Feed circuit, circuit, positioning system and vehicle
By introducing a power divider and phase adjustment component into the circular polarization feed circuit, the problem of high phase instability in the prior art is solved, and better antenna circular polarization effect and directional pattern optimization are achieved.
Patent Information
- Application Number
- CN202411391540.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-04-08
AI Technical Summary
The existing circular polarization feed circuit has a high phase instability, which leads to an increase in the antenna axis ratio and deteriorates the circular polarization effect.
By introducing a power divider into the feed circuit, the signal is divided into two signals, reducing the use of the phase shifter, and using the cooperation of the phase adjustment component and the microstrip line, ensuring that the phase difference of the signal at different ports is 90°.
The phase instability of the feeding circuit is reduced, the circular polarization effect of the antenna is improved, and the directional map is optimized.
Smart Images
Figure CN119786956A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of antenna feeding technology, and in particular to a feeding circuit, a circuit, a positioning system and a vehicle. Background Art
[0002] The Global Navigation Satellite System (GNSS) is an air-based radio navigation and positioning system that can provide users with all-weather three-dimensional coordinates, speed and time at any location on the Earth's surface or in near-Earth space. It is increasingly widely used in people's daily lives. The antenna in the Global Navigation Satellite System uses a circularly polarized antenna, which requires the use of a circularly polarized feed circuit in the RF front end.
[0003] The circular polarization feeding circuit in the related art has a high phase instability. Summary of the invention
[0004] An embodiment of the present application provides a feeding circuit, which reduces the phase instability of the feeding circuit, so as to at least partially solve the above technical problems.
[0005] In order to achieve the above object, according to a first aspect of the present application, a feeding circuit is provided, comprising:
[0006] Power divider;
[0007] The first circuit and the second circuit are both connected to one end of the power divider;
[0008] The first circuit includes a first phase shifter, a first port and a second port, wherein the first port and the second port are both connected to the power divider through the first phase shifter;
[0009] The second circuit includes a phase adjustment component, a third port and a fourth port, and the third port and the fourth port are both connected to the power divider through the phase adjustment component;
[0010] Phases of signals at the first port, the second port, the third port, and the fourth port differ by 90° respectively.
[0011] Optionally, the phase adjustment component includes a second phase shifter and a phase adjustment component, the third port is connected to the power divider through the second phase shifter and the phase adjustment component, and the fourth port is connected to the power divider through the second phase shifter and the phase adjustment component.
[0012] Optionally, the third port and the fourth port are both connected to one end of the second phase shifter, and the other end of the second phase shifter is connected to the power divider through the phase adjustment component.
[0013] Optionally, the phase adjustment component includes at least two phase adjustment components, the third port is connected to one end of the second phase shifter through one of the phase adjustment components, the fourth port is connected to one end of the second phase shifter through another phase adjustment component, and the other end of the second phase shifter is connected to the power divider.
[0014] Optionally, the first phase shifter and the second phase shifter are both 90° power division phase shifters, and the phase adjustment element is used to adjust the phase difference between the output signal of the phase adjustment element and the input signal of the phase adjustment element to 180°.
[0015] Optionally, the phase adjustment element includes a 180° microstrip line.
[0016] Optionally, the feeding circuit further includes a first microstrip line and a second microstrip line, the first port is connected to the first phase shifter through the first microstrip line, the second port is connected to the first phase shifter through the second microstrip line, and the first microstrip line and the second microstrip line are equal in length.
[0017] Optionally, the feeding circuit further includes a third microstrip line and a fourth microstrip line, the third port is connected to the phase adjustment component through the third microstrip line, the fourth port is connected to the phase adjustment component through the fourth microstrip line, and the length of the third microstrip line is the same as that of the fourth microstrip line.
[0018] Optionally, the feeding circuit also includes a fifth microstrip line and a sixth microstrip line, the first phase shifter is connected to the power divider through the fifth microstrip line, the phase adjustment component is connected to the power divider through the sixth microstrip line, the lengths of the fifth microstrip line and the sixth microstrip line are equal, and the lengths of the first microstrip line and the third microstrip line are equal.
