An antenna feed control method and circuit

Abstract

The application provides an antenna feed control method and circuit, and belongs to the technical field of wireless communication. The method comprises the following steps: receiving a signal strength ratio and a first phase difference between received signals of two feed points of an antenna, wherein the two feed points respectively receive one vertical component of an external signal; determining a power distribution ratio and a second phase difference between transmitted signals of the two feed points according to the signal strength ratio and the first phase difference, wherein the power distribution ratio is the same as the signal strength ratio, and the first phase difference is opposite to the second phase difference; and controlling the transmission power of the two feed points according to the power distribution ratio and the transmission phase of the two feed points according to the second phase difference by using a feed network. The application decomposes the external signal into two vertical components, and dynamically controls the transmission signals of the two antenna units by using the feed network according to the analysis results of the two vertical components, so as to synthesize a signal matched with the external signal, and always keep the antenna polarization loss between the two devices at a minimum.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, in particular to an antenna feed control method and circuit. BACKGROUND

[0002] In wireless communication equipment, an antenna is an important component. When two wireless communication equipments communicate with each other through antennas, if the polarization modes of the two antennas are different, polarization loss will be caused, the communication link attenuation between the equipments will be increased, and the communication effect will be affected.

[0003] In a traditional solution, to reduce the polarization loss of the antennas between the wireless communication equipments, it is required that the polarization modes of the two antennas must be the same when the two equipments communicate with each other. Only when the two antennas with the same polarization mode communicate with each other, the polarization loss is the smallest.

[0004] However, in actual application, even if the polarization modes of the two signals are the same, the polarization loss will still be relatively large due to the polarization relative angle of the two signals and the radiation direction of the signals. SUMMARY

[0005] The present application provides an antenna feed control method and circuit, aiming at solving the problem of large polarization loss of the antennas between the wireless communication equipments.

[0006] In a first aspect, the present application provides an antenna feed control method, applied to a master control unit, comprising:

[0007] receiving a signal strength ratio and a first phase difference between the received signals of two feed points of an antenna, the two feed points receiving a vertical component of an external signal respectively;

[0008] determining a power distribution ratio and a second phase difference between the transmitted signals of the two feed points according to the signal strength ratio and the first phase difference, the power distribution ratio being the same as the signal strength ratio, and the first phase difference being opposite to the second phase difference;

[0009] controlling the transmission power of the two feed points according to the power distribution ratio and controlling the transmission phase of the two feed points according to the second phase difference by using a feed network.

[0010] In an embodiment, the antenna comprises two mutually perpendicular and orthogonal linear polarization antenna units.

[0011] In an embodiment, controlling the transmission power of the two feed points according to the power distribution ratio specifically comprises:

[0012] determining the value of an adjusting element in a power distribution circuit of the feed network according to the power distribution ratio;

[0013] The adjusting element is controlled to adjust the value so that the ratio of the output powers between the two output ends of the feeding network is the same as the power distribution ratio between the feeding points connected by the two output ends of the feeding network.

[0014] Each output end of the power distribution circuit is connected with an output end of the feeding network, and each output end of the feeding network is connected with a feeding point.

[0015] In an embodiment, the method of controlling the transmitting powers of the two feeding points according to the power distribution ratio further comprises:

[0016] When the power distribution ratio is the first ratio, the first leg and the third leg of the double-pole double-throw switch of the feeding network are controlled to be conductive, and the second leg and the fourth leg of the double-pole double-throw switch are controlled to be conductive, so that the ratio of the output powers of the two output ends of the power distribution circuit is the power distribution ratio;

[0017] When the power distribution ratio is the second ratio, the first leg and the fourth leg of the double-pole double-throw switch are controlled to be conductive, and the second leg and the third leg of the double-pole double-throw switch are controlled to be conductive, so that the ratio of the output powers of the two output ends of the power distribution circuit is the inverse of the power distribution ratio;

[0018] The first leg of the double-pole double-throw switch is connected with the output end of the first power adjusting module, the second leg of the double-pole double-throw switch is connected with the output end of the second power adjusting module, the third leg of the double-pole double-throw switch is connected with the output end of the feeding network corresponding to the first feeding point, and the fourth leg of the double-pole double-throw switch is connected with the output end of the feeding network corresponding to the second feeding point. One of the first ratio and the second ratio is greater than 1, and the other is less than 1.

[0019] In a second aspect, the application further provides an antenna feeding control circuit, comprising a radio frequency system, a main control unit and a feeding network.

[0020] The two signal detection ends of the radio frequency system are connected with the two feeding points of the antenna respectively, and the signal output end of the radio frequency system is connected with the main control unit. The radio frequency system is used to determine the signal strength ratio and the first phase difference between the received signals of the two feeding points, and the two feeding points respectively receive one of the vertical components of the external signals.

[0021] The input end of the feeding network is in communication connection with the radio frequency system. The feeding network comprises a power distribution circuit and a phase shifter. The power distribution circuit comprises two parallel power adjusting modules. The first end of each power adjusting module is connected with the input end of the power distribution circuit, and the second end of each power adjusting module is an output end of the power distribution circuit. Each output end of the power distribution circuit is connected with an output end of the feeding network respectively, and each output end of the feeding network is connected with a feeding point. The phase shifter is arranged between one of the output ends of the power distribution circuit and the output end of the corresponding feeding network.

[0022] The main control unit is connected with the phase shifter and the adjusting units of the two power adjusting modules respectively.

