CN110896678A - Dual-band circularly polarized antenna and communication device - Google Patents
Dual-band circularly polarized antenna and communication device Download PDFInfo
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- CN110896678A CN110896678A CN201880015769.7A CN201880015769A CN110896678A CN 110896678 A CN110896678 A CN 110896678A CN 201880015769 A CN201880015769 A CN 201880015769A CN 110896678 A CN110896678 A CN 110896678A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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Abstract
The embodiment of the invention discloses a dual-frequency circularly polarized antenna and communication equipment. A dual-band circularly polarized antenna (100) includes a dielectric plate (10), an antenna radiation element (20), and a circuit board (30). The dielectric sheet (10) includes a first face (12) and a second face (14) opposite the first face. The antenna radiating element (20) comprises a first circularly polarized antenna radiating element (22) arranged on the first face (12) and a second circularly polarized antenna radiating element (24) arranged on the second face (14). The first resonant frequency of the first circularly polarized antenna radiating element (22) is different from the second resonant frequency of the second circularly polarized antenna radiating element (24). The circuit board (30) is provided with a feed network (40). The feed network (40) electrically connects the first circularly polarized antenna radiating element (22) and the second circularly polarized antenna radiating element (24). According to the dual-frequency circularly polarized antenna (100) provided by the embodiment of the invention, the first circularly polarized antenna radiation array (22) and the second circularly polarized antenna radiation array (24) with different resonant frequencies are arranged on the two sides of the dielectric plate (10), so that the dual-frequency circularly polarized characteristic is realized, the size of the circularly polarized antenna is reduced, and the dual-frequency circularly polarized antenna is convenient to mount.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a dual-frequency circularly polarized antenna and communication equipment.
Background
In the related communication field, compared with a linear polarization antenna, a circularly polarized antenna has strong anti-interference capability, can receive incoming waves of any polarization, and can receive radiation waves of any polarization. Therefore, the circularly polarized antenna has important application in the fields of wireless communication, radar, electronic reconnaissance, electronic interference and the like. However, in the related art, it is difficult to implement the dual-band circular polarization characteristic for the circular polarization antenna, and the circular polarization antenna is generally large in size and inconvenient to install.
Disclosure of Invention
The embodiment of the invention provides a dual-frequency circularly polarized antenna and communication equipment.
The dual-frequency circularly polarized antenna of the embodiment of the invention comprises:
the dielectric plate comprises a first surface and a second surface opposite to the first surface;
the antenna radiation unit comprises a first circularly polarized antenna radiation array arranged on the first surface and a second circularly polarized antenna radiation array arranged on the second surface, and the first resonant frequency of the first circularly polarized antenna radiation array is different from the second resonant frequency of the second circularly polarized antenna radiation array; and
the circuit board is provided with a feed network, and the feed network is electrically connected with the first circularly polarized antenna radiation array and the second circularly polarized antenna radiation array.
According to the dual-frequency circularly polarized antenna provided by the embodiment of the invention, the first circularly polarized antenna radiation array and the second circularly polarized antenna radiation array with different resonant frequencies are arranged on the two sides of the dielectric plate, so that the dual-frequency circularly polarized characteristic is realized, the size of the circularly polarized antenna is reduced, and the dual-frequency circularly polarized antenna is convenient to install.
In some embodiments, the circuit board is opposite to the second face, and the circuit board is parallel to the dielectric board.
In some embodiments, the first circularly polarized antenna radiating element comprises a plurality of first antenna branches spaced apart on the first face, and the second circularly polarized antenna radiating element comprises a plurality of second antenna branches spaced apart on the second face; the surrounding direction of the plurality of first antenna branches is the same as the surrounding direction of the plurality of second antenna branches.
In some embodiments, the plurality of first antenna branches and the plurality of second antenna branches are electrically connected in a one-to-one correspondence to form a plurality of feed ports, and the feed network electrically connects the plurality of feed ports.
In some embodiments, the dual-band circularly polarized antenna includes a plurality of conductive posts, the dielectric plate is spaced apart from the circuit board, and the conductive posts electrically connect the feeding network and the feeding port.