[0019] Optionally, the feeding circuit also includes a power regulating module, which is connected between the power divider and the first phase shifter, and is used to adjust the signal power so that the power of the signals at the first port, the second port, the third port and the fourth port are the same, or the power of the signal transmitted to the power divider via the first phase shifter is the same as the power of the signal transmitted to the power divider via the phase adjustment component.
[0020] Optionally, the first port and the second port are symmetrically distributed about the first phase shifter; and / or,
[0021] The third port and the fourth port are symmetrically distributed about the second phase shifter; and / or,
[0022] The first port and the third port are symmetrically distributed about the power divider; and / or,
[0023] The second port and the fourth port are symmetrically distributed about the power divider; and / or,
[0024] The first phase shifter and the second phase shifter are symmetrically distributed with respect to the power divider.
[0025] According to a second aspect of the present application, a circuit is further provided, comprising at least two feeding circuits as described above, wherein one of the feeding circuits is used to transmit a high-frequency signal, and the other feeding circuit is used to transmit a low-frequency signal.
[0026] According to a third aspect of the present application, a positioning system is also provided, comprising a processor and the feeding circuit as described above or the circuit as described above, wherein the power divider is connected to the processor
[0027] According to a fourth aspect of the present application, a vehicle is also provided, comprising the positioning system as described above.
[0028] In the feeding circuit of the embodiment of the present application, when the feeding circuit is used to transmit a signal, the signal enters the power divider, and the power divider divides the signal into two signals with the same phase and power, wherein one signal is divided into a first signal and a second signal with a phase difference after passing through a first phase shifter, the first signal is transmitted to a first port, and the second signal is transmitted to a second port, and the other signal is divided into a third signal and a fourth signal with a phase difference after passing through a phase adjustment component, the third signal is transmitted to a third port, and the fourth signal is transmitted to a fourth port, and finally signals with phases differing by 90° are obtained at the first port, the second port, the third port, and the fourth port, respectively. The present application reduces the use of phase shifters by using a power divider to divide the signal into two signals, thereby reducing the phase instability of the feeding circuit. Feeding an antenna using the feeding circuit of the present application can reduce the antenna axial ratio and improve the circular polarization effect of the antenna;
[0029] When the feeding circuit is used to receive signals, the first port, the second port, the third port and the fourth port are all used to receive signals, and the phase differences of the signals at the first port, the second port, the third port and the fourth port are 90° apart respectively. The signals at the first port and the second port are both transmitted to the first phase shifter, which combines the signals of the first port and the second port into one signal and transmits it to the power divider. The signals at the third port and the fourth port are both transmitted to the phase adjustment component, which combines the signals of the third port and the fourth port into another signal and transmits it to the power divider. The power divider combines the two signals into one signal and transmits it to the processor to receive the signal. The present application combines the two signals into one signal by using a power divider, thereby reducing the use of the phase shifter and reducing the phase instability of the feeding circuit. By feeding the antenna with the feeding circuit of the present application, the antenna axial ratio can be reduced, the circular polarization effect of the antenna can be improved, and it will also be beneficial to optimize the radiation pattern when used to locate the antenna.
[0030] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.
[0032] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.
[0033] Figure 1 is one of the circuit diagrams of a feeding circuit provided in an exemplary embodiment of the present disclosure;
[0034] Figure 2 is a second circuit diagram of a feeding circuit provided in an exemplary embodiment of the present disclosure;
[0035] Figure 3 is one of the circuit diagrams of the circuit provided in the exemplary embodiment of the present disclosure;
[0036] Figure 4 This is a second circuit diagram of a circuit provided in an exemplary embodiment of the present disclosure.
[0037] Description of reference numerals:
[0038] 1. Power divider; 2. First circuit; 3. Second circuit; 4. First microstrip line; 5. Second microstrip line; 6. Third microstrip line; 7. Fourth microstrip line; 8. Power regulation module; 21. First phase shifter; 22. First port; 23. Second port; 31. Phase adjustment component; 32. Third port; 33. Fourth port; 311. Second phase shifter; 312. Phase adjustment component. DETAILED DESCRIPTION
[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0040] According to the first aspect of this application, see Figure 1 and Figure 2 The present disclosure provides a feeding circuit. The feeding circuit includes a power divider 1, a first circuit 2 and a second circuit 3, wherein the first circuit 2 and the second circuit 3 are both connected to one end of the power divider 1.
