CN110401035B - Vehicle-mounted antenna system with FM frequency band radiation function cellular antenna isolator - Google Patents
Vehicle-mounted antenna system with FM frequency band radiation function cellular antenna isolator Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
Abstract
The application provides a vehicle antenna system with FM frequency band radiation function cellular antenna isolator, include: the antenna comprises a first antenna, a second antenna, a third antenna, a fourth antenna, a fifth antenna, a sixth antenna, a seventh antenna and a eighth antenna, wherein the isolator is positioned between the first antenna and the second antenna and comprises an upright layer and a top loading layer; through the structure setting, can realize the FM antenna function, and because the existence of this structure for isolation between first antenna and the second antenna promotes, thereby can reduce the distance between first antenna and the second antenna, reduce to less than 30mm by 39mm among the prior art for example, and then make on-vehicle antenna system occupation space reduce, more miniaturization and integration.
Description
Technical Field
The invention relates to the technical field of radio frequency elements, in particular to a vehicle-mounted antenna system with an FM frequency band radiation function cellular antenna isolator.
Background
With the rapid development of wireless communication technology, the internet of vehicles has grown. In order to meet the information interaction of a large number of different functions, antennas with different frequency bands must be installed on a vehicle, and due to the limited space given to the antennas on the vehicle, the integration and miniaturization of the vehicle-mounted antennas are the necessary trend of future development. Antennas with different functions and different frequency bands are arranged in the space of the vehicle-mounted shark fin antenna shell, so that the coupling between the antennas is increased, and the communication quality is influenced; at the same time, miniaturization of the antenna also brings about a problem of low antenna gain. Therefore, in an integrated and miniaturized environment, how to reduce the coupling influence between vehicle-mounted antennas, improve the isolation between antennas and improve the antenna gain at the same time becomes a technical problem to be solved.
Disclosure of Invention
In view of this, the present invention provides a vehicle-mounted antenna system with a cellular antenna isolator having an FM frequency band radiation function, which can be used as an isolator to improve the isolation between vehicle-mounted cellular mobile communication antennas, and can be used as a high-gain FM antenna, so as to achieve miniaturization and integration, and simultaneously meet the requirements of improving the gain and the isolation between antennas of the antenna.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a vehicle-mounted antenna system with FM band radiating function cellular antenna isolator, comprising:
the first antenna, the isolator and the second antenna are sequentially arranged;
the first antenna and the second antenna are vehicle-mounted communication antennas;
the isolator is used for isolating the first antenna and the second antenna;
the isolator includes: a stand-up layer and a top loading layer;
the vertical layer comprises a first dielectric plate, a first metal curve and a second metal curve, and the first dielectric plate comprises a first surface and a second surface which are oppositely arranged; the first metal curve is positioned on the first surface, and the second metal curve is positioned on the second surface; the first metal curve comprises a first connecting section and a plurality of first Hilbert basic units, wherein the first connecting section is positioned at the top of the upright layer, the first connecting section is electrically connected with one of the first Hilbert basic units, and the first Hilbert basic units are electrically connected end to end; the second metal curve comprises a second connecting section and a third connecting section, one end of the second connecting section is electrically connected with one end, far away from the first connecting section, of the first Hilbert basic units after being connected, and the other end of the second connecting section is electrically connected with the top loading layer; one end of the third connecting section is used as a feed point of the vehicle-mounted antenna structure, and the other end of the third connecting section is electrically connected with the top loading layer;
the top loading layer comprises a second dielectric plate and a third metal curve, and the second dielectric plate comprises a third surface and a fourth surface which are oppositely arranged; the third metal curve comprises a plurality of second Hilbert basic units, the plurality of second Hilbert basic units are electrically connected end to form two free ends, and the two free ends are electrically connected with the second connecting section and the third connecting section respectively;
the first dielectric plate is a hard dielectric plate, the second dielectric plate is a flexible dielectric plate, is arranged at the top of the vertical layer in a covering manner, and is folded along the outline of the top edge of the vertical layer; the third metal curve is located on the third surface.
Preferably, the first antenna and the second antenna each comprise a dielectric substrate and a metal wire, and the dielectric substrate and the first dielectric plate are located on the same plane and are integrally formed.
