Beidou antenna and satellite mobile terminal

Abstract

The invention discloses a Beidou antenna and a satellite mobile terminal, and belongs to the technical field of wireless communication. The Beidou antenna comprises a Beidou antenna arm which is of a cantilever structure; the phase modulation unit is connected to a first feed-in point on the Beidou antenna arm and is used for adjusting the impedance phase of a transmitting frequency band and the impedance phase of a receiving frequency band of the Beidou antenna to an in-phase phase region; the Beidou feed source is connected in series with the phase modulation unit and is used for communicating with a satellite system; wherein the transmitting antenna and the receiving antenna of the Beidou antenna share the Beidou antenna arm.

Description

Technical Field

[0001] The present application belongs to the field of wireless communication technology, and specifically relates to a Beidou antenna and a satellite mobile terminal. Background Art

[0002] With the advancement of science and technology, the functions of mobile terminals are also being updated, and demands such as fast network speed, low latency, and access or communication with the outside world anytime and anywhere have emerged. For remote areas without ground base station cellular network services or with weak base station signal coverage, satellite mobile terminals can achieve mobile communications based on mobile satellite communication systems.

[0003] At present, the Beidou antenna in the satellite mobile terminal generally adopts the multiplexing GPS-WIFI (Global Positioning System Wireless Fidelity) antenna structure, and controls the path of the RF signal source through the circuit switch. However, there is a large gap between the maximum radiation direction of the Beidou antenna and the maximum radiation direction of the reception, and the phase alignment effect is poor, which in turn affects the communication of satellite signals. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a Beidou antenna and a satellite mobile terminal, which can solve the problem of poor phase alignment in the maximum radiation direction of transmission and reception of the Beidou antenna in the related art.

[0005] In a first aspect, an embodiment of the present application provides a Beidou antenna, including: Beidou antenna arm is a cantilever structure; A phase adjustment unit, connected to the first feeding point on the Beidou antenna arm, used to adjust the impedance phase of the Beidou antenna transmitting frequency band and the impedance phase of the receiving frequency band to the same phase zone; A Beidou feed source, connected in series with the phase modulation unit, for communicating with a satellite system; Among them, the transmitting antenna and receiving antenna of the Beidou antenna share the Beidou antenna arm.

[0006] In a second aspect, an embodiment of the present application provides a satellite mobile terminal, comprising the Beidou antenna as described above, wherein the Beidou antenna is located at the top of the satellite mobile terminal.

[0007] In an embodiment of the present application, the impedance phase of the Beidou antenna's transmitting frequency band and the impedance phase of the receiving frequency band are adjusted to the same phase zone through a phase adjustment unit, which can reduce the phase difference between the maximum radiation direction of the Beidou antenna and the maximum radiation direction of the Beidou antenna, improve the phase alignment effect, and thereby improve the communication quality of the satellite signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1It is a schematic diagram of the test results of the Beidou antenna pattern in the related art; Figure 2 This is a schematic diagram of a Beidou antenna structure provided in an embodiment of the present application; Figure 3 It is a schematic diagram of another Beidou antenna structure provided in an embodiment of the present application; Figure 4 This is another schematic diagram of the Beidou antenna structure provided in an embodiment of the present application; Figure 5 is a schematic diagram of the Beidou antenna input impedance provided in an embodiment of the present application; Figure 6 is a schematic diagram of the inductance characteristics and capacitance characteristics of the parallel resonant structure provided in an embodiment of the present application; Figure 7 It is a schematic diagram of the test results of the Beidou antenna pattern provided in an embodiment of the present application; Figure 8 It is a schematic diagram of the structure of a satellite mobile terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0010] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0011] Embodiments of the present application relate to Beidou antennas and satellite mobile terminals. Among them, the satellite mobile terminal can communicate with the satellite system through the Beidou antenna. The Beidou antenna includes a transmitting antenna TX and a receiving antenna RX. The transmitting direction of TX and the receiving direction of RX can be represented by the parameters of the spherical coordinate system, the zenith angle θ and the azimuth angle φ. Among them, the zenith angle θ is the angle between the line from the origin to any point P and the positive z-axis. The azimuth angle φ is the angle between the projection line of the line from the origin to any point P in the xy plane and the positive x-axis.