[0041] The first circuit 2 includes a first phase shifter 21 , a first port 22 and a second port 23 . The first port 22 and the second port 23 are both connected to the power divider 1 through the first phase shifter 21 .
[0042] The second circuit 3 includes a phase adjustment component 31 , a third port 32 and a fourth port 33 . The third port 32 and the fourth port 33 are both connected to the power divider 1 through the phase adjustment component 31 .
[0043] The phases of the signals at the first port 22 , the second port 23 , the third port 32 , and the fourth port 33 differ by 90° respectively.
[0044] It can be understood that when the feeding circuit is used to transmit a signal, the signal enters the power divider 1, and the power divider 1 divides the signal into two signals with the same phase and power, one of which is divided into a first signal and a second signal with a phase difference after passing through the first phase shifter 21, and the first signal is transmitted to the first port 22, and the second signal is transmitted to the second port 23. The other signal is divided into a third signal and a fourth signal with a phase difference after passing through the phase adjustment component 31, and the third signal is transmitted to the third port 32, and the fourth signal is transmitted to the fourth port 33. Finally, signals with phases that differ by 90° are obtained at the first port 22, the second port 23, the third port 32 and the fourth port 33. The present application reduces the use of phase shifters by using a power divider 1 to divide the signal into two signals, thereby reducing the phase instability of the feeding circuit. Feeding the antenna using the feeding circuit of the present application can reduce the antenna axial ratio and improve the circular polarization effect of the antenna.
[0045] It can be understood that when the feeding circuit is used to receive signals, the first port 22, the second port 23, the third port 32 and the fourth port 33 are all used to receive signals, and the phase differences of the signals at the first port 22, the second port 23, the third port 32 and the fourth port 33 are 90° apart respectively. The signals at the first port 22 and the second port 23 are both transmitted to the first phase shifter 21, and the first phase shifter 21 combines the signals of the first port 22 and the second port 23 into one signal and transmits it to the power divider 1. The signals at the third port 32 and the fourth port 33 are both transmitted to the phase adjustment component 31, and the phase adjustment component 31 combines the signals of the third port 32 and the fourth port 33 into another signal and transmits it to the power divider 1. The power divider 1 combines the two signals into one signal and transmits it to the processor to realize the reception of the signal. The present application reduces the use of phase shifters by combining the two signals into one signal using the power divider 1, thereby reducing the phase instability of the feeding circuit. Using the feeding circuit of the present application to feed the antenna can reduce the antenna axial ratio, improve the circular polarization effect of the antenna, and is also beneficial for optimizing the radiation pattern when used to position the antenna.
[0046] In the feeding circuit in the related technology, taking the transmitting signal as an example, the signal is divided into two signals through a 90° power splitter phase shifter. In order to obtain four signals with phases that differ by 90° in sequence, at least one 90° power splitter phase shifter needs to be connected in series after the 90° phase shifter. The phase shifter itself has phase imbalance, and the two-stage series connection will increase the uncertainty of the circuit phase error, which will lead to an increase in the antenna axial ratio and a deterioration in the circular polarization effect. The present application uses a power splitter 1 to replace the 90° power splitter phase shifter, so that the phase instability is reduced, which is beneficial to reducing the antenna axial ratio and improving the circular polarization effect.
[0047] In some examples, the phase of the signal transmitted to the first phase shifter 21 and the phase adjustment component 31 through the power divider 1 is -ɑ, the phase of the signal at the first port 22 is -ɑ, the phase of the signal at the second port 23 is -ɑ-90°, the phase of the signal at the third port 32 is -ɑ-180°, and the phase of the signal at the fourth port 33 is -ɑ-270°.
