Antenna feed control method and circuit

Abstract

The invention provides an antenna feed control method and circuit, and belongs to the technical field of wireless communication, and the method comprises the steps: receiving a signal intensity ratio and a first phase difference between received signals of two feed points of an antenna, and enabling the two feed points to receive one vertical component of an external signal respectively; determining a power distribution proportion and a second phase difference between the transmitting signals of the two feeding points according to the signal strength proportion and the first phase difference, the power distribution proportion being the same as the signal strength proportion, and the first phase difference being opposite to the second phase difference; and using the feed network to control the transmitting power of the two feed points according to the power distribution proportion, and controlling the transmitting phases of the two feed points according to the second phase difference. According to the invention, the external signal is disassembled into the two vertical components, the transmission signals of the two antenna units are dynamically controlled by using the feed network according to the analysis result of the two vertical components, the signal matched with the external signal is synthesized, and the polarization loss of the antenna between the two devices is always kept to be the lowest.

Description

Technical Field

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

[0002] Antennas are crucial components in wireless communication devices. When two wireless devices communicate through antennas, transmitting and receiving signals, if the two antennas have different polarizations, this can cause polarization loss, increasing attenuation in the communication link between the devices and impacting communication quality.

[0003] Traditionally, the solution to reducing antenna polarization loss between wireless communication devices requires that the polarization modes of the two antennas must be identical when communicating between the two devices. Only when two antennas with the same polarization mode communicate can the polarization loss be minimized.

[0004] However, in actual applications, even if the two signals have the same polarization mode, the polarization loss will still be affected by the relative polarization angle of the two signals and the radiation direction of the signal itself, and the polarization loss will still be large. Summary of the Invention

[0005] The present application provides an antenna feed control method and circuit, aiming to solve the problem of large antenna polarization loss between wireless communication devices.

[0006] In a first aspect, the present application provides an antenna feed control method, applied to a main control unit, comprising: a signal strength ratio and a first phase difference between received signals at two feeding points of the receiving antenna, the two feeding points respectively receiving one vertical component of the external signal; Determine a power distribution ratio and a second phase difference between the transmission signals of the two feeding 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; The feeding network is utilized to control the transmission power of the two feeding points according to the power distribution ratio, and the transmission phases of the two feeding points are controlled according to the second phase difference.

[0007] In one embodiment, the antenna includes two linearly polarized antenna units that are perpendicular to each other.

[0008] In one embodiment, controlling the transmission power of the two feeding points according to the power allocation ratio specifically includes: Determining the values ​​of regulating elements in a power distribution circuit of the feed network according to the power distribution ratio; The control regulating element is controlled to adjust the value so that the ratio of the output power between the two output terminals of the feed network is the same as the power distribution ratio between the feed points connected to the two output terminals of the feed network; Each output end of the power distribution circuit is connected to an output end of the feeding network, and each output end of the feeding network is connected to a feeding point.

[0009] In one embodiment, controlling the transmission power of the two feeding 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 of the feed network are controlled to be 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 ends 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 controlled to be turned on, and the second and third pins of the double-pole double-throw switch are controlled to be turned on. At this time, the output power ratio of the two output ends of the power distribution circuit is the inverse of the power distribution ratio; In which, the first pin of the double-pole double-throw switch is connected to the output end of the first power regulation module, the second pin of the double-pole double-throw switch is connected to the output end of the second power regulation module, the third pin of the double-pole double-throw switch is connected to the output end of the feed network corresponding to the first feeding point, and the fourth pin of the double-pole double-throw switch is connected to the output end of the feed 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.

[0010] In a second aspect, the present application further provides an antenna feed control circuit, comprising a radio frequency system, a main control unit, and a feed network; The two signal detection terminals of the radio frequency system are respectively connected to the two feeding 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 feeding points, and the two feeding points respectively receive one vertical component of the external signal; The input end of the feed network is communicatively connected to the radio frequency system, and the feed network includes a power distribution circuit and a phase shifter. The power distribution circuit includes two parallel power regulation modules, a first end of each power regulation module is connected to the input end of the power distribution circuit, and a second end of each power regulation module is an output end of the power distribution circuit. Each output end of the power distribution circuit is respectively connected to an output end of the feed network, and the output end of each feed network is connected to a feed point. The phase shifter is arranged between one of the output ends of the power distribution circuit and the output end of the corresponding feed network. The main control unit is connected to the phase shifter and the regulating units of the two power regulating modules respectively.

[0011] In one embodiment, the power regulation module includes a first regulation element and a second regulation element respectively connected to the input end 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 end of the power distribution circuit.

[0012] In one embodiment, the first regulating element is a first regulating capacitor.

[0013] In one embodiment, the second regulating 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 adjustment capacitor are connected in series.

[0014] In one embodiment, two output terminals of the power distribution circuit are respectively connected to two input pins of a double-pole double-throw switch, and two output pins of the double-pole double-throw switch are respectively connected to two output terminals of the feed network.

