stable signal within the frequency band, ensuring stable signal quality and being unaffected by frequency changes. Finally, a conformal broadband satellite navigation glass antenna with advantages such as a compact structure and a wide operating bandwidth is designed.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, in particular to a broadband automobile navigation glass antenna. Background Art

[0002] Amid the global automotive industry's "New Four Modernizations," the smart car industry has become a key driver of my country's automotive industry transformation and upgrading. Satellite navigation antennas play a crucial role in the positioning, navigation, and safe driving of smart cars. Currently, navigation antennas are often installed in the vehicle's center console or within a shark fin antenna on the outside. Antennas placed in the center console are susceptible to the effects of the metal body, leading to performance degradation. Navigation antennas placed within shark fins, integrated with other functional antennas, interact with each other, significantly distorting the navigation antenna's directional pattern.

[0003] Through the study of existing car navigation antennas, it is found that different navigation antennas have different problems:

[0004] 1) Traditional automotive shark fin antennas integrate antennas for MIMO-LTE, GPS, WLAN, and WAVE frequency bands. The GPS antenna uses a patch structure, placed on a square ceramic plate on a metal floor. Its operating bandwidth covers the 1.575 GHz band. However, because the GPS antenna and other functional antennas are compactly integrated within the shark fin, they interact, degrading the radiation pattern.

[0005] 2) The patch antenna structure with four square ring slots can cover an operating bandwidth of 1.565-1.655 GHz. However, the bandwidth of this antenna is too narrow, achieving only a single frequency. As navigation and positioning accuracy requirements become increasingly stringent, it cannot meet the needs of broadband navigation applications.

[0006] 3) In order to cover the 1.227 GHz and 1.575 GHz bands and ensure effective energy radiation, a coupled feeding method is used. A 10 mm air gap is placed between the upper and lower dielectric substrates, which cannot meet the design requirements of low-profile automotive glass.

[0007] 4) Using a proximity-coupled probe feed source, although the operating frequency band covers 1.164-1.239 GHz and 1.559-1.610 GHz, the antenna requires drilling for feeding and is not suitable for glass antenna design.

[0008] 5) A wide-slot square slot antenna using coplanar waveguide feed is printed on a 120mm square FR4 substrate. The antenna uses an L-shaped feed structure to provide two resonances at 0.8GHz and 1.4GHz. Rectangular branches are added to the diagonal positions of the square slot to generate circular polarization at a low frequency near 1GHz. Although this antenna is simple to fabricate, its operating bandwidth is narrow and cannot meet the requirements for high positioning accuracy. Summary of the Invention

[0009] Therefore, the technical problem to be solved by the present invention is to overcome the following problems in the prior art:

[0010] 1. Traditional automotive satellite navigation antennas, such as shark fin antennas placed outside the vehicle, are easily affected by the external environment and lack aesthetic appeal. Furthermore, the shark fin antenna houses antennas for various functions, such as MIMO-LTE, GPS, WLAN, and WAVE modules. These antennas are closely spaced and easily interfere with each other, degrading the performance of the GPS patch antenna.

[0011] 2. For patch satellite navigation antennas, the frequency bands they cover are usually single-band or dual-band, which cannot meet the requirements of broadband coverage. As the demand for navigation and positioning continues to increase, patch antennas cannot meet the requirements of high-precision navigation and positioning.

[0012] 3. To ensure effective radiation of energy, the coupled-fed navigation antenna requires a higher profile height, which does not meet the low profile requirements of automotive glass antennas.

[0013] 4. For the probe-fed navigation antenna, the probe feeding method not only destroys the stability of the glass structure, but also makes the overall structure complex and the manufacturing cost high.

[0014] 5. Common wide-slot coplanar waveguide navigation antennas typically utilize two resonant points to achieve broadband performance, resulting in a limited operating bandwidth. Both the impedance bandwidth and the axial ratio bandwidth struggle to simultaneously encompass multiple positioning frequencies. Furthermore, the antenna's gain flatness is poor, leading to unstable signal reception.

