High-isolation antenna covering Beidou third-generation satellite navigation and short message communication frequency bands

Abstract

The embodiment of the invention provides a high-isolation antenna covering Beidou third-generation satellite navigation and short message communication frequency bands, and relates to the technical field of satellite navigation antennae. A first laminated micro-strip circularly polarized antenna, a single-layer micro-strip circularly polarized antenna and a second laminated micro-strip circularly polarized antenna are mounted on the mounting plate side by side; the single-layer micro-strip circularly polarized antenna is located between the first laminated micro-strip circularly polarized antenna and the second laminated micro-strip circularly polarized antenna; wherein the first laminated microstrip circularly polarized antenna comprises an S antenna unit and a BDS B3 antenna unit which are sequentially laminated from top to bottom; the single-layer microstrip circularly polarized antenna comprises a BDS B1 antenna unit; and the second laminated microstrip circularly polarized antenna comprises an L antenna unit and a B2b antenna unit which are sequentially laminated from top to bottom. According to the invention, Beidou third-generation satellite navigation and short message receiving and transmitting can be realized, and the antenna has the advantages of high gain, high isolation, miniaturization, low profile and the like.

Description

Technical Field

[0001] The present application relates to the technical field of satellite navigation antennas, and in particular to a high-isolation antenna covering the Beidou-III satellite navigation and short message communication frequency bands. Background Art

[0002] Beidou Satellite Navigation System (BDS) is a global satellite navigation system independently built and operated by my country with a view to national security and economic and social development needs. It can provide global users with all-weather, all-day, high-precision positioning, navigation, timing and short message services. The development of the Beidou system has gone through three stages: at the end of 2000, the Beidou-1 system was built to provide services to China; at the end of 2012, the Beidou-2 system was built to provide services to the Asia-Pacific region; in 2020, the Beidou-3 system was built to provide services to the world. With the successful global networking of the Beidou-3 system, Beidou satellite navigation and short message communication technologies have become increasingly mature and have begun to be applied in various industries. Antennas are an indispensable and very important component in radio systems, and their quality directly affects the overall performance of radio systems. In order to accelerate the penetration rate of the Beidou satellite navigation system and promote the orderly upgrading of Beidou-2 equipment to Beidou-3 equipment, it is of great significance to study antennas covering the Beidou-3 satellite navigation and short message communication frequency bands.

[0003] The frequency bands of BeiDou II antenna are four, namely BDS B1, BDS B3, short message reception S and short message transmission L. The frequency bands of BeiDou III antenna are five, namely BDS B1, BDS B3, regional short message reception S, global short message reception B2b and short message transmission L. In addition, in order to improve the service capability and service scope of BeiDou III, BeiDou III not only increases the B2b working frequency band, but also increases the bandwidth range of some frequency bands. Therefore, the difficulty of designing antennas covering BeiDou III frequency bands has been greatly increased, and most of the existing literature and patents have only studied BeiDou II antennas.

[0004] Satellite navigation and short message communication require that the terminal antenna has good circular polarization characteristics, high gain, small size, and low profile. Microstrip antennas can meet these requirements. However, the bandwidth of microstrip antennas is relatively narrow, and it is difficult to use one unit to cover the L to S frequency bands. In addition, the use of broadband antennas will cause large gain fluctuations at high and low frequencies, and complex back-end circuit design. Multi-layer overlapping combinations of microstrip patches are a common method to achieve multi-band antennas. However, since the frequency band range of B2b is relatively close to that of BDS B3, and the frequency band range of transmitting L is also relatively close to that of BDS B1, when the spacing between these antenna units is close or they are stacked, there will be a large mutual coupling between the units, which will seriously affect the overall performance of the antenna. In current literature and patents, researchers stack antennas of different frequency bands to achieve multi-band coverage, but severe mutual coupling (13dB) occurs between antenna units, resulting in low radiation efficiency of the antenna. Moreover, the stacking of a large number of units results in a high profile of the antenna (14mm), which is not conducive to conformal design of the platform. In addition, most literature and patents use a multi-feed method to achieve circular polarization, which adds an additional feeding network, resulting in a complex antenna structure and high cost. Summary of the invention

[0005] An embodiment of the present application provides a high-isolation antenna covering the Beidou-3 satellite navigation and short message communication frequency bands to solve the technical problems existing in the prior art.