In some embodiments, the first antenna stub has a length equal to a quarter wavelength of the first resonant frequency, the second antenna stub has a length equal to a quarter wavelength of the second resonant frequency, and the first resonant frequency is less than the second resonant frequency.
In some embodiments, the length of the first antenna stub is greater than the length of the second antenna stub.
In some embodiments, the polarization mode of the dual-band circularly polarized antenna is right-hand circular polarization or left-hand circular polarization.
In some embodiments, when the polarization mode of the dual-band circularly polarized antenna is right-hand circular polarization, the feeding network is configured to perform phase delay feeding on the feeding port to implement right-hand circular polarization.
In some embodiments, when the polarization mode of the dual-band circularly polarized antenna is left-hand circular polarization, the feeding network is configured to perform phase-lead feeding on the feeding port to realize left-hand circular polarization.
In some embodiments, the first circularly polarized antenna radiating element includes four first antenna branches, the second circularly polarized antenna radiating element includes four second antenna branches, the four first antenna branches and the four second antenna branches are electrically connected in a one-to-one correspondence manner to form four feeding ports, and the feeding network electrically connects the four feeding ports.
In some embodiments, the four feeding ports are arranged in a clockwise direction and are respectively a first feeding port, a second feeding port, a third feeding port and a fourth feeding port, and the phase-shifted phases of the first feeding port, the second feeding port, the third feeding port and the fourth feeding port sequentially increase, and the increase amplitudes are the same.
In some embodiments, the feed network includes a first phase shifter and two second phase shifters, the first phase shifter connects the two second phase shifters, the antenna radiating element includes four feed ports electrically connecting the first circularly polarized antenna radiating element and the second circularly polarized antenna radiating element, one of the second phase shifters connects two of the feed ports, and the phase shift phase of the first phase shifter is twice the phase shift phase of the second phase shifter.
The communication device of the embodiment of the invention comprises a machine body and the dual-frequency circularly polarized antenna of any one of the embodiments, wherein the dual-frequency circularly polarized antenna is arranged on the machine body.
In the communication equipment of the embodiment of the invention, the first circularly polarized antenna radiation array and the second circularly polarized antenna radiation array with different resonant frequencies are arranged on the two sides of the dielectric plate of the double-frequency circularly polarized antenna, so that the double-frequency circularly polarized characteristic is realized, the size of the circularly polarized antenna is reduced, and the installation is convenient.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a dual-band circularly polarized antenna according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a first face of a dielectric sheet according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a second face of a dielectric sheet according to an embodiment of the present invention;
FIG. 4 is a schematic perspective view of a dual-band circularly polarized antenna according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a feed network according to an embodiment of the present invention;
FIG. 6 is a return loss diagram of a dual-band circularly polarized antenna according to an embodiment of the present invention;
FIG. 7 is a right-hand schematic view of a dual-band circularly polarized antenna according to an embodiment of the present invention at a low frequency;
FIG. 8 is a right-hand schematic view of a dual-band circularly polarized antenna of an embodiment of the present invention at high frequencies;
FIG. 9 is a schematic diagram of the elevation axial ratio of the dual-band circularly polarized antenna of the embodiment of the invention at low frequency;
fig. 10 is a schematic diagram of the elevation surface axial ratio of the dual-band circularly polarized antenna according to the embodiment of the present invention at high frequency.
Description of the main element symbols:
the dual-band circularly polarized antenna comprises a dual-band circularly polarized antenna 100, a dielectric plate 10, a first face 12, a second face 14, an antenna radiation unit 20, a first circularly polarized antenna radiation array 22, a first antenna branch 222, a second circularly polarized antenna radiation array 24, a second antenna branch 242, a circuit board 30, a feed network 40, a first phase shifter 42, a second phase shifter 44, an RF port 46, a feed port 50, a first feed port 52, a second feed port 54, a third feed port 56, a fourth feed port 58, a conductive column 60 and a support column 70.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations and positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the embodiments of the present invention. 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the embodiments of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
Referring to fig. 1 to 5, a dual-band circularly polarized antenna 100 according to an embodiment of the present invention includes a dielectric plate 10, an antenna radiation unit 20, and a circuit board 30. The dielectric sheet 10 includes a first face 12 and a second face 14 opposite the first face 12. The antenna radiating element 20 comprises a first circularly polarized antenna radiating element 22 disposed on the first face 12 and a second circularly polarized antenna radiating element 24 disposed on the second face 14. The first resonant frequency of the first circularly polarized antenna radiating element 22 is different from the second resonant frequency of the second circularly polarized antenna radiating element 24. The circuit board 30 is provided with a feeding network 40. The feed network 40 electrically connects the first and second circularly polarized antenna radiating elements 22, 24.