[0015] To solve the above technical problems, the present invention provides a broadband car navigation glass antenna, comprising: a first component, which serves as the base of the antenna, wherein a groove first is provided in the center of the first component, and a groove second is provided between the groove first and the edge of the first component, wherein the groove second serves as a feed port; a second component, which is a feed microstrip structure, wherein the cross section of the second component is in the shape of Γ, wherein one end of the second component is disposed in the groove second, and the other end of the second component is located in the groove first; and a third component, which is a patch structure for guiding current, wherein the cross section of the third component is in the shape of Γ, and the third component is located in the groove first, wherein one end of the third component and the corner portion of the second component located in the groove first are connected. The antenna is connected at a certain position; Component 4 is a coupling portion, and the cross-section of Component 4 is in the shape of Γ. Component 4 is located in groove 1; Component 5 is a grounding strip used to increase the path of current. The cross-section of Component 5 is in the shape of U. Component 5 is located in groove 1, and the two ends of the U-shaped Component 5 are connected to the inner wall of groove 1; Component 6 is a coupling branch, and Component 6 is provided in a plurality, and several Component 6 are arranged outside Component 1, and one end of Component 6 is connected to the outer wall of Component 1. Component 6 is used to adjust parameters to obtain the required broadband of the antenna; Component 1, Component 2, Component 3, Component 4, Component 5, and Component 6 are installed on the glass of the vehicle. The broadband vehicle navigation glass antenna of the present invention integrates the satellite navigation antenna with the vehicle sunroof glass, which not only meets people's demand for panoramic sunroofs in vehicles, but also saves space and improves the signal reception capability and anti-interference capability of the navigation antenna.

[0016] In one embodiment of the present invention, the component one is in the shape of a circular thin sheet, the groove one is arranged at the center position of the component one, and the cross-section of the groove one is rectangular, the four sides of the groove one are respectively divided into a first side, a second side, a third side and a fourth side, the groove two is arranged between the first side and the outer circumference of the component one, and the groove two is a rectangular groove, and the two ends of the component five are connected to the fourth side.

[0017] In one embodiment of the present invention, the first side is divided into two parts by groove 2, and the two parts of the first side are respectively opposite to one side of component 2 and one side of component 3. The part of the first side opposite to component 3 is provided with boss 1, and boss 1 protrudes toward the center of groove 1, and boss 1 is a rectangular boss.

[0018] In one embodiment of the present invention, the number of the components six is ​​8, and the 8 components six are grouped in pairs.

[0019] In one embodiment of the present invention, the component three includes component seven and component eight, both of which are rectangular branches, and the length of component eight is smaller than that of component seven. Component seven is arranged opposite to boss one, and component eight is arranged opposite to the second side.

[0020] In one embodiment of the present invention, one end of the component four is arranged opposite to the component eight, and the other end of the component four extends toward the third side and is arranged opposite to the third side.

[0021] In one embodiment of the present invention, an end of the component seven away from the first side forms a protruding step relative to an end of the component two away from the first side.

[0022] In one embodiment of the present invention, a gap is left between the fourth component and the eighth component.

[0023] In one embodiment of the present invention, the impedance bandwidth of the antenna is: 1.03 GHz-2.24 GHz, the axial ratio bandwidth is: 1.00 GHz-1.77 GHz, and the gain bandwidth above 3 dB is: 0.9 GHz-1.71 GHz.

[0024] In one embodiment of the present invention, the cross section of the component six is ​​rectangular.

[0025] The broadband car navigation glass antenna of the present invention has the following advantages compared with the prior art:

[0026] 1) Integrate functional glass with antenna components to avoid the layout constraints, space congestion, and unsightly appearance issues encountered with traditional antennas.

[0027] 2) While maintaining the inherent mechanical properties of automotive glass, the system avoids vias and achieves ultra-wide impedance bandwidth and axial ratio bandwidth, covering many frequencies of satellite navigation positioning and significantly improving positioning accuracy.

[0028] 3) The antenna has good gain flatness and a stable radiation pattern, which enables the antenna to provide a stable signal within the frequency band, ensuring the stability of the signal quality and being unaffected by frequency changes. Finally, a conformal broadband satellite navigation glass antenna with the advantages of compact structure and wide working bandwidth was designed.

[0029] The broadband car navigation glass antenna of the present invention:

[0030] 1) Currently, shark fin antennas are placed outside the vehicle, making them susceptible to environmental influences. Furthermore, the spacing between different functional antennas is small, making them susceptible to coupling interference. This invention proposes combining functional glass with satellite navigation antennas to address the issue of exposed antennas being easily damaged. This also fully utilizes the vehicle's large sunroof glass, ensuring stable navigation antenna performance.

[0031] 2) To address the problem that the operating frequency band of the patch navigation antenna covers a single frequency band or a dual frequency band and cannot achieve broadband performance, the present invention adopts a coplanar waveguide antenna design to achieve broadband performance;

[0032] 3) For coupled-feed multi-layer navigation antennas, there is a problem of high profile height. The present invention realizes effective energy radiation while ensuring a low profile by designing the feeding structure and the antenna radiation part on the same plane.

[0033] 4) For navigation antennas using probe feed, a via structure is required. This invention adopts a conformal design between the glass and the antenna, avoiding the need for drilling holes in the glass, ensuring the overall stability of the glass, and having a relatively simple structure.

[0034] 5) Existing wide-slot coplanar waveguide navigation antennas have a very limited bandwidth due to their two resonant points, making them unable to cover a wide range of positioning frequencies. This invention achieves wide-band performance by leveraging four resonant points, ensuring that the operating bandwidth covers a wide range of positioning frequencies and improving navigation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0036] Figure 1 This is a schematic structural diagram of a broadband car navigation glass antenna in a preferred embodiment of the present invention;

[0037] Figure 2 This is a dimensional diagram of a broadband car navigation glass antenna in a preferred embodiment of the present invention;

[0038] Figure 3 is a graph showing the antenna reflection coefficient characteristics in a preferred embodiment of the present invention;

[0039] Figure 4 is a graph showing the axial characteristics of the antenna in a preferred embodiment of the present invention;

[0040] Figure 5 is a graph showing antenna gain characteristics in a preferred embodiment of the present invention;

[0041] Figure 6 The two-dimensional radiation pattern of the antenna at 1.268 GHz in the preferred embodiment of the present invention;

[0042] Figure 7 The two-dimensional radiation pattern of the antenna at 1.575 GHz in the preferred embodiment of the present invention;

[0043] Figure 8 is a comparison diagram of the reflection coefficient characteristics in a preferred embodiment of the present invention;

[0044] Figure 9 A comparison diagram of axial characteristics in a preferred embodiment of the present invention;

[0045] Figure 10The evolution process of the broadband car navigation glass antenna structure in the preferred embodiment of the present invention Figure 1 ;

[0046] Figure 11 The evolution process of the broadband car navigation glass antenna structure in the preferred embodiment of the present invention Figure 2 ;

[0047] Figure 12 The evolution process of the broadband car navigation glass antenna structure in the preferred embodiment of the present invention Figure 3 ;

[0048] Figure 13 The evolution process of the broadband car navigation glass antenna structure in the preferred embodiment of the present invention Figure 4 .

[0049] Explanation of the reference numerals in the specification: groove one 1, groove two 11, first side 12, boss one 121, second side 13, third side 14, fourth side 15, component one 2, component two 3, component three 4, component seven 41, component eight 42, component four 5, component five 6, component six 7. DETAILED DESCRIPTION

[0050] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0051] Reference Figure 1As shown, the broadband car navigation glass antenna of the present invention includes: component one 2, component two 3, component three 4, component four 5, component five 6 and component six 7; component one 2, which serves as the floor of the antenna, and the center of the component one 2 is provided with a groove one 1, and a groove two 11 is provided between the groove one 1 and the edge of the component one 2, and the groove two 11 is used as a feeding port; component two 3, which is a feeding microstrip structure, the cross section of the component two 3 is Γ-shaped, one end of the component two 3 is arranged in the groove two 11, and the other end of the component two 3 is located in the groove one 1; component three 4, which is a patch structure for guiding current, the cross section of the component three 4 is Γ-shaped, and the component three 4 is located in the groove one 1, and one end of the component three 4 is connected to the component two 3 is connected at a corner position in the groove 1; component 45 is a coupling part, the cross section of the component 45 is Γ-shaped, and the component 45 is located in the groove 1; component 56 is a grounding strip used to increase the path of the current, the cross section of the component 56 is U-shaped, the component 56 is located in the groove 1, and the two ends of the U-shape of the component 56 are connected to the inner wall of the groove 1; component 67 is a coupling branch, the component 67 is provided in a plurality, and a plurality of components 67 are provided outside the component 12, one end of the component 67 is connected to the outer wall of the component 12, and the component 67 is used to adjust parameters to obtain the broadband required by the antenna; the component 12, component 23, component 34, component 45, component 56 and component 67 are installed on the automobile glass.

[0052] In the broadband car navigation glass antenna mentioned above, the floor in the antenna structure is a circular structure with a groove in the center (component one 2). A Γ-shaped feeding microstrip structure (component two 3) is introduced at one side of the floor; a Γ-shaped branch is extended from the other end of the feeding structure (component three 4), and a Γ-shaped coupling part is added above component three 4 (component four 5); a U-shaped grounding strip is introduced on the right side of the groove (component five 6) and four pairs of rectangular branches are loaded at the four corners of the floor (component six 7).

[0053] Reference Figure 2 As shown in the figure, the specific parameters of the antenna are as follows: H=2.1mm; L=100mm; R=50mm; T=60mm; a=6mm; b=6mm; g=0.5mm; L1=15mm; L2=26mm; L3=12mm; L4=35mm; L5=11mm; L6=32mm; WS=5mm; W1=6.5mm; W2=5mm; W3=5mm; W4=4mm; W5=3mm; W6=2mm.

[0054] The performance of the antenna is as follows Figure 3-7As shown, the antenna's performance fully covers a wide range of satellite positioning frequencies. Its impedance bandwidth is 1.03GHz-2.24GHz, its axial ratio bandwidth is 1.00GHz-1.77GHz, and its gain bandwidth (above 3dB) is 0.9GHz-1.71GHz. At frequency B3 (1.268GHz), the radiation direction is directly upward in the +z direction, exhibiting wide beam characteristics and achieving a forward gain of 3.48dBic. At frequency L1 (1.575GHz), it also exhibits wide beam characteristics and a forward gain of 3.55dBic.

[0055] In the above structure, component 1 (2) is in the shape of a circular sheet. Groove 1 (1) is located at the center of component 1 (2), and its cross-section is rectangular. Its four sides are a first side 12, a second side 13, a third side 14, and a fourth side 15. Groove 2 (11) is located between the first side 12 and the outer circumference of component 1 (2), and is a rectangular groove. Both ends of component 5 (6) are connected to fourth side 15. One of the Γ-shaped edges of component 2 (3) located within groove 1 is directly opposite first side 12, and two right-angled edges of component 3 (4) are directly opposite first side 12 and second side 13, respectively.

[0056] In the above structure, the first side 12 is divided into two parts by the groove 2 11. The two parts of the first side 12 are respectively opposite to one side of the component 2 3 and one side of the component 3 4. The part of the first side 12 opposite to the component 3 4 is provided with a boss 121. The boss 121 protrudes toward the center of the groove 1, and the boss 121 is a rectangular boss.

[0057] In the above structure, the cross-section of the component 6 7 is rectangular. There are eight components 6 7, and the eight components 6 7 are grouped in pairs. The eight components 6 7 are divided into four groups, and the four groups of components 6 7 are arranged in a circular array with the center of the component 1 2 as the center.

[0058] In the above structure, the third component 4 includes a seventh component 41 and an eighth component 42. Both components 41 and 42 are rectangular branches, and the eighth component 42 is shorter than the seventh component 41. The seventh component 41 is positioned opposite the first boss 121, while the eighth component 42 is positioned opposite the second side 13. One end of the fourth component 5 is positioned opposite the eighth component 42, and the other end of the fourth component 5 extends toward the third side 14 and is positioned opposite the third side 14, with a gap between the fourth component 5 and the eighth component 42. The end of the seventh component 41 away from the first side 12 forms a raised step relative to the end of the second component 3 away from the first side 12.

[0059] In the above structure, the impedance bandwidth of the antenna is: 1.03GHz-2.24GHz, the axial ratio bandwidth is: 1.00GHz-1.77GHz, and the gain bandwidth above 3dB is: 0.9GHz-1.71GHz.

[0060] Reference Figure 10-13 As shown, the construction process of the broadband car navigation glass antenna of the present invention is as follows:

[0061] Component 1 2, component 2 3, component 3 4, component 4 5, component 5 6, and component 6 7 are sequentially arranged on a 100 mm x 100 mm window glass. The glass has a dielectric constant of 7, a loss tangent of 0.01, and a thickness of 2.1 mm.