[0006] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0007] According to a first aspect of an embodiment of the present application, a high isolation antenna covering the Beidou-3 satellite navigation and short message communication frequency bands is provided, including:

[0008] A mounting plate, on which a first stacked microstrip circularly polarized antenna, a single-layer microstrip circularly polarized antenna, and a second stacked microstrip circularly polarized antenna are mounted side by side;

[0009] The single-layer microstrip circularly polarized antenna is located between the first laminated microstrip circularly polarized antenna and the second laminated microstrip circularly polarized antenna;

[0010] Among them, the first stacked microstrip circularly polarized antenna includes an S antenna unit and a BDS B3 antenna unit stacked in sequence from top to bottom; the single-layer microstrip circularly polarized antenna includes a BDS B1 antenna unit; the second stacked microstrip circularly polarized antenna includes an L antenna unit and a B2b antenna unit stacked in sequence from top to bottom.

[0011] In some embodiments of the present application, based on the aforementioned scheme, the radiation patch shape and feeding form of the S antenna unit and the BDS B3 antenna unit are the same, and the radiation patch shape and feeding form of the L antenna unit and the B2b antenna unit are the same.

[0012] In some embodiments of the present application, based on the aforementioned solution, the S antenna unit and the BDS B3 antenna unit are both fed at diagonal positions, and the L antenna unit and the B2b antenna unit are both fed at central axis positions.

[0013] In some embodiments of the present application, based on the aforementioned solution, the BDS B1 antenna unit is fed at a diagonal position.

[0014] In some embodiments of the present application, based on the aforementioned solution, the single-layer microstrip circularly polarized antenna is closer to the first stacked microstrip circularly polarized antenna, and the single-layer microstrip circularly polarized antenna is farther from the second stacked microstrip circularly polarized antenna.

[0015] In some embodiments of the present application, based on the aforementioned solution, the S antenna unit is soldered to the radiation patch of the BDS B3 antenna unit by soldering, and the BDS B3 antenna unit is fixedly mounted on the mounting board by a dielectric substrate.

[0016] In some embodiments of the present application, based on the aforementioned solution, the L antenna unit is soldered to the radiation patch of the B2b antenna unit by soldering, and the B2b antenna unit is fixedly mounted on the mounting board by a dielectric substrate.

[0017] In some embodiments of the present application, based on the aforementioned solution, the BDS B1 antenna unit is fixedly mounted on the mounting plate via a dielectric substrate.

[0018] In some embodiments of the present application, based on the aforementioned scheme, the S antenna unit, the BDS B3 antenna unit, the BDS B1 antenna unit, the L antenna unit and the B2b antenna unit have no feeding network, and all adopt a single feeding method and are fed by coaxial feeding.

[0019] The technical solution of the present application is to form a first stacked microstrip circularly polarized antenna by superimposing the S antenna unit and the BDS B3 antenna unit, form a second stacked microstrip circularly polarized antenna by superimposing the L antenna unit and the B2b antenna unit, and form a single-layer microstrip circularly polarized antenna by the separate BDS B1 antenna unit. The first stacked microstrip circularly polarized antenna, the single-layer microstrip circularly polarized antenna and the second stacked microstrip circularly polarized antenna are installed side by side, so that the antenna proposed in the present application can simultaneously operate in five frequency bands of BDS B1, BDS B3, regional short message reception S, global short message reception B2b and short message transmission L, and can realize Beidou-3 satellite navigation and short message reception and transmission, and has the advantages of high gain, high isolation, miniaturization and low profile.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a high isolation antenna covering the Beidou-3 satellite navigation and short message communication frequency bands according to an embodiment of the present application is shown;

[0023] Figure 2 A top view of a high isolation antenna covering the Beidou-3 satellite navigation and short message communication frequency bands according to an embodiment of the present application is shown;

[0024] Figure 3 A front view of a high isolation antenna covering the Beidou-3 satellite navigation and short message communication frequency bands according to an embodiment of the present application is shown;

[0025] Figure 4 shows an S-parameter curve diagram of a BDS B3 antenna unit according to an embodiment of the present application;

[0026] Figure 5 shows an S parameter curve diagram of an S antenna unit according to an embodiment of the present application;

[0027] Figure 6 shows an S-parameter curve diagram of a BDS B1 antenna unit according to an embodiment of the present application;

[0028] Figure 7shows an S parameter curve diagram of a B2b antenna unit according to an embodiment of the present application;

[0029] Figure 8 shows an S parameter curve diagram of an L antenna unit according to an embodiment of the present application;

[0030] Fig. 9 shows the directional pattern of the BDS B3 antenna unit according to one embodiment of the present application;

[0031] Fig.10 shows a directional diagram of an S antenna unit according to an embodiment of the present application;

[0032] Fig.11 shows the directional pattern of the BDS B1 antenna unit according to one embodiment of the present application;

[0033] Fig.12 shows a directional diagram of a B2b antenna unit according to an embodiment of the present application;

[0034] Fig.13 The figure shows the directional pattern of the L antenna unit according to one embodiment of the present application.