[0023] In an embodiment, the power adjusting module comprises a first adjusting element and a second adjusting element connected with the input end of the power distribution circuit respectively, the other end of the first adjusting element is grounded, and the other end of the second adjusting element is one output end of the power distribution circuit.

[0024] In an embodiment, the first adjusting element is a first adjusting capacitor.

[0025] In an embodiment, the second adjusting element is one of the following:

[0026] an adjusting inductor;

[0027] a fixed inductor and a second adjusting capacitor in parallel;

[0028] a fixed inductor and a third adjusting capacitor in series.

[0029] In an embodiment, the two output ends of the power distribution circuit are connected with the two input pins of the double-pole double-throw switch respectively, and the two output pins of the double-pole double-throw switch are connected with the two output ends of the feed network respectively.

[0030] In an embodiment, the two signal detection ends of the radio frequency system are connected with the two feed points through directional couplers respectively, the first pin of the directional coupler is connected with the feed point, the second pin of the directional coupler is connected with one output end of the power distribution circuit, the third pin of the directional coupler is connected with one signal detection end of the radio frequency system, and the fourth pin of the directional coupler is connected with the load; the first pin of the directional coupler and the second pin of the directional coupler are through pins. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0032] Figure 1 is one of the flowcharts of the antenna feed control method provided by the application;

[0033] Figure 2 is another flowchart of the antenna feed control method provided by the application;

[0034] Figure 3 is a schematic diagram of the relationship between the antenna gain direction and polarization;

[0035] Figure 4 is one of the schematic diagrams of elliptical polarization of the electric field direction of the transceiving electromagnetic wave of the antenna;

[0036] Figure 5 is one of the schematic diagrams of circular polarization of the electric field direction of the transceiving electromagnetic wave of the antenna;

[0037] Figure 6 is one of the schematic diagrams of linear polarization of the electric field direction of the transceiving electromagnetic wave of the antenna;

[0038] Figure 7 is one of the schematic diagrams of the antenna feed control circuit provided by the present application;

[0039] Figure 8 is one of the schematic diagrams of the microstrip antenna of two perpendicular orthogonal modes provided by the present application;

[0040] Figure 9 is one of the structural schematic diagrams of the second adjusting element provided by the present application;

[0041] Figure 10 is the second structural schematic diagram of the adjusting element provided by the present application. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work fall within the protection scope of the present application.

[0043] It should be noted that, in the description of the present application, the terms “comprise”, “contain” or any other variants thereof are intended to cover the non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes the elements inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement “comprises a” does not exclude the presence of another same element in the process, method, article or equipment including the element.

[0044] The terms "first", "second", and the like in the present application are used to distinguish similar objects, and are not used to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" means at least one of the connected objects, and " / " generally means that the front and rear associated objects are in an "or" relationship.

[0045] Antennas can be divided into linear polarization and circular polarization antennas according to polarization methods. Linear polarization antennas are divided into vertical linear polarization antennas and horizontal linear polarization antennas according to the direction of their electric field vectors. Circular polarization antennas are divided into left-handed circular polarization antennas and right-handed circular polarization antennas according to the direction of their electric field vectors.

[0046] In practical applications, as shown in Figure 3 only in the maximum gain radiation direction (main radiation direction) of the antenna polarization method can a relatively good polarization performance be designed; in other radiation directions, the polarization performance will be greatly reduced. For example, in the maximum gain direction of a linear polarization antenna, the polarization performance can be very good, and the axial ratio is very large (the axial ratio is a parameter reflecting the polarization performance of the antenna, the larger the axial ratio, the closer the antenna to the linear polarization antenna, and the smaller the axial ratio, the closer the antenna to the circular polarization antenna). In directions deviating from the maximum gain radiation direction of the antenna, the polarization performance will be significantly deteriorated, and the axial ratio will be reduced. Moreover, even if the polarization methods of the two signals are the same, only when the polarization angles of the two signals correspond, the communication effect will be better. Therefore, when two devices communicate, as the polarization relative angle between the two signals increases, the polarization loss of the antenna will gradually increase, affecting the communication effect between the two wireless devices.

[0047] Therefore, even if the polarization methods of the two signals are the same, the polarization loss will still be large, which will be affected by the radiation direction of the signal itself and the polarization relative angle of the two signals.

[0048] Based on the above, the present application provides an antenna feed control method and circuit to solve the above problems.

[0049] The antenna feed control method and circuit provided by the present application will be described below. Figures 1 to 10

[0050] It should be noted that although theoretically the polarization method of the antenna is divided into linear polarization and circular polarization antennas, in practical applications, the antenna is usually Figure 4 ​The elliptical antenna polarization form shown is not absolutely consistent with the linear polarization or circular polarization antenna theory, but the elliptical antenna transmits and receives elliptical polarization waves with more or less ellipticity. The more circular elliptical polarization wave has smaller axial ratio and tends to be a circular polarization antenna (as shown in Figure 5 ), so it is called a circular polarization antenna; the more flat elliptical polarization wave has larger axial ratio and tends to be a linear polarization antenna (as shown in Figure 6 ), so it is called a linear polarization antenna.

[0051] The present application provides a solution to reduce the polarization loss of two signals based on the elliptical polarization form.

[0052] Figure 1 is one of the flowcharts of the antenna feed control method provided by the present application. Figure 2 is another flowchart of the antenna feed control method provided by the present application.