According to the dual-frequency circularly polarized antenna 100 of the embodiment of the invention, the first circularly polarized antenna radiation array 22 and the second circularly polarized antenna radiation array 24 with different resonant frequencies are arranged on the two sides of the dielectric plate 10, so that the dual-frequency circularly polarized characteristic is realized, the size of the circularly polarized antenna is reduced, and the dual-frequency circularly polarized antenna is convenient to install.
Specifically, the dielectric plate 10 may be a double-sided cylindrical PCB, and the first circular polarization antenna radiation element 22 is printed on the first side 12 of the dielectric plate 10, and the second circular polarization antenna radiation element 24 is printed on the second side 14 of the dielectric plate 10 to form the antenna radiation unit 20. In the example of fig. 1, the first face 12 is an upper face and the second face 14 is a lower face. In other embodiments, the first side 12 may be a lower surface and the second side 14 may be an upper surface.
The dual-frequency circularly polarized antenna 100 of the embodiment of the present invention can be applied to the technical fields of unmanned aerial vehicles, surveying and mapping, Real-time kinematic (RTK), and the like.
In the embodiment of the present invention, the first circularly polarized antenna radiating element 22 includes a plurality of first antenna branches 222 spaced apart on the first side 12, and the second circularly polarized antenna radiating element 24 includes a plurality of second antenna branches 242 spaced apart on the second side 14. The direction of the first plurality of antenna branches 222 is the same as the direction of the second plurality of antenna branches 242. And the plurality of first antenna branches 222 and the plurality of second antenna branches 242 are electrically connected in a one-to-one correspondence to form a plurality of feeding ports 50. The feed network 40 electrically connects a plurality of feed ports 50.
Specifically, in the example of fig. 2-4, the first circularly polarized radiating element includes four first antenna branches 222 and the second circularly polarized radiating element includes four second antenna branches 242. The surrounding direction of the plurality of first antenna branches 222 is the same as the surrounding direction of the plurality of second antenna branches 242, and it can be understood that the surrounding directions of the first antenna branches 222 and the second antenna branches 242 are the same when viewed from the same direction, as shown in fig. 4. Referring to fig. 4, when the first antenna branch 222 and the second antenna branch 242 both wind right, i.e. wind clockwise, the polarization mode of the dual-band circularly polarized antenna 100 is right-hand circularly polarized. When the first antenna branch 222 and the second antenna branch 242 both wind left, i.e., surround counterclockwise, the polarization mode of the dual-band circularly polarized antenna 100 is left-handed circular polarization.
Further, the four first antenna branches 222 are electrically connected to the four second antenna branches 242 in a one-to-one correspondence to form four feeding ports 50. The feed network 40 electrically connects the four feed ports 50. The four feed ports 50 are arranged in a clockwise direction as shown in fig. 4 as a first feed port 52, a second feed port 54, a third feed port 56 and a fourth feed port 58, respectively. The phase-shifted phases of the first, second, third and fourth feed ports 52, 54, 56 and 58 are sequentially increased, and the magnitude of the increase is the same.
It is understood that the four first antenna branches 222 and the four second antenna branches 242 may be electrically connected in a one-to-one correspondence by way of VIAs (VIA) to form the four feeding ports 50. Specifically, in the via manner, a via hole penetrating through the first surface 112 and the second surface 14 of the dielectric plate 10 may be formed, and then a conductive material, such as copper, may be formed on a wall of the via hole, and the conductive material connects the first antenna branch 222 and the second antenna branch 242.