[0012] Figure 1 The figure shows a schematic diagram of the test results of the directional pattern of the Beidou antenna in the related art. The horizontal axis in the figure represents the zenith angle θ, and the vertical axis represents the azimuth angle φ. Among them, the left figure is the test result of the directional pattern of the transmitting antenna TX of the Beidou antenna, and the shaded part is the maximum radiation direction of TX. The middle figure is the test result of the directional pattern of the receiving antenna RX of the Beidou antenna, and the shaded part is the maximum radiation direction of RX. The right figure is a schematic diagram of the overlap of TX and RX in the 30° area of ​​the dome. It can be seen from the figure that in the 30° area of ​​the dome, the maximum radiation direction of TX and the maximum radiation direction of RX have less overlap, indicating that the two have a large phase difference, which will affect the transmission and reception of satellite signals, resulting in a decrease in the quality of satellite communications.

[0013] Based on the above problems, the embodiments of the present application provide a Beidou antenna and a satellite mobile terminal. The impedance phase of the Beidou antenna's transmitting frequency band and the impedance phase of the receiving frequency band are adjusted to the same phase zone through a phase adjustment unit. This can reduce the phase difference between the maximum radiation direction of the Beidou antenna and the maximum radiation direction of the Beidou antenna, improve the phase alignment effect, and thereby improve the communication quality of the satellite signal.

[0014] The electronic device and display control method provided by the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0015] Figure 2 A schematic diagram of the Beidou antenna structure provided in an embodiment of the present application is shown. Figure 2 As shown, the Beidou antenna 200 includes: The Beidou antenna arm 10 is a cantilever structure. The cantilever structure is not directly grounded, but can be grounded by a switch. That is, a switch is provided between the Beidou antenna arm 10 and the antenna reference ground.

[0016] The phase adjustment unit 20 is connected to the first feeding point on the Beidou antenna arm 10, and is used to adjust the impedance phase of the Beidou antenna's transmitting frequency band and the impedance phase of the receiving frequency band to the same phase region.

[0017] The Beidou feed source 30 is connected in series with the phase modulation unit 20 and is used to communicate with the satellite system.

[0018] The transmitting antenna and receiving antenna of the Beidou antenna share the Beidou antenna arm 10 .

[0019] In the embodiment of the present application, the Beidou antenna arm 10 can be implemented by a metal cantilever. The length of the Beidou antenna arm 10 can be set according to various factors, such as referring to the appearance requirements (breakpoint symmetry) or other antenna (MHB antenna) requirements, etc., and the set value can be 36 mm, etc., which is not specifically limited.

[0020] See also Figure 3In the embodiment of the present application, the Beidou antenna 200 may further include: a first switch 40 and a first short-circuit branch 50 .

[0021] The first switch 40 is connected to the first feeding point 11 on the Beidou antenna arm 10 and is connected in series with the phase modulation unit 20. It is turned on when the Beidou feed source 30 is in a working state, and is turned off when the Beidou feed source 30 is in a non-working state.

[0022] The first short-circuit branch 50 is connected to the first switch 40 and the antenna reference ground respectively. When the Beidou feed 30 is in a non-working state, the Beidou feed 30 is connected to the antenna reference ground through the first short-circuit branch 50.

[0023] In the embodiment of the present application, the left and right sides of the Beidou antenna arm 10 are respectively coupled with the first radiation branch 61 and the second radiation branch 62, the first radiation branch 61 is connected to a GPS-WIFI (Global Positioning System WIreless Fidelity) feed source 1 for auxiliary gain adjustment, and the second radiation branch 62 is connected to an MHB (Middle High Band) feed source 2 for auxiliary gain adjustment. When the Beidou feed source 30 is in working state, the first radiation branch 61 and the second radiation branch 62 are both grounded.