[0048] In some examples, the phases of the signals at the first port 22 and the second port 23 may differ by 90° using only the first phase shifter 21. Since the microstrip line changes the phase of the signal, the first phase shifter 21 combined with the length from the first port 22 to the first phase shifter 21 and the first phase shifter 21 combined with the length from the second port 23 to the first phase shifter 21 may also be used to make the phases of the signals at the first port 22 and the second port 23 differ by 90°.
[0049] In some embodiments, see Figure 1 The phase adjustment component 31 includes a second phase shifter 311 and a phase adjustment component 312 , the third port 32 is connected to the power divider 1 through the second phase shifter 311 and the phase adjustment component 312 , and the fourth port 33 is connected to the power divider 1 through the second phase shifter 311 and the phase adjustment component 312 .
[0050] It is understandable that the phase adjustment element 312 can shift the phase of the signal, and a signal with a desired phase can be obtained by using the phase adjustment element 312 in conjunction with the second phase shifter 311 .
[0051] It is understandable that the signal may first pass through the second phase shifter 311 or first pass through the phase adjustment element 312 .
[0052] In some examples, when a signal is transmitted, when the signal is transmitted to the phase adjustment component 31, the signal is divided into two signals with a phase difference when passing through the second phase shifter 311, and the signal is phase-shifted when passing through the phase adjustment component 312, thereby achieving a two-stage adjustment of the phase of the signal, and finally a signal with a phase of -ɑ-180° is obtained at the third port 32, and a signal with a phase of -ɑ-270° is obtained at the fourth port 33.
[0053] In some examples, when receiving a signal, the signal is merged into one signal when passing through the second phase shifter 311, and the phase of the signal changes when passing through the phase adjustment element 312. Through the cooperation of the second phase shifter 311 and the phase adjustment element 312, the phase of the signal transmitted to the power divider 1 via the phase adjustment component 31 can be made the same as the phase of the signal transmitted to the power divider 1 via the first phase shifter 21.
[0054] In some embodiments, see Figure 1The third port 32 and the fourth port 33 are both connected to one end of the second phase shifter 311 , and the other end of the second phase shifter 311 is connected to the power divider 1 through the phase adjustment element 312 .
[0055] It can be understood that the third port 32, the second phase shifter 311 and the phase adjustment element 312 form a signal transmission channel, so that when the signal is transmitted between the third port 32 and the power divider 1, it will pass through the second phase shifter 311 and the phase adjustment element 312. The fourth port 33, the second phase shifter 311 and the phase adjustment element 312 form a signal transmission channel, so that when the signal is transmitted between the fourth port 33 and the power divider 1, it will pass through the second phase shifter 311 and the phase adjustment element 312. This embodiment realizes the sharing of the phase adjustment element 312 and simplifies the structure of the feeding circuit.
[0056] Exemplarily, when transmitting a signal, the signal is divided into two signals with a phase of -ɑ by the power divider 1. One signal is transmitted to the first phase shifter 21, and the other signal is transmitted to the phase adjustment element 312. The phase adjustment element 312 causes the phase of the other signal to be shifted to -ɑ-180°. The -ɑ-180° signal is transmitted to the second phase shifter 311. The second phase shifter 311 divides the signal into a -ɑ-180° signal and a -ɑ-270° signal, so as to obtain a -ɑ-180° signal at the third port 32 and a -ɑ-270° signal at the fourth port 33.
[0057] In some embodiments, see Figure 2 The phase adjustment component 31 includes at least two phase adjustment components 312, the third port 32 is connected to one end of the second phase shifter 311 through one of the phase adjustment components 312, the fourth port 33 is connected to one end of the second phase shifter 311 through another phase adjustment component 312, and the other end of the second phase shifter 311 is connected to the power divider 1.
[0058] It can be understood that the third port 32, one of the phase adjustment components 312 and the second phase shifter 311 form a signal transmission channel, so that when the signal is transmitted between the third port 32 and the power divider 1, it will first pass through the second phase shifter 311 and one of the phase adjustment components 312 to adjust the phase of the signal. The fourth port 33, another phase adjustment component 312 and the second phase shifter 311 form a signal transmission channel, so that when the signal is transmitted between the fourth port 33 and the power divider 1, it will pass through the second phase shifter 311 and the phase adjustment component 312 to adjust the phase of the signal. In this embodiment, the phase adjustment component 312 connected to the third port 32 and the phase adjustment component 312 connected to the fourth port 33 are respectively independent. When the phase adjustment component 312 connected to one of the third port 32 and the fourth port 33 fails, it will not affect the other of the third port 32 and the fourth port 33.
