CN212011256U - Circularly polarized positioning antenna and wearable equipment - Google Patents
Circularly polarized positioning antenna and wearable equipment Download PDFInfo
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- CN212011256U CN212011256U CN202020943049.1U CN202020943049U CN212011256U CN 212011256 U CN212011256 U CN 212011256U CN 202020943049 U CN202020943049 U CN 202020943049U CN 212011256 U CN212011256 U CN 212011256U
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Abstract
A circularly polarized positioning antenna and a wearable device, the circularly polarized positioning antenna comprising: the first annular radiator works in a first frequency band; the first branch of the legal person is connected with the first annular radiator in a coupling mode, and the first branch is used for accessing a first feed signal so as to excite the first annular radiator to work in a first radiation mode; with the second minor matters of the coupling connection of the first annular irradiator, and with first minor matters has the distance of predetermineeing, the second minor matters is used for ground connection or is used for inserting the second feed signal, and two radiation patterns have the phase difference of same amplitude and 90 degrees, and annular irradiator produces dextrorotation circular polarization radiation promptly to make positioning antenna can receive navigation satellite signal better, the produced dextrorotation circular polarization radiation of annular irradiator can also filter the levogyration circular polarization navigation satellite signal through high building or ground reflection simultaneously, in order to reduce multipath interference, thereby effectively improve wearable equipment's positioning antenna's positioning accuracy.
Description
Technical Field
The application belongs to the technical field of antennas, and particularly relates to a circularly polarized positioning antenna and wearable equipment.
Background
In intelligent wrist-watch or bracelet field, positioning accuracy is the pain point that people were concerned about always. Traditional smart watch or bracelet positioning antenna are mostly linear polarization antenna, but the signal that the navigation satellite sent is dextrorotation circular polarization signal behind the ionosphere, therefore the unable whole signals of receiving the navigation satellite of positioning antenna of smart watch or bracelet, and the signal of navigation satellite is by after ground, high building, trees etc. odd number reflection again, can become levogyration circular polarization signal, the multipath interference that will produce seriously influences the location effect of complete machine.
SUMMERY OF THE UTILITY MODEL
An object of the application is to provide a circular polarization positioning antenna and wearable equipment, aim at solving the lower technical problem of antenna positioning accuracy of current wearable equipment.
A first aspect of an embodiment of the present application provides a circularly polarized positioning antenna, including:
the first annular radiator works in a first frequency band;
the first branch node is coupled with the first annular radiator, and one end of the first branch node, which is far away from the first annular radiator, is used for accessing a first feed signal so as to excite the first annular radiator to work in a first radiation mode;
the second branch node is coupled with the first annular radiator and has a preset distance with the first branch node, one end, far away from the first annular radiator, of the second branch node is used for grounding or is used for accessing a second feed signal so as to excite the first annular radiator to work in a second radiation mode, and the phase difference between the first feed signal and the second feed signal is 90 degrees.
The circularly polarized positioning antenna carries out coupling feeding through one branch, and the other branch is also coupled feeding or grounding, so that two radiation modes of the first annular radiator are excited, the two radiation modes have the same amplitude and the phase difference of 90 degrees, namely the first annular radiator generates right-hand circularly polarized radiation, so that the positioning antenna can better receive navigation satellite signals, and meanwhile, the right-hand circularly polarized radiation generated by the first annular radiator can also filter left-hand circularly polarized navigation satellite signals reflected by a high-rise building or the ground, so that multipath interference is reduced, and the positioning precision of the positioning antenna of the wearable device is effectively improved.
In one embodiment, the antenna further includes a second annular radiator coupled to the first annular radiator 10, where the second annular radiator operates in a second frequency band, and one of the first annular radiator and the second annular radiator is disposed on an outer periphery of the other and isolated from the other.
Two radiation modes of the second annular radiator are realized by mutually coupling the two annular radiators, the two radiation modes have equal amplitude and 90-degree phase difference, and the circular polarization effect is also achieved; the two annular radiators act together to realize double-frequency circular polarization.