In one example, the current or voltage is 0 degrees in phase at the first feed port 52, 90 degrees in phase at the second feed port 54, 180 degrees in phase at the third feed port 56, and 270 degrees in phase at the fourth feed port 58. The phase-shifted phases of the four feed ports 50 are sequentially increased by 90 degrees.
In an embodiment of the present invention, the length of the first antenna stub 222 is equal to a quarter wavelength of the first resonant frequency. The length of the second antenna stub 242 is equal to a quarter wavelength of the second resonant frequency. The first resonant frequency is less than the second resonant frequency.
Thus, the first antenna branch 222 and the second antenna branch 242 are both quarter-wave monopole antennas, i.e., the length of the first antenna branch 222 is equal to the quarter-wave of the first resonant frequency, and the length of the second antenna branch 242 is equal to the quarter-wave of the second resonant frequency. In the embodiment of the present invention, the first resonance frequency may be set to a low frequency, and the second resonance frequency may be set to a high frequency, that is, the first resonance frequency is smaller than the second resonance frequency. Since the wavelength is equal to the speed of light divided by the frequency, the length of first antenna branch 222 corresponding to the first resonant frequency is greater than the length of second antenna branch 242 corresponding to the second resonant frequency.
In the embodiment of the present invention, when the polarization mode of the dual-band circularly polarized antenna 100 is right-hand circular polarization, the feeding network 40 is configured to perform phase delay feeding on the feeding port 50 to implement right-hand circular polarization.
It can be understood that, referring to fig. 4, in order to rotate the current on the antenna branches clockwise to radiate right-hand circularly polarized electromagnetic waves, the feeding port 50 needs to be fed with phase delay. When the length of the antenna branch is one quarter of the resonant frequency, the phase change corresponding to the current or voltage is 90 degrees, and the phase change corresponding to one wavelength can be considered as 360 degrees, the 90-degree phase feed energy is sequentially delayed at the four feed ports 50, and the energy on the antenna branch sequentially rotates clockwise, so that the right-hand circularly polarized electromagnetic wave is radiated. In fig. 4, an arc line with an arrow indicates a surface current flowing direction on the antenna branches when the dual-band circularly polarized antenna 100 resonates.
Specifically, taking the first antenna branch 222 as an example, when the feeding phases are respectively delayed by 90 degrees from the first feeding port 52 to the fourth feeding port 58, the current flows out from the first feeding port 52 and rotates clockwise along the first antenna branch 222. When the first antenna branch 222 is at the end, since the length of the first antenna branch 222 is a quarter wavelength of the first resonant frequency, the corresponding current phase difference is 90 degrees, at this time, the second feeding port 54 starts to flow out current, and the current from the first feeding port 52 continue to rotate clockwise equivalently and continuously. And so on to the fourth feed port 54. The current rotates clockwise in a period of 0 to 360 degrees, so that the dual-band circularly polarized antenna 100 radiates right-hand circularly polarized electromagnetic waves.
Referring to fig. 6 to 10, simulation tests are performed on a right-hand circularly polarized dual-band circularly polarized antenna 100 according to an embodiment of the present invention to obtain data as shown in the figures. In fig. 6, the dual-band circularly polarized antenna 100 has a resonance at 1.285GHz (first resonance frequency) and 1.541GHz (second resonance frequency), respectively, and a bandwidth greater than 50 MHz. In fig. 7, the dual-band circularly polarized antenna 100 radiates mainly right-hand circularly polarized waves at 1.298GHz with a main beam field strength (gain) of 4.75dBi, a main beam orientation of 0.0deg., and a beam width of 113.7 deg.. In fig. 8, the dual-band circularly polarized antenna 100 radiates mainly right-hand circularly polarized waves at 1.574GHz with a main beam field strength (gain) of-0.403 dBi, a main beam orientation of 0.0deg., and a beam width of 113.7 deg.. In fig. 9, the axial ratio of the elevation plane of the dual-band circularly polarized antenna 100 in the horizontal plane is better than 3dB at 1.298GHz, and the main beam field strength is 40 dB. In fig. 10, the axial ratio of the pitch plane to the horizontal plane of the dual-band circularly polarized antenna 100 is better than 3dB at 1.574GHz, and the main beam field strength is 40 dB.