[0059] Exemplarily, when transmitting a signal, the signal is divided into two signals with a phase of -ɑ by the power divider 1, one signal is transmitted to the first phase shifter 21, and the other signal is transmitted to the second phase shifter 311. The second phase shifter 311 divides the signal into a signal with a phase of -ɑ and a signal with a phase of -ɑ-90°. The signal with a phase of -ɑ is converted into a signal with a phase of -ɑ-180° after passing through one of the phase adjustment components 312, and the signal with a phase of -ɑ-90° is converted into a signal with a phase of -ɑ-270° after passing through another phase adjustment component 312, so as to obtain a signal with a phase of -ɑ-180° at the third port 32 and a signal with a phase of -ɑ-270° at the fourth port 33.
[0060] In some embodiments, the first phase shifter 21 and the second phase shifter 311 are both 90° power division phase shifters, and the phase adjustment element 312 is used to adjust the phase difference between the output signal of the phase adjustment element 312 and the input signal of the phase adjustment element 312 to 180°.
[0061] It can be understood that when transmitting a signal, the signal is divided into two signals with a phase of -ɑ by the power divider 1, one signal is transmitted to the first phase shifter 21, and the other signal is transmitted to the second phase shifter 311. Among them, one signal is divided into a signal with a phase of -ɑ and a signal with a phase of -ɑ-90° under the action of the first phase shifter 21, so that a signal with a phase of -ɑ is obtained at the first port 22, and a signal with a phase of -ɑ-90° is obtained at the second port 23; the other signal is converted into a signal with a phase of -ɑ-180° under the action of the phase adjustment element 312, and the signal with a phase of -ɑ-180° is converted into a signal with a phase of -ɑ-180° and a signal with a phase of -ɑ-90° under the action of the second phase shifter 311. The other signal can also pass through the second phase shifter 311 and be divided into a signal with a phase of -ɑ and a signal with a phase of -ɑ-90°. Then the signal with a phase of -ɑ and the signal with a phase of -ɑ-90° pass through the phase adjustment element 312 and become a signal with a phase of -ɑ-180° and a signal with a phase of -ɑ-270°, so as to obtain a signal with a phase of -ɑ-180° at the third port 32 and a signal with a phase of -ɑ-270° at the fourth port 33.
[0062] When receiving a signal, the signal with a phase of -ɑ at the first port 22 and the signal with a phase of -ɑ-90° at the second port 23 are converted into a signal with a phase of -ɑ after passing through the first phase shifter 21 and transmitted to the power divider 1. The signal with a phase of -ɑ-180° at the third port 32 and the signal with a phase of -ɑ-270° at the fourth port 33 are combined into a signal with a phase of -ɑ-180° after passing through the second phase shifter 311, and the signal with a phase of -ɑ-180° is converted into a signal with a phase of -ɑ after passing through the phase adjustment element 312 and transmitted to the power divider 1. The signal with a phase of -ɑ-180° at the third port 32 and the signal with a phase of -ɑ-270° at the fourth port 33 may also pass through the phase adjustment element 312 first and then pass through the second phase shifter 311. The power divider 1 combines the two signals with a phase of -ɑ into one signal and transmits it to the processor to complete the signal reception.
[0063] In some embodiments, the phase adjustment element 312 includes, for example, a 180° microstrip line.
[0064] In some embodiments, the feeding circuit further includes a first microstrip line 4 and a second microstrip line 5, the first port 22 is connected to the first phase shifter 21 through the first microstrip line 4, the second port 23 is connected to the first phase shifter 21 through the second microstrip line 5, and the lengths of the first microstrip line 4 and the second microstrip line 5 are equal.