[0053] The antenna feed control method provided by the present application is applied to the main control unit of an antenna. In combination with Figure 1 and Figure 2 , the antenna feed control method provided by the present application includes:

[0054] S110: receiving the signal strength ratio and the first phase difference between the receiving signals of the two feed points of the antenna.

[0055] Specifically, the antenna includes two antenna units, and the polarization directions of the two antenna units are perpendicular to each other. The two feed points provide feed for the two antenna units, respectively. Thus, the external signal (transmission signal of the opposite end device) sent by the opposite end device is disassembled into two perpendicular components by the two antenna units (please refer to Figure 4 ). Similarly, the antenna transmits two perpendicular signals by the two antenna units, and the combined signal of the two signals is the transmission signal of the antenna.

[0056] According to the strength and phase of the receiving signals of the two feed points, the signal strength ratio and the phase difference of the receiving signals of the two feed points can be determined, the signal strength ratio represents the axial ratio of the external signal, and the phase difference represents the elliptical inclination angle of the external signal.

[0057] S120: determining the power distribution ratio and the second phase difference between the transmission signals of the two feed points according to the signal strength ratio and the first phase difference, the power distribution ratio is the same as the signal strength ratio, and the first phase difference is opposite to the second phase difference.

[0058] Specifically, the power distribution ratio of the transmission signals of the two antenna units is the same as the signal strength ratio of the reception signals of the two antenna units, which can ensure that the axial ratio of the transmission signals of the antenna is the same as the axial ratio of the external signals. The second phase difference of the transmission signals of the two antenna units is opposite to the first phase difference of the reception signals of the two antenna units, which can make the elliptical tilt angle of the transmission signals of the antenna the same as the elliptical tilt angle of the external signals.

[0059] S130: controlling the transmission power of the two feeding points according to the power distribution ratio and controlling the transmission phase of the two feeding points according to the second phase difference by using the feeding network.

[0060] Specifically, the transmission power and the transmission phase of the two antenna units can be adjusted by the feeding network to achieve the expected power distribution ratio and the second phase difference, so as to ensure that the polarization mode and the elliptical tilt angle of the transmission signals of the antenna are the same as those of the external signals.

[0061] The embodiment of the present application sets two vertically orthogonal antenna units on the antenna of the device, which is used to decompose the external signals into two vertical components, and according to the analysis results of the two vertical components, the transmission signals of the two antenna units are dynamically controlled by using the feeding network to synthesize the transmission signals with the same polarization mode and elliptical tilt angle as the external signals. No matter how the elliptical polarization mode and the elliptical tilt angle of the external electromagnetic wave signals change, the antenna polarization loss between the two devices can always be kept to the lowest. For example, in the case that the polarization mode of the first device changes due to reflection, etc., the second device at the other end can adjust the axial ratio and the elliptical tilt angle of its own transmission signals in real time according to the axial ratio and the elliptical tilt angle of the transmission signals of the first device, so as to ensure that the signals of the two devices are completely matched and the best communication effect is ensured.

[0062] In a possible implementation, the antenna includes two mutually vertically orthogonal linear polarization antenna units, so that the feeding points of the two antenna units can decompose the external signals into two mutually vertical components.

[0063] In the embodiment of the present application, the antenna adopts two linear polarization antenna units with mutually orthogonal polarization directions. The linear polarization antenna unit (such as a dipole or a microstrip patch) is mature in design and low in processing difficulty, and the orthogonal layout can be realized through a symmetric structure (such as a cross-shaped patch). Therefore, the antenna structure of the embodiment of the present application is simple, which is convenient for system integration and large-scale popularization and application.

[0064] In a possible implementation, in step S130, the transmission power of the two feeding points is controlled according to the power distribution ratio, and specifically includes:

[0065] S1301: determining the value of the adjusting element of the power distribution circuit of the feeding network according to the power distribution ratio.

[0066] S1302: The control adjusts the adjusting element to make the ratio of the output power between the two output terminals of the feeding network same as the power distribution ratio between the two feeding points connected by the two output terminals of the feeding network.

[0067] Each output terminal of the power distribution circuit is connected with an output terminal of the feeding network, and each output terminal of the feeding network is connected with a feeding point. That is, the output power of the two output terminals of the power distribution circuit is adjusted by adjusting the adjusting element in the power distribution circuit, and then the output power of the two output terminals of the feeding network is adjusted, so as to adjust the power distribution ratio of the two feeding points.

[0068] The embodiment of the present application adjusts the output power of the two feeding points in real time through the dynamically adjustable feeding network, so as to control the ratio of the transmit power of the two antenna units, so that the axial ratio of the transmit signal synthesized by the transmit signals of the two antenna units is same as the axial ratio of the external signal, thereby realizing the axial ratio consistency of the receive signal and the transmit signal by means of the adjusting element of the feeding network.

[0069] In a possible implementation, in step S130, the transmit power of the two feeding points is controlled according to the power distribution ratio, and the step further includes:

[0070] In the case that the power distribution ratio is the first ratio, the first leg and the third leg of the double-pole double-throw switch of the feeding network are controlled to be conductive, and the second leg and the fourth leg of the double-pole double-throw switch are controlled to be conductive, so that the ratio of the output power of the two output terminals of the power distribution circuit is the power distribution ratio; in the case that the power distribution ratio is the second ratio, the first leg and the fourth leg of the double-pole double-throw switch are controlled to be conductive, and the second leg and the third leg of the double-pole double-throw switch are controlled to be conductive, so that the ratio of the output power of the two output terminals of the power distribution circuit is the inverse of the power distribution ratio.