[0015] In one embodiment, two signal detection ends of the radio frequency system are respectively connected to two feeding points through directional couplers, the first pin of the directional coupler is connected to the feeding point, the second pin of the directional coupler is connected to an output end of the power distribution circuit, the third pin of the directional coupler is connected to a signal detection end of the radio frequency system, and the fourth pin of the directional coupler is connected to the load; the first pin of the directional coupler and the second pin of the directional coupler are through pins. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is one of the flow charts of the antenna feed control method provided in this application; Figure 2 This is the second flow chart of the antenna feed control method provided by this application; Figure 3 It is a schematic diagram of the relationship between antenna gain direction and polarization; Figure 4 It is one of the schematic diagrams of the elliptical polarization of the electric field direction of the electromagnetic waves received and transmitted by the antenna; Figure 5 It is one of the circular polarization diagrams of the electric field direction of the electromagnetic waves received and transmitted by the antenna; Figure 6 It is one of the linear polarization diagrams of the electric field direction of the electromagnetic waves received and transmitted by the antenna; Figure 7 This is one of the schematic diagrams of the antenna feed control circuit provided in this application; Figure 8This is one of the two vertical orthogonal microstrip antenna schematics provided in this application; Figure 9 is one of the structural schematic diagrams of the second regulatory element provided in this application; Figure 10 This is the second structural schematic diagram of the second regulatory element provided in this application. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0019] It should be noted that, in the description of this application, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0020] The terms "first," "second," and the like in this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that such terms are interchangeable where appropriate, so that embodiments of this application can be implemented in an order other than that illustrated or described herein. Furthermore, the terms "first," "second," and the like generally distinguish objects of a class and do not limit the number of objects; for example, the first object can be one or more. Furthermore, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the connected objects.

[0021] Antennas can be divided into linearly polarized and circularly polarized antennas based on their polarization mode. Linearly polarized antennas can be further divided into vertically linearly polarized antennas and horizontally linearly polarized antennas based on the direction of their electric field vector. Circularly polarized antennas can be further divided into left-hand circularly polarized antennas and right-hand circularly polarized antennas based on the rotation direction of their electric field vector.

[0022] In practical applications, such as Figure 3As shown, relatively good polarization performance can only be designed in the direction of maximum gain radiation (the main radiation direction) of an antenna polarization scheme; in other radiation directions, its polarization performance degrades significantly. For example, a linearly polarized antenna can achieve excellent polarization performance in its maximum gain direction, with a very large axial ratio (the axial ratio is a parameter that reflects the antenna's polarization performance; a larger axial ratio indicates an antenna closer to a linearly polarized antenna, while a smaller axial ratio indicates an antenna closer to a circularly polarized antenna). However, in directions away from the antenna's maximum gain radiation direction, polarization performance deteriorates significantly, and the axial ratio decreases. Furthermore, even with the same polarization scheme, communication performance is only effective when the polarization angles of the two signals align. Therefore, when two devices communicate, as the relative polarization angle between the two signals increases, the antenna polarization loss gradually increases, affecting communication between the two wireless devices.

[0023] Therefore, even if the two signals have the same polarization mode, the polarization loss will be affected by the radiation direction of the signal itself and the relative angle of the polarization of the two signals, and the polarization loss will still be large.

[0024] Based on the above, the present application provides an antenna feed control method and circuit to solve the above problems.

[0025] The following combination Figures 1 to 10 The present invention describes an antenna feed control method and circuit.

[0026] It should be noted that although in theory the antenna polarization is divided into linear polarization antenna and circular polarization antenna, in actual application the antenna is Figure 4 The polarization form of the elliptical antenna shown does not absolutely conform to the theoretical linear polarization or circular polarization antenna. It is just that the elliptical degree of the antenna receiving and transmitting elliptical polarization waves is more round or flatter. The more rounded elliptical polarization waves have a smaller axial ratio and are closer to the circular polarization antenna (such as Figure 5 As shown in the figure), it is called a circularly polarized antenna; a flatter elliptically polarized wave has a larger axial ratio and is closer to a linearly polarized antenna (as shown in the figure). Figure 6 As shown), it is called a linearly polarized antenna.

[0027] This application provides a solution for reducing polarization loss of two signals based on elliptical polarization.

[0028] Figure 1 This is one of the flow charts of the antenna feed control method provided in this application. Figure 2 This is the second flow chart of the antenna feed control method provided in this application.

[0029] The antenna feed control method provided in this application is applied to the main control unit of the antenna. Figure 1 and Figure 2 , the antenna feed control method provided in this application includes: S110: Receive a signal strength ratio and a first phase difference between received signals at two feeding points of the antenna.