Preferably, the metal wires of the first antenna and the second antenna are both located on the same side surface of the dielectric substrate as the first surface.
Preferably, the first Hilbert basic unit and the second Hilbert basic unit are both third-order Hilbert curves.
Preferably, the number of the first Hilbert basic units is 2, the number of the second Hilbert basic units is 4, and the peripheral outline of the 4 Hilbert basic units is square.
Preferably, the linewidth of the Hilbert curve is 0.5mm, and the interval between adjacent wires is 2.5mm.
Preferably, the second dielectric plate is one of a Rogers5880 flexible substrate, an F4B flexible substrate, or an FPC flexible circuit board.
Preferably, the thickness of the second dielectric plate is 0.2mm.
Preferably, the top loading layer is doubled over with respect to the top edge profile of the upstanding layer.
According to the technical scheme, the vehicle-mounted antenna system with the cellular antenna isolator with the FM frequency band radiation function comprises the isolator positioned between the first antenna and the second antenna besides the first antenna and the second antenna, and the isolator comprises an upright layer and a top loading layer; through the structure setting, can realize the FM antenna function, and because the existence of this structure for isolation between first antenna and the second antenna promotes, thereby can reduce the distance between first antenna and the second antenna, reduce to less than 30mm by 39mm among the prior art for example, and then make on-vehicle antenna system occupation space reduce, more miniaturization and integration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a vehicle-mounted antenna system in the prior art;
fig. 2 is a schematic diagram of a first surface structure of a vehicle-mounted antenna system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a second surface structure of a vehicle-mounted antenna system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an isolator according to an embodiment of the present invention;
FIG. 5 is a schematic view of a first surface structure of an upstanding layer of an isolator according to an embodiment of the present invention;
FIG. 6 is a schematic view of a second surface structure of an upstanding layer of an isolator according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a top loading layer structure according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a first to fourth order Hilbert fractal shape;
fig. 9 is a schematic diagram of Hilbert curve parameters according to an embodiment of the present invention;
fig. 10 is a graph of a reflection coefficient S11 when the isolator provided by the embodiment of the invention is used as an on-vehicle FM antenna;
FIG. 11 is a gain pattern of the isolator according to the embodiment of the present invention when the isolator is used as a vehicle-mounted FM antenna;
fig. 12 is a graph comparing S21 curves before and after adding an isolator in the vehicle-mounted antenna system according to the embodiment of the present invention.
Detailed Description
As described in the background art section, the integration and miniaturization of the vehicle-mounted antenna in the prior art become a necessary research direction, but with the miniaturization, antennas with different functions and different frequency bands are disposed in the same space, which inevitably results in insufficient isolation between the antennas, and the communication quality is affected.
The inventors have found that miniaturization, integration and improvement of antenna gain, and improvement of isolation between antennas are contradictory. As shown in fig. 1, a schematic structural diagram of a vehicle antenna system in the prior art is shown, where the vehicle antenna system in the prior art includes a first vehicle communication antenna 101 and a second vehicle communication antenna 102, where the distance between the two antennas is G, about 39mm, and the distance is already the limit distance, and if the two antennas are close to each other, mutual interference occurs between the two antennas. The conventional methods for improving the passive gain and the isolation between the antennas of the vehicle-mounted antennas are to increase the height of the antennas, use plate slotting and slotting, load parasitic elements and the like, which results in that the antennas cannot be miniaturized. However, as research has found that metamaterials are characterized by an equivalent magnetic permeability or an equivalent permittivity that is negative, they can exhibit electromagnetic properties that are opposite to those of natural materials. The electromagnetic metamaterial technology is reasonably applied, and the high-performance miniaturized antenna structure can be realized. The appearance of the artificial electromagnetic metamaterial provides a new design idea for improving the antenna gain in an integrated and miniaturized environment and solving the problem of coupling between antennas.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a vehicle-mounted antenna system with an FM frequency band radiation function cellular antenna isolator, please refer to fig. 2-3, wherein fig. 2 is a schematic diagram of a first surface structure of the vehicle-mounted antenna system provided by the embodiment of the invention; fig. 3 is a schematic diagram of a second surface structure of a vehicle-mounted antenna system according to an embodiment of the present invention; comprising the following steps: a first antenna 101, an isolator 103, and a second antenna 102, which are sequentially arranged; wherein, the first antenna 101 and the second antenna 102 are vehicle-mounted communication antennas; the isolator 103 is used for isolating the first antenna 101 and the second antenna 102; the isolator provided by the embodiment of the invention aims at the problem of lower antenna gain in the existing vehicle-mounted integrated antenna system, and an artificial electromagnetic metamaterial is formed by utilizing an artificial electromagnetic structure and a commercial dielectric substrate, and has the performance advantages of high performance and miniaturization.