[0035] Description of reference numerals:

[0036] 1-Mounting plate, 2-BDS B3 antenna unit, 3-S antenna unit, 4-BDS ​​B1 antenna unit, 5-B2b antenna unit, 6-L antenna unit, 7-Mounting screws, 21-BDS B3 antenna unit dielectric substrate, 22-BDS B3 antenna unit radiation patch, 23-BDS B3 antenna unit feeding point, 31-S antenna unit radiation patch, 32-S antenna unit feeding point, 33-S antenna unit dielectric substrate, 41-BDS B1 antenna unit dielectric substrate, 42-BDS B1 antenna unit feeding point, 43-BDS B1 antenna unit radiation patch, 51-B2b antenna unit dielectric substrate, 52-B2b antenna unit radiation patch, 53-B2b antenna unit feeding point, 61-L antenna unit radiation patch, 62-L antenna unit feeding point, 63-L antenna unit dielectric substrate. DETAILED DESCRIPTION

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0038] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0039] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0040] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Some embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0044] This application rationally plans the layout of units in a limited space based on the five frequency bands of Beidou-3 satellite navigation and short message communication to improve isolation and reduce profile.

[0045] Specifically, the embodiment of the present application provides a high isolation antenna covering the Beidou III satellite navigation and short message communication frequency bands, the antenna comprising:

[0046] A mounting plate, on which a first stacked microstrip circularly polarized antenna, a single-layer microstrip circularly polarized antenna, and a second stacked microstrip circularly polarized antenna are mounted side by side;

[0047] The single-layer microstrip circularly polarized antenna is located between the first laminated microstrip circularly polarized antenna and the second laminated microstrip circularly polarized antenna;

[0048] Among them, the first stacked microstrip circularly polarized antenna includes an S antenna unit and a BDS B3 antenna unit stacked in sequence from top to bottom; the single-layer microstrip circularly polarized antenna includes a BDS B1 antenna unit; the second stacked microstrip circularly polarized antenna includes an L antenna unit and a B2b antenna unit stacked in sequence from top to bottom.

[0049] It should be noted that since the operating frequency bands of the B2b antenna unit and the BDS B3 antenna unit are low, the sizes of these two units are large, so the B2b antenna unit is used as the second layer in the first stacked microstrip circularly polarized antenna, and the BDS B3 antenna unit is used as the second layer in the second stacked microstrip circularly polarized antenna.

[0050] In addition, since the frequency bands of the B2b antenna unit and the BDS B3 antenna unit are close to each other, the two antenna units are placed at positions far apart, and the BDS B1 antenna unit is placed between them.

[0051] It should be noted that in order to improve the isolation between antenna units in this embodiment, the operating frequency bands between the upper and lower antenna units of the laminated structure need to have a certain interval. The frequency band interval between the S antenna unit and the BDS B3 antenna unit is large, so the S antenna unit is laminated with the BDS B3 antenna unit. The bandwidth of the BDS B1 antenna unit is wider than that of the L antenna unit, and the cross-section will be higher, so it is taken as a separate unit. The L antenna unit is laminated with the B2b antenna unit.

[0052] For example, Figure 1 As shown, a three-dimensional structural schematic diagram of a high-isolation antenna covering the Beidou-3 satellite navigation and short message communication frequency bands provided by an embodiment of the present application is shown.

[0053] like Figure 1As shown, the BDS B3 antenna unit 2 and the S antenna unit 3 are superimposed to form a first stacked microstrip circularly polarized antenna, the BDS B1 antenna unit 4 forms a single-layer microstrip circularly polarized antenna, the B2b antenna unit 5 and the L antenna unit 6 form a second stacked microstrip circularly polarized antenna, the first stacked microstrip circularly polarized antenna, the single-layer microstrip circularly polarized antenna and the second stacked microstrip circularly polarized antenna are installed side by side on the mounting plate 1, and the single-layer microstrip circularly polarized antenna is located between the first stacked microstrip circularly polarized antenna and the second stacked microstrip circularly polarized antenna.