[0030] The two feeding points each receive one of the perpendicular components of the external signal (the transmitted signal from the peer device). Specifically, the antenna includes two antenna units, and the polarization directions of the two antenna units are perpendicular to each other. The two feeding points provide feed power to the two antenna units respectively. As a result, the external signal sent by the peer device is decomposed into two perpendicular components by the two antenna units (please refer to Figure 4 ). Similarly, the antenna transmits perpendicular signals through two antenna units, and the composite signal of these two signals serves as the antenna's transmission signal.

[0031] The signal strength ratio and phase difference of the received signals at the two feeding points can be determined based on the strength and phase of the received signals at the two feeding points. The signal strength ratio represents the axial ratio of the external signal, and the phase difference represents the elliptical inclination of the external signal.

[0032] S120: Determine a power distribution ratio and a second phase difference between the transmission signals of the two feeding 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.

[0033] Specifically, the power allocation ratio of the transmitted signals of the two antenna units is the same as the signal strength ratio of the received signals of the two antenna units, thereby ensuring that the axial ratio of the transmitted signal of the antenna is the same as the axial ratio of the external signal. The second phase difference of the transmitted signals of the two antenna units is opposite to the first phase difference of the received signals of the two antenna units, thereby ensuring that the elliptical inclination angle of the transmitted signal of the antenna is the same as the elliptical inclination angle of the external signal.

[0034] S130: Using the feeding network, controlling the transmission power of the two feeding points according to the power allocation ratio, and controlling the transmission phases of the two feeding points according to the second phase difference.

[0035] Specifically, the transmission power and transmission phase of the two antenna units can be adjusted through the feeding network to achieve the expected power distribution ratio and second phase difference, ensuring that the polarization mode and elliptical inclination angle of the antenna's transmission signal are the same as those of the external signal.

[0036] In an embodiment of the present application, two vertically orthogonal antenna units are set on the antenna of the device to decompose the external signal into two vertical components, and based on the analysis results of the two vertical components, the transmission signals of the two antenna units are dynamically controlled by the feed network to synthesize the transmission signal with the same polarization mode and elliptical inclination as the external signal. No matter how the elliptical polarization mode and elliptical inclination of the external electromagnetic wave signal change, the embodiment of the present application can always keep the antenna polarization loss between the two devices at the lowest. For example, when the polarization mode of the first device changes due to reflection, the second device at the opposite end will adjust the axial ratio and elliptical inclination of its own transmission signal in real time according to the axial ratio and elliptical inclination of the transmission signal of the first device, to ensure that the signals of the two devices are fully matched and to ensure the best communication effect.

[0037] In a possible implementation, the antenna includes two mutually perpendicular orthogonal linearly polarized antenna units, so that the feeding points of the two antenna units can decompose the external signal into two mutually perpendicular components.

[0038] In the embodiment of the present application, the antenna adopts a linearly polarized antenna unit with two polarization directions orthogonal to each other. The linearly polarized antenna unit (such as a dipole and a microstrip patch) has a mature design and low processing difficulty, and the orthogonal layout can be achieved through a symmetrical 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 promotion and application.

[0039] In one possible implementation, in step S130, controlling the transmit power of the two feeding points according to the power allocation ratio specifically includes: S1301: Determine values ​​of regulating elements of a power distribution circuit of a feed network according to a power distribution ratio.

[0040] S1302: Control the regulating element to adjust the value so that the ratio of the output power between the two output terminals of the feeding network is the same as the power distribution ratio between the feeding points connected to the two output terminals of the feeding network.

[0041] Each output terminal of the power distribution circuit is connected to an output terminal of the feed network, and each output terminal of the feed network is connected to a feed point. In other words, by adjusting the adjustment elements within the power distribution circuit, the output power of the two output terminals of the power distribution circuit is adjusted, and the output power of the two output terminals of the feed network is adjusted, thereby adjusting the power distribution ratio between the two feed points.

[0042] In the embodiment of the present application, a dynamically adjustable feeding network is used to adjust the output power of the two feeding points in real time, thereby controlling the ratio of the transmission power of the two antenna units, so that the axial ratio of the transmitted signal synthesized by the transmission signals of the two antenna units is the same as the axial ratio of the external signal, thereby achieving axial ratio consistency between the received signal and the transmitted signal with the help of the adjustment elements of the feeding network.

[0043] In a possible implementation, in step S130, controlling the transmit power of the two feeding 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 of the feed network are controlled to be 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 ends 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 controlled to be 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 ends of the power distribution circuit is the inverse of the power distribution ratio.

[0044] The first pin of the double-pole double-throw switch is connected to the output of the first power regulation module, the second pin of the double-pole double-throw switch is connected to the output of the second power regulation module, the third pin of the double-pole double-throw switch is connected to the output 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 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.

