CN106981719B - Circularly polarized array antenna and communication equipment - Google Patents
Circularly polarized array antenna and communication equipment Download PDFInfo
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- CN106981719B CN106981719B CN201710346951.8A CN201710346951A CN106981719B CN 106981719 B CN106981719 B CN 106981719B CN 201710346951 A CN201710346951 A CN 201710346951A CN 106981719 B CN106981719 B CN 106981719B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a circularly polarized array antenna and communication equipment, wherein each elliptical patch in an elliptical patch array in the antenna is connected with each output port of a feed network through each first microstrip line so as to realize parallel feed, the elliptical patch array and the feed network are arranged on the upper surface of a PCB (printed circuit board), a floor is arranged on the lower surface of the PCB, the floor is provided with elliptical grooves and rectangular patches, and each elliptical groove and each rectangular patch form a group and correspond to one elliptical patch. The elliptical slot and the elliptical patch are provided with a circular seam therebetween so as to form capacitive loading, and the elliptical patch and the rectangular patch are coupled and short-circuited so as to form inductive loading. On the basis, the projection included angles of the long axis of the elliptic patch and the long axis of the elliptic groove and the first microstrip line are both 45 degrees, so that circularly polarized radiation is realized in the working frequency band. Because the sections of the elliptical patch and the first microstrip line are both lower, the occupied volume is smaller, and therefore the miniaturization and low-section design of the antenna can be realized on the basis of circular polarization.
Description
Technical Field
The invention relates to the technical field of radio frequency, in particular to a circularly polarized array antenna and communication equipment.
Background
With the development of modern communication technology, it is difficult to satisfy the communication requirement by performing simple linear polarization on the antenna. On the basis of the linear polarization, a circular polarization is generated. The circularly polarized antenna has the advantages of receiving incoming waves in any polarization mode, receiving radiation waves by the antenna in any polarization mode, having rotation direction orthogonality, being capable of inhibiting cloud and rain interference, resisting multipath reflection and the like.
Microstrip circular polarization antenna combines the advantages of microstrip antenna and circular polarization antenna, and by virtue of good electromagnetic property, the microstrip circular polarization antenna is widely applied to wireless application, such as: measurement, communication, satellite, aerospace, global positioning system, RFID system and other satellite communication, remote control and remote measuring technologies. However, in practical implementation, the circularly polarized antenna is generally large in size, high in profile, heavy, and not easy to assemble and carry.
Therefore, people in the related art of communication equipment have a need to solve the problem of realizing circular polarization, miniaturization and low-profile design of the antenna.
Disclosure of Invention
The invention aims to provide a circularly polarized array antenna and a communication device, which are used for realizing circular polarization, miniaturization and low-profile design.
In order to solve the technical problem, the invention provides a circularly polarized array antenna, which comprises an elliptical patch array, a feed network connected with the elliptical patch array, a PCB (printed circuit board) and a floor, wherein the feed network is connected with the elliptical patch array;
the floor board is arranged on the lower surface of the PCB and provided with elliptical grooves and rectangular patches, each elliptical groove and each rectangular patch form a group and correspond to the elliptical patches, annular gaps are formed between the elliptical grooves and the elliptical patches, the rectangular patches and the elliptical grooves have overlapped parts and are coupled with the elliptical patches for short circuit, and the projection included angles between the long axes of the elliptical patches and the long axes of the elliptical grooves and the first microstrip lines are 45 degrees;
wherein the number of the elliptical patches and the first microstrip lines is 2 n And n is a positive integer.
Preferably, n is 2, the 4 elliptical patches of the elliptical patch array are a first elliptical patch, a second elliptical patch, a third elliptical patch and a fourth elliptical patch in sequence, and the spacing between the first elliptical patch and the second elliptical patch and the spacing between the third elliptical patch and the fourth elliptical patch are the same and are larger than the spacing between the second elliptical patch and the third elliptical patch;
correspondingly, 4 the elliptical trough is first elliptical trough, second elliptical trough, third elliptical trough and fourth elliptical trough in proper order, first elliptical trough with the interval of second elliptical trough the third elliptical trough with the interval of fourth elliptical trough is the same, and is greater than the second elliptical trough with the interval of third elliptical trough, the second elliptical trough with the third elliptical trough intercommunication.
Preferably, the major axis of the elliptical patch is 0.34 times of the wavelength corresponding to the working frequency of the antenna, the ratio of the major axis to the minor axis is 1.0438, and the ratio of the major axis to the minor axis of the elliptical slot is also 1.0438;
wherein the antenna operating frequency is in the 5.8GHz ISM band.
Preferably, the distance between the first elliptical patch and the second elliptical patch, and the distance between the third elliptical patch and the fourth elliptical patch are both half of the wavelength corresponding to the operating frequency of the antenna.
Preferably, the feed network comprises at least one microstrip line and a T-type converter connected with the microstrip line.
Preferably, the feed network specifically includes a second microstrip line with impedance of 50 ohms, a third microstrip line with impedance of 70.71 ohms, a fourth microstrip line with impedance of 100 ohms, and 3T-type converters;
the 4 second microstrip lines are respectively connected with the 4 first microstrip lines and then connected with the 4 third microstrip lines, the 4 third microstrip lines are further connected with the 4 fourth microstrip lines, the 4 fourth microstrip lines are connected with the two first T-shaped converters and the two second T-shaped converters through the first T-shaped converter, the first T-shaped converter and the second T-shaped converter are sequentially connected with the second microstrip lines, the third microstrip lines and the fourth microstrip lines are connected and then connected with the third T-shaped converter, and the third T-shaped converter is connected with the second microstrip lines and serves as a single-point feed interface;
wherein n is 2, and the impedance of the first microstrip line is 50 ohms.
Preferably, the PCB is a rectangular single-layer double-sided PCB, the relative dielectric constant is 4.4, the tangent loss is 0.02, and the thickness is 1mm.
Preferably, the double-sided copper clad plates of the PCB are 35 μm in thickness.
Preferably, the distance between the first elliptical patch and the second elliptical patch and the distance between the third elliptical patch and the fourth elliptical patch are 25mm, the distance between the second elliptical patch and the third elliptical patch is 19mm, the rectangular patch is 15mm long and 1.85mm wide, the horizontal distance between one side of the rectangular patch close to the center of the elliptical groove and the center of the elliptical groove is 6.12mm, and the vertical distance between the bottom edge of the rectangular patch and the center of the elliptical groove is 0.2mm;
the distance between the first elliptical groove and the second elliptical groove and the distance between the third elliptical groove and the fourth elliptical groove are both 25mm, and the distance between the second elliptical groove and the third elliptical groove is 19mm;
and the wavelength corresponding to the working frequency of the antenna is 50mm.
In order to solve the above technical problem, the present invention further provides a communication device including the circularly polarized array antenna.
According to the circularly polarized array antenna provided by the invention, each elliptical patch in the elliptical patch array is connected with the feed network in parallel through each first microstrip line for feeding, the elliptical patch array and the feed network are arranged on the upper surface of the PCB, the floor is arranged on the lower surface of the PCB, