Circularly polarized antenna and intelligent terminal

Abstract

The invention is suitable for the technical field of antennas, and provides a circularly polarized antenna and an intelligent terminal.The circularly polarized antenna comprises an annular radiator and a first feed terminal, the radiator is provided with a first breakpoint, and the first breakpoint is connected with a first capacitor or a first inductor in series; one end of the first feed terminal is electrically connected with the radiator, and the other end of the first feed terminal is electrically connected with a first feed module of the mainboard. When the first breakpoint on the radiator is connected in series with a capacitor or an inductor, the resonant frequencies of a first mode and a second mode which are excited by the radiator and are perpendicular to each other are changed, so that the difference value between the resonant phase of the first mode and the resonant phase of the second mode reaches 90 degrees, circular polarization is realized, and the satellite positioning performance is improved.

Description

Circularly polarized antenna and smart terminal Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a circularly polarized antenna and a smart terminal. Background Art

[0002] With the development of smart devices (such as mobile phones, wearable devices, and computers), satellite positioning has become one of their primary functions. Satellite positioning antennas are essential for achieving satellite positioning and tracking. To enhance satellite-to-ground transmission efficiency (for example, improving penetration and coverage), the satellite's transmitting antenna toward the ground uses circular polarization. Similarly, to enhance the positioning antenna's reception capability, the terminal device's receiving antenna should also use the same circular polarization as the transmitting antenna.

[0003] However, in related technologies, it is difficult for smart terminals to implement circularly polarized antennas due to limitations in size or industrial design. Instead, linearly polarized antennas are commonly used, which results in poor satellite positioning performance of smart terminals. Technical issues

[0004] One of the objectives of the embodiments of the present application is to provide a circularly polarized antenna and a smart terminal to solve the problem of poor satellite positioning performance caused by the use of a linearly polarized antenna in a terminal device. Technical Solutions

[0005] The technical solution adopted in the embodiment of this application is:

[0006] In a first aspect, an embodiment of the present application provides a circularly polarized antenna, comprising:

[0007] a ring-shaped radiator, wherein a first breakpoint is formed on the radiator, and a first capacitor or a first inductor is connected in series to the first breakpoint; and

[0008] A first feeding terminal has one end electrically connected to the radiator and the other end electrically connected to the first feeding module of the mainboard.

[0009] In a second aspect, a smart terminal is provided, comprising the circularly polarized antenna described in the first aspect. Beneficial effects

[0010] The beneficial effect of the first aspect provided by the embodiment of the present application is that: the circularly polarized antenna provided by the embodiment of the present application includes a ring-shaped radiator and a first feeding terminal, wherein a first breakpoint is opened on the radiator, a first capacitor or a first inductor is connected in series at the first breakpoint, one end of the first feeding terminal is electrically connected to the radiator, and the other end of the first feeding terminal is electrically connected to the first feeding module of the mainboard.

[0011] When a capacitor is connected in series at the first breakpoint on the radiator, the equivalent distributed inductance of the radiator decreases due to the offsetting effect of the capacitor, and the resonant frequency of the first mode and the resonant frequency of the second mode of the radiator both increase. The resonant current of the first mode of the radiator and the resonant current of the second mode of the radiator are perpendicular to each other. When the first breakpoint is located in the current weak region of the first mode and the current strong region of the second mode, for the first mode, the series capacitor has a small effect on the original current distribution of the radiator, and the increase in the resonant frequency of the first mode of the radiator is small. For the second mode, the series capacitor has a large effect on the original current distribution of the radiator, and the increase in the resonant frequency of the second mode of the radiator is large. By adjusting the position of the first breakpoint and / or the capacitance value of the capacitor, the difference between the resonant phase of the first mode and the resonant phase of the second mode reaches 90°, at which point the radiator forms a circularly polarized antenna.

[0012] When an inductor is connected in series at the first breakpoint on the radiator, the inductance of the radiator's equivalent distributed inductance increases, the resonant frequency of the radiator's first mode and the resonant frequency of the second mode both decrease, and the resonant current of the radiator's first mode and the resonant current of the radiator's second mode are perpendicular to each other. When the first breakpoint is located in the current weak region of the first mode and the current strong region of the second mode, for the first mode, the series inductor has a small effect on the original current distribution of the radiator, and the reduction in the resonant frequency of the radiator's first mode is small. For the second mode, the series inductor has a large effect on the original current distribution of the radiator, and the reduction in the resonant frequency of the radiator's second mode is large. By adjusting the position of the first breakpoint and / or the inductance of the inductor, the difference between the resonant phase of the first mode and the resonant phase of the second mode reaches 90°, at which point the radiator forms a circularly polarized antenna.

[0013] From this, it can be seen that when a capacitor or inductor is connected in series at the first breakpoint on the radiator, the resonant frequencies of the mutually perpendicular first mode and second mode excited on the radiator will change, so that the difference between the resonant phase of the first mode and the resonant phase of the second mode reaches 90°, thereby realizing circular polarization.

[0014] Therefore, the circularly polarized antenna provided in the embodiment of the present application only needs to use one annular radiator, which reduces the number of radiators and reduces the space occupied by the circularly polarized antenna, contributes to the miniaturization design of the smart terminal, and improves the satellite positioning performance of the terminal device.