[0045] Taking the first ratio being greater than 1 as an example, it can be seen from the above that when the power distribution ratio is greater than 1, the first power regulation module provides power feeding for the first feeding point, and the second power regulation module provides power feeding for the second feeding point. When the power distribution ratio is less than 1, the first power regulation module provides power feeding for the second feeding point, and the second power regulation module provides power feeding for the first feeding point. Therefore, compared with the case where there is no double-pole double-throw switch, the embodiment of the present application reduces the variation range of the power distribution ratio of each power regulation module by half, reduces the adjustment range of the adjustment element in the power regulation module, expands the selection range of the adjustment element, and reduces the design difficulty of the power regulation module.

[0046] Based on the above, the present application further provides an antenna feed control circuit. The antenna feed control circuit and the above antenna feed control method can refer to each other.

[0047] In one possible implementation, Figure 7 As shown, the antenna feed control circuit includes a radio frequency system, a main control unit and a feed network.

[0048] The two signal detection terminals 2 and 3 of the radio frequency system are connected to the two feeding points P1 and P2 of the antenna respectively, forming a signal detection path of the two feeding points.

[0049] In a possible implementation, the two signal detection ends of the radio frequency system are respectively connected through directional couplers ( Figure 7The first directional coupler and the second directional coupler in the directional coupler are connected to two feeding points, the first pin of the directional coupler is connected to the feeding point, the second pin of the directional coupler is connected to one of the output terminals of the power distribution circuit of the feeding network (see the following description), the third pin of the directional coupler is connected to a signal detection terminal of the RF system, and the fourth pin of the directional coupler is connected to the load; the first pin and the second pin of the directional coupler are through pins.

[0050] like Figure 7 As shown, the first pin 1 of the first directional coupler (serving as the first output terminal of the feed network) is connected to the feed point P1, the second pin 2 of the first directional coupler is connected to one of the output terminals 2 of the power distribution circuit of the feed network, the third pin 3 of the first directional coupler is connected to the signal detection terminal 3 of the RF system, and the fourth pin 4 of the first directional coupler is connected to the load. The first pin 1 of the first directional coupler and the second pin 2 of the first directional coupler are direct-through pins. Therefore, when the feed point P1 receives an external signal, the first directional coupler couples a very small portion of the received signal and transmits it to the RF system.

[0051] like Figure 7 As shown, the first pin 1 of the second directional coupler (serving as the second output terminal of the feed network) is connected to the feed point P2, the second pin 2 of the second directional coupler is connected to another output terminal 3 of the power distribution circuit of the feed network, the third pin 3 of the second directional coupler is connected to the signal detection terminal 2 of the RF system, and the fourth pin 4 of the second directional coupler is connected to the load. The first pin 1 of the second directional coupler and the second pin 2 of the second directional coupler are direct-through pins. Therefore, when the 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.

[0052] In a possible implementation, the resistance of the load connected to the fourth pin 4 is 50 ohms.

[0053] In a possible embodiment, the coupling coefficient of the directional coupler is less than -20 dB. The smaller the coupling coefficient, the smaller the antenna performance loss.

[0054] The embodiment of the present application uses a directional coupler with a small coupling coefficient to collect the received signal of the feeding point in real time for inspection and analysis by the radio frequency system. Compared with the signal detection of the switch cycle switching method, the embodiment of the present application 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 the communication path loss.

[0055] The signal output terminal of the RF system is connected to the main control unit ( Figure 7 The RF system is used to determine the signal strength ratio between the received signals at the two feeding points P1 and P2. P (i.e. signal strength of the signal received by P1 / signal strength of the signal received by 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 transmits the signal strength ratio and the first phase difference to the main control unit.

[0056] The two feeding points P1 and P2 each receive one of the perpendicular components of the external signal (the transmitted signal from the peer device). Specifically, the antenna includes two antenna units, and the polarization directions of the two antenna units are perpendicular to each other. The two feeding points provide feed power to the two antenna units respectively. As a result, the external signal sent by the peer device is decomposed into two perpendicular components by the two antenna units (please refer to Figure 4 ). Similarly, the antenna transmits perpendicular signals through two antenna units, and the composite signal of these two signals serves as the antenna's transmission signal.

[0057] In a possible implementation, the antenna includes two linearly polarized antenna units that are perpendicular to each other and orthogonal to each other.

[0058] Figure 8 An example of a microstrip antenna is given, such as Figure 8 As shown, the microstrip antenna is provided with two feeding points P1 and P2, which are respectively connected to a linearly polarized antenna unit to provide feeding for the corresponding linearly polarized antenna unit. The line connecting the feeding point P1 and the center of the microstrip antenna and the line connecting the feeding point P2 and the center of the microstrip antenna are perpendicular to each other, and the linear polarization directions of the two linearly polarized antenna units are orthogonal. The two feeding points P1 and P2 are respectively connected to the two output terminals ( Figure 7 As shown in the figure, the first pin 1 of the first directional coupler and the first pin 1 of the second directional coupler are connected.