[0054] In some feasible embodiments, based on the aforementioned scheme, the radiation patch shape and feeding form of the S antenna unit and the BDS B3 antenna unit are the same, and the radiation patch shape and feeding form of the L antenna unit and the B2b antenna unit are the same.

[0055] It should be noted that, in this embodiment, in order to reduce structural interference and improve the circular polarization characteristics of the antenna, this embodiment keeps the radiation patch shapes and feeding forms of the upper and lower antenna units in the first and second stacked microstrip circularly polarized antennas as consistent as possible.

[0056] For example, if the upper antenna unit in a stacked microstrip circularly polarized antenna is fed at a diagonal position, then the corresponding lower antenna unit is also fed at a diagonal position; if the upper antenna unit is fed along the central axis, then the lower antenna unit is also fed along the central axis.

[0057] In some feasible embodiments, based on the above scheme, the S antenna unit and the BDS B3 antenna unit are both fed at diagonal positions, and the L antenna unit and the B2b antenna unit are both fed at central axis positions.

[0058] It can be understood that the S antenna unit and the BDS B3 antenna unit are both fed at the diagonal position, which means that the S antenna unit is fed at the diagonal position of the S antenna unit, and the BDS B3 antenna unit is fed at the diagonal position of the BDS B3 antenna unit. The L antenna unit and the B2b antenna unit are both fed at the central axis position, which means that the L antenna unit is fed at the central axis position of the L antenna unit, and the B2b antenna unit is fed at the central axis position of the B2b antenna unit. In a specific embodiment, the S antenna unit and the BDS B3 antenna unit are coaxially stacked, so the diagonals of the two are the same line; similarly, the L antenna unit and the B2b antenna unit are also coaxially stacked, so the central axes of the two are also the same line.

[0059] In some feasible embodiments, based on the above solution, the BDS B1 antenna unit is fed at a diagonal position.

[0060] It can be understood that, in this embodiment, in order to improve the isolation between the BDS B1 antenna unit and the L antenna unit, when the L antenna unit is fed at the central axis position, the BDS B1 antenna unit is fed at the diagonal position.

[0061] In some feasible embodiments, based on the above scheme, the single-layer microstrip circularly polarized antenna is closer to the first stacked microstrip circularly polarized antenna, and the single-layer microstrip circularly polarized antenna is farther from the second stacked microstrip circularly polarized antenna.

[0062] like Figure 1 As shown, the single-layer microstrip circularly polarized antenna composed of the BDS B1 antenna unit 4 is installed and fixed close to the first stacked microstrip circularly polarized antenna composed of the BDS B3 antenna unit 2 and the S antenna unit 3, and there is a certain distance between it and the second stacked microstrip circularly polarized antenna composed of the B2b antenna unit 5 and the L antenna unit 6.

[0063] In some feasible embodiments, based on the aforementioned solution, the S antenna unit is soldered to the radiation patch of the BDSB3 antenna unit by soldering, and the BDSB3 antenna unit is fixedly mounted on the mounting board by a dielectric substrate.

[0064] In some feasible embodiments, based on the aforementioned solution, the L antenna unit is soldered to the radiation patch of the B2b antenna unit by soldering, and the B2b antenna unit is fixedly mounted on the mounting board by a dielectric substrate.

[0065] In some feasible embodiments, based on the above solution, the BDS B1 antenna unit is fixedly mounted on the mounting plate through a dielectric substrate.

[0066] It should be noted that the screw installation and soldering methods make the installation structure of the antenna simple and firm.

[0067] For example, Figure 2 and Figure 3 As shown, the S antenna unit is composed of an S antenna unit radiation patch 31 and an S antenna unit dielectric substrate 33. The S antenna unit radiation patch 31 is arranged on the S antenna unit dielectric substrate 33, and the S antenna unit feed 32 is arranged on the diagonal of the S antenna unit; the BDS B3 antenna unit is composed of a BDS B3 antenna unit dielectric substrate 21 and a BDS B3 antenna unit radiation patch 22. The S antenna unit dielectric substrate 33 is soldered to the BDS B3 antenna unit radiation patch 22 by soldering, the BDS B3 antenna unit radiation patch 22 is arranged on the BDS B3 antenna unit dielectric substrate 21, the BDS B3 antenna unit dielectric substrate 21 is mounted on the mounting plate 1 by mounting screws 7, and the BDS B3 antenna unit feed 22 is arranged on the diagonal of the BDS B3 antenna unit.