[0024] In the embodiment of the present application, the frequency range of the low frequency includes but is not limited to: 700MHz-960MHz. The frequency range of the medium and high frequency includes but is not limited to: 1.71GHz-2.69GHz. The frequency service of the medium frequency includes but is not limited to: 1.71GHz-2.17GHz. The frequency range of the high frequency includes but is not limited to: 2.3GHz-2.69GHz. The frequency range of the Beidou transmitting antenna includes but is not limited to: 1615.68±7MHz, and the polarization mode is left-hand circular polarization. The frequency range of the Beidou receiving antenna includes but is not limited to: 2491.75±5MHz, and the polarization mode is right-hand circular polarization.

[0025] In the embodiment of the present application, a cellular feed source 3 may also be connected to the Beidou antenna arm 10 , and the Beidou antenna 200 may also include: a second switch 70 and a tuning branch 80 .

[0026] The second switch 70 is connected to the cellular feed source 3 and the second feeding point 22 on the Beidou antenna arm 10 respectively, and is turned on when the cellular feed source 3 is in a working state, and is turned off when the cellular feed source 3 is in a non-working state.

[0027] The tuning branch 80 is connected to the second switch 70 and the antenna reference ground respectively, and is used to perform tuning switching of different frequency bands when the cellular feed source 3 is in working state.

[0028] In the embodiment of the present application, an isolation adjustment unit 90 may also be connected to the Beidou antenna arm 10, and the isolation adjustment unit 90 is used to adjust the isolation between the Beidou antenna 200 and other antennas.

[0029] See also Figure 4 In one embodiment, both ends of the Beidou antenna arm 10 have a break at the first breakpoint 33 and the second breakpoint 44, respectively, the first feed point 11 is adjacent to the first breakpoint 33, and the Beidou antenna arm 10 also has a third point 55, the third point 55 is adjacent to the second breakpoint 44, and the third point 55 is grounded.

[0030] In one implementation manner, the grounding of the third point 55 may include capacitor grounding or weak inductive grounding.

[0031] In the embodiment of the present application, the phase modulation unit 20 may adopt an LC parallel resonance structure, which exhibits an inductance characteristic at the center frequency of the transmitting antenna and a capacitance characteristic at the center frequency of the receiving antenna.

[0032] In the embodiment of the present application, the above-mentioned in-phase phase zone is an area where the phase difference is within 30° of the dome.

[0033] The above-mentioned Beidou antenna provided in the embodiment of the present application adjusts the impedance phase of the Beidou antenna's transmitting frequency band and the impedance phase of the receiving frequency band to the same phase zone through a phase adjustment unit, which can reduce the phase difference between the maximum radiation direction of the Beidou antenna's transmission and the maximum radiation direction of the reception, improve the phase alignment effect, and thereby improve the communication quality of the satellite signal.

[0034] Figure 3 FIG. 4 shows another schematic diagram of the Beidou antenna structure provided in an embodiment of the present application. Figure 3 As shown, the Beidou antenna includes: The Beidou antenna arm 10 is a cantilever structure.

[0035] The phase adjustment unit 20 is connected to the first feeding point 11 on the Beidou antenna arm 10, and is used to adjust the impedance phase of the Beidou antenna's transmitting frequency band and the impedance phase of the receiving frequency band to the same phase region.

[0036] The Beidou feed source 30 is connected in series with the phase modulation unit 20 and is used to communicate with the satellite system.

[0037] The isolation adjustment unit 90 is connected to the Beidou antenna arm and is used to adjust the isolation between the Beidou antenna and other antennas.

[0038] The transmitting antenna and receiving antenna of the Beidou antenna share the Beidou antenna arm 10 .

[0039] In the present application examples, see Figure 3The Beidou antenna can also have a first switch branch, and the first switch branch includes: a first switch 40 and a first short-circuit branch 50. Among them, the first switch is shown as SW2 in the figure, and the first short-circuit branch is two devices below SW2, that is, it includes two short-circuit branches. The first switch 40 is connected to the first feeding point 11 on the Beidou antenna arm 10 and is connected in series with the phase modulation unit 20. It is turned on when the Beidou feed source 30 is in a working state and disconnected when the Beidou feed source 30 is in a non-working state. The first short-circuit branch 50 is respectively connected to the first switch 40 and the antenna reference ground. When the Beidou feed source 30 is in a non-working state, the Beidou feed source 30 is connected to the antenna reference ground through the first short-circuit branch 50.