[0059] like Figure 7 As shown, input port 1 of the feed network is connected to communication port 1 of the RF system via relay unit Port 1, forming a communication path. Connecting communication port 1 of the RF system to relay unit Port 1 ensures that the polarization and elliptical inclination of the electromagnetic wave transmitted by the antenna of the signal receiving device are identical to those of the external signal, ensuring communication between the two devices with minimal antenna polarization loss.

[0060] like Figure 7As shown, the feed network includes a power distribution circuit and a phase shifter. The power distribution circuit includes two parallel power regulation modules. The first end of each power regulation module is connected to the input end 1 of the power distribution circuit (i.e., the input end of the feed network), and the second end of each power regulation module is an output end 2 or 3 of the power distribution circuit. Each output end 2 and 3 of the power distribution circuit is connected to an output end of the feed network through a directional coupler (as mentioned above, the two output ends of the feed network are the first pin 1 of the first directional coupler and the first pin 1 of the second directional coupler, respectively). The output end of each feed network is connected to 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 feed network.

[0061] 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 respectively. The main control unit is used to determine the power distribution ratio and the second phase difference between the transmission signals of the two feeding points based on the signal strength ratio and the first phase difference. In addition, the main control unit adjusts the values ​​of the adjustment units of the power adjustment modules to adjust the output power of the output terminals 2 and 3 of the two power adjustment modules so that the transmission power of the two feeding points reaches the power distribution ratio, that is, the signal strength of the P1 transmission signal / the signal strength of the P2 transmission signal = P; At the same time, the main control unit adjusts the phase shift value of the phase shifter so that the phase difference between the two feeding points is the second phase difference, that is, the phase of the P1 transmitted signal / the phase of the P2 transmitted signal = ψ.

[0062] In an embodiment of the present application, two vertically orthogonal antenna units are arranged on the antenna of the device to decompose the external signal into two vertical components. Based on the analysis results of the two vertical components, the feed network is used to dynamically control the signals transmitted by the two antenna units to synthesize a transmission signal with the same polarization mode and elliptical inclination angle as the external signal. Regardless of how the elliptical polarization mode and elliptical inclination angle of the external electromagnetic wave signal change, the embodiment of the present application can always keep the antenna polarization loss between the two devices at the lowest.

[0063] In one possible implementation, the power regulation module includes a first regulation element and a second regulation element respectively connected to the input end 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 end of the power distribution circuit.

[0064] The embodiment of the present application quickly adjusts the output power of the power regulation module through two adjustment elements on the power regulation module, and can flexibly control the ratio of the output powers of the two power regulation modules.

[0065] In a possible implementation, the first adjustment element is a first adjustment capacitor, and the second adjustment element is an adjustment inductor.

[0066] like Figure 7 As shown, the input end of the power distribution circuit in the feed network is connected to two parallel power regulation modules. The first power regulation module includes a regulation inductor L1 and a regulation capacitor C1 (i.e., a first regulation capacitor). The regulation 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 regulation capacitor C1 is connected to the input end 1 of the power distribution circuit, and the second end of the regulation capacitor C1 is grounded. The second power regulation module includes a regulation inductor L2 and a regulation capacitor C2 (i.e., a first regulation capacitor). The regulation 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 regulation capacitor C2 is connected to the input end 1 of the power distribution circuit, and the second end of the regulation capacitor C2 is grounded.

[0067] The first control pin I1 of the main control unit is used to control the value of the adjustment capacitor C1, the second control pin I2 is used to control the value of the adjustment capacitor C2, the third control pin I3 is used to control the value of the adjustment inductor L1, and the fourth control pin I4 is used to control the value of the adjustment inductor L2.

[0068] Figure 7 In the example, assuming that the impedance of the entire path system is the antenna end impedance Z0 (Z0 is generally 50 ohms), then the impedance of the two output terminals 2 and 3 of the power distribution circuit are both Z0. According to the relationship between parallel impedance and power, if the impedance R2 of the first power regulation module at the branch point (see Figure 7 ) and the impedance R3 of the second power regulation module at the branch point (see Figure 7 ) is R3 / R2= P, then the output power of output terminal 2 / output power of output terminal 3 = P. According to the following series-parallel impedance relationship: R3 / R2= P; R3 R2 / (R3+R2)=Z0; R2=(Z0+jωL1) (1 / (jωC1)) / (Z0+jωL1+1 / (jωC1)); R3=(Z0+jωL2) (1 / (jωC2)) / (Z0+jωL2+1 / (jωC2)).

[0069] Where j is the imaginary unit.

[0070] The main control unit calculates the values ​​of the regulating inductor L1, regulating capacitor C1, regulating inductor L2 and regulating capacitor C2 according to the above formula: L1=Z0 / (ω P 0.5 ); L2=Z0 P 0.5 / ω; C1= P 0.5 / (Z0 ω (1+ P)); C2= P 0.5 / (Z0 ω (1+ P)); Where ω=2πf, f is the antenna operating frequency.