[0068] like Figure 2 and Figure 3 As shown, the BDS B1 antenna unit consists of a BDS B1 antenna unit dielectric substrate 41 and a BDS B1 antenna unit radiation patch 43. The BDS B1 antenna unit radiation patch 43 is arranged on the BDS B1 antenna unit dielectric substrate 41. The BDS B1 antenna unit dielectric substrate 41 is mounted on the mounting plate 1 by mounting screws. The BDS B1 antenna unit feed 42 is arranged on the diagonal line of the BDSB1 antenna unit.

[0069] like Figure 2 and Figure 3 As shown, the L antenna unit is composed of an L antenna unit radiation patch 61 and an L antenna unit dielectric substrate 63, the L antenna unit radiation patch 61 is arranged on the L antenna unit dielectric substrate 63, and the L antenna unit feed point 62 is arranged on the central axis of the L antenna unit; the B2b antenna unit is composed of a B2b antenna unit dielectric substrate 51 and a B2b antenna unit radiation patch 52, the L antenna unit dielectric substrate 63 is soldered to the B2b antenna unit radiation patch 52, the B2b antenna unit radiation patch 52 is arranged on the B2b antenna unit dielectric substrate 51, the B2b antenna unit dielectric substrate 51 is installed on the mounting plate 1 by mounting screws, and the B2b antenna unit feed point 53 is arranged on the diagonal of the B2b antenna unit.

[0070] In some feasible embodiments, based on the above scheme, such as Figure 2 and Figure 3 As shown, the S antenna unit, the BDS B3 antenna unit, the BDS B1 antenna unit, the L antenna unit and the B2b antenna unit have no feeding network, and all adopt a single feeding method and are fed by coaxial feeding.

[0071] Below, a specific example is provided.

[0072] According to the operating frequency of each antenna unit, a dielectric substrate with different dielectric constants and sizes is selected. In this example, the material of the dielectric substrate of the BDS B3 antenna unit is Arlon AD600(tm), with a dielectric constant of ε r =6.15, size is 60mm*58mm*3mm; the material of the S antenna unit dielectric substrate is Arlon AD1000(tm), the dielectric constant ε r =10.2, size is 30mm*30mm*2mm; the material of the BDS B1 unit dielectric substrate is Arlon AD1000(tm), the dielectric constant ε r=10.2, size is 40mm*37mm*4mm; the material of the B2b unit dielectric substrate is Arlon AD600(tm), the dielectric constant ε r =6.15, size is 60mm*60mm*3mm; the material of L unit dielectric substrate is Arlon AD1000(tm), dielectric constant ε r =10.2, size is 36mm*36mm*3mm.

[0073] In this example, dielectric substrates of different materials and thicknesses are used for stacking design according to the frequency band range of the five antenna units. The overall thickness of the antenna dielectric substrate is 6 mm, which realizes the miniaturization and low profile of the overall antenna structure, and is conducive to conformal design with the platform.

[0074] The antenna units in this example have no feeding network, and all five antenna units adopt the single feeding method and are fed by coaxial feeding.

[0075] The mounting structure of the antenna in this example is simple and firm. The lower layer or independent antenna unit is fixed to the mounting plate with four mounting screws, and the upper layer antenna unit is soldered to the lower layer radiation patch.

[0076] like Figures 4 to 8 The following are the S parameter curves of the BDS B3 antenna unit, the S antenna unit, the BDS B1 antenna unit, the B2b antenna unit and the L antenna unit in this example. Figure 4 It can be seen that the reflection coefficient performance of the BDS B3 antenna unit in the BDS B3 frequency band is good, less than -13dB, and the isolation with the other four antenna unit ports is high in this frequency band, greater than 21dB.

[0077] Table 1 Summary of S parameters of the five antenna elements

[0078] Antenna unit BDS B3 S BDS B1 B2b L Reflection coefficient(dB) -13 -16.3 -13.3 -15 -17 Mutual coupling(dB) -21 -26.5 -19.0 -25.2 -22.8

[0079] from Figures 4 to 8 As can be seen from Table 1, the reflection coefficient performance of the five antenna units in their respective frequency bands is very good, and the isolation between each antenna unit and the other four antenna units is greater than 19 dB, so there is no significant impact between the antenna units, and good transmit and receive isolation can be achieved.