[0065] It is understandable that the longer the microstrip line is, the greater the impact on the phase change of the signal. The lengths of the first microstrip line 4 and the second microstrip line 5 are set to be equal, so that the phase change that occurs when the signal is transmitted between the first port 22 and the first phase shifter 21 is the same as the phase change that occurs when the signal is transmitted between the second port 23 and the first phase shifter 21.
[0066] In some embodiments, the feeding circuit also includes a third microstrip line 6 and a fourth microstrip line 7, the third port 32 is connected to the phase adjustment component 31 through the third microstrip line 6, and the fourth port 33 is connected to the phase adjustment component 31 through the fourth microstrip line 7, and the length of the third microstrip line 6 is the same as the length of the fourth microstrip line 7.
[0067] It is understandable that the longer the microstrip line is, the greater the impact on the phase change of the signal. The lengths of the third microstrip line 6 and the fourth microstrip line 7 are set to be equal, so that the phase change of the signal when it is transmitted between the third port 32 and the phase adjustment component 31 is the same as the phase change of the signal when it is transmitted between the fourth port 33 and the phase adjustment component 31.
[0068] In some embodiments, the feeding circuit also includes a fifth microstrip line and a sixth microstrip line, the first phase shifter 21 is connected to the power divider 1 through the fifth microstrip line, the phase adjustment component 31 is connected to the power divider 1 through the sixth microstrip line, the lengths of the fifth microstrip line and the sixth microstrip line are equal, and the lengths of the first microstrip line 4 and the third microstrip line 6 are equal.
[0069] It is understandable that the longer the microstrip line is, the greater the impact on the phase change of the signal. When the signal is transmitted between the first port 22 and the power divider 1, it will pass through the first microstrip line 4 and the fifth microstrip line. When the signal is transmitted between the second port 23 and the power divider 1, it will pass through the second microstrip line 5 and the fifth microstrip line. When the signal is transmitted between the third port 32 and the power divider 1, it will pass through the third microstrip line 6, the phase adjustment component 31 and the sixth microstrip line. When the signal is transmitted between the fourth port 33 and the power divider 1, it will pass through the fourth microstrip line 7, the phase adjustment component 31 and the sixth microstrip line. That is to say, except for the phase adjustment component 31, the phase change caused by the microstrip line when the signal is transmitted between the first port 22 and the power divider 1, the phase change caused by the microstrip line when the signal is transmitted between the second port 23 and the power divider 1, the phase change caused by the microstrip line when the signal is transmitted between the third port 32 and the power divider 1, and the phase change caused by the microstrip line when the signal is transmitted between the fourth port 33 and the power divider 1 are all the same, and thus the first phase shifter 21 and the phase adjustment component 31 can be used to accurately adjust the phase difference of the signals at the four ports to avoid the influence of the microstrip line causing the phases of the signals at the first port 22, the second port 23, the third port 32 and the fourth port 33 to not differ by 90° in sequence.
[0070] In some embodiments, the feeding circuit also includes a power regulating module 8, which is connected between the power divider 1 and the first phase shifter 21. The power regulating module 8 is used to adjust the signal power so that the power of the signals at the first port 22, the second port 23, the third port 32 and the fourth port 33 are the same, or the power of the signal transmitted to the power divider 1 via the first phase shifter 21 is the same as the power of the signal transmitted to the power divider 1 via the phase adjustment component 31.
[0071] It can be understood that the power regulating module 8 can regulate the power of the signal transmitted between the first phase shifter 21 and the power divider 1. The length and components of the microstrip line through which the signal passes when it is transmitted between the first port 22 and the power divider 1 are different from the length and components of the microstrip line through which the signal passes when it is transmitted between the third port 32 and the power divider 1. Therefore, the power attenuation that occurs when the signal is transmitted between the first port 22 and the power divider 1 is different from the power attenuation that occurs when the signal is transmitted between the third port 32 and the power divider 1. Through the setting of the power regulating module 8, the power attenuation that occurs when the signal is transmitted between the first port 22 and the power divider 1 can be kept the same as the power attenuation that occurs when the signal is transmitted between the third port 32 and the power divider 1, thereby ensuring the consistency of the feeding power of the four ports and avoiding the reduction of the performance of the composite pattern due to the difference in feeding power.