[0015] The beneficial effects of the second aspect provided by the embodiment of the present application are the same as the beneficial effects of the first aspect mentioned above, please refer to the beneficial effects of the first aspect mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only 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] FIG1 is a schematic diagram of the resonant frequencies of a complete annular radiator in a first mode and a second mode provided by an embodiment of the present application;

[0018] FIG2 is a schematic diagram of the three-dimensional structure of a circularly polarized antenna provided in one embodiment of the present application;

[0019] FIG3 is a schematic structural diagram of a circularly polarized antenna provided in one embodiment of the present application;

[0020] FIG4 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0021] FIG5 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0022] FIG6 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0023] FIG7 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0024] FIG8 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0025] FIG9 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0026] FIG10 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0027] FIG11 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0028] FIG12 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0029] FIG13 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application.

[0030] In the figure: 100, radiator; 101, strong current area; 102, weak current area; 200, first feeding terminal; 300, first breakpoint; 400, mainboard; 500, second breakpoint; 600, second feeding terminal. Modes for Carrying Out the Invention

[0031] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0032] It should be noted that the various steps described in the method implementation of the present application can be executed in different orders and / or in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present application is not limited in this respect. The term "including" and its variations used herein are open inclusions, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0033] As shown in FIG1 , when there are no discontinuities on the radiator 100 , that is, the radiator 100 is a complete circular ring, the resonant current of the first mode of the radiator 100 (such as A in FIG1 ) and the resonant current of the second mode of the radiator 100 (such as B in FIG1 ) are perpendicular to each other, have the same amplitude, and have the same phase (that is, the same resonant frequency). At this time, the radiator 100 is equivalent to a linearly polarized antenna.

[0034] The resonant current of the radiator 100 in the first mode is shown in A in Figure 1 . A in Figure 1 only illustrates the resonant current flowing from top to bottom; the resonant current can also flow from bottom to top. The density of the arrows in A in Figure 1 represents the magnitude of the current. The areas with dense arrows are high current regions 101, and the areas outside of high current regions 101 are low current regions 102. Each low current region 102 contains a current zero point. Therefore, in the first mode, the radiator 100 includes two high current regions 101 and two low current regions 102.

[0035] The resonant current of the radiator 100 in the second mode is shown in B in Figure 1 . B in Figure 1 only illustrates the resonant current flowing from the top to the right; the resonant current can also flow from the bottom right to the left. The density of the arrows in B in Figure 1 represents the magnitude of the current. The areas with dense arrows are high current regions 101, and the areas outside of high current regions 101 are low current regions 102. Each low current region 102 contains a current zero point. Therefore, in the second mode, the radiator 100 includes two high current regions 101 and two low current regions 102.

[0036] As shown in Figure 2, the circularly polarized antenna includes a ring-shaped radiator 100 and a first feeding terminal 200, wherein a first breakpoint 300 is opened on the radiator 100, and a first capacitor C1 or a first inductor L1 is connected in series at the first breakpoint 300. One end of the first feeding terminal 200 is electrically connected to the radiator 100, and the other end of the first feeding terminal 200 is electrically connected to the first feeding module of the mainboard 400.

[0037] Specifically, the radiator 100 is arranged parallel to and above the mainboard 400, with a certain distance between the radiator 100 and the mainboard 400. The distance between the radiator 100 and the mainboard 400 can be set according to actual needs. For example, the distance between the radiator 100 and the mainboard 400 can be set to 2-5 mm. The mainboard 400 is the main PCB (Printed Circuit Board) of the smart terminal, and is integrated with the processor and corresponding feeding module. The radiator 100 and the mainboard 400 are electrically connected via the first feeding terminal 200, thereby forming an antenna structure. The connection point between the first feeding terminal 200 and the radiator 100 is called the feeding point. The feeding point is located at a location where the resonant current of the first mode and the resonant current of the second mode of the radiator 100 are close. Preferably, the feeding point is located at a location where the resonant current or electric field of the first and second modes of the radiator 100 are equal. The length of the first breakpoint 300 can be set according to actual needs. For example, the length of the first breakpoint 300 is set to 3-5 mm. The first capacitor C1 or the first inductor L1 can be set on the mainboard 400, or the first capacitor C1 and the first sensor can be set at the first breakpoint 300.

[0038] In some embodiments, the radiator 100 may be made of conductive materials such as metals and alloys.

[0039] As shown in Figure 3, when a first capacitor C1 is connected in series at a first breakpoint 300 on the radiator 100, the equivalent distributed inductance of the radiator 100 decreases due to the capacitor's offsetting effect, increasing the resonant frequency of both the first and second modes of the radiator 100. The resonant current of the first and second modes of the radiator 100 are perpendicular to each other. When the first breakpoint 300 is located in the weak current region 102 of the first mode and the strong current region 101 of the second mode, the first capacitor C1 in series with the radiator 100 has minimal effect on the original current distribution of the radiator 100 in the first mode, resulting in a minimal increase in the resonant frequency of the first mode of the radiator 100. For the second mode, the first capacitor C1 connected in series has a significant effect on the original current distribution of the radiator 100, and the resonant frequency of the second mode of the radiator 100 increases significantly. By adjusting the position of the first breakpoint 300 and / or the capacitance value of the first capacitor C1, the difference between the resonant phase of the first mode and the resonant phase of the second mode reaches 90°. At this time, the radiator 100 forms a circularly polarized antenna.