[0040] The isolation adjustment unit 90 includes a switch SW5, and SW5 and SW2 can jointly implement the isolation adjustment between the top antennas.

[0041] Also, see Figure 3 , the unit B (corresponding to the dotted box in the figure) composed of the phase adjustment unit 20, the Beidou feed source 30 and the first switch branch is on the right side of the isolation adjustment unit 90, which is an application scenario. In actual applications, the positions can also be interchanged, that is, the unit B is on the left side of the isolation adjustment unit 90, and the function remains unchanged, which will not be repeated here.

[0042] In the embodiment of the present application, the transmitting antenna and the receiving antenna of the Beidou antenna share the Beidou antenna arm 10, such as the cantilever structure at the top in the figure, with a break on each side. The left and right sides of the Beidou antenna arm 10 are respectively coupled with the first radiation branch 61 and the second radiation branch 62 break. The first radiation branch 61 on the left is connected to the GPS-WIFI feed 1 for gain auxiliary adjustment, and the second radiation branch 62 on the right is connected to the MHB feed 2 for gain auxiliary adjustment. When the Beidou feed 30 is in working state, the first radiation branch 61 and the second radiation branch 62 are both grounded, specifically, they can be grounded through switches and short-circuit branches, which will not be repeated here.

[0043] In an embodiment of the present application, the Beidou antenna arm 10 can also be connected to a cellular feed 3 through a second switch branch, and the second switch branch includes: a second switch 70 and a tuning branch 80. Among them, the second switch 70 is shown as SW3 in the figure, and the tuning branch 80 is two devices on the left side below SW3. The second switch 70 is connected to the cellular feed 3 and the second feeding point 22 on the Beidou antenna arm, respectively, and is turned on when the cellular feed 3 is in a working state, and is disconnected when the cellular feed 3 is in a non-working state. The tuning branch 80 is connected to the second switch 70 and the antenna reference ground, respectively, and is used to perform tuning switching of different frequency bands when the cellular feed 3 is in a working state.

[0044] The above-mentioned Beidou antenna provided in the embodiment of the present application adjusts the impedance phase of the Beidou antenna's transmitting frequency band and the impedance phase of the receiving frequency band to the same phase zone through the phase adjustment unit, which can reduce the phase difference between the maximum radiation direction of the Beidou antenna and the maximum radiation direction of the Beidou antenna, improve the phase alignment effect, and thus improve the communication quality of the satellite signal. By adjusting the isolation between the Beidou antenna and other antennas through the isolation adjustment unit, better antenna efficiency can be obtained and interference between different antennas can be reduced.

[0045] Figure 4 FIG. 2 shows another Beidou antenna structure schematic diagram provided in an embodiment of the present application. Figure 4 As shown, the Beidou antenna includes: The Beidou antenna arm 10 is a cantilever structure.

[0046] The phase adjustment unit 20 is connected to the first feeding point 11 on the Beidou antenna arm 10, and is used to adjust the impedance phase of the Beidou antenna's transmitting frequency band and the impedance phase of the receiving frequency band to the same phase region.

[0047] The Beidou feed source 30 is connected in series with the phase modulation unit 20 and is used to communicate with the satellite system.

[0048] The transmitting antenna and receiving antenna of the Beidou antenna share the Beidou antenna arm 10 .

[0049] Among them, the two ends of the Beidou antenna arm 10 respectively have a break at the first breakpoint 33 and the second breakpoint 44, the first feed point 11 is adjacent to the first breakpoint 33 (the breakpoint on the right side of the figure), and the Beidou antenna arm 10 also has a third point 55, the third point 55 is adjacent to the second breakpoint 44 (the breakpoint on the left side of the figure), and the third point 55 is grounded.

[0050] In the embodiment of the present application, the distance between the first feeding point 11 and the first breakpoint 33 can be set as needed, such as 12 mm, etc., and is not specifically limited.

[0051] In one implementation manner, the grounding of the third point 55 may include capacitor grounding or weak inductive grounding.