In the embodiment of the present invention, when the polarization mode of the dual-band circularly polarized antenna 100 is left-hand circular polarization, the feeding network 40 is configured to perform phase-advance feeding on the feeding port 50 to implement left-hand circular polarization.
It will be appreciated that in order to rotate the current on the antenna branches in a counter-clockwise direction to radiate left-hand circularly polarised electromagnetic waves, a phase lead feed is required to the feed port 50. The length of the antenna branch is a quarter of the resonant frequency, the phase of the current or voltage changes by 90 degrees, the phase corresponding to one wavelength changes by 360 degrees, the energy is fed into the four feeding ports 50 sequentially by advancing the phases by 90 degrees, and the energy on the antenna branch rotates counterclockwise in sequence, so that left-handed circularly polarized electromagnetic waves are radiated.
Referring to fig. 5, in the embodiment of the present invention, the feeding network 40 includes a first phase shifter 42 and two second phase shifters 44. The first phase shifter 42 is connected to two second phase shifters 44. The antenna radiating element 20 comprises four feed ports 50 electrically connecting the first 22 and second 24 circularly polarized antenna radiating elements. One second phase shifter 44 connects the two feed ports 50 correspondingly. The phase shifted phase of the first phase shifter 42 is twice the phase shifted phase of the second phase shifter 44.
In particular, the phase shifter may be a phase retarder or a digital phase shifter. In the example of fig. 5, the corresponding polarization mode of the feed network 40 is right-hand circular polarization. The first phase shifter 42 is a 180-degree digital phase shifter and the second phase shifter 44 is a 90-degree digital phase shifter. A phase 0 degree signal is output from the RF (radio frequency) port 46, and a phase 0 degree signal and a phase 180 degree signal are obtained by passing through a 180 degree digital phase shifter, and then a phase 0 degree signal and a phase 90 degree signal are obtained by passing through a 90 degree digital phase shifter, and a phase 0 degree signal and a phase 180 degree signal and a phase 270 degree output signal are obtained by passing through another 90 degree digital phase shifter. A phase 0 degree signal is transmitted to the first feed port 52, a phase 90 degree signal is transmitted to the second feed port 54, a phase 180 degree signal is transmitted to the third feed port 56, and a phase 270 degree signal is transmitted to the fourth feed port 58.
Referring to fig. 1, in the embodiment of the invention, the circuit board 30 is disposed right under the dielectric plate 10, the circuit board 30 is opposite to the second surface 14 of the dielectric plate 10, and the circuit board 30 is parallel to the dielectric plate 10. The side of the circuit board 30 opposite the second side 14 is printed with a feed network 40.
It will be appreciated that a corresponding electrical connection of the first antenna branch 222 with the second antenna branch 242 forms the feed port 50. The dielectric plate 10 is spaced apart from the circuit board 30, and the dual-band circularly polarized antenna 100 includes a plurality of conductive pillars 60, where the conductive pillars 60 electrically connect the feeding port 50 and the feeding network 40. In this manner, the feed network 40 electrically connects the first and second circularly polarized antenna radiating elements 22 and 24.
Further, the conductive post 60 may be made of a metal material such as copper. Since the dielectric board 10 is spaced from the circuit board 30 and the circuit board 30 is disposed directly below the dielectric board 10, a plurality of support columns 70 are disposed between the dielectric board 10 and the circuit board 30 to space the dielectric board 10 and the circuit board 30 apart. The support posts 70 may be made of an insulating material.
The embodiment of the invention provides communication equipment. The communication device comprises a body and a dual-band circularly polarized antenna 100 of any of the embodiments described above. The dual-band circularly polarized antenna 100 is mounted in the body.
In the communication device according to the embodiment of the present invention, the dual-band circularly polarized antenna 100 has the first circularly polarized antenna radiation array 22 and the second circularly polarized antenna radiation array 24 with different resonant frequencies on both sides of the dielectric plate 10, so that the dual-band circularly polarized characteristic is realized, the size of the circularly polarized antenna is reduced, and the mounting is facilitated.
Specifically, the communication device includes, but is not limited to, an unmanned aerial vehicle, a remote controller connected to the unmanned aerial vehicle, a surveying and mapping device, an RTK (Real-time kinematic) device, and the like, which are capable of wireless communication.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The above disclosure provides many different embodiments, or examples, for implementing different features of the invention. The components and arrangements of the specific examples are described above to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (18)
1. A dual-band circularly polarized antenna, comprising:
the dielectric plate comprises a first surface and a second surface opposite to the first surface;
the antenna radiation unit comprises a first circularly polarized antenna radiation array arranged on the first surface and a second circularly polarized antenna radiation array arranged on the second surface, and the first resonant frequency of the first circularly polarized antenna radiation array is different from the second resonant frequency of the second circularly polarized antenna radiation array; and
the circuit board is provided with a feed network, and the feed network is electrically connected with the first circularly polarized antenna radiation array and the second circularly polarized antenna radiation array.
2. The dual-band circularly polarized antenna of claim 1, wherein the first circularly polarized antenna radiating element comprises a first plurality of antenna branches spaced apart on the first face, and the second circularly polarized antenna radiating element comprises a second plurality of antenna branches spaced apart on the second face;
the surrounding direction of the plurality of first antenna branches is the same as the surrounding direction of the plurality of second antenna branches.
3. The dual-band circularly polarized antenna of claim 2, wherein said plurality of first antenna branches are electrically connected to said plurality of second antenna branches in a one-to-one correspondence to form a plurality of feed ports, and said feed network electrically connects said plurality of feed ports.
4. The dual-band circularly polarized antenna of claim 3, wherein said dual-band circularly polarized antenna comprises a plurality of conductive posts, said dielectric plate being spaced from said circuit board, said conductive posts electrically connecting said feed network and said feed port.
5. The dual-band circularly polarized antenna of claim 2, wherein said first antenna stub has a length equal to a quarter wavelength of said first resonant frequency, said second antenna stub has a length equal to a quarter wavelength of said second resonant frequency, and said first resonant frequency is less than said second resonant frequency.
6. The dual-band circularly polarized antenna of claim 3, wherein the polarization mode of said dual-band circularly polarized antenna is right-hand circular polarization or left-hand circular polarization.
7. The dual-band circularly polarized antenna of claim 6, wherein when the polarization mode of the dual-band circularly polarized antenna is right-hand circular polarization, the feeding network is configured to perform phase-delayed feeding on the feeding port to realize right-hand circular polarization.
8. The dual-band circularly polarized antenna of claim 6, wherein when the polarization mode of the dual-band circularly polarized antenna is left-hand circular polarization, the feeding network is configured to perform phase-lead feeding on the feeding port to realize left-hand circular polarization.
9. The dual-band circularly polarized antenna of claim 1, wherein said feed network comprises a first phase shifter and two second phase shifters, said first phase shifter connecting said two second phase shifters, said antenna radiating element comprising four feed ports electrically connecting said first circularly polarized antenna radiating element and said second circularly polarized antenna radiating element, one of said second phase shifters connecting two of said feed ports, said first phase shifter having a phase shifted phase twice that of said second phase shifter.
10. A communication device comprising a body and a dual-band circularly polarized antenna mounted to the body, the dual-band circularly polarized antenna comprising:
the dielectric plate comprises a first surface and a second surface opposite to the first surface;
the antenna radiation unit comprises a first circularly polarized antenna radiation array arranged on the first surface and a second circularly polarized antenna radiation array arranged on the second surface, and the first resonant frequency of the first circularly polarized antenna radiation array is different from the second resonant frequency of the second circularly polarized antenna radiation array; and
the circuit board is provided with a feed network, and the feed network is electrically connected with the first circularly polarized antenna radiation array and the second circularly polarized antenna radiation array.
11. The communications device of claim 10, wherein the first circularly polarized antenna radiating element includes a first plurality of antenna branches spaced apart on the first face, and the second circularly polarized antenna radiating element includes a second plurality of antenna branches spaced apart on the second face;
the surrounding direction of the plurality of first antenna branches is the same as the surrounding direction of the plurality of second antenna branches.