[0040] As shown in FIG4 , when the first capacitor C1 is connected in series at the first breakpoint 300 , the line connecting the first feeding terminal 200 and the center point of the radiator 100 is a first line, and the line connecting the first breakpoint 300 and the center point of the radiator 100 is a second line. The counterclockwise direction facing the upper surface of the radiator 100 is a first direction. Along the first direction, a first angle α is formed between the first line and the second line, where α∈(0,π / 2)∪(π,3π / 2); alternatively, α∈(π / 2,π)∪(3π / 2,2π).

[0041] Specifically, the line connecting the first feeding terminal 200 and the center point of the radiator 100 is the first line, that is, the line connecting the feeding point (the contact point between the first feeding terminal 200 and the radiator 100) and the center point of the radiator 100 is the first line. Since the length of the first break point 300 is very small, the line connecting the first break point 300 and the center point of the radiator 100 can be used as the second line. Preferably, the line connecting the center point of the first break point 300 and the center point of the radiator 100 can be used as the second line.

[0042] When α∈(0,π / 2)∪(π,3π / 2), first breakpoint 300 is located at the intersection of weak current region 102 of the first mode and strong current region 101 of the second mode of radiator 100. That is, first capacitor C1 is connected in series at the intersection of weak current region 102 of the first mode and strong current region 101 of the second mode of radiator 100. The resonant frequency of the first mode of radiator 100 increases slightly, while the resonant frequency of the second mode of radiator 100 increases significantly. Ultimately, the difference between the resonant phases of the first mode and the second mode reaches 90°, forming a circularly polarized antenna.

[0043] When α∈(π / 2,π)∪(3π / 2,2π), first breakpoint 300 is located at the intersection of strong current region 101 of the first mode and weak current region 102 of the second mode of radiator 100. That is, first capacitor C1 is connected in series at the intersection of strong current region 101 of the first mode and weak current region 102 of the second mode of radiator 100. The resonant frequency of the first mode of radiator 100 increases significantly, while the resonant frequency of the second mode of radiator 100 increases slightly. Ultimately, the difference between the resonant phases of the first mode and the second mode reaches 90°, forming a circularly polarized antenna.

[0044] When α∈(0,π / 2)∪(π,3π / 2), the circularly polarized antenna is a right-hand circularly polarized antenna; when α∈(π / 2,π)∪(3π / 2,2π), the circularly polarized antenna is a left-hand circularly polarized antenna. Preferably, α∈(0,π / 3)∪(π,4π / 3); or, α∈(2π / 3,π)∪(5π / 3,2π).

[0045] As shown in Figure 5, when the first inductor L1 is connected in series at the first breakpoint 300 on the radiator 100, the equivalent distributed inductance of the radiator 100 increases, the resonant frequency of the first mode and the resonant frequency of the second mode of the radiator 100 both decrease, and the resonant current of the first mode and the resonant current of the second mode of the radiator 100 are perpendicular to each other. When the first breakpoint 300 is located in the weak current region 102 of the first mode and the strong current region 101 of the second mode, the first inductor L1 in series with the radiator 100 has little effect on the original current distribution of the radiator 100 in the first mode, and the reduction in the resonant frequency of the first mode of the radiator 100 is minimal. For the second mode, the first inductor L1 connected in series has a significant effect on the original current distribution of the radiator 100, and the resonant frequency of the second mode of the radiator 100 decreases significantly. By adjusting the position of the first breakpoint 300 and / or the inductance value of the first inductor L1, the difference between the resonant phase of the first mode and the resonant phase of the second mode reaches 90°. At this time, the radiator 100 forms a circularly polarized antenna.

[0046] As shown in FIG6 , when the first inductor L1 is connected in series at the first breakpoint 300 , the line connecting the first feeding terminal 200 and the center point of the radiator 100 is a first line, the line connecting the first breakpoint 300 and the center point of the radiator 100 is a second line, and the counterclockwise direction facing the upper surface of the radiator 100 is a first direction. Along the first direction, a first angle α is formed between the first line and the second line; wherein α∈(0,π / 2)∪(π,3π / 2); or, α∈(π / 2,π)∪(3π / 2,2π).

[0047] Specifically, the line connecting the first feeding terminal 200 and the center point of the radiator 100 is the first line, that is, the line connecting the feeding point (the contact point between the first feeding terminal 200 and the radiator 100) and the center point of the radiator 100 is the first line. Since the length of the first break point 300 is very small, the line connecting the first break point 300 and the center point of the radiator 100 can be used as the second line. Preferably, the line connecting the center point of the first break point 300 and the center point of the radiator 100 can be used as the second line.

[0048] When α∈(0,π / 2)∪(π,3π / 2), the first breakpoint 300 is located at the intersection of the weak current region 102 of the first mode and the strong current region 101 of the second mode of the radiator 100. That is, the first inductor L1 is connected in series at the intersection of the weak current region 102 of the first mode and the strong current region 101 of the second mode of the radiator 100. The decrease in the resonant frequency of the first mode of the radiator 100 is relatively small, while the decrease in the resonant frequency of the second mode of the radiator 100 is relatively large. Ultimately, the difference between the resonant phases of the first mode and the second mode reaches 90°, forming a circularly polarized antenna.

[0049] When α∈(π / 2, π)∪(3π / 2, 2π), the first breakpoint 300 is located at the intersection of the strong current region 101 of the first mode and the weak current region 102 of the second mode of the radiator 100. That is, the first inductor L1 is connected in series at the intersection of the strong current region 101 of the first mode and the weak current region 102 of the second mode of the radiator 100. The resonant frequency of the first mode of the radiator 100 decreases significantly, while the resonant frequency of the second mode of the radiator 100 decreases less. Ultimately, the difference between the resonant phases of the first mode and the second mode reaches 90°, forming a circularly polarized antenna.