[0052] In the embodiment of the present application, the left and right sides of the Beidou antenna arm 10 are respectively coupled with the first radiation branch 61 and the second radiation branch 62, the first radiation branch 61 is connected to the GPS-WIFI feed source 1 for auxiliary gain adjustment, and the second radiation branch 62 is connected to the MHB feed source 2 for auxiliary gain adjustment. When the Beidou feed source 30 is in working state, the first radiation branch 61 and the second radiation branch 62 are both grounded.

[0053] The above-mentioned Beidou antenna provided in the embodiment of the present application adjusts the impedance phase of the Beidou antenna transmitting frequency band and the impedance phase of the receiving frequency band to the same phase zone through the phase adjustment unit, which can reduce the phase difference between the maximum radiation direction of the Beidou antenna and the maximum radiation direction of the Beidou antenna, improve the phase alignment effect, and thus improve the communication quality of the satellite signal. In addition, the third point capacitor grounding or weak inductive grounding on the Beidou antenna arm can reduce the influence of the switch Coff, thereby improving the radiation performance of the left GPS-WIFI feed source, especially the radiation efficiency of the WIFI5G antenna, and can also improve the downlink right-hand circular polarization component, and reduce the influence on the uplink left-hand circular polarization component.

[0054] The phase adjustment unit in the embodiment of the present application is described in detail below. In each of the above embodiments, the phase adjustment unit may adopt an LC parallel resonant structure. The LC parallel resonant structure exhibits inductive characteristics at the center frequency of the transmitting antenna and capacitive characteristics at the center frequency of the receiving antenna.

[0055] Figure 5 A schematic diagram of the Beidou antenna input impedance provided in an embodiment of the present application is shown. Among them, the center frequency of the Beidou antenna TX is 1615MHz, and the center frequency of the Beidou antenna RX is 2491MHz, and the frequency ratio thereof reaches 1.54 times. By using an LC parallel resonant structure, the phases of the TX and RX frequency band impedances are adjusted respectively, so that the phases of the TX and RX impedances can be in the same phase zone, such as the phase difference can be controlled within 10°. In this way, the far-field maximum gain area is in the same direction, which effectively increases the communication area area, which can be increased by more than 50%, thereby improving the satellite communication efficiency.

[0056] In one implementation, the LC parallel resonant structure may be implemented using an inductor L of 2.7 nH and a capacitor C of 2.7 pF. Figure 6 The schematic diagram of the inductance and capacitance characteristics of the parallel resonant structure provided in the embodiment of the present application is shown. Among them, the LC parallel resonant structure presents inductance characteristics at 1615MHz and capacitance characteristics at 2491MHz, which can achieve a good standing wave ratio of less than 1.2, eliminate the phase difference between TX and RX, achieve the same phase in the far field optimal area, and effectively increase the coverage area of ​​the communication area.

[0057] Figure 7A schematic diagram of the test results of the directional pattern of the Beidou antenna provided in an embodiment of the present application is shown. Among them, after the network impedance matching is performed through the LC parallel resonance result, the impedance phase of the Beidou antenna transmitting frequency band and the impedance phase of the receiving frequency band can be adjusted to the same phase zone, which can reduce the phase difference between the maximum radiation direction of the Beidou antenna and the maximum radiation direction of the reception, and improve the phase alignment effect. It can be clearly seen from the figure that there is a large overlap between the maximum radiation direction of the antenna transmission and the maximum radiation direction of the reception. Exemplarily, the parameters of the far-field direction can be as follows: The optimal area of ​​the Beidou antenna's uplink left-hand circular polarization and downlink right-hand circular polarization is θ≤30°, φ∈[90°, 140°]&φ∈[280°, 330°], and good radiation of the signal is achieved.

[0058] In the embodiment of the present application, the maximum gain areas of the Beidou antenna TX and RX can both cover the 30° area of ​​the dome, and the satellite can provide direct signal coverage. Therefore, the satellite mobile terminal establishes a good physical connection with the satellite, thereby ensuring communication reliability and timeliness.