In one embodiment, the center of the first annular radiator and the center of the second annular radiator are located on the same axis.
In one embodiment, a circumference of the first annular radiator corresponds to a wavelength of the first frequency band.
In one embodiment, a circumference of the second annular radiator corresponds to a wavelength of the second frequency band.
In one embodiment, a plurality of first inductive devices are arranged on the first annular radiator, and the inductive devices are arranged at intervals along the circumferential direction of the first annular radiator; and/or
The second annular radiator is provided with a plurality of second inductance devices, and the second inductance devices are arranged at intervals along the circumferential direction of the second annular radiator.
In one embodiment, the first inductive device and the second inductive device are lumped inductors or distributed inductors.
In one embodiment, each of the first branch and the second branch includes a first coupling segment and a second coupling segment, a long side of the first coupling segment is opposite to an edge of the first annular radiator, and a coupling gap is disposed between the long side of the first coupling segment and the edge of the first annular radiator, a first end of the second coupling segment is connected to the first coupling segment, and a second end of the second coupling segment extends in a direction away from the first coupling segment and serves as the end away from the first annular radiator.
The coupling degree can be adjusted by adjusting the sizes of the branches and the distance between the coupling gaps, and the matching tuning of the antenna is realized.
In one embodiment, the plane of the first branch, the plane of the second branch and the plane of the first annular radiator are perpendicular to each other, or
The projections of the first branch knot and the second branch knot in the direction perpendicular to the plane where the first annular radiator is located fall outside the range of the plane.
In one embodiment, the main bodies of the first and second branches are T-shaped structures or inverted L-shaped structures.
In one embodiment, each of the first branch and the second branch includes a capacitor and a first coupling segment, one end of the capacitor is connected to the first annular radiator, the other end of the capacitor is connected to the first end of the first coupling segment, and the second end of the first coupling segment is used as the end far away from the first annular radiator. This example provides another implementation of the stub.
In one embodiment, the first and second annular radiators are square ring structures, rounded square ring structures, rectangular ring structures, rounded rectangular ring structures, elliptical ring structures, or circular ring structures.
In one embodiment, the preset distance between the first branch and the second branch along the periphery of the first annular radiator is 0.125-0.375 times of the wavelength of the first frequency band.
A second aspect of the embodiments of the present application provides a wearable device, including a circuit board and the circular polarization positioning antenna as described above, a first branch of the circular polarization positioning antenna is connected to a first radio frequency port of the circuit board, and a second branch of the circular polarization positioning antenna is connected to a second radio frequency port of the circuit board or a ground port of the circuit board.
The wearable device adopts all the embodiments of the circularly polarized positioning antenna, so that at least all the beneficial effects of the embodiments are achieved, and the details are not repeated herein.
Drawings
Fig. 1 is a schematic structural diagram of a single-feed single-frequency circularly polarized positioning antenna according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dual-fed single-frequency circularly polarized positioning antenna according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dual-fed single-frequency circularly polarized positioning antenna provided by the second embodiment of the present invention;
fig. 4 is an S parameter schematic diagram of the dual-fed single-frequency circularly polarized positioning antenna provided in the embodiment of the present invention;
fig. 5 is a top two-dimensional axial ratio simulation diagram of the dual-fed single-frequency circularly polarized positioning antenna provided in the embodiment of the present invention;
fig. 6 is a two-dimensional four-axis ratio simulation diagram of a section of a double-fed single-frequency circularly polarized positioning antenna provided by the embodiment of the present invention, where phi is 0 °, 45 °, 90 °, and 135 °;
fig. 7 is a schematic diagram of a two-dimensional right-hand circular polarization gain of the dual-fed single-frequency circular polarization positioning antenna provided by the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a single-feed dual-band circularly polarized positioning antenna according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a dual-feed dual-band circularly polarized positioning antenna provided in an embodiment of the present invention;