[0050] When α∈(0,π / 2)∪(π,3π / 2), the circularly polarized antenna is a left-hand circularly polarized antenna; when α∈(π / 2,π)∪(3π / 2,2π), the circularly polarized antenna is a right-hand circularly polarized antenna. Preferably, α∈(0,π / 3)∪(π,4π / 3); or, α∈(2π / 3,π)∪(5π / 3,2π).

[0051] In one embodiment of the present application, a second breakpoint 500 is further defined on the radiator 100 , and a second capacitor C2 or a second inductor L2 is connected in series to the second breakpoint 500 .

[0052] Specifically, a first breakpoint 300 and a second breakpoint 500 are provided on the radiator 100 , and capacitors or inductors can be connected in series at the first breakpoint 300 and the second breakpoint 500 . In this case, the circularly polarized antenna can be implemented in the following three ways.

[0053] First implementation: As shown in FIG7 , a first capacitor C1 is connected in series at the first breakpoint 300, and a second capacitor C2 is connected in series at the second breakpoint 500. The first capacitor C1 and the second capacitor C2 may be symmetrically arranged about the center of the radiator 100, or they may not be symmetrically arranged about the center of the radiator 100. The first breakpoint 300 and the second breakpoint 500 are both arranged at the intersection of the weak current region 102 of the first mode and the strong current region 101 of the second mode of the radiator 100. That is, the first capacitor C1 and the second capacitor C2 are both connected in series at the intersection of the weak current region 102 of the first mode and the strong current region 101 of the second mode of the radiator 100. Preferably, the first breakpoint 300 and the second breakpoint 500 can be both arranged at the point where the current of the first mode is minimum and the current of the second mode is maximum, which makes it easier to achieve a 90° difference between the resonant phase of the first mode and the resonant phase of the second mode, thereby forming the radiator 100 into a circularly polarized antenna.

[0054] A line connecting the first feeding terminal 200 and the center point of the radiator 100 is a first line, a line connecting the first breakpoint 300 and the center point of the radiator 100 is a second line, and a line connecting the second breakpoint 500 and the center point of the radiator 100 is a third line. The counterclockwise direction facing the upper surface of the radiator 100 is a first direction. Along the first direction, the first line and the second line form a first angle α, where α∈(0,π / 2)∪(π,3π / 2), or α∈(π / 2,π)∪(3π / 2,2π); the first line and the third line form a second angle β, where β∈(0,π / 2)∪(π,3π / 2), or β∈(π / 2,π)∪(3π / 2,2π). Preferably, β∈(0,π / 3)∪(π,4π / 3); or β∈(2π / 3,π)∪(5π / 3,2π).

[0055] When α∈(0,π / 2)∪(π,3π / 2) and β∈(0,π / 2)∪(π,3π / 2), the circularly polarized antenna is a right-hand circularly polarized antenna.

[0056] When α∈(π / 2,π)∪(3π / 2,2π) and β∈(π / 2,π)∪(3π / 2,2π), the circularly polarized antenna is a left-handed circularly polarized antenna.

[0057] When α∈(0,π / 2)∪(π,3π / 2) and β∈(π / 2,π)∪(3π / 2,2π), the first capacitor C1 causes the radiator 100 to form a right-hand circularly polarized antenna, and the second capacitor C2 causes the radiator 100 to form a left-hand circularly polarized antenna. If the first capacitor C1's ability to pull the current in the radiator 100 into right-hand circular polarization is stronger than the second capacitor C2's ability to pull the current in the radiator 100 into left-hand circular polarization, the radiator 100 ultimately forms a right-hand circularly polarized antenna. Conversely, the radiator 100 ultimately forms a left-hand circularly polarized antenna.

[0058] When α∈(π / 2,π)∪(3π / 2,2π) and β∈(0,π / 2)∪(π,3π / 2), the first capacitor C1 causes the radiator 100 to form a left-handed circularly polarized antenna, and the second capacitor C2 causes the radiator 100 to form a right-handed circularly polarized antenna. If the first capacitor C1's ability to pull the current in the radiator 100 into left-handed circular polarization is stronger than the second capacitor C2's ability to pull the current in the radiator 100 into right-handed circular polarization, the radiator 100 ultimately forms a left-handed circularly polarized antenna. Conversely, the radiator 100 ultimately forms a right-handed circularly polarized antenna.

[0059] In a second implementation, as shown in FIG8 , a first inductor L1 is connected in series at a first breakpoint 300, and a second inductor L2 is connected in series at a second breakpoint 500. The first inductor L1 and the second inductor L2 may be arranged symmetrically about the center of the radiator 100, or not. The first breakpoint 300 and the second breakpoint 500 are both located at the intersection of the weak current region 102 of the first mode and the strong current region 101 of the second mode of the radiator 100. That is, the first inductor L1 and the second inductor L2 are both connected in series at the intersection of the weak current region 102 of the first mode and the strong current region 101 of the second mode of the radiator 100. Preferably, the first breakpoint 300 and the second breakpoint 500 can be both located at the point where the current of the first mode is minimum and the current of the second mode is maximum, which makes it easier to achieve a 90° difference between the resonant phase of the first mode and the resonant phase of the second mode, thereby forming the radiator 100 into a circularly polarized antenna.