It should be noted that, the first antenna and the second antenna all include dielectric substrate and metal wire, and dielectric substrate and first dielectric plate are located the coplanar, and integrated into one piece. That is, as shown in fig. 2, the plurality of antenna hard dielectric plates are shared. Except for the flexible dielectric plate of the top loading layer, other dielectric plates are shared. The metal wires of the first antenna and the second antenna are both positioned on the same side surface of the dielectric substrate as the first surface.
The isolator 103 not only can improve the isolation of the vehicle-mounted antenna system for the isolation between first antenna and the second antenna promotes, can reduce the distance between first antenna and the second antenna, reduces to being less than 30mm by 39mm among the prior art, and then makes vehicle-mounted antenna system occupation space reduce, miniaturized more and integration. The vehicle-mounted antenna system also has an FM antenna function, so that the vehicle-mounted antenna system has an FM frequency band radiation function.
Specifically, referring to fig. 4, fig. 4 is a schematic diagram of an isolator provided in an embodiment of the present invention, where the isolator includes:
a stand-up layer 1 and a top loading layer 2; the upstanding layer 1 comprises a first dielectric plate (not shown in the figures) comprising a first surface and a second surface arranged opposite each other, a first metal curve and a second metal curve; the first metal curve is located on the first surface, and the second metal curve is located on the second surface. The top loading layer 2 comprises a second dielectric plate and a third metal curve, the second dielectric plate comprising a third surface and a fourth surface arranged opposite to each other. In the embodiment of the invention, the first dielectric plate is a hard dielectric plate, and optionally, may be a PCB plate, so as to form a supporting function for the top loading layer. The second dielectric plate is a flexible dielectric plate, is arranged on the top of the upright layer 1 in a covering manner, and is folded along the outline of the top edge of the upright layer 1; the third metal curve is located on the third surface. In this embodiment, it is not limited whether the third surface is directed towards the standing layer or away from the standing layer, as long as it is possible to achieve that the top loading layer 2 covers the top of the standing layer 1 and forms a fold, achieving the FM antenna function.
It should be noted that, because the top loading layer covers the upright layer after being bent, in order to avoid short circuit connection between the metal curve on the top loading layer after being bent and the metal curve of the upright layer, in this embodiment, optionally, the metal curve on the top loading layer is located on a surface facing away from the upright layer, that is, the third surface is a surface facing away from the upright layer.
To further illustrate the separator provided in this embodiment, please refer to fig. 5 and 6, wherein fig. 5 is a schematic view of a first surface structure of the standing layer, and fig. 6 is a schematic view of a second surface structure of the standing layer; the first metal curve is located on the first surface of the first dielectric plate 11, and the first metal curve includes a first connection section 13 and a plurality of first Hilbert basic units 12, such as a dashed line frame in fig. 5, where the first connection section 13 is located on top of the upright layer, and the first connection section 13 is electrically connected to one of the first Hilbert basic units 12, and the plurality of first Hilbert basic units 12 are electrically connected end to end; the second metal curve comprises a second connecting section 14 and a third connecting section 15, one end B of the second connecting section 14 is electrically connected with one end B' far away from the first connecting section 13 after being connected with the plurality of first Hilbert basic units 12, and the other end D of the second connecting section 14 is electrically connected with the top loading layer; one end A of the third connecting section 15 is used as a feed point of the isolator, and the other end C is electrically connected with the top loading layer;
referring to fig. 7, fig. 7 is a schematic diagram of a top loading layer structure according to an embodiment of the present invention; the top loading layer includes a second dielectric plate 21 and a third metal curve 22, the third metal curve 22 includes a plurality of second Hilbert basic units, the plurality of second Hilbert basic units are electrically connected end to end, two free ends (C 'and D') are formed, and the two free ends (C 'and D') are electrically connected with the second connection section 14 and the third connection section 15 respectively.