[0072] Therefore, when transmitting a signal, it can be ensured that the power of the signal at the first port 22, the second port 23, the third port 32 and the fourth port 33 is the same. When receiving a signal, the power of the signal transmitted to the power divider 1 via the first phase shifter 21 can be made the same as the power of the signal transmitted to the power divider 1 via the phase adjustment component 31.
[0073] It can be understood that the power attenuation of the signal when it is transmitted between the first port 22 and the power divider 1 is the same as the power attenuation of the signal when it is transmitted between the second port 23 and the power divider 1. The power attenuation of the signal when it is transmitted between the third port 32 and the power divider 1 is the same as the power attenuation of the signal when it is transmitted between the fourth port 33 and the power divider 1.
[0074] In some embodiments, the first port 22 and the second port 23 are symmetrically distributed with respect to the first phase shifter 21 .
[0075] It is understandable that the symmetrical distribution can make it easier to lay out and connect the PCB, and the symmetry can better control the length of the microstrip line between the first port 22 and the first phase shifter 21 and the length of the microstrip line between the second port 23 and the first phase shifter 21, thereby reducing the phase difference caused by the routing. After the debugging of the link where the first port 22 is located is completed, the link where the second port 23 is located can be debugged with reference to the link where the first port 22 is located, making the debugging of the feeding circuit more convenient.
[0076] In some embodiments, the third port 32 and the fourth port 33 are symmetrically distributed with respect to the second phase shifter 311 .
[0077] It is understandable that the symmetrical distribution can make it easier to lay out and connect the PCB, and the symmetry can better control the length of the microstrip line between the third port 32 and the phase adjustment component 31 and the length of the microstrip line between the fourth port 33 and the phase adjustment component 31, thereby reducing the phase difference caused by the routing. After the debugging of the link where the third port 32 is located is completed, the link where the fourth port 33 is located can be debugged with reference to the link where the third port 32 is located, making the debugging of the feeding circuit more convenient.
[0078] In some embodiments, the first port 22 and the third port 32 are symmetrically distributed with respect to the power divider 1 .
[0079] It is understandable that symmetrical distribution can make it easier to lay out and connect wires when making PCBs.
[0080] In some embodiments, the second port 23 and the fourth port 33 are symmetrically distributed with respect to the power divider 1 .
[0081] It is understandable that symmetrical distribution can make it easier to lay out and connect wires when making PCBs.
[0082] In some embodiments, the first phase shifter 21 and the second phase shifter 311 are symmetrically distributed with respect to the power divider 1 .
[0083] It is understandable that symmetrical distribution can make it easier to lay out and connect wires when making PCBs.
[0084] According to a second aspect of the present application, the present disclosure provides a circuit. Figure 3 and Figure 4 The circuit includes at least two of the above-mentioned feeding circuits, one of which is used to transmit high-frequency signals and the other is used to transmit low-frequency signals.
[0085] It can be understood that by providing at least two feeding circuits, the transmission or reception of signals in different frequency bands can be achieved.
[0086] One of the feeding circuits is used to feed the low-frequency circularly polarized antenna, and the other feeding circuit is used to feed the high-frequency circularly polarized antenna, so as to obtain circularly polarized antennas with low phase error, high power flatness and low axial ratio in two different frequency bands.
[0087] According to a third aspect of the present application, the present disclosure provides a positioning system. The positioning system includes a processor and the above-mentioned feeding circuit or the above-mentioned circuit, and the power divider 1 is connected to the processor.
[0088] It can be understood that the positioning system with the feeding circuit reduces the use of the phase shifter by using the power divider 1 to divide the signal into two signals, so that the phase instability of the feeding circuit is reduced. Using the feeding circuit of the present application to feed the antenna can reduce the antenna axial ratio, improve the circular polarization effect of the antenna, improve the positioning effect, and help optimize the radiation pattern.
[0089] According to a fourth aspect of the present application, the present disclosure provides a vehicle, wherein the vehicle comprises the above-mentioned positioning system.