[0071] The first leg of the double-pole double-throw switch is connected with the output terminal of the first power adjusting module, the second leg of the double-pole double-throw switch is connected with the output terminal of the second power adjusting module, the third leg of the double-pole double-throw switch is connected with the output terminal of the feeding network corresponding to the first feeding point, and the fourth leg of the double-pole double-throw switch is connected with the output terminal of the feeding network corresponding to the second feeding point. One of the first ratio and the second ratio is greater than 1, and the other is less than 1.

[0072] For example, when the power distribution ratio is greater than 1, the first power adjustment module provides power supply for the first feeding point, and the second power adjustment module provides power supply for the second feeding point according to the above. When the power distribution ratio is less than 1, the first power adjustment module provides power supply for the second feeding point, and the second power adjustment module provides power supply for the first feeding point. Thus, compared with the case without the double-pole double-throw switch, the variation range of the power distribution ratio of each power adjustment module is reduced by half, the adjustment range of the adjustment element in the power adjustment module is reduced, the selection range of the adjustment element is expanded, and the design difficulty of the power adjustment module is reduced.

[0073] Based on the above, the application further provides an antenna feeding control circuit. The antenna feeding control circuit can be correspondingly referred to the above antenna feeding control method.

[0074] In a possible implementation manner, as shown in Figure 7 the antenna feeding control circuit comprises a radio frequency system, a main control unit and a feeding network.

[0075] Two signal detection ends 2 and 3 of the radio frequency system are connected with two feeding points P1 and P2 of the antenna respectively, forming signal detection paths of the two feeding points.

[0076] In a possible implementation manner, the two signal detection ends of the radio frequency system are connected with the two feeding points through first and second directional couplers in the radio frequency system respectively. Figure 7 The first pin of the directional coupler is connected with the feeding point, the second pin of the directional coupler is connected with one output end of the power distribution circuit (see the following description) of the feeding network, the third pin of the directional coupler is connected with one signal detection end of the radio frequency system, and the fourth pin of the directional coupler is connected with a load. The first pin of the directional coupler and the second pin of the directional coupler are through pins.

[0077] As shown in Figure 7 the first pin 1 of the first directional coupler (as the first output end of the feeding network) is connected with the feeding point P1, the second pin 2 of the first directional coupler is connected with one output end 2 of the power distribution circuit of the feeding network, the third pin 3 of the first directional coupler is connected with the signal detection end 3 of the radio frequency system, and the fourth pin 4 of the first directional coupler is connected with a load. The first pin 1 of the first directional coupler and the second pin 2 of the first directional coupler are through pins. Thus, when the feeding point P1 receives external signals, the first directional coupler couples a small part of the received signals and transmits them to the radio frequency system.

[0078] As shown in Figure 7As shown, pin 1 of the second directional coupler (serving as the second output terminal of the feed network) is connected to feed point P2, pin 2 of the second directional coupler is connected to the other output terminal 3 of the power distribution circuit of the feed network, pin 3 of the second directional coupler is connected to the signal detection terminal 2 of the RF system, and pin 4 of the second directional coupler is connected to the load. Pins 1 and 2 of the second directional coupler are through pins. Therefore, when feed point P2 receives an external signal, the second directional coupler couples a very small portion of the received signal and transmits it to the RF system.

[0079] In one possible implementation, the resistance of the load connected to pin 4 is 50 ohms.

[0080] In one possible embodiment, the coupling coefficient of the directional coupler is less than -20dB. The smaller the coupling coefficient, the less the antenna performance loss.

[0081] This application embodiment uses a directional coupler with a small coupling coefficient to collect the received signal at the feed point in real time for the radio frequency system to check and analyze. Compared with the signal detection method of switching cycle, this application embodiment can eliminate the influence of signal detection on the continuous communication signal on the communication path, ensure good communication signal continuity and communication rate, and at the same time have very little impact on communication path loss.

[0082] The signal output terminal of the radio frequency system and the main control unit ( Figure 7 The CPU main control unit is shown in the diagram. The radio frequency system is used to determine the signal strength ratio between the received signals at the two feed points P1 and P2. P (i.e., the signal strength of the received signal at P1 / the signal strength of the received signal at P2 = P) and the first phase difference ψ (i.e., the phase of the signal received by P1 - the phase of the signal received by P2 = ψ), and transmit the signal strength ratio and the first phase difference to the main control unit.

[0083] The antenna consists of two feed points, P1 and P2, each receiving one vertical component of the external signal (the transmitted signal from the other device). Specifically, the antenna comprises two antenna elements with mutually perpendicular polarization directions. The two feed points provide power to the two antenna elements respectively. Thus, the external signal transmitted by the other device is decomposed into two mutually perpendicular components by the two antenna elements (see reference...). Figure 4 Similarly, an antenna transmits mutually perpendicular signals through two antenna elements, and the combined signal of these two signals serves as the transmitted signal of the antenna.

[0084] In one possible implementation, the antenna comprises two mutually perpendicular or orthogonal linearly polarized antenna elements.

[0085] Figure 8 An example of a microstrip antenna is given, such as Figure 8 As shown, the microstrip antenna has two feed points P1 and P2, each connected to a linearly polarized antenna element, providing power to the corresponding element. The line connecting feed point P1 to the center of the microstrip antenna and the line connecting feed point P2 to the center of the microstrip antenna are perpendicular. The linear polarization directions of the two linearly polarized antenna elements are orthogonal. Feed points P1 and P2 are connected to the two output terminals of the feed network (…). Figure 7 The first pin 1 of the first directional coupler and the first pin 1 of the second directional coupler are connected.