[0071] After obtaining the above values, the main control unit controls the adjustment capacitor C1, the adjustment capacitor C2, the adjustment inductor L1 and the adjustment inductor L2 to the corresponding values ​​through each control pin I1 / I2 / I3 / I4, so as to achieve the output power of output terminal 2 / output power of output terminal 3 = P.

[0072] In another possible implementation, the first adjustment element is a first adjustment capacitor, and the second adjustment element is a fixed inductor and a second adjustment capacitor connected in parallel.

[0073] In this embodiment, a fixed inductor and a second regulating capacitor connected in parallel are used as the second regulating element, replacing Figure 7 The regulating inductor of the medium power regulating module. Figure 7 and Figure 9 Taking the first power regulation module as an example, the second regulation element includes a parallel-connected regulation capacitor C01 (second regulation capacitor) and a fixed inductor L01. This parallel module replaces regulation inductor L1. The second regulation element in the second power regulation module also includes a parallel-connected fixed inductor and a second regulation capacitor.

[0074] Based on the above Figure 7 The derivation result can be used to calculate the value of the adjustment capacitor C01 according to the following circuit parallel admittance relationship: 1 / jωL1=1 / jωL01+jωC01; That is: L1=L01 / (1-ω 2 L01C01).

[0075] Therefore, it can be seen from the above formula that when L01 is the inductance value of the fixed inductor, the inductance value of the adjustable inductor L1 can be adjusted by adjusting the capacitance value of the second adjustable capacitor C01.

[0076] The embodiment of the present application uses a fixed inductor and an adjustable capacitor in parallel as the second adjustment element. Since there are many types of adjustable capacitors to choose from, it is more convenient to design the second adjustment element, thereby reducing the difficulty of designing the feeding network.

[0077] In another possible implementation, the first adjustment element is a first adjustment capacitor, and the second adjustment element is a fixed inductor and a third adjustment capacitor connected in series.

[0078] In this embodiment, a fixed inductor and a third regulating capacitor connected in series are used as the second regulating element, replacing Figure 7 The regulating inductor of the medium power regulating module. Figure 7 and Figure 10 Taking the second power regulation module as an example, the second regulation element includes a fixed inductor L02 and a regulation capacitor C02 (i.e., a third regulation capacitor) connected in series. This series module replaces the regulation inductor L2. The second regulation element in the first power regulation module also includes a fixed inductor and a third regulation capacitor connected in series.

[0079] Based on the above Figure 7 The derivation result can be used to calculate the value of the regulating capacitor C02 according to the following circuit series impedance relationship: jωL2=jωL02+1 / jωC02; That is, L2=L02-(1 / ω 2 C02).

[0080] Therefore, it can be seen from the above formula that when L02 is the inductance value of the fixed inductor, the inductance value of the adjustable inductor L2 can be adjusted by adjusting the capacitance value of the adjustable capacitor C02.

[0081] The embodiment of the present application uses a fixed inductor and an adjustable capacitor connected in series as the second adjustment element. Since there are many types of adjustable capacitors to choose from, it is more convenient to design the second adjustment element, thereby reducing the difficulty of designing the feeding network.

[0082] Based on the above, the power distribution ratio has a large range of variation. For the power distribution circuit, it is necessary to select a first regulating element and a second regulating element with a large adjustment range. This greatly narrows the selection range of the regulating elements and makes the design more difficult.

[0083] Based on the above considerations, in one possible implementation, the feed network further includes a double-pole double-throw (DPDT) switch. The two output terminals of the power distribution circuit are respectively connected to the two input pins of the DPDT switch, and the two output pins of the DPDT switch are respectively connected to the two output terminals of the two feed networks.

[0084] like Figure 7 As shown, the first input pin (first pin 1) and the second input pin (first pin 2) of the double-pole double-throw switch DPDT are respectively connected to the output terminals 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 switch DPDT are respectively connected to the phase shifter (connected to the feed point P1) and the second pin 2 (connected to the feed point P2) of the second directional coupler.

[0085] Specifically, the power distribution ratio When P is the first ratio (for example, greater than 1), the fifth control pin I5 of the main control unit outputs a low level, controlling the first pin 1 and the third pin 3 of the double-pole double-throw switch DPDT to be turned on, and the second pin 2 and the fourth pin 4 of the double-pole double-throw switch DPDT to be turned on. At this time, the output power ratio of the two output ends of the power distribution circuit is the power distribution ratio P.

[0086] In the power distribution ratio When P is the second ratio (for example, less than 1), the fifth control pin I5 of the main control unit outputs a high level, controlling the first pin 1 and the fourth pin 4 of the double-pole double-throw switch DPDT to be turned on, and the second pin 2 and the third pin 3 of the double-pole double-throw switch DPDT to be turned on. At this time, the output power ratio of the two output ends of the power distribution circuit is the inverse of the power distribution ratio (i.e. 1 / P).