It should be noted that, in this embodiment, the first Hilbert basic unit and the second Hilbert basic unit are both third-order Hilbert curves. Hilbert fractal antennas are typical designs in all antenna types at present, and are composed of a dielectric substrate, a wire layer and a grounding plate, wherein the wire layer is formed by Hilbert fractal, and fig. 8 is a schematic diagram of the shape of one-to-four-order Hilbert fractal, which can be described as: dividing the square into four first-order small squares, and sequentially connecting the centers of the squares at the lower left corner, the upper right corner and the lower right corner to obtain a parting unit (namely first-order Hilbert fractal); each first-order small square is divided into four second-order small squares, the above process is repeated, the opening directions of the generated high-order fractal units follow a certain rule (the opening directions of the high-order fractal units at the left lower corner, the left upper corner, the right upper corner and the right lower corner in fig. 8 are respectively left, lower and right in sequence), the openings of the parting units are connected according to a specific sequence (the openings of the high-order fractal units at the left lower corner, the left upper corner, the right upper corner and the right lower corner in sequence in fig. 8), and finally a curve capable of filling the whole square is obtained, namely a Hibert curve.
In this embodiment, the specific number of the first Hilbert basic units in the upright layer and the second Hilbert basic units in the top loading layer are not limited, alternatively, as shown in fig. 5, two first Hilbert basic units may be included in the upright layer, and as shown in fig. 7, four second Hilbert basic units may be included in the top loading layer. It should be noted that, in other embodiments, three, four or more first Hilbert base units may be further included in the standing layer 1. Likewise, eight or more second Hilbert base units may be included in the top loading layer.
It should be noted that, in this embodiment, the number and arrangement of the Hilbert curve units in the upright layer are not limited, and as shown in fig. 5, two Hilbert curve units may be disposed up and down, or a plurality of Hilbert curve units may be disposed, which is not limited in this embodiment. The arrangement shown in fig. 5 can make the equivalent length of the FM antenna bus length (all lengths of the FM antenna metal curves added up) reach the length required for 100MHz resonance, so as to realize the antenna resonance in the frequency band required for the FM receiver to work, and if other modes can reach the FM antenna resonance at 100MHz, the corresponding arrangement can be made.
In addition, in the present embodiment, the placement relationship between the vertical layer structure and the top loading layer structure is not limited, and the monopole antenna may be formed by connecting the metal of the top loading layer and the metal curve of the vertical layer structure.
The specific thickness of the dielectric sheet material of the upstanding layer structure is not limited in this embodiment, and the thickness of the optional dielectric sheet material is in the range of 0.5mm to 1.6mm, inclusive, and the specific material of the dielectric sheet material is not limited in this embodiment, and in one embodiment of the present invention, the dielectric sheet material may be an RF4 material, and the dielectric constant is 4.3 to 4.6, inclusive. Other PCB materials are also possible. The thickness of the dielectric plate (i.e. the second dielectric plate) of the top loading layer is 0.2mm, the material can be Rogers5880, and the material has flexible and bendable physical characteristics, so that the material can be attached to the inner wall of the radome, thereby improving the space utilization rate and further improving the antenna gain to the greatest extent. The metal layer of the top loading layer can also be engraved with a metal curve on the inner surface of the radome using a laser engraving process. It should be noted that, in this embodiment, the bending deformation of the top loading layer structure does not change the resonant frequency of the antenna. In other embodiments of the present invention, the second dielectric plate may be a flexible printed circuit board substrate such as an F4B flexible substrate, an FPC flexible circuit board, or the like, which is not limited in this embodiment.
In this embodiment, specific materials of the first metal curve, the second metal curve and the third metal curve in the FM antenna are not limited, and may be copper.