[0090] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0091] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0092] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.
[0093] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.
Claims
1. A feeding circuit, characterized in that: include: Power divider; The first circuit and the second circuit are both connected to one end of the power divider; The first circuit includes a first phase shifter, a first port and a second port, wherein the first port and the second port are both connected to the power divider through the first phase shifter; The second circuit includes a phase adjustment component, a third port and a fourth port, and the third port and the fourth port are both connected to the power divider through the phase adjustment component; Phases of signals at the first port, the second port, the third port, and the fourth port differ by 90° respectively.
2. The feeding circuit according to claim 1, characterized in that: The phase adjustment component includes a second phase shifter and a phase adjustment component, the third port is connected to the power divider through the second phase shifter and the phase adjustment component, and the fourth port is connected to the power divider through the second phase shifter and the phase adjustment component.
3. The feeding circuit according to claim 2, characterized in that: The third port and the fourth port are both connected to one end of the second phase shifter, and the other end of the second phase shifter is connected to the power divider through the phase adjustment component.
4. The feeding circuit according to claim 2, characterized in that: The phase adjustment component includes at least two phase adjustment components, the third port is connected to one end of the second phase shifter through one of the phase adjustment components, the fourth port is connected to one end of the second phase shifter through another phase adjustment component, and the other end of the second phase shifter is connected to the power divider.
5. The feeding circuit according to claim 2, characterized in that: The first phase shifter and the second phase shifter are both 90° power division phase shifters, and the phase adjustment element is used to adjust the phase difference between the output signal of the phase adjustment element and the input signal of the phase adjustment element to 180°.
6. The feeding circuit according to claim 5, characterized in that: The phase adjustment element includes a 180° microstrip line.
7. The feeding circuit according to any one of claims 1 to 6, characterized in that: The feeding circuit further includes a first microstrip line and a second microstrip line, the first port is connected to the first phase shifter through the first microstrip line, the second port is connected to the first phase shifter through the second microstrip line, and the first microstrip line and the second microstrip line are equal in length.
8. The feeding circuit according to claim 7, characterized in that: The feeding circuit also includes a third microstrip line and a fourth microstrip line, the third port is connected to the phase adjustment component through the third microstrip line, the fourth port is connected to the phase adjustment component through the fourth microstrip line, and the length of the third microstrip line is the same as that of the fourth microstrip line.
9. The feeding circuit according to claim 8, characterized in that: The feeding circuit also includes a fifth microstrip line and a sixth microstrip line, the first phase shifter is connected to the power divider through the fifth microstrip line, the phase adjustment component is connected to the power divider through the sixth microstrip line, the fifth microstrip line and the sixth microstrip line are equal in length, and the first microstrip line and the third microstrip line are equal in length.
10. The feeding circuit according to any one of claims 1 to 6, characterized in that: The feeding circuit also includes a power regulating module, which is connected between the power divider and the first phase shifter. The power regulating module is used to adjust the signal power so that the power of the signals at the first port, the second port, the third port and the fourth port is the same, or the power of the signal transmitted to the power divider via the first phase shifter is the same as the power of the signal transmitted to the power divider via the phase adjustment component.
11. The feeding circuit according to any one of claims 1 to 6, characterized in that: The first port and the second port are symmetrically distributed about the first phase shifter; and / or, The third port and the fourth port are symmetrically distributed about the second phase shifter; and / or, The first port and the third port are symmetrically distributed about the power divider; and / or, The second port and the fourth port are symmetrically distributed about the power divider; and / or, The first phase shifter and the second phase shifter are symmetrically distributed with respect to the power divider.
12. A circuit, characterized in that: The invention comprises at least two feeding circuits according to any one of claims 1 to 11, wherein one of the feeding circuits is used to transmit a high-frequency signal, and the other feeding circuit is used to transmit a low-frequency signal.
13. A positioning system, characterized in that: The method comprises a processor and a feeding circuit as claimed in any one of claims 1 to 11 or a circuit as claimed in claim 12, wherein the power divider is connected to the processor.
14. A vehicle comprising the positioning system according to claim 13.