fig. 10 is a schematic diagram of an S parameter of a single-feed dual-band circularly polarized positioning antenna according to an embodiment of the present invention;
fig. 11 is a top two-dimensional axial ratio simulation diagram of the second annular radiator of the single-feed dual-band circularly polarized positioning antenna provided in the embodiment of the present invention during operation;
fig. 12 is a top two-dimensional axial ratio simulation diagram of the single-feed dual-band circularly polarized positioning antenna according to the embodiment of the present invention when the first annular radiator operates;
fig. 13 is a schematic diagram of a top two-dimensional right-hand circular polarization gain of the single-feed dual-band circular polarization positioning antenna when the second annular radiator operates according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a top two-dimensional right-hand circular polarization gain when the first annular radiator works in the single-feed dual-band circular polarization positioning antenna provided by the embodiment of the present invention;
fig. 15 is a two-dimensional four-axis ratio simulation diagram of a section of 0 ° and 90 ° when the second annular radiator of the single-feed dual-band circularly polarized positioning antenna provided in the embodiment of the present invention operates;
fig. 16 is a two-dimensional four-axis ratio simulation diagram of a section of 0 ° and 90 ° when phi of the first annular radiator works in the single-feed dual-band circularly polarized positioning antenna provided in the embodiment of the present invention;
fig. 17 is a schematic diagram of a right-hand circular polarization gain of the second annular radiator of the single-feed dual-band circular polarization positioning antenna according to the embodiment of the present invention when operating;
fig. 18 is a schematic diagram of right-hand circular polarization gain when the first annular radiator works in the single-feed dual-band circular polarization positioning antenna provided by the embodiment of the present invention;
fig. 19 is a schematic diagram of an S parameter of a dual-feed dual-band circularly polarized positioning antenna provided in an embodiment of the present invention;
fig. 20 is a top two-dimensional axial ratio simulation diagram of the double-fed dual-band circularly polarized positioning antenna according to the embodiment of the present invention when the second annular radiator operates;
fig. 21 is a top two-dimensional axial ratio simulation diagram of the dual-fed dual-band circularly polarized positioning antenna according to the embodiment of the present invention when the first annular radiator operates;
fig. 22 is a two-dimensional four-axis ratio simulation diagram of a section of 0 °, 45 °, 90 °, and 135 ° when a second annular radiator of the dual-feed dual-band circularly polarized positioning antenna provided in the embodiment of the present invention operates;
fig. 23 is a two-dimensional four-axis ratio simulation diagram of a section of 0 °, 45 °, 90 °, and 135 ° when phi of the first annular radiator in the double-fed dual-band circularly polarized positioning antenna provided in the embodiment of the present invention works;
fig. 24 is a schematic diagram of two-dimensional right-hand circular polarization gain of the double-fed dual-band circular polarization positioning antenna according to the embodiment of the present invention when the second annular radiator operates;
fig. 25 is a schematic diagram of two-dimensional right-hand circular polarization gain of the dual-fed dual-band circular polarization positioning antenna according to the embodiment of the present invention when the first annular radiator operates.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 and fig. 2, a circular polarization positioning antenna for a wearable device according to an embodiment of the present application includes: a first annular radiator 10, a first branch 20 and a second branch 30.
The first annular radiator 10 operates in a first frequency band, such as 1.575GHz or 1.176 GHz. Optionally, the main body of the first annular radiator 10 is a central symmetric structure or an axial symmetric structure, such as a circular ring structure, a square ring structure, a rounded square ring structure, a rectangular ring structure, a rounded rectangular ring structure, an elliptical ring structure, and the like, so as to ensure that excitations of two modes with equal amplitude and 90 ° phase difference are generated on the antenna, and implement the circular polarization characteristic of the antenna.
The first branch 20 is coupled to the first annular radiator 10, and one end of the first branch 20, which is away from the first annular radiator 10, is used to access a first feed signal, so as to excite the first annular radiator 10 to operate in a first radiation mode; the second branch 30 is coupled to the first annular radiator 10 and has a predetermined distance from the first branch 20.
Referring to fig. 1, in one embodiment, an end of the second branch 30 away from the first annular radiator 10 is used as a ground 100 to excite the first annular radiator 10 to operate in the second radiation mode. Referring to fig. 2, in another embodiment, an end of the second branch 30 away from the first annular radiator 10 is used to connect a second feeding signal, so as to excite the first annular radiator 10 to operate in the second radiation mode, and the phase difference between the first feeding signal and the second feeding signal of the ac signal is 90 °. The two embodiments have similar performances and can be selected according to requirements when applied.
The circularly polarized positioning antenna and the wearable device perform coupling feeding through one branch, and the other branch is also coupled with feeding or grounding 100, so that two radiation modes of the first annular radiator 10 are excited, the two radiation modes have the same amplitude and the phase difference of 90 degrees, that is, the first annular radiator 10 generates right-hand circularly polarized radiation, so that the positioning antenna can better receive navigation satellite signals, and meanwhile, the right-hand circularly polarized radiation generated by the first annular radiator 10 can also filter left-hand circularly polarized navigation satellite signals reflected by a tall building or the ground, so as to reduce multipath interference, and thus effectively improve the positioning accuracy of the positioning antenna of the wearable device.
In one embodiment, the circumference of the first annular radiator 10 corresponds to the wavelength of the first frequency band, for example, the circumference of the first annular radiator 10 is substantially equal to the wavelength of the first frequency band, or the circumference of the first annular radiator 10 is substantially equal to 1/4 wavelength of the first frequency band, so as to ensure that the antenna resonates at a desired frequency point.
In one embodiment, the predetermined distance between the first branch 20 and the second branch 30 along the circumference of the first annular radiator 10 is 0.1 to 0.5 times, and typically 0.125 to 0.375 times, the wavelength of the first frequency band. It should be noted that, when the first annular radiator 10 is a square structure, a rounded square structure, a rectangular structure, or a rounded rectangular structure, two branches are respectively coupled to two adjacent sides of the first annular radiator 10, as in the solutions provided in the embodiments of fig. 1 and 2, the first branch 20 and the second branch 30 are respectively disposed at the midpoint positions of the two adjacent sides of the square first annular radiator 10, so that the antenna is better and has a good circular polarization effect.
In one embodiment, the gap coupling feed is arranged between the branch and the radiator, so that matching and tuning are easier. Specifically, the first branch 20 and/or the second branch 30 includes a first coupling segment and a second coupling segment, a long side of the first coupling segment is opposite to an edge of the first annular radiator 10, and a coupling gap is disposed between the long side and the edge of the first annular radiator 10, a first end of the second coupling segment is connected to the first coupling segment, and a second end of the second coupling segment extends in a direction away from the first coupling segment and serves as an end away from the first annular radiator 10. Therefore, the main body of the branch knot forms a T-shaped structure or an inverted L-shaped structure, and the coupling degree can be adjusted by adjusting the size of the branch knot and the distance of the coupling gap, so that the matching tuning of the antenna is realized.
In some embodiments, the plane of the first branch 20 and the plane of the second branch 30 are perpendicular to the plane of the first annular radiator 10; in other embodiments, projections of the first branch 20 and the second branch 30 in a direction perpendicular to a plane of the first annular radiator 10 fall outside the range of the plane, and an included angle formed by the plane of the first branch 20 and the plane of the second branch 30 and the plane of the first annular radiator 10 is ± 90 °.
In other embodiments, the branch and the radiator are directly fed, the first branch 20 and/or the second branch 30 each include a capacitor and a third coupling segment, one end of the capacitor is connected to the first annular radiator 10, the other end of the capacitor is connected to a first end of the third coupling segment, and a second end of the third coupling segment is used as an end far away from the first annular radiator 10. Therefore, another implementation mode of the branch and the coupling is provided, the coupling degree can be adjusted by selecting the capacitors with different capacitance, and the matching tuning of the antenna is realized. It is understood that, in the two coupling manners, the first branch 20 and the second branch 30 may be selected from the same coupling manner or different coupling manners.
Referring to fig. 3, in a further embodiment, in order to achieve miniaturization, a plurality of first inductor devices 40 are disposed on the first annular radiator 10, and the first inductor devices 40 are spaced apart from each other along the circumference of the first annular radiator 10. Optionally, the first inductance devices 40 are arranged at equal intervals in the circumferential direction of the first annular radiator 10, and certainly, may not be arranged at equal intervals, and may be specifically adjusted according to actual needs. In this embodiment, the first inductor device 40 is mainly configured to extend the physical length of the first annular radiator 10, so as to reduce the size of the positioning antenna and effectively realize miniaturization of the antenna. Alternatively, the first inductive device 40 may generally be a lumped inductance, i.e. an inductor, but also a serpentine meandering track.
As shown in fig. 3, in this embodiment, four first inductive devices 40 are disposed on the first annular radiator 10, but the present invention is not limited thereto, and a different number of first inductive devices 40 may be disposed according to different size requirements. In general, in order to achieve a good circular polarization effect, the first inductor devices 40 are equally spaced in the circumferential direction of the first annular radiator 10, and the first inductor devices 40 are disposed at positions where the current is maximum, such as the middle points of the sides of the square frame-shaped first annular radiator 10. The inductance value range of the first inductance device 40 can be flexibly selected according to a specific working frequency band and a limited size, and the larger the inductance is, the smaller the volume of the annular radiator can be. In some cases where miniaturization is required, most or all of each side of the loop radiator may be formed by distributed inductance, that is, most or all of each side is a serpentine trace, or a plurality of inductors are loaded.
As can be seen from fig. 4, the circularly polarized Positioning antenna generates resonance at 1.575GHz of the GPS (Global Positioning System) L1 frequency band, and the impedance bandwidth (S11 < -6dB) can completely cover the whole GPS-L1 frequency band (1575 ± 2MHz), indicating that the Positioning antenna has good reception of navigation satellite signals.
As can be seen from fig. 5 and 6, when the positioning antenna operates in the L1 frequency band of the GPS, the axial ratio of the top (phi is 0 ° and theta is 0 °) of the positioning antenna is less than 5dB, and when the positioning antenna operates in the GPS-L1 frequency band of 1.575GHz and the section is phi is 0 °, 45 °, 90 °, and 135 °, the axial ratio of the positioning antenna is less than 10dB in the range of-60 ° to 60 °, which indicates that the axial ratio of the positioning antenna is good and meets the performance requirement of the positioning antenna.
As can be seen from fig. 7, when the positioning antenna operates in the GPS-L1 frequency band 1.575GHz, the right-handed circularly polarized gain at the top of the positioning antenna (phi is 0 °, theta is 0 °) is about 2.1dB, and under the condition of the same gain, the circularly polarized antenna improves the signal received by the conventional linearly polarized antenna by 3dB, so that the positioning effect of the positioning antenna is better than that of the conventional linearly polarized antenna.
Referring to fig. 8, the circular polarization positioning antenna provided in the embodiment of the present application can also implement dual-band circular polarization. In this embodiment, the circular polarization positioning antenna further includes a second annular radiator 50 coupled to the first annular radiator 10, the second annular radiator 50 operates in the second frequency band, and one of the first annular radiator 10 and the second annular radiator 50 is disposed at an outer periphery of the other and isolated from the other. It is understood that the first and second annular radiators 10 and 50 are sized according to different frequency bands in which they operate. For example, if the first annular radiator 10 operates at 1.575GHz and the second annular radiator 50 operates at 1.176GHz, the first annular radiator 10 will be at the outer periphery of the second annular radiator 50.
Two radiation modes of the second annular radiator 50 are realized by mutual coupling of the two annular radiators, the two radiation modes have equal amplitude and 90-degree phase difference, the circular polarization effect is also achieved, and the two annular radiators act together to realize double-frequency circular polarization. When the first annular radiator 10 is required to work, the feed signal matched with the working frequency is accessed, and when the second annular radiator 50 is required to work, the feed signal matched with the working frequency is accessed.
Generally, the first annular radiator 10 and the second annular radiator 50 have the same shape, and different shapes may be set according to requirements, and the second annular radiator 50 is similar to the first annular radiator 10 and has a central symmetric structure or an axial symmetric structure, such as a circular ring structure, a square ring structure, a rounded square ring structure, a rectangular ring structure, a rounded rectangular ring structure, an elliptical ring structure, and the like, so that excitation in two modes with equal amplitude and 90-degree phase difference is generated on the antenna, and the circular polarization characteristic of the antenna is realized.
In one embodiment, to achieve a good circular polarization effect, the center of the first annular radiator 10 and the center of the second annular radiator 50 are located on the same axis, so that the coupling degrees in all directions are balanced.
In one embodiment, the circumference of the second annular radiator 50 corresponds to the wavelength of the second frequency band. For example, the circumference of the second annular radiator 50 is substantially equal to the wavelength of the second frequency band, or the circumference of the second annular radiator 50 is substantially equal to 1/4 wavelength of the second frequency band, so as to ensure that the antenna resonates at the required frequency point.
Referring to fig. 9, in one embodiment, to achieve miniaturization, a plurality of second inductor devices 60 are disposed on the second annular radiator 50, and the second inductor devices 60 are spaced apart along the circumferential direction of the second annular radiator 50. Optionally, the second inductance devices 60 are arranged at equal intervals in the circumferential direction of the second annular radiator 50, which of course may not be arranged at equal intervals, and may be specifically adjusted according to actual needs. In the present embodiment, the second inductor 60 is mainly configured to extend the physical length of the second annular radiator 50, so as to reduce the size of the positioning antenna, and effectively implement miniaturization of the antenna. Alternatively, the second inductive device 60 may generally be a lumped inductance, i.e., an inductor, or may be a serpentine trace.
As shown in fig. 9, in this embodiment, four second inductive devices 60 are disposed on the second annular radiator 50, but the present invention is not limited thereto, and a different number of second inductive devices 60 may be disposed according to different size requirements. In general, in order to achieve a good circular polarization effect, the second inductive devices 60 are equally spaced around the second annular radiator 50, and the second inductive devices 60 are disposed at the positions where the current is the largest, such as the middle points of the sides of the square frame shaped second annular radiator 50. The inductance value range of the second inductance device 60 can be flexibly selected according to the specific working frequency band and the limited size, and the larger the inductance is, the smaller the volume of the annular radiator can be. In some cases where miniaturization is required, most or all of each side of the loop radiator may be formed by distributed inductance, that is, most or all of each side is a serpentine trace, or a plurality of inductors are loaded.
A coupling gap is formed between the first annular radiator 10 and the second annular radiator 50, and the coupling degree can be adjusted by adjusting the distance between the coupling gaps, so that the matching tuning of the antenna is realized.
As can be seen from FIG. 10, the single-feed dual-band circularly polarized positioning antenna shown in FIG. 8 generates a resonance at the GPS-L1 frequency band of 1.575GHz and another resonance at the GPS-L5 frequency band of 1.176GHz, and the impedance bandwidth (S11 < -6dB) can completely cover the whole GPS-L1 frequency band (1575 +/-2 MHz) and the GPS-L5 frequency band (1176 +/-2 MHz), which indicates that the signal reception for the navigation satellite is good.
As can be seen from fig. 11, 13, 15, and 17, when the positioning antenna shown in fig. 8 operates in the L5 frequency band 1.176GHz of the GPS, the axial ratio of the top portion (phi is 0 °, theta is 0 °) of the positioning antenna is less than 1dB, the right-hand circularly polarized gain of the top portion is about 1.9dB, and when the positioning antenna operates in the L5 frequency band 1.176GHz of the GPS and the section is phi is 0 °, 90 °, the axial ratio of the positioning antenna is less than 10dB in the range of-60 to 75 °, which indicates that the axial ratio characteristic of the positioning antenna is good and the performance requirement of the positioning antenna is met.