The metamaterial FM antenna provided in the embodiment consists of two parts, namely an upright layer and a top loading layer, the basic structures of the metamaterial FM antenna are Hilbert basic units, the Hilbert curve structure is shown in fig. 9, and specific parameters are shown in table 1.
| Width W | Length L | Line width s | Cell distance d | Thickness t of medium |
| 20mm | 20mm | 0.5mm | 1.5mm | 1.5mm |
The above-mentioned dielectric thickness is the dielectric thickness of the standing layer. Dielectric constant epsilon r =4.4. The Hilbert curve is similar in structure to a split-ring resonator, and the resonant frequency can be predicted by standing wave resonance theory, as follows:
f m ＝mc/2L (1)
f in m The resonant center frequency, c is the speed of light, m is the resonant set times, and L is the total length of the curve. The resonance bandwidth is related to the Hilbert curve compression ratio and curve width.
Taking the isolator shown in fig. 4, the line widths s of Hilbert basic units in the vertical layer are all 0.5mm, and the distances d between the basic units (namely between similar units) are 2.5mm as an example, the isolator provided by the invention can also improve the isolation between the vehicle-mounted mobile communication double antennas and is of a low-profile metamaterial structure.
The Hilbert basic unit size of the top loading layer is identical to the Hilbert unit size of the vertical layer, namely the line width s of each Hilbert unit is identical to the distance between the basic units, and the difference is only that the dielectric plate materials are different. The top loading layer Hilbert cell is based on Rogers5880 flexible material, and the thickness of the dielectric plate is 0.2mm, so that the dielectric plate can be internally attached to the inner wall of the shark fin housing.
As shown in FIG. 10, the reflection coefficient S11 curve of the high-gain metamaterial FM antenna provided by the embodiment of the invention, as can be seen from the graph, the working frequency band of the vehicle-mounted FM antenna provided by the embodiment of the invention is 87.5MHz-108MHz.
As shown in FIG. 11, in the gain pattern of the high-gain metamaterial FM antenna provided by the embodiment of the invention, through computer discretization calculation simulation analysis, when the vehicle-mounted metamaterial FM antenna provided by the embodiment of the invention works at a 98MHz main frequency point, the antenna gain is-22 dB.
That is, the metamaterial FM antenna provided by the embodiment of the invention has a center frequency point of 98MHz and an operating bandwidth of 87.5MHz-108MHz, including end point values. The Hilbert curve line width of the isolator in this example was 0.5mm and the total length was 134mm. The antenna has a total height in the vertical direction (i.e., a height up and down in fig. 4) of less than 45mm and a total width (herein, a distance between the left and right sides of the standing layer in fig. 4) of less than 32mm, so that it can be used as an integrated, miniaturized vehicle-mounted FM antenna having a high-gain FM function.
The novel cellular antenna system with the FM frequency band radiation function comprises a first antenna, a second antenna and an isolator positioned between the first antenna and the second antenna, wherein the isolator comprises a vertical layer and a top loading layer, the top loading layer which can be flexibly folded is arranged on the top of the vertical layer, and the metal curve structures in the top loading layer and the vertical layer are arranged through a Hilbert structure, so that the antenna structure with the FM function is realized. Because the standing layer and the top loading layer are both formed by adopting artificial electromagnetic metamaterial comprising a dielectric plate and a metal curve structure, and the metal curves are both formed by adopting Hilbert basic units, the isolator can realize FM function and meet the requirements of miniaturization, integration and high antenna gain.
When the isolator in the cellular antenna system provided by the invention is used as a vehicle-mounted FM antenna for radiation, the working main frequency point is 98MHz, the antenna gain is-22 dB, the effect curves are shown in figures 10 and 11, and the effect curves are respectively reflection parameters and gain patterns of radiation when the integrated metamaterial structure is used as the FM antenna; when the isolation is improved, the isolation between the first antenna and the second antenna is improved from less than 15dB to more than 22dB in a certain frequency band range within 0.5GHz-3GHz, and the effect curve is shown in figure 12. The solid curve in fig. 12 corresponds to the isolation curve without the isolator, the dotted curve corresponds to the isolation curve with the isolator loaded, and it can be seen from fig. 12 that the isolation parameter is all increased from less than 15dB to above 22dB.