[0060] A line connecting the first feeding terminal 200 and the center point of the radiator 100 is a first line, a line connecting the first breakpoint 300 and the center point of the radiator 100 is a second line, and a line connecting the second breakpoint 500 and the center point of the radiator 100 is a third line. The counterclockwise direction facing the upper surface of the radiator 100 is a first direction. Along the first direction, the first line and the second line form a first angle α, where α∈(0,π / 2)∪(π,3π / 2), or α∈(π / 2,π)∪(3π / 2,2π); the first line and the third line form a second angle β, where β∈(0,π / 2)∪(π,3π / 2), or β∈(π / 2,π)∪(3π / 2,2π).

[0061] When α∈(0,π / 2)∪(π,3π / 2) and β∈(0,π / 2)∪(π,3π / 2), the circularly polarized antenna is a left-handed circularly polarized antenna.

[0062] When α∈(π / 2,π)∪(3π / 2,2π) and β∈(π / 2,π)∪(3π / 2,2π), the circularly polarized antenna is a right-hand circularly polarized antenna.

[0063] When α∈(0,π / 2)∪(π,3π / 2) and β∈(π / 2,π)∪(3π / 2,2π), the first inductor L1 causes the radiator 100 to form a left-handed circularly polarized antenna, while the second inductor L2 causes the radiator 100 to form a right-handed circularly polarized antenna. If the first inductor L1's ability to pull the current in the radiator 100 into left-handed circular polarization is stronger than the second inductor L2's ability to pull the current in the radiator 100 into right-handed circular polarization, the radiator 100 ultimately forms a left-handed circularly polarized antenna. Conversely, the radiator 100 ultimately forms a right-handed circularly polarized antenna.

[0064] When α∈(π / 2,π)∪(3π / 2,2π) and β∈(0,π / 2)∪(π,3π / 2), the first inductor L1 causes the radiator 100 to form a right-handed circularly polarized antenna, while the second inductor L2 causes the radiator 100 to form a left-handed circularly polarized antenna. If the first inductor L1's ability to pull the current in the radiator 100 into right-handed circular polarization is stronger than the second inductor L2's ability to pull the current into left-handed circular polarization, the radiator 100 ultimately forms a right-handed circularly polarized antenna. Conversely, the radiator 100 ultimately forms a left-handed circularly polarized antenna.

[0065] In a third implementation, as shown in FIG9 , a first inductor L1 is connected in series at a first breakpoint 300, and a second capacitor C2 is connected in series at a second breakpoint 500. The first breakpoint 300 and the second breakpoint 500 are respectively disposed at the intersection of the weak current region 102 of the first mode and the strong current region 101 of the second mode of the radiator 100. That is, the first inductor L1 and the second capacitor C2 are respectively connected in series at the intersection of the weak current region 102 of the first mode and the strong current region 101 of the second mode of the radiator 100. Preferably, the first breakpoint 300 and the second breakpoint 500 can be disposed at the point where the current of the first mode is minimum and the current of the second mode is maximum, respectively, to more easily achieve a 90° difference between the resonant phase of the first mode and the resonant phase of the second mode, thereby forming the radiator 100 into a circularly polarized antenna.

[0066] A line connecting the first feeding terminal 200 and the center point of the radiator 100 is a first line, a line connecting the first breakpoint 300 and the center point of the radiator 100 is a second line, and a line connecting the second breakpoint 500 and the center point of the radiator 100 is a third line. The counterclockwise direction facing the upper surface of the radiator 100 is a first direction. Along the first direction, the first line and the second line form a first angle α, where α∈(0,π / 2)∪(π,3π / 2), or α∈(π / 2,π)∪(3π / 2,2π); the first line and the third line form a second angle β, where β∈(0,π / 2)∪(π,3π / 2), or β∈(π / 2,π)∪(3π / 2,2π).

[0067] When α∈(0,π / 2)∪(π,3π / 2) and β∈(π / 2,π)∪(3π / 2,2π), the circularly polarized antenna is a left-handed circularly polarized antenna.

[0068] When α∈(π / 2,π)∪(3π / 2,2π) and β∈(0,π / 2)∪(π,3π / 2), the circularly polarized antenna is a right-hand circularly polarized antenna.

[0069] When α∈(0,π / 2)∪(π,3π / 2) and β∈(0,π / 2)∪(π,3π / 2), the first inductor L1 causes the radiator 100 to form a left-handed circularly polarized antenna, while the second capacitor C2 causes the radiator 100 to form a right-handed circularly polarized antenna. If the first inductor L1's ability to pull the current in the radiator 100 into left-handed circular polarization is stronger than the second capacitor C2's ability to pull the current in the radiator 100 into right-handed circular polarization, the radiator 100 ultimately forms a left-handed circularly polarized antenna. Conversely, the radiator 100 ultimately forms a right-handed circularly polarized antenna.

[0070] When α∈(π / 2,π)∪(3π / 2,2π) and β∈(π / 2,π)∪(3π / 2,2π), the first inductor L1 causes the radiator 100 to form a right-handed circularly polarized antenna, while the second capacitor C2 causes the radiator 100 to form a left-handed circularly polarized antenna. If the first inductor L1's ability to pull the current in the radiator 100 into right-handed circular polarization is stronger than the second capacitor C2's ability to pull the current in the radiator 100 into left-handed circular polarization, the radiator 100 ultimately forms a right-handed circularly polarized antenna. Conversely, the radiator 100 ultimately forms a left-handed circularly polarized antenna.

[0071] In one embodiment of the present application, at least one third breakpoint is further defined on the radiator 100 , and a third capacitor or a third inductor is connected in series to the third breakpoint.

[0072] Specifically, the radiator 100 includes a first breakpoint 300, a second breakpoint 500, and at least one third breakpoint. A first capacitor C1 or a first inductor L1 can be connected in series at the first breakpoint 300, a second capacitor C2 or a second inductor L2 can be connected in series at the second breakpoint 500, and a third capacitor and a third inductor can be connected in series at each third breakpoint. By adjusting the positions of the first breakpoint 300, the second breakpoint 500, and the third breakpoints on the radiator 100, and / or adjusting the capacitance values ​​of the capacitors and the inductance values ​​of the inductors connected in series at the breakpoints, the difference between the resonant phase of the first mode and the resonant phase of the second mode can be increased to 90°, thereby forming the radiator 100 into a circularly polarized antenna. For the specific design principles, please refer to the description of the first breakpoint 300 and the second breakpoint 500 on the radiator 100, which will not be repeated here.

[0073] As shown in Figure 10, the circularly polarized antenna also includes a first filter RC1, which is used to filter signals of other communication frequency bands except the second communication frequency band signal. The second communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the second capacitor C2, or the second communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the second inductor L2.

[0074] Specifically, the first filter RC1 is used to filter signals of other communication frequency bands except the second communication frequency band signal. At this time, the second communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the second capacitor C2, or the second communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the second inductor L2.

[0075] At this time, the first communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the second capacitor C2, or the first communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the second inductor L2, or the first communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the second capacitor C2, or the first communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the second inductor L2.

[0076] Therefore, the second communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the second capacitor C2, or the second communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the second inductor L2.

[0077] The first communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the second capacitor C2, or the first communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the second inductor L2, or the first communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the second inductor C2, or the first communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the second inductor L2.

[0078] It can be seen from this that the first communication frequency band signal and the second communication frequency band signal do not interfere with each other. By adjusting the capacitance value of the first capacitor C1 or the inductance value of the first inductor L1 at the first breakpoint 300, and / or adjusting the capacitance value of the second capacitor C2 or the inductance value of the second inductor L2 at the second breakpoint 500, the circular polarization characteristics of the first communication frequency band signal and the second communication frequency band signal can be adjusted, and ultimately the radiator 100 forms a dual-frequency circularly polarized antenna.

[0079] Exemplarily, the first filter RC1 is connected in parallel with the first capacitor C1 (as shown in FIG10 ), or the first filter RC1 is connected in parallel with the first inductor L1 (not shown in the figure). The first filter RC1 can be a bandpass filter.

[0080] As shown in Figure 11, the circularly polarized antenna also includes a second filter RC2, which is used to filter signals of other communication frequency bands except the first communication frequency band signal. The first communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the first capacitor C1, or the first communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the first inductor L1.

[0081] Specifically, the second filter RC2 is used to filter signals of other communication frequency bands except the first communication frequency band signal. At this time, the signal of the first communication frequency band refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the first capacitor C1, or the signal of the first communication frequency band refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the first inductor L1.

[0082] The first filter RC1 is used to filter signals of other communication frequency bands except the second communication frequency band signal. At this time, the second communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the second capacitor C2, or the second communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the second inductor L2.

[0083] Therefore, signals in the first communication frequency band can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, and the first capacitor C1, or signals in the first communication frequency band can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, and the first inductor L1. Signals in the second communication frequency band can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, and the second capacitor C2, or signals in the second communication frequency band can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, and the second inductor L2.

[0084] It can be seen from this that the signals in the first communication frequency band and the signals in the second communication frequency band do not interfere with each other. By adjusting the capacitance value of the first capacitor C1 or the inductance value of the first inductor L1 at the first breakpoint 300, and / or adjusting the capacitance value of the second capacitor C2 or the inductance value of the second inductor L2 at the second breakpoint 500, the circular polarization characteristics of the signals in the first communication frequency band and the second communication frequency band can be adjusted, and ultimately the radiator 100 forms a dual-frequency circularly polarized antenna.

[0085] Exemplarily, the second filter RC2 is connected in parallel with the second capacitor C2 (as shown in FIG11 ), or the second filter RC2 is connected in parallel with the first inductor L1 (not shown in the figure). The second filter RC2 can be a bandpass filter.

[0086] In one embodiment of the present application, the circularly polarized antenna also includes a third filter, which is used to filter signals of other communication frequency bands except the third communication frequency band signal, the first filter is used to filter signals of other communication frequency bands except the second communication frequency band signal, and the second filter is used to filter signals of other communication frequency bands except the first communication frequency band signal.

[0087] At this time, the first communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the third capacitor, or the first communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the third inductor, or the first communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the third capacitor, or the first communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the third inductor.

[0088] The second communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the second inductor L2 and the third capacitor, or the second communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the second inductor L2 and the third inductor, or the second communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the second capacitor C2 and the third capacitor, or the second communication frequency band signal refers to the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the second capacitor C2 and the third inductor.

[0089] The third communication frequency band signal refers to a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the second inductor L2, or the third communication frequency band signal refers to a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the second capacitor C2, or the third communication frequency band signal refers to a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the second inductor L2, or the third communication frequency band signal refers to a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the second capacitor C2.

[0090] Therefore, the first communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the third capacitor, or the first communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the third inductor, or the first communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the third capacitor, or the first communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the third inductor.

[0091] The second communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the second inductor L2 and the third capacitor, or the second communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the second inductor L2 and the third inductor, or the second communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the second capacitor C2 and the third capacitor, or the second communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the second capacitor C2 and the third inductor.

[0092] The third communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the second inductor L2, or the third communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first inductor L1 and the second capacitor C2, or the third communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the second inductor L2, or the third communication frequency band signal can only pass through the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100, the first capacitor C1 and the second capacitor C2.

[0093] It can be seen from this that the first communication frequency band signal, the second communication frequency band signal and the third communication frequency band signal do not interfere with each other. By adjusting the capacitance value of the first capacitor C1 or the inductance value of the first inductor L1 at the first breakpoint 300, and / or adjusting the capacitance value of the second capacitor C2 or the inductance value of the second inductor L2 at the second breakpoint 500, and / or adjusting the capacitance value of the third capacitor or the inductance value of the third inductor at the third breakpoint, the circular polarization characteristics of the first communication frequency band signal, the second communication frequency band signal and the third communication frequency band signal can be adjusted, and ultimately the radiator 100 forms a three-band circularly polarized antenna.

[0094] Exemplarily, the third filter is connected in parallel with the third capacitor, or the third filter is connected in parallel with the third inductor.

[0095] Similarly, more than three breakpoints can be set on the radiator 100, and a capacitor or inductor can be connected in series at each breakpoint, and a filter can be connected in series at each breakpoint, so that the radiator 100 can form a multi-frequency circularly polarized antenna. The principle is the same as described above and will not be repeated here.

[0096] In another embodiment of the present application, the circularly polarized antenna further includes a third filter; in this case, the first filter only allows the second communication frequency band signal and the third communication frequency band signal to pass through; the second filter only allows the first communication frequency band signal and the third communication frequency band signal to pass through; the third filter only allows the first communication frequency band signal and the second communication frequency band signal to pass through. The first communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feed terminal 200, the radiator 100 and the first inductor L1; or, the first communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feed terminal 200, the radiator 100 and the first capacitor C1. The second communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feed terminal 200, the radiator 100 and the second inductor L2; or, the second communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feed terminal 200, the radiator 100 and the second capacitor C2. The third communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the third inductor L3; or, the third communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal 200, the radiator 100 and the third capacitor C3.

[0097] It can be seen from this that the first communication frequency band signal, the second communication frequency band signal and the third communication frequency band signal do not interfere with each other. By adjusting the capacitance value of the first capacitor C1 or the inductance value of the first inductor L1 at the first breakpoint 300, and / or adjusting the capacitance value of the second capacitor C2 or the inductance value of the second inductor L2 at the second breakpoint 500, and / or adjusting the capacitance value of the third capacitor or the inductance value of the third inductor at the third breakpoint, the circular polarization characteristics of the first communication frequency band signal, the second communication frequency band signal and the third communication frequency band signal can be adjusted, and ultimately the radiator 100 forms a three-band circularly polarized antenna.

[0098] Exemplarily, the third filter is connected in parallel with the third capacitor, or the third filter is connected in parallel with the third inductor.

[0099] In addition, a triple-band circularly polarized antenna can be realized by connecting a plurality of filters in series and in parallel at each of the three breakpoints of the radiator, and the plurality of filters allow signals of a plurality of frequency bands to pass through.

[0100] Similarly, more than three breakpoints can be set on the radiator 100, and a capacitor or inductor can be connected in series at each breakpoint, and at least one filter can be connected in series at each breakpoint, so that the radiator 100 can form a multi-frequency circularly polarized antenna. The principle is the same as described above and will not be repeated here.

[0101] As shown in FIG. 12 , the circularly polarized antenna further includes a second feeding terminal 600 , one end of which is electrically connected to the radiator 100 , and the other end of which is electrically connected to the second feeding module on the mainboard 400 .

[0102] Specifically, when a first breakpoint 300 and a second breakpoint 500 are opened on the radiator 100, a first capacitor C1 or a first inductor L1 is connected in series at the first breakpoint 300, a second capacitor C2 or a second inductor L2 is connected in series at the second breakpoint 500, and the first filter RC1 is connected in parallel with the first capacitor C1 or the first inductor L1, the radiator 100 forms a dual-frequency circularly polarized antenna.

[0103] When the circularly polarized antenna includes a first feed terminal 200 and a second feed terminal 600, the first feed module on the mainboard 400 connected to the first feed terminal 200 can be a GPS module. In this case, the first feed module is used to receive GPS signals in a single frequency band. The second feed module on the mainboard 400 connected to the second feed terminal 600 can be a Bluetooth module or a WiFi module. In this case, the second feed module is used to receive Bluetooth or WiFi signals. Therefore, the circularly polarized antenna can simultaneously excite and receive single-frequency GPS signals and Bluetooth or WiFi signals.

[0104] The method for determining the position of the connection point between the second feeding terminal 600 and the radiator 100 is the same as the method for determining the position of the first feeding terminal 200 , and will not be repeated here.