[0080] See also Figure 4 Since the frequency band of the B2b antenna unit is close to that of the BDS B3 antenna unit, the mutual coupling between the two antenna units is relatively strong. Since the distance between the BDS B1 antenna unit and the BDS B3 antenna unit is relatively close, the mutual coupling is also relatively strong.

[0081] See also Figure 5 Since the operating frequency band of the S antenna unit is far away from the operating frequency bands of other units, the mutual coupling is relatively weak, less than -26.5dB.

[0082] Similarly, see Figures 6 to 8 It can be seen that the isolation between antenna units is mainly related to the working frequency band and spacing between units. In this example, according to the range of each frequency band of Beidou III navigation and short message, units with similar frequencies are separated and units with larger frequency band spacing are selected for stacking design, thus effectively reducing the mutual coupling between units.

[0083] like Figures 9 to 13 The directional patterns of the BDS B3 antenna unit, S antenna unit, BDS B1 antenna unit, B2b antenna unit and L antenna unit are shown in this example. Fig. 9 It can be seen that the BDS B3 antenna unit is a right-hand circularly polarized antenna, and the axial ratio is converted to 2.1dB. The circular polarization characteristics of the antenna are good. The gain of the BDS B3 antenna unit in the 0-degree direction is about 4.3dBi, and the gain in the 70-degree direction is about -3.1dBi. The antenna gain is high, and there is no pattern distortion, and the pattern characteristics are good.

[0084] Table 2 Summary of the radiation patterns of the five antenna elements at their respective operating frequencies

[0085]

[0086] from Figures 9 to 13 As can be seen from Table 2, the circular polarization characteristics of the five antenna units are good (small axial ratio), the antenna gain is high (about 4 dBi or more), and there is no radiation pattern distortion, and the radiation pattern characteristics are good.

[0087] From the above description, it can be seen that the high-isolation antenna covering the Beidou-3 satellite navigation and short message communication frequency bands provided in this example has the characteristics of high gain, high isolation, miniaturization and low profile, and is suitable for use in Beidou satellite navigation and short message communication system terminal equipment.

[0088] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. It should be understood that the present application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A high isolation antenna covering the Beidou III satellite navigation and short message communication frequency band, characterized in that: include: A mounting plate, on which a first stacked microstrip circularly polarized antenna, a single-layer microstrip circularly polarized antenna, and a second stacked microstrip circularly polarized antenna are mounted side by side; The single-layer microstrip circularly polarized antenna is located between the first laminated microstrip circularly polarized antenna and the second laminated microstrip circularly polarized antenna; Among them, the first stacked microstrip circularly polarized antenna includes an S antenna unit and a BDSB3 antenna unit stacked in sequence from top to bottom; the single-layer microstrip circularly polarized antenna includes a BDS B1 antenna unit; the second stacked microstrip circularly polarized antenna includes an L antenna unit and a B2b antenna unit stacked in sequence from top to bottom.

2. The antenna according to claim 1, characterized in that The S antenna unit and the BDS B3 antenna unit have the same radiation patch shape and feeding form, and the L antenna unit and the B2b antenna unit have the same radiation patch shape and feeding form.

3. The antenna according to claim 2, characterized in that: The S antenna unit and the BDS B3 antenna unit are both fed at diagonal positions, and the L antenna unit and the B2b antenna unit are both fed at central axis positions.

4. The antenna according to claim 3, characterized in that: The BDS B1 antenna unit is fed in a diagonal position.

5. The antenna according to claim 1, characterized in that The single-layer microstrip circularly polarized antenna is closer to the first stacked microstrip circularly polarized antenna, and the single-layer microstrip circularly polarized antenna is farther from the second stacked microstrip circularly polarized antenna.

6. The antenna according to claim 1, characterized in that The S antenna unit is soldered to the radiation patch of the BDSB3 antenna unit by soldering, and the BDSB3 antenna unit is fixedly mounted on the mounting plate by a dielectric substrate.

7. The antenna according to claim 1, characterized in that: The L antenna unit is soldered to the radiation patch of the B2b antenna unit by soldering, and the B2b antenna unit is fixedly mounted on the mounting plate by a dielectric substrate.

8. The antenna according to claim 1, characterized in that: The BDS B1 antenna unit is fixedly mounted on the mounting plate via a dielectric substrate.

9. The antenna according to claim 1, characterized in that: The S antenna unit, the BDS B3 antenna unit, the BDS B1 antenna unit, the L antenna unit and the B2b antenna unit have no feeding network, and all adopt a single feeding method and are fed by coaxial feeding.

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