[0062] Antenna First design a simple conformal antenna on the above glass Figure 10 Medium structure. The structure is a circular ground plane with an asymmetric square groove in the center. The feed consists of a Γ-shaped patch and extended rectangular branches. The impedance bandwidth covers low frequencies of 0.96 GHz to 1.03 GHz and 1.11 GHz to 1.45 GHz, but does not yet cover the 1.575 GHz band. Figure 10 The axial ratio of the middle structure only covers: 1.02GHz-1.16GHz, which is far from covering the many frequency points required for navigation and positioning. In order to improve the axial ratio performance, a short branch is added to one end of the rectangular branch to form a lying Γ-shaped structure, and a new Γ-shaped patch is added on top to form Figure 11 The introduction of the Γ-shaped patch creates a new minimum axial ratio point at the high frequency of 1.5 GHz. Figure 11 The axial ratio bandwidth of the structure basically covers 1.06GHz to 1.58GHz. However, its impedance matching is poor in the range of 1.3GHz to 1.8GHz. In order to improve the impedance performance, Figure 11 A U-shaped grounding strip is introduced to the right side of the slot in the middle structure, and Figure 12 The U-shaped ground strip increases the current path and, through the combined effect of the four resonant points, significantly improves the impedance characteristics, keeping the impedance below -10dB in both the 0.96GHz-1.88GHz and 1.96GHz-2.30GHz frequency bands. Figure 12 Compared with the structure Figure 11 The impedance bandwidth of the structure is extended to 540MHz. In order to achieve full bandwidth coverage of the required frequency band and ensure sufficient margin, Figure 12 A pair of parallel coupling branches are introduced into each of the four corners of the central structure to achieve the three lowest axial ratio points, thereby significantly improving the axial ratio bandwidth. Figure 12 The axial ratio bandwidth of the mid-structure is extended from 1.12GHz-1.60GHz to 1.00GHz-1.77GHz, an increase of 290MHz. Figure 13 The impedance bandwidth of the medium structure is 74.01% (1.03GHz-2.24GHz), and the axial ratio bandwidth is 55.60% (1.00GHz-1.77GHz).

[0063] The basic antenna model consists of a circular ground structure (component 1 2) with an asymmetric groove (groove 1) in the center, a Γ-shaped microstrip feed (component 2 3), and a rectangular branch (component 7 41) extending from one end of component 2 3. To achieve good performance at low frequencies, the asymmetric ground structure (component 1 2) is applied and the height difference between the left and right ground structures of the feed is adjusted to achieve the lowest point of the circular polarization axial ratio. The length of component 7 41 can also be adjusted to improve impedance matching at low frequencies. To generate resonance at high frequencies, a short branch (component 8 42) extends from the other end of component 7 41, forming a new Γ-shaped patch structure (component 3 4) to guide current. By increasing the length of component 8 42, the overall impedance bandwidth is shifted to the left. To achieve circular polarization performance at high frequencies, a Γ-shaped patch (component 4 5) is added above component 3 4, and the gap between components 3 4 and 4 5 is adjusted to improve the antenna's axial ratio. The introduction of component four 5 avoids the cancellation of the current on component four 5 and the current at the edge of the left slot while ensuring the improvement of the axial ratio performance, thus ensuring the stability of the high-frequency gain. In order to expand the dual-band to broadband, a U-shaped grounding strip (component five 6) is introduced on the right side of the slot to increase the current path, thereby improving the low-frequency impedance bandwidth performance. In order to further improve the antenna performance and ensure that the bandwidth fully covers the required frequency band, a pair of coupling branches (component six 7) are added to each of the four corners of component one 2. Each pair of branches has the same height and width and a certain spacing. Finally, by adjusting the parameters of the branches, this broadband car navigation glass antenna is obtained. In the present invention, each pair of branches adopts a rectangular structure, which is also applicable to other structures such as cut-angle structures, semicircular structures, etc.

[0064] Among them, component seven 41 is an extension of the feeding part. At low frequencies, the current of component seven 41 is stronger, which increases the current path and improves the low frequency. The introduction of component four 5 allows component seven 41 to provide coupling current to component four 5. The structure of component four 5 achieves the properties of regular current, provides a new horizontal current and vertical current, thereby realizing circular polarization, and finding the distance when the coupling ability is most effective by adjusting the parameters through the gap between them. The stability of the high-frequency gain is due to the fact that while introducing component four 5 to provide circular polarization for high frequencies, it avoids being too close to the left slot, causing current cancellation. For example, the rectangle will be too close to the left slot edge, and the current directions at these two places are opposite, which will lead to cancellation and a decrease in gain.