[0086] like Figure 7 As shown, the input terminal 1 of the power supply network is connected to the communication port 1 of the radio frequency system via the relay unit Port1, forming a communication path. By connecting the communication port 1 of the radio frequency system to the relay unit Port1 for communication, it can be ensured that the electromagnetic wave polarization mode and elliptical tilt angle of the transmitted signal of the antenna of the signal receiving device are exactly the same as those of the external signal, ensuring that the two devices communicate with the lowest antenna polarization loss.

[0087] like Figure 7 As shown, the power supply network includes a power distribution circuit and a phase shifter. The power distribution circuit includes two parallel power regulation modules. The first terminal of each power regulation module is connected to the input terminal 1 of the power distribution circuit (i.e., the input terminal of the power supply network), and the second terminal of each power regulation module is an output terminal 2 or 3 of the power distribution circuit. Each output terminal 2 and 3 of the power distribution circuit is connected to an output terminal of the power supply network through a directional coupler (as shown above, the two output terminals of the power supply network are the first pin 1 of the first directional coupler and the first pin 1 of the second directional coupler, respectively). Each output terminal of the power supply network is connected to a feed point. The phase shifter is positioned between one of the output terminals of the power distribution circuit and the corresponding output terminal of the power supply network.

[0088] like Figure 7 As shown, the main control unit is connected to the phase shifter and the adjustment units of the two power adjustment modules. The main control unit determines the power distribution ratio and the second phase difference between the transmitted signals at the two feed points based on the signal strength ratio and the first phase difference. Furthermore, the main control unit adjusts the output power of the output terminals 2 and 3 of the two power adjustment modules by controlling the adjustment units of the power adjustment modules, so that the transmitted power at the two feed points reaches the power distribution ratio, i.e., the signal strength of the transmitted signal P1 / the signal strength of the transmitted signal P2 = ... P; Simultaneously, the main control unit adjusts the phase shift value of the phase shifter to make the phase difference between the two feed points the second phase difference, that is, the phase of the transmitted signal P1 / the phase of the transmitted signal P2 = ψ.

[0089] The embodiment of the application sets two vertical orthogonal antenna units on the antenna of the device, which are used to decompose the external signal into two vertical components, and according to the analysis result of the two vertical components, the signal transmitted by the two antenna units is dynamically controlled by using the feed network, so as to synthesize the transmission signal with the same polarization mode and elliptical tilt angle as the external signal. No matter how the elliptical polarization mode and the elliptical tilt angle of the external electromagnetic wave signal change, the embodiment of the application can always keep the antenna polarization loss between the two devices at the lowest level.

[0090] In a possible implementation, the power adjusting module includes a first adjusting element and a second adjusting element connected with the input end of the power distribution circuit respectively, the other end of the first adjusting element is grounded, and the other end of the second adjusting element is an output end of the power distribution circuit.

[0091] The embodiment of the application can quickly adjust the output power of the power adjusting module through the two adjusting elements on the power adjusting module, and can flexibly control the ratio of the output power of the two power adjusting modules.

[0092] In a possible implementation, the first adjusting element is a first adjusting capacitor, and the second adjusting element is an adjusting inductor.

[0093] As shown in Figure 7 the input end of the power distribution circuit in the feed network is connected with two parallel power adjusting modules, the first power adjusting module includes an adjusting inductor L1 and an adjusting capacitor C1 (i.e. a first adjusting capacitor), the adjusting inductor L1 is connected between the input end 1 of the power distribution circuit and the output end 2 of the power distribution circuit, the first end of the adjusting capacitor C1 is connected with the input end 1 of the power distribution circuit, and the second end of the adjusting capacitor C1 is grounded. The second power adjusting module includes an adjusting inductor L2 and an adjusting capacitor C2 (i.e. a first adjusting capacitor), the adjusting inductor L2 is connected between the input end 1 of the power distribution circuit and the output end 3 of the power distribution circuit, the first end of the adjusting capacitor C2 is connected with the input end 1 of the power distribution circuit, and the second end of the adjusting capacitor C2 is grounded.

[0094] The first control pin I1 of the main control unit is used to control the value of the adjusting capacitor C1, the second control pin I2 is used to control the value of the adjusting capacitor C2, the third control pin I3 is used to control the value of the adjusting inductor L1, and the fourth control pin I4 is used to control the value of the adjusting inductor L2.

[0095] Figure 7 In the case, assuming that the impedance of the entire channel system is the antenna end impedance Z0 (Z0 is generally 50 ohms), the impedance of the two output ends 2 and 3 of the power distribution circuit is Z0, according to the parallel impedance and power relationship, if the impedance R2 of the first power adjusting module at the branch point (seeFigure 7 ) and the second power adjustment module at the branch point impedance R3 (see Figure 7 ) is R3 / R2= P, then the output power of the output end 2 / the output power of the output end 3= P can be achieved. According to the following series-parallel impedance relationship formula, it can be obtained that:

[0096] R3 / R2= P;

[0097] R3 R2 / (R3+R2)=Z0;

[0098] R2=(Z0+jωL1) (1 / (jωC1)) / (Z0+jωL1+1 / (jωC1));

[0099] R3=(Z0+jωL2) (1 / (jωC2)) / (Z0+jωL2+1 / (jωC2)).

[0100] Wherein, j is the imaginary unit.