The isolator can be integrated with a communication antenna system and other antennas (such as an FM frequency band broadcast antenna, a GPS antenna, a WiFi antenna, a Bluetooth antenna and the like) in the shark fin shell, and forms a set of high-gain and high-isolation vehicle-mounted antenna system together with a cellular antenna system.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or apparatus that comprises such element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A vehicle-mounted antenna system having an FM band radiating function cellular antenna isolator, comprising:
the first antenna, the isolator and the second antenna are sequentially arranged;
the first antenna and the second antenna are vehicle-mounted communication antennas;
the isolator is used for isolating the first antenna and the second antenna;
the isolator includes: a stand-up layer and a top loading layer;
the vertical layer comprises a first dielectric plate, a first metal curve and a second metal curve, and the first dielectric plate comprises a first surface and a second surface which are oppositely arranged; the first metal curve is positioned on the first surface, and the second metal curve is positioned on the second surface; the first metal curve comprises a first connecting section and a plurality of first Hilbert basic units, wherein the first connecting section is positioned at the top of the upright layer, the first connecting section is electrically connected with one of the first Hilbert basic units, and the first Hilbert basic units are electrically connected end to end; the second metal curve comprises a second connecting section and a third connecting section, one end of the second connecting section is electrically connected with one end, far away from the first connecting section, of the first Hilbert basic units after being connected, and the other end of the second connecting section is electrically connected with the top loading layer; one end of the third connecting section is used as a feed point of the vehicle-mounted antenna system, and the other end of the third connecting section is electrically connected with the top loading layer;
the top loading layer comprises a second dielectric plate and a third metal curve, and the second dielectric plate comprises a third surface and a fourth surface which are oppositely arranged; the third metal curve comprises a plurality of second Hilbert basic units, the plurality of second Hilbert basic units are electrically connected end to form two free ends, and the two free ends are electrically connected with the second connecting section and the third connecting section respectively;
the first dielectric plate is a hard dielectric plate, the second dielectric plate is a flexible dielectric plate, is arranged at the top of the vertical layer in a covering manner, and is folded along the outline of the top edge of the vertical layer; the third metal curve is located on the third surface.
2. The vehicle-mounted antenna system with the FM band radiating function cellular antenna isolator of claim 1, wherein said first antenna and said second antenna each comprise a dielectric substrate and a metal wire, said dielectric substrate and said first dielectric substrate are located on the same plane and are integrally formed.
3. The vehicle-mounted antenna system with FM band radiating function cellular antenna isolator of claim 2, wherein the metal wires of said first antenna and said second antenna are both located on a same side of said dielectric substrate as the first surface.
4. The vehicle antenna system with FM band radiation function cellular antenna isolator of claim 1, wherein said first Hilbert base unit and said second Hilbert base unit are both third order Hilbert curves.
5. The vehicle antenna system with FM band radiation function cellular antenna isolator of claim 4, wherein said first number of Hilbert base units is 2, said second number of Hilbert base units is 4, and the peripheral outline of 4 of said Hilbert base units is square.
6. The vehicle antenna system with FM band radiating function cellular antenna isolator of claim 4, wherein the Hilbert curve has a linewidth of 0.5mm and a spacing between adjacent wires of 2.5mm.
7. The vehicle-mounted antenna system with the FM band radiating function cellular antenna isolator of claim 1, wherein said second dielectric plate is one of Rogers5880 flex substrate, F4B flex substrate or FPC flex circuit board.
8. The vehicle-mounted antenna system with FM band radiating function cellular antenna isolator of claim 1, wherein said second dielectric plate has a thickness of 0.2mm.
9. The vehicle antenna system with FM band radiating function cellular antenna isolator of claim 1, wherein said top loading layer is doubled over relative to a top edge profile of said upstanding layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN116683204A (en) * | 2022-02-22 | 2023-09-01 | 富泰京精密电子(烟台)有限公司 | Multiband vehicle-mounted antenna and vehicle antenna device |
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