As can be seen from fig. 12, 14, 16, and 18, when the positioning antenna shown in fig. 8 operates in the L1 frequency band 1.575GHz of the GPS, the axial ratio of the top portion (phi ═ 0 °, theta ═ 0 °) of the positioning antenna is less than 3dB, the right-hand circular polarization gain of the top portion is about 2.8dB, and when the positioning antenna operates in the L1 frequency band 1.575GHz of the GPS and the section is phi ═ 0 °, 90 °, the axial ratio of the positioning antenna is less than 10dB in the range of-75 ° to 50 °, which indicates that the axial ratio characteristic of the positioning antenna is good and the performance requirement of the positioning antenna is met. Under the condition of the same gain, the circularly polarized antenna is improved by 3dB compared with the traditional linearly polarized antenna for receiving satellite signals, and the positioning effect of the positioning antenna is better than that of the traditional linearly polarized antenna.
As can be seen from FIG. 19, the dual-feed dual-band circularly polarized positioning antenna shown in FIG. 9 generates a resonance at the GPS-L1 frequency band of 1.575GHz and another resonance at the GPS-L5 frequency band of 1.176GHz, and the impedance bandwidth (S11 < -6dB) can completely cover the whole GPS-L1 frequency band (1575 +/-2 MHz) and the GPS-L5 frequency band (1176 +/-2 MHz), which indicates that the navigation satellite signals are well received.
As can be seen from fig. 20, 22, and 24, when the positioning antenna shown in fig. 9 operates in the L5 frequency band 1.176GHz of the GPS, the axial ratio of the top of the positioning antenna (phi is 0 °, theta is 0 °) is less than 5.6dB, and when the positioning antenna operates in the L5 frequency band 1.176GHz of the GPS and the section is phi is 0 °, 45 °, 90 °, and 135 °, the axial ratio of the positioning antenna is less than 10dB in the range of-60 to 60 °, which indicates that the axial ratio characteristic of the positioning antenna is good and meets the performance requirement of the positioning antenna. When the positioning antenna shown in fig. 9 operates in the L5 frequency band 1.176GHz of the GPS, the right-hand circularly polarized gain at the top of the positioning antenna (phi is 0 ° and theta is 0 °) is about 2.4dB, and under the condition of the same gain, the circularly polarized antenna improves the satellite signal reception by 3dB compared with the conventional linearly polarized antenna, and the positioning effect of the positioning antenna is better than that of the conventional linearly polarized antenna.
As can be seen from fig. 21, 23, and 25, when the positioning antenna shown in fig. 9 operates in the L1 frequency band 1.575GHz of the GPS, the axial ratio of the top of the positioning antenna (phi is 0 °, theta is 0 °) is less than 4.5dB, and when the positioning antenna operates in the L1 frequency band 1.575GHz of the GPS and the section is phi is 0 °, 45 °, 90 °, and 135 °, the axial ratio of the positioning antenna is less than 10dB in the range of-55 to 60 °, which indicates that the axial ratio characteristic of the positioning antenna is good and meets the performance requirement of the positioning antenna. When the positioning antenna shown in fig. 9 operates in the L1 frequency band 1.176GHz of the GPS, the right-hand circularly polarized gain at the top of the positioning antenna (phi is 0 ° and theta is 0 °) is about 0.9dB, and under the condition of the same gain, the circularly polarized antenna improves the satellite signal reception by 3dB compared with the conventional linearly polarized antenna, and the positioning effect of the positioning antenna is better than that of the conventional linearly polarized antenna.
In addition, the present application further provides a wearable device, which includes a circuit board and the circular polarization positioning antenna according to any of the above embodiments, wherein an end of the first branch of the circular polarization positioning antenna, which is far away from the first annular radiator, is connected to the first radio frequency port of the circuit board, and an end of the second branch of the circular polarization positioning antenna, which is far away from the first annular radiator, is connected to the second radio frequency port of the circuit board or the ground port of the circuit board.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (14)
1. A circularly polarized positioning antenna, comprising:
the first annular radiator works in a first frequency band;
the first branch node is coupled with the first annular radiator, and one end of the first branch node, which is far away from the first annular radiator, is used for accessing a first feed signal so as to excite the first annular radiator to work in a first radiation mode;
the second branch knot is connected with the first annular radiator in a coupling mode and has a preset distance with the first branch knot, one end, far away from the first annular radiator, of the second branch knot is used for grounding or is used for accessing a second feed signal so as to excite the first annular radiator to work in a second radiation mode, and the phase difference between the first feed signal and the second feed signal is 90 degrees.
2. The circularly polarized positioning antenna of claim 1, further comprising a second annular radiator coupled to the first annular radiator, wherein the second annular radiator operates in a second frequency band, and wherein one of the first annular radiator and the second annular radiator is disposed at an outer periphery of the other and isolated from the other.
3. The circularly polarized positioning antenna of claim 2, wherein the center of the first annular radiator and the center of the second annular radiator lie on the same axis.
4. The circularly polarized positioning antenna of claim 1, wherein the first annular radiator has a perimeter corresponding to a wavelength of the first frequency band.
5. The circularly polarized positioning antenna of claim 2, wherein the perimeter of the second loop radiator corresponds to the wavelength of the second band.
6. The circularly polarized positioning antenna of claim 2, wherein the first annular radiator has a plurality of first inductive devices disposed thereon, and the inductive devices are circumferentially spaced along the first annular radiator; and/or
The second annular radiator is provided with a plurality of second inductance devices, and the second inductance devices are arranged at intervals along the circumferential direction of the second annular radiator.
7. The circularly polarized positioning antenna of claim 6, wherein the first inductive device and the second inductive device are lumped inductors or distributed inductors.
8. The circular polarization positioning antenna of claim 1, wherein the first branch and/or the second branch each include a first coupling segment and a second coupling segment, a long side of the first coupling segment is directly opposite to an edge of the first annular radiator, and a coupling gap is disposed therebetween, a first end of the second coupling segment is connected to the first coupling segment, and a second end of the second coupling segment extends in a direction away from the first coupling segment and serves as the end away from the first annular radiator.
9. The circularly polarized positioning antenna of claim 8, wherein the plane of the first branch, the plane of the second branch and the plane of the first annular radiator are perpendicular to each other, or
The projections of the first branch knot and the second branch knot in the direction perpendicular to the plane where the first annular radiator is located fall outside the range of the plane.
10. The circularly polarized positioning antenna of claim 8, wherein the main bodies of the first and second branches are T-shaped or inverted-L-shaped.
11. The circularly polarized positioning antenna of claim 1, wherein the first branch and/or the second branch each comprise a capacitor and a first coupling section, one end of the capacitor is connected to the first annular radiator, the other end of the capacitor is connected to the first end of the first coupling section, and the second end of the first coupling section is the end away from the first annular radiator.
12. A circularly polarized positioning antenna according to claim 2, 3, 5, 6 or 7, wherein: the first annular radiator and the second annular radiator are of a square annular structure, a fillet square annular structure, a rectangular annular structure, a fillet rectangular annular structure, an elliptical annular structure or a circular annular structure.
13. The circularly polarized positioning antenna of any of claims 1 to 11, wherein: the preset distance between the first branch and the second branch along the periphery of the first annular radiator is 0.125-0.375 times of the wavelength of the first frequency band.
14. A wearable device, characterized by: the circular polarization positioning antenna of any one of claims 1 to 13, comprising a circuit board, wherein an end of the first branch of the circular polarization positioning antenna away from the first annular radiator is connected to the first rf port of the circuit board, and an end of the second branch of the circular polarization positioning antenna away from the first annular radiator is connected to the second rf port of the circuit board or the ground port of the circuit board.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021238200A1 (en) * | 2020-05-28 | 2021-12-02 | 广东小天才科技有限公司 | Wearable device and positioning antenna thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021238200A1 (en) * | 2020-05-28 | 2021-12-02 | 广东小天才科技有限公司 | Wearable device and positioning antenna thereof |
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