[0059] Figure 8 FIG. 1 shows a schematic diagram of the structure of a satellite mobile terminal provided in an embodiment of the present application. Figure 8 As shown, the satellite mobile terminal 800 includes: the Beidou antenna 801 described in any of the above embodiments, and the Beidou antenna 801 is located at the top of the satellite mobile terminal.

[0060] The Beidou antenna in this embodiment can realize the functions of the Beidou antenna provided in any of the above embodiments. For detailed processes, please refer to the description in the above embodiments, which will not be repeated here.

[0061] The satellite mobile terminal provided in the embodiment of the present application adjusts the impedance phase of the Beidou antenna's transmitting frequency band and the impedance phase of the receiving frequency band to the same phase zone through a phase adjustment unit, which can reduce the phase difference between the maximum radiation direction of the Beidou antenna and the maximum radiation direction of the Beidou antenna, improve the phase alignment effect, and thereby improve the communication quality of the satellite signal.

[0062] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0063] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0064] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A Beidou antenna, characterized in that: include: Beidou antenna arm is a cantilever structure; A phase adjustment unit, connected to the first feeding point on the Beidou antenna arm, used to adjust the impedance phase of the Beidou antenna transmitting frequency band and the impedance phase of the receiving frequency band to the same phase zone; A Beidou feed source, connected in series with the phase modulation unit, for communicating with a satellite system; Among them, the transmitting antenna and receiving antenna of the Beidou antenna share the Beidou antenna arm.

2. The Beidou antenna according to claim 1, characterized in that: Also includes: A first switch, connected to a first feed point on the Beidou antenna arm and connected in series with the phase modulation unit, is turned on when the Beidou feed source is in a working state, and is turned off when the Beidou feed source is in a non-working state; The first short-circuit branch is respectively connected to the first switch and the antenna reference ground. When the Beidou feed source is in a non-working state, the Beidou feed source is connected to the antenna reference ground through the first short-circuit branch.

3. The Beidou antenna according to claim 1, characterized in that: The left and right sides of the Beidou antenna arm are respectively coupled with the first radiation branch and the second radiation branch, the first radiation branch is connected to a global positioning system-wireless fidelity GPS-WIFI feed for auxiliary gain adjustment, and the second radiation branch is connected to a medium and high frequency band MHB feed for auxiliary gain adjustment; when the Beidou feed is in working state, the first radiation branch and the second radiation branch are both grounded.

4. The Beidou antenna according to claim 1, characterized in that: The Beidou antenna arm is also connected to a cellular feed source, and the Beidou antenna also includes: A second switch is connected to the cellular feed and the second feeding point on the Beidou antenna arm, respectively, is turned on when the cellular feed is in a working state, and is turned off when the cellular feed is in a non-working state; The tuning branch is connected to the second switch and the antenna reference ground respectively, and is used to perform tuning switching of different frequency bands when the cellular feed source is in an operating state.

5. The Beidou antenna according to claim 1, characterized in that: The Beidou antenna arm is also connected to an isolation adjustment unit, and the isolation adjustment unit is used to adjust the isolation between the Beidou antenna and other antennas.

6. The Beidou antenna according to claim 1, characterized in that: The two ends of the Beidou antenna arm have a break at the first breakpoint and the second breakpoint respectively, the first feeding point is adjacent to the first breakpoint, and the Beidou antenna arm also has a third point, the third point is adjacent to the second breakpoint, and the third point is grounded.

7. The Beidou antenna according to claim 6, characterized in that: The third point grounding includes capacitor grounding or weak inductive grounding.

8. The Beidou antenna according to claim 1, characterized in that: The phase modulation unit adopts an LC parallel resonance structure, and the LC parallel resonance structure presents an inductance characteristic at the center frequency point of the transmitting antenna and a capacitance characteristic at the center frequency point of the receiving antenna.

9. The Beidou antenna according to claim 1, characterized in that: The in-phase phase zone is a region where the phase difference is within 30° of the dome.

10. A satellite mobile terminal, characterized in that: It comprises the Beidou antenna as described in any one of claims 1 to 9, and the Beidou antenna is located on the top of the satellite mobile terminal.

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