[0087] In the embodiment of the present application, a main control unit intelligently controls the output power ratio of the double-pole double-throw switch DPDT to switch the power distribution circuit. On the basis of ensuring that the power distribution ratio of the two feeding points is met, the variation range of the output power ratio of the two output ends of the power distribution circuit is reduced by half, thereby narrowing the adjustment range of the adjustment element in the power distribution circuit, expanding the selection range of the adjustment element, and reducing the design difficulty.

[0088] Based on the above, please refer to Figure 7The third pin 3 of the double-pole double-throw switch (DPDT) is connected to the phase shifter. The other end of the phase shifter is connected to the second pin 2 of the first directional coupler. The first pin 1 of the first directional coupler is connected to the feed point P1. The first and second pins 1 and 2 of the first directional coupler are straight-through pins, so the insertion loss is very small. The phase shifter has a phase shift range of -180° to 180°. The main control unit controls the phase shifter via the sixth control pin I6 to adjust to the corresponding phase shift value, so that the phase difference between the transmitted signals of the two feed points is the second phase difference.

[0089] 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 turned on, and the second pin 2 and the fourth pin 4 are turned on, the main control unit controls the phase shifter through the sixth control pin I6 to adjust the phase shift value to - ψ, ensuring that the power distribution ratio between the transmitted signals of the two feeding points is P, the phase difference is - ψ, has the same signal strength ratio as the received signals at the two feeding points, but with opposite phase differences.

[0090] When the first pin 1 and the fourth pin 4 of the double-pole double-throw switch DPDT are turned on, and the second pin 2 and the third pin 3 are turned on, the main control unit controls the phase shifter through the sixth control pin I6 to adjust the phase shift value to ψ, ensuring that the power distribution ratio between the transmitted signals of the two feeding points is P, the phase difference is - ψ, has the same signal strength ratio as the received signals at the two feeding points, but with opposite phase differences.

[0091] Based on the following Figure 7 An example is given to illustrate the antenna feed control method of the present application: Assume that the signal strength ratio between the received signals at the two feeding points P1 and P2 of the antenna is P=8( P>1), the first phase difference ψ = 70°, antenna operating frequency f = 400MHz, antenna terminal impedance Z0 = 50Ω. The main control unit obtains the following through calculation: ω=2πf; L1=Z0 / (ω P 0.5 )=7.0 (unit: nH); L2=Z0 P 0.5 / ω=56.3 (unit: nH); C1= P 0.5 / (Z0 ω (1+ P))=2.5 (unit: pF); C2= P 0.5 / (Z0 ω (1+ P))=2.5 (unit: pF).

[0092] The main control unit controls the first pin 1 and the third pin 3 of the double-pole double-throw switch DPDT to be turned on, and the second pin 2 and the fourth pin 4 to be turned on, and controls the various adjustment elements of the power distribution circuit through the various control pins to adjust, and controls the phase shift value of the phase shifter to -70°, so that the power distribution ratio between the transmission signals of the two feeding points is the same as the signal strength ratio, and the second phase difference between the transmission signals of the two feeding points is opposite to the first phase difference.

[0093] On this basis, through reverse verification of the values ​​of L1, L2, C1, and C2, we can calculate: R2=(Z0+jωL1) (1 / (jωC1)) / (Z0+jωL1+1 / (jωC1))=56.2 (unit: Ω); R3=(Z0+jωL2) (1 / (jωC2)) / (Z0+jωL2+1 / (jωC2))=450.4 (unit: Ω); P=R3 / R2=450.4 / 56.2=8.0, which is the ratio of the signal strength of the signals received at the above feeding points P1 and P2 P is exactly the same; R3 R2 / (R3+R2)=50.0 (unit: Ω), which is the same as the system impedance (i.e., the antenna end impedance) of 50 Ω, satisfying impedance matching.

[0094] This application designs two vertical orthogonal antenna units on the antenna to detect the signal strength ratio and phase difference of the two vertical components of the electromagnetic wave signal received by the antenna in real time, so as to determine the axial ratio and elliptical inclination of the received signal electromagnetic wave, and utilizes the power distribution circuit and phase shifter of the feeding network on the Port1 communication path to ensure that the power distribution ratio of the transmitted signals of the two antenna units is the same as the signal strength ratio of the two vertical components of the received external signal electromagnetic wave, and the phase difference of the transmitted signals of the two antenna units is opposite to the phase difference of the two vertical components of the received external signal electromagnetic wave, thereby ensuring that the communication antenna of the wireless communication device is completely consistent with the elliptical polarization mode and elliptical inclination of the received signal electromagnetic wave, effectively reducing the polarization loss between the communication antennas and improving the communication performance.

[0095] On the other hand, the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by the computer, the computer can execute the antenna feed control method provided by the above-mentioned embodiments, the method including: receiving the signal strength ratio and the first phase difference between the received signals of the two feeding points of the antenna, the two feeding points respectively receiving one of the vertical components of the external signal; determining the power distribution ratio and the second phase difference between the transmitted signals of the two feeding points 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 feeding network, 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.