[0105] As shown in FIG13 , when a first breakpoint 300 and a second breakpoint 500 are provided on the radiator 100, a first capacitor C1 or a first inductor L1 is connected in series at the first breakpoint 300, a second capacitor C2 or a second inductor L2 is connected in series at the second breakpoint 500, a first filter RC1 is connected in parallel with the first capacitor C1 or the first inductor L1, and a second filter RC2 is connected in parallel with the second capacitor C2 or the second inductor L2, the radiator 100 forms a dual-frequency circularly polarized antenna. Because the frequencies of the signals that the antenna can excite or receive are in a multiple-frequency relationship, for example, the antenna can excite or receive signals in the f0 band, signals in the 2 f0 band, and signals in the 3 f0 band. Specifically, the frequency of GPS signals in the L5 band is approximately 1.176 GHz, and the frequency of Bluetooth signals or WiFi signals is 2.4 GHz. The frequency of Bluetooth signals or WiFi signals is approximately twice the frequency of GPS signals in the L5 band. Therefore, while the circularly polarized antenna can excite or receive GPS signals in the L5 band, it can also simultaneously receive Bluetooth signals or WiFi signals.

[0106] When the circularly polarized antenna includes a first feed terminal 200 and a second feed terminal 600, the first feed module on the mainboard 400 connected to the first feed terminal 200 can be a GPS module. In this case, the first feed module is used to receive GPS signals. The second feed module on the mainboard 400 connected to the second feed terminal 600 can be a Bluetooth module or a WiFi module. In this case, the second feed module is used to receive Bluetooth or WiFi signals. Therefore, the circularly polarized antenna can simultaneously excite and receive dual-frequency GPS signals and Bluetooth or WiFi signals.

[0107] The method for determining the position of the connection point between the second feeding terminal 600 and the radiator 100 is the same as the method for determining the position of the first feeding terminal 200 , and will not be repeated here.

[0108] The present application also discloses a smart terminal, including the circularly polarized antenna described above. Since the circularly polarized antenna only uses one annular radiator, the space occupied by the antenna is reduced. Therefore, the smart terminal is more conducive to achieving a miniaturized design.

[0109] The smart terminal of the present application can be a mobile phone, a tablet computer and a smart wearable device, and the smart wearable device can be a smart watch, a smart bracelet, a smart headset or smart glasses, etc.

[0110] The above-described 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. 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 various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A circularly polarized antenna, characterized in that: include: A ring-shaped radiator, wherein a first breakpoint is formed on the radiator, and a first capacitor or a first inductor is connected in series to the first breakpoint; as well as A first feeding terminal has one end electrically connected to the radiator and the other end electrically connected to the first feeding module of the mainboard.

2. The circularly polarized antenna according to claim 1, wherein A line connecting the first feeding terminal and the center point of the radiator is a first line, a line connecting the first breakpoint and the center point of the radiator is a second line, a counterclockwise direction of the radiator is a first direction, and along the first direction, a first angle α is formed between the first line and the second line; Among them, α∈(0, π / 2) ∪ (π, 3π / 2); or, α∈ (π / 2, π) ∪ (3π / 2, 2π).

3. The circularly polarized antenna according to claim 2, wherein: α∈(0,π / 3)∪(π,4π / 3); or, α∈(2π / 3,π)∪(5π / 3,2π).

4. The circularly polarized antenna according to claim 2, wherein: The radiator is further provided with a second breakpoint, and a second capacitor or a second inductor is connected in series to the second breakpoint.

5. The circularly polarized antenna according to claim 4, wherein: A line connecting the first feeding terminal and the center point of the radiator is a first line, a line connecting the second breakpoint and the center point of the radiator is a third line, a counterclockwise direction of the radiator is a first direction, and along the first direction, a second angle β is formed between the first line and the third line; Among them, β∈(0, π / 2) ∪ (π, 3π / 2); or, β∈ (π / 2, π) ∪ (3π / 2, 2π).

6. The circularly polarized antenna according to claim 5, characterized in that: β∈(0,π / 3)∪(π,4π / 3); or, β∈(2π / 3,π)∪(5π / 3,2π).

7. The circularly polarized antenna according to any one of claims 4 to 6, wherein: The circularly polarized antenna also includes a first filter, which is used to filter signals of other communication frequency bands except the second communication frequency band signal. The second communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feed terminal, the radiator and the second capacitor, or the second communication frequency band signal is a signal of the working frequency band of the circularly polarized antenna formed by the first feed terminal, the radiator and the second inductor.

8. The circularly polarized antenna according to claim 7, wherein: The first filter is connected in parallel with the first capacitor, or the first filter is connected in parallel with the first inductor.

9. The circularly polarized antenna according to claim 7, wherein: The circularly polarized antenna also includes a second filter, which is used to filter signals of other communication frequency bands except the first communication frequency band signal. The signal of the first communication frequency band is the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal, the radiator and the first capacitor, or the signal of the first communication frequency band is the signal of the working frequency band of the circularly polarized antenna formed by the first feeding terminal, the radiator and the first inductor.

10. The circularly polarized antenna according to claim 9, wherein: The second filter is connected in parallel with the second capacitor, or the second filter is connected in parallel with the first inductor.

11. The circularly polarized antenna according to claim 7, wherein: The circularly polarized antenna further includes a second feeding terminal, one end of the second feeding terminal is electrically connected to the radiator, and the other end of the second feeding terminal is electrically connected to a second feeding module on the mainboard.

12. The circularly polarized antenna according to claim 9, wherein: The circularly polarized antenna further includes a second feeding terminal, one end of the second feeding terminal is electrically connected to the radiator, and the other end of the second feeding terminal is electrically connected to a second feeding module on the mainboard.

13. An intelligent terminal, characterized in that: The circularly polarized antenna comprises the circularly polarized antenna according to any one of claims 1 to 12.

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