[0101] The main control unit calculates the values of the adjustment inductance L1, the adjustment capacitance C1, the adjustment inductance L2 and the adjustment capacitance C2 according to the above formula:

[0102] L1=Z0 / (ω P 0.5 );

[0103] L2=Z0 P 0.5 / ω;

[0104] C1= P 0.5 / (Z0 ω (1+ P));

[0105] C2= P 0.5 / (Z0 ω (1+ P));

[0106] Wherein, ω=2πf, f is the working frequency of the antenna.

[0107] After the above values are obtained, the main control unit controls the adjusting capacitor C1, the adjusting capacitor C2, the adjusting inductor L1 and the adjusting inductor L2 to the corresponding values respectively through the control pins I1 / I2 / I3 / I4, so as to realize the output power of the output end 2 / the output power of the output end 3 P.

[0108] In another possible implementation, the first adjusting element is a first adjusting capacitor. The second adjusting element is a fixed inductor and a second adjusting capacitor in parallel.

[0109] In this embodiment, the fixed inductor and the second adjusting capacitor in parallel are used as the second adjusting element to replace the adjusting inductor in the middle power adjusting module. Please refer to Figure 7 and Figure 7 and Figure 9 Take the first power adjusting module as an example. The second adjusting element includes the adjusting capacitor C01 (second adjusting capacitor) and the fixed inductor L01 in parallel. The parallel module is used to replace the adjusting inductor L1. The second adjusting element in the second power adjusting module also includes the fixed inductor and the second adjusting capacitor in parallel.

[0110] Based on the derivation result of the above Figure 7 , the value of the adjusting capacitor C01 can be calculated according to the following parallel admittance relationship formula of the circuit:

[0111] 1 / jωL1=1 / jωL01+jωC01;

[0112] That is, L1=L01 / (1-ω 2 L01C01).

[0113] Therefore, from the above formula, when L01 is the inductance value of the fixed inductor, the inductance value adjustment of the adjusting inductor L1 can be realized by adjusting the capacitance value of the second adjusting capacitor C01.

[0114] In the embodiments of the present application, the fixed inductor and the adjusting capacitor in parallel are used as the second adjusting element. Since the adjustable capacitor has more options, it is more convenient to design the second adjusting element, and the design difficulty of the feed network is reduced.

[0115] In another possible implementation, the first adjusting element is a first adjusting capacitor. The second adjusting element is a fixed inductor and a third adjusting capacitor in series.

[0116] In this embodiment, the fixed inductor and the third adjusting capacitor in series are used as the second adjusting element to replace the adjusting inductor in the middle power adjusting module. Please refer to Figure 7 and Figure 7 and Figure 10For example, the second adjusting element of the second power adjusting module includes a fixed inductor L02 and an adjusting capacitor C02 (i.e., a third adjusting capacitor) connected in series, and the series module is used to replace the adjusting inductor L2. The second adjusting element of the first power adjusting module also includes a fixed inductor and a third adjusting capacitor connected in series.

[0117] Based on the derivation result of the above Figure 7 , the value of the adjusting capacitor C02 can be calculated according to the following circuit series impedance relationship:

[0118] jωL2=jωL02+1 / jωC02;

[0119] That is, L2=L02-(1 / ω 2 C02).

[0120] Therefore, from the above formula, when the inductance value of the fixed inductor L02 is fixed, the inductance value adjustment of the adjusting inductor L2 can be realized by adjusting the capacitance value of the adjusting capacitor C02.

[0121] In the embodiments of the present application, the fixed inductor and the adjusting capacitor connected in series are used as the second adjusting element. Since the adjustable capacitor has more types to choose from, it is more convenient to design the second adjusting element, and the design difficulty of the power distribution network is reduced.

[0122] Based on the above, the variation range of the power distribution ratio is large, and for the power distribution circuit, the first adjusting element and the second adjusting element with a large adjustment range need to be selected. In this case, the selection range of the adjusting element is greatly reduced, and the design difficulty is large.

[0123] Based on the above consideration, in a possible implementation manner, the power distribution network further includes a double-pole double-throw (DPDT) switch. The two output ends of the power distribution circuit are respectively connected with two input pins of the double-pole double-throw (DPDT) switch, and two output pins of the double-pole double-throw (DPDT) switch are respectively connected with the two output ends of the two power distribution networks.

[0124] As shown in Figure 7 , the first input pin (first pin 1) and the second input pin (first pin 2) of the double-pole double-throw (DPDT) switch are respectively connected with the output ends 2 and 3 of the power distribution circuit, and the first output pin (third pin 3) and the second output pin (fourth pin 4) of the double-pole double-throw (DPDT) switch are respectively connected with the phase shifter (connected with the feeding point P1) and the second pin 2 (connected with the feeding point P2) of the second directional coupler.

[0125] Specifically, when the power distribution ratio When P is the first proportion (for example, greater than 1), the fifth control pin I5 of the main control unit outputs a low level, controls the first pin 1 and the third pin 3 of the double-pole double-throw switch DPDT to be conductive, controls the second pin 2 and the fourth pin 4 of the double-pole double-throw switch DPDT to be conductive, and at this time, the output power ratio of the two output ends of the power distribution circuit is the power distribution proportion P.

[0126] When the power distribution proportion P is the second proportion (for example, less than 1), the fifth control pin I5 of the main control unit outputs a high level, controls the first pin 1 and the fourth pin 4 of the double-pole double-throw switch DPDT to be conductive, controls the second pin 2 and the third pin 3 of the double-pole double-throw switch DPDT to be conductive, and at this time, the output power ratio of the two output ends of the power distribution circuit is the reciprocal of the power distribution proportion (that is, 1 / P).