12. The communication device of claim 11, wherein the plurality of first antenna stubs are electrically connected to the plurality of second antenna stubs in a one-to-one correspondence to form a plurality of feed ports, and wherein the feed network electrically connects the plurality of feed ports.
13. The communications device of claim 12, wherein said dual-band circularly polarized antenna includes a plurality of conductive posts, said dielectric plate being spaced from said circuit board, said conductive posts electrically connecting said feed network and said feed port.
14. The communication device of claim 11, wherein the first antenna stub has a length equal to a quarter wavelength of the first resonant frequency, the second antenna stub has a length equal to a quarter wavelength of the second resonant frequency, and the first resonant frequency is less than the second resonant frequency.
15. The communications device of claim 12, wherein said dual-band circularly polarized antenna is polarized in either a right-hand circular polarization or a left-hand circular polarization.
16. The communications device of claim 15, wherein when the dual-band circularly polarized antenna is polarized in a right-hand circular polarization, the feed network is configured to phase delay feed the feed port to achieve right-hand circular polarization.
17. The communication device of claim 15, wherein the feed network is configured to phase-advance feed the feed port to achieve left-hand circular polarization when the polarization mode of the dual-band circularly polarized antenna is left-hand circular polarization.
18. The communications device of claim 10, wherein said feed network includes a first phase shifter and two second phase shifters, said first phase shifter connecting said two second phase shifters, said antenna radiating element including four feed ports electrically connecting said first circularly polarized antenna radiating element and said second circularly polarized antenna radiating element, one of said second phase shifters connecting two of said feed ports, said first phase shifter having a phase shifted phase twice that of said second phase shifter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820984456.XU CN208299053U (en) | 2018-06-22 | 2018-06-22 | Double frequency round polarized antenna and communication equipment |
| PCT/CN2018/106243 WO2019242130A1 (en) | 2018-06-22 | 2018-09-18 | Dual-frequency circularly-polarized antenna and communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110896678A true CN110896678A (en) | 2020-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820984456.XU Expired - Fee Related CN208299053U (en) | 2018-06-22 | 2018-06-22 | Double frequency round polarized antenna and communication equipment |
| CN201880015769.7A Pending CN110896678A (en) | 2018-06-22 | 2018-09-18 | Dual-band circularly polarized antenna and communication device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820984456.XU Expired - Fee Related CN208299053U (en) | 2018-06-22 | 2018-06-22 | Double frequency round polarized antenna and communication equipment |
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| CN (2) | CN208299053U (en) |
| WO (1) | WO2019242130A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094315A (en) * | 2020-08-24 | 2022-02-25 | 千寻位置网络有限公司 | Eight-arm spiral double-frequency circularly polarized antenna |
| WO2023240481A1 (en) * | 2022-06-15 | 2023-12-21 | 京东方科技集团股份有限公司 | Dual-frequency antenna and electronic device |
| WO2024119364A1 (en) * | 2022-12-06 | 2024-06-13 | 广东高驰运动科技股份有限公司 | Circularly polarized antenna and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110311213B (en) * | 2019-06-27 | 2024-05-14 | 江苏三和欣创通信科技有限公司 | Circularly polarized antenna device |
| CN110247170B (en) * | 2019-06-27 | 2024-05-14 | 江苏三和欣创通信科技有限公司 | High-isolation circularly polarized antenna device |
| CN110534878A (en) * | 2019-08-26 | 2019-12-03 | 华南理工大学 | A kind of miniaturization UHF antenna based on split ring resonator load |
| CN111816990B (en) * | 2020-06-03 | 2024-04-26 | 昆山睿翔讯通通信技术有限公司 | Circular polarization implementation mode |
| US11988740B2 (en) * | 2020-09-08 | 2024-05-21 | Anduril Industries, Inc. | Millimeter wavelength radar antenna for drone interception |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN208299053U (en) | 2018-12-28 |
| WO2019242130A1 (en) | 2019-12-26 |
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