[0065] The broadband car navigation glass antenna of the present invention:

[0066] 1) It has wide impedance bandwidth and wide axial ratio bandwidth characteristics. The Γ-shaped feeding structure is combined with an asymmetric circular ground to generate resonance at low frequencies and has certain circular polarization performance. A Γ-shaped patch is introduced above the feeding structure, and the gap between the feeding structure and the Γ-shaped patch is adjusted to better realize the orthogonal mode of the wide slot antenna. The U-shaped ground strip increases the current path to make the resonance more obvious, and the coupling branches at the four corners of the floor further expand the impedance bandwidth and axial ratio bandwidth. The navigation antenna achieves an impedance bandwidth of 74.01% (1.03GHz-2.24GHz) under the action of the four resonant points, and an axial ratio bandwidth of 55.60% (1.00GHz-1.77GHz) under the cooperation of the three lowest axial ratio points, thereby achieving a broadband effect.

[0067] 2) Utilizing Γ-shaped patches radiating from the slots improves axial ratio performance while avoiding current cancellation at the edges of the square slots, ensuring stable high-frequency gain and improving gain flatness across the entire frequency band. A gain bandwidth exceeding 3dB is achieved from 0.90GHz to 1.71GHz, with excellent gain flatness. This ensures a stable signal across the antenna frequency band, ensuring consistent signal quality regardless of frequency variations.

[0068] 3) Integrated design of a coplanar waveguide navigation antenna and automotive glass. Compared to multi-layer designs using probe feeds or patch designs with multi-port feeds, this invention integrates functional glass and antenna components, saving manufacturing costs while avoiding layout constraints, space congestion, and unsightly aesthetics.

[0069] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A broadband car navigation glass antenna, characterized in that: include: Component 1, which serves as the floor of the antenna, has a groove 1 at its center, and a groove 2 between the groove 1 and the edge of component 1, and the groove 2 serves as a feed port; Component 2 is a feed microstrip structure, the cross section of component 2 is in the shape of Γ, one end of component 2 is disposed in groove 2, and the other end of component 2 is located in groove 1; Component 3, which is a patch structure for guiding current, has a Γ-shaped cross-section and is located in groove 1. One end of component 3 is connected to the corner of component 2 located in groove 1; Component 4, which is a coupling portion, has a Γ-shaped cross section and is located in groove 1; Component 5 is a grounding strip used to increase the path of current. The cross-section of component 5 is U-shaped. Component 5 is located in groove 1, and both ends of the U-shape of component 5 are connected to the inner wall of groove 1. Component 6, which is a coupling branch, is provided in plurality, and the plurality of components 6 are disposed outside component 1, with one end of the component 6 connected to the outer wall of component 1. The component 6 is used to adjust parameters to obtain the required broadband of the antenna; The components 1, 2, 3, 4, 5 and 6 are installed on the automobile glass; The component one is in the shape of a circular thin sheet, the groove one is arranged at the center of the component one, and the cross-section of the groove one is rectangular, the four sides of the groove one are respectively divided into a first side, a second side, a third side and a fourth side, the groove two is arranged between the first side and the outer circumference of the component one, and the groove two is a rectangular groove, and the two ends of the component five are connected to the fourth side.

2. The broadband car navigation glass antenna according to claim 1, characterized in that: The first side is divided into two parts by groove 2, and the two parts of the first side are respectively opposite to one side of component 2 and one side of component 3. The part of the first side opposite to component 3 is provided with boss 1, and boss 1 protrudes toward the center of groove 1, and boss 1 is a rectangular boss.

3. The broadband car navigation glass antenna according to claim 1, characterized in that: The number of the components six is ​​8, and the 8 components six are grouped in pairs.

4. The broadband car navigation glass antenna according to claim 2, characterized in that: The component three includes component seven and component eight, both of which are rectangular branches, and the length of component eight is smaller than that of component seven. The component seven is arranged opposite to the boss one, and the component eight is arranged opposite to the second side.

5. The broadband car navigation glass antenna according to claim 4, characterized in that: One end of the component four is arranged opposite to the component eight, and the other end of the component four extends toward the third side and is arranged opposite to the third side.

6. The broadband car navigation glass antenna according to claim 4, characterized in that: An end of the component seven away from the first side forms a protruding step relative to an end of the component two away from the first side.

7. The broadband car navigation glass antenna according to claim 4, characterized in that: A gap is left between the fourth component and the eighth component.

8. The broadband car navigation glass antenna according to claim 1, characterized in that: The impedance bandwidth of the antenna is: 1.03GHz-2.24GHz, the axial ratio bandwidth is: 1.00GHz-1.77GHz, and the gain bandwidth above 3dB is: 0.9GHz-1.71GHz.

9. The broadband car navigation glass antenna according to claim 1, characterized in that: The cross section of the component six is ​​rectangular.

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