[0127] The embodiment of the application reduces the adjustment range of the adjusting element in the power distribution circuit by half on the basis of ensuring that the power distribution proportion of the two feeding points is met, thereby expanding the selection range of the adjusting element, and reducing the design difficulty.

[0128] On the basis of the above, please refer to Figure 7 The third pin 3 of the double-pole double-throw switch DPDT is connected with a phase shifter, the other end of the phase shifter is connected with the second pin 2 of the first directional coupler, the first pin 1 of the first directional coupler is connected to the feeding point P1, and the first pin 1 and the second pin 2 of the first directional coupler are straight-through pins, so the insertion loss is very small. The phase shift range of the phase shifter is-180°~180°. The main control unit controls the phase shifter to adjust to the corresponding phase shift value through the sixth control pin I6, so that the phase difference of the transmission signals of the two feeding points is the second phase difference.

[0129] Based on the switching principle of the double-pole double-throw switch DPDT, when the first pin 1 and the third pin 3 of the double-pole double-throw switch DPDT are conductive, and the second pin 2 and the fourth pin 4 are conductive, the main control unit controls the phase shifter to adjust the phase shift value to- ψ, ensures that the power distribution proportion between the transmission signals of the two feeding points is P, and the phase difference is- ψ, which is the same as the signal strength proportion of the receiving signals of the two feeding points, and the phase difference is opposite.

[0130] When the first pin 1 and the fourth pin 4 of the double-pole double-throw switch DPDT are conductive, and the second pin 2 and the third pin 3 are conductive, the main control unit controls the phase shifter to adjust the phase shift value to ψ, to ensure the power distribution ratio between the transmission signals of the two feeding points is P, the phase difference is ψ, the signal intensity ratio of the receiving signals of the two feeding points is the same, and the phase difference is opposite.

[0131] The following is an example based on the embodiment of Figure 7 The antenna feeding control method of the present application is illustrated by the following example:

[0132] Assuming the signal intensity ratio between the receiving signals of the two feeding points P1 and P2 of the antenna is P=8( P>1), the first phase difference is ψ=70°, the antenna operating frequency f=400MHz, and the antenna terminal impedance Z0=50Ω. The main control unit obtains the following values by calculation:

[0133] ω=2πf;

[0134] L1=Z0 / (ω P 0.5 )=7.0 (unit: nH);

[0135] L2=Z0 P 0.5 / ω=56.3 (unit: nH);

[0136] C1= P 0.5 / (Z0 ω (1+ P))=2.5 (unit: pF);

[0137] C2= P 0.5 / (Z0 ω (1+ P))=2.5 (unit: pF).

[0138] The main control unit controls the first foot 1 and the third foot 3 of the double-pole double-throw switch DPDT to be conductive, the second foot 2 and the fourth foot 4 to be conductive, and adjusts the respective adjusting elements of the power distribution circuit through the respective control feet, and controls the phase shift value of the phase shifter to be -70°, so that the power distribution ratio between the transmission signals of the two feeding points is the same as the signal intensity ratio, and the second phase difference between the transmission signals of the two feeding points is opposite to the first phase difference.

[0139] On this basis, through the reverse verification of the values of L1, L2, C1, and C2, the following values are calculated:

[0140] R2=(Z0+jωL1) (1 / (jωC1)) / (Z0+jωL1+1 / (jωC1))=56.2 (unit: Ω);

[0141] R3=(Z0+jωL2) (1 / (jωC2)) / (Z0+jωL2+1 / (jωC2))=450.4 (unit: Ω);

[0142] P = R3 / R2 = 450.4 / 56.2 = 8.0, which is the ratio of the signal strength received at feed points P1 and P2. P is exactly the same;

[0143] R3 R2 / (R3+R2)=50.0 (unit: Ω), which is the same as the system impedance (i.e., antenna end impedance) of 50Ω, thus satisfying impedance matching.

[0144] This application designs two perpendicularly orthogonal antenna elements on the antenna to detect in real time the signal strength ratio and phase difference of the two perpendicular components of the electromagnetic wave signal received by the antenna, thereby determining the axial ratio and elliptic tilt angle of the received signal electromagnetic wave. In the Port1 communication path, the power distribution circuit and phase shifter of the feed network are used to ensure that the power distribution ratio of the transmitted signal of the two antenna elements is the same as the signal strength ratio of the two perpendicular components of the received external signal electromagnetic wave, and the phase difference of the transmitted signal of the two antenna elements is opposite to the phase difference of the two perpendicular components of the received external signal electromagnetic wave. This ensures that the communication antenna of the wireless communication device and the received signal electromagnetic wave have completely consistent elliptic polarization and elliptic tilt angle, effectively reducing polarization loss between communication antennas and improving communication performance.

[0145] On the other hand, this application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a computer, the computer can execute the antenna feed control method provided in the above embodiments. The method includes: receiving the signal strength ratio and a first phase difference between the received signals of two feed points of an antenna, wherein the two feed points respectively receive one vertical component of an external signal; determining a power distribution ratio and a second phase difference between the transmitted signals of the two feed points based on the signal strength ratio and the first phase difference, wherein the power distribution ratio is the same as the signal strength ratio and the first phase difference is opposite to the second phase difference; and using a feed network, controlling the transmitted power of the two feed points based on the power distribution ratio and controlling the transmitted phase of the two feed points based on the second phase difference.