[0096] On the other hand, the present application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the antenna feed control method provided in the above-mentioned embodiments, the method comprising: receiving the signal strength ratio and the first phase difference between the received signals of the two feeding points of the antenna, the two feeding points respectively receiving one of the vertical components of the external signal; determining the power distribution ratio and the second phase difference between the transmitted signals of the two feeding points based on 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; using the feeding network, controlling the transmission power of the two feeding points based on the power distribution ratio, and controlling the transmission phase of the two feeding points based on the second phase difference.

[0097] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0098] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on this understanding, the above technical solution, in essence, or the part that contributes to the prior art, 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 for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An antenna feed control method, characterized in that: Applicable to main control unit, including: a signal strength ratio and a first phase difference between received signals at two feeding points of the receiving antenna, wherein the two feeding points respectively receive one vertical component of the external signal; Determining a power distribution ratio and a second phase difference between the transmission signals of the two feeding 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; The feeding network is utilized to control the transmission power of the two feeding points according to the power allocation ratio, and the transmission phases of the two feeding points are controlled according to the second phase difference.

2. The antenna feed control method according to claim 1, wherein: The antenna includes two linearly polarized antenna units that are perpendicular to each other.

3. The antenna feed control method according to claim 1, wherein: Controlling the transmission power of the two feeding points according to the power allocation ratio specifically includes: Determining a value of a regulating element in a power distribution circuit of the feed network according to the power distribution ratio; Controlling the regulating element to adjust the value so that the ratio of the output power between the two output ends of the feeding network is the same as the power distribution ratio between the feeding points connected to the two output ends of the feeding network; Wherein, each output end of the power distribution circuit is connected to an output end of the feed network, and each output end of the feed network is connected to one of the feed points.

4. The antenna feed control method according to claim 3, wherein: Controlling the transmission power of the two feeding points according to the power allocation ratio further includes: When the power distribution ratio is a first ratio, controlling the first and third pins of the double-pole double-throw switch of the feed network to be turned on, and the second and fourth pins of the double-pole double-throw switch to be turned on, at this time, the output power ratio of the two output ends of the power distribution circuit is the power distribution ratio; When the power distribution ratio is the second ratio, controlling the first and fourth pins of the double-pole double-throw switch to be turned on, and the second and third pins of the double-pole double-throw switch to be turned on, at this time, the output power ratio of the two output ends of the power distribution circuit is the inverse of the power distribution ratio; Particularly, the first pin of the double-pole double-throw switch is connected to the output end of the first power regulation module, the second pin of the double-pole double-throw switch is connected to the output end of the second power regulation module, the third pin of the double-pole double-throw switch is connected to the output end of the feed network corresponding to the first feeding point, and the fourth pin of the double-pole double-throw switch is connected to the output end of the feed 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.

5. An antenna feed control circuit, characterized in that: Including radio frequency system, main control unit and feeding network; The two signal detection ends of the radio frequency system are respectively connected to the two feeding points of the antenna, and the signal output end 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 of the two feeding points, and the two feeding points respectively receive one vertical component of the external signal; The input end of the feed network is communicatively connected to the RF system, and the feed network includes a power distribution circuit and a phase shifter; the power distribution circuit includes two parallel power regulation modules, a first end of each of the power regulation modules is connected to the input end of the power distribution circuit, and a second end of each of the power regulation modules is an output end of the power distribution circuit, each output end of the power distribution circuit is respectively connected to an output end of the feed network, and each output end of the feed network is connected to one of the feed points; the phase shifter is arranged between one of the output ends of the power distribution circuit and the corresponding output end of the feed network; The main control unit is connected to the phase shifter and the regulating units of the two power regulating modules respectively.

6. The antenna feed control circuit according to claim 5, characterized in that: The power regulation module includes a first regulation element and a second regulation element respectively connected to the input end 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 end of the power distribution circuit.

7. The antenna feed control circuit according to claim 6, characterized in that: The first regulating element is a first regulating capacitor.

8. The antenna feed control circuit according to claim 6 or 7, characterized in that: The second regulating 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 adjustment capacitor are connected in series.

9. The antenna feed control circuit according to claim 6, wherein: The two output ends of the power distribution circuit are respectively connected to the two input pins of a double-pole double-throw switch, and the two output pins of the double-pole double-throw switch are respectively connected to the two output ends of the feed network.

10. The antenna feed control circuit according to claim 5, characterized in that: The two signal detection ends of the radio frequency system are respectively connected to the two feeding points through directional couplers, the first pin of the directional coupler is connected to the feeding point, the second pin of the directional coupler is connected to an output end of the power distribution circuit, the third pin of the directional coupler is connected to a signal detection end of the radio frequency system, and the fourth pin of the directional coupler is connected to the load; the first pin of the directional coupler and the second pin of the directional coupler are through pins.

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