[0146] In yet another aspect, the application also provides a non-transitory computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the antenna feeding control method provided by any of the above embodiments. The method comprises: receiving a signal strength ratio and a first phase difference between received signals of two feeding points of an antenna, the two feeding points receiving one vertical component of an external signal respectively; determining a power distribution ratio and a second phase difference between transmitted signals of the two feeding points according to the signal strength ratio and the first phase difference, the power distribution ratio being the same as the signal strength ratio, and the first phase difference being opposite to the second phase difference; and using a feeding network to control the transmission power of the two feeding points according to the power distribution ratio and to control the transmission phase of the two feeding points according to the second phase difference.

[0147] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0148] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of software and necessary universal hardware platforms, and of course can also be implemented by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a Read-Only Memory (ROM) / Random Access Memory (RAM), a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0149] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. An antenna feed control circuit, characterized in that, This includes the radio frequency system, the main control unit, and the power supply network; The two signal detection terminals of the radio frequency system are respectively connected to the two feed points of the antenna, and the signal output terminal of the radio frequency system is connected to the main control unit; the radio frequency system is used to determine the signal strength ratio and the first phase difference between the received signals at the two feed points, and the two feed points respectively receive one vertical component of the external signal; The input terminal of the power supply network is communicatively connected to the radio frequency system. The power supply network includes a power distribution circuit and a phase shifter. The power distribution circuit includes two parallel power adjustment modules. The first terminal of each power adjustment module is connected to the input terminal of the power distribution circuit, and the second terminal of each power adjustment module is an output terminal of the power distribution circuit. Each output terminal of the power distribution circuit is connected to an output terminal of the power supply network, and each output terminal of the power supply network is connected to a feed point. The phase shifter is disposed between one of the output terminals of the power distribution circuit and the corresponding output terminal of the power supply network. The main control unit is connected to the phase shifter and the adjustment units of the two power adjustment modules respectively; In this configuration, the two signal detection terminals of the radio frequency system are respectively connected to the two feed points via directional couplers. The first pin of the directional coupler is connected to the feed point, the second pin of the directional coupler is connected to an output terminal of the feed network, the third pin of the directional coupler is connected to a signal detection terminal of the radio frequency system, and the fourth pin of the directional coupler is connected to the load. The first and second pins of the directional coupler are through pins. The main control unit is used for: The ratio of the received signals at the two feed points of the receiving antenna and the first phase difference; The power distribution ratio and the second phase difference between the transmitted signals of the two feed points are determined based on the signal strength ratio and the first phase difference. The power distribution ratio is the same as the signal strength ratio, and the first phase difference is opposite to the second phase difference. Using the power supply network, the transmission power of the two power supply points is controlled according to the power distribution ratio, and the transmission phase of the two power supply points is controlled according to the second phase difference.

2. The antenna feed control circuit according to claim 1, characterized in that, The power regulation module includes a first regulation element and a second regulation element that are respectively connected to the input terminal of the power distribution circuit. The other end of the first regulation element is grounded, and the other end of the second regulation element is an output terminal of the power distribution circuit.

3. The antenna feed control circuit according to claim 2, characterized in that, The first regulating element is the first regulating capacitor.

4. The antenna feed control circuit according to claim 2 or 3, characterized in that, The second adjusting element is one of the following: Adjust the inductance; A fixed inductor and a second regulating capacitor connected in parallel; A fixed inductor and a third regulating capacitor are connected in series.

5. The antenna feed control circuit according to claim 2, characterized in that, The two outputs of the power distribution circuit are respectively connected to the two input pins of the double-pole double-throw switch, and the two output pins of the double-pole double-throw switch are respectively connected to the two outputs of the power supply network.

6. The antenna feed control circuit according to claim 1, characterized in that, The antenna comprises two mutually perpendicular or orthogonal linearly polarized antenna elements.

7. The antenna feed control circuit according to claim 5, characterized in that, Controlling the transmission power of the two feed points according to the power allocation ratio specifically includes: The values ​​of the first regulating element and the second regulating element are determined based on the power distribution ratio; The values ​​of the first and second regulating elements are adjusted so that the ratio of the output power between the two output terminals of the power supply network is the same as the power distribution ratio between the power supply points connected to the two output terminals of the power supply network.

8. The antenna feed control circuit according to claim 7, characterized in that, Controlling the transmission power of the two feed points according to the power allocation ratio further includes: When the power distribution ratio is the first ratio, the first and third pins of the double-pole double-throw switch are turned on, and the second and fourth pins of the double-pole double-throw switch are turned on. At this time, the output power ratio of the two output terminals of the power distribution circuit is the power distribution ratio. When the power distribution ratio is the second ratio, the first and fourth pins of the double-pole double-throw switch are turned on, and the second and third pins of the double-pole double-throw switch are turned on. At this time, the output power ratio of the two output terminals of the power distribution circuit is the reciprocal of the power distribution ratio. Wherein, the first pin of the double-pole double-throw switch is connected to the output terminal of the first power regulation module, the second pin of the double-pole double-throw switch is connected to the output terminal of the second power regulation module, the third pin of the double-pole double-throw switch is connected to the output terminal of the feed network corresponding to the first feed point, and the fourth pin of the double-pole double-throw switch is connected to the output terminal of the feed network corresponding to the second feed point; one of the first ratio and the second ratio is greater than 1, and the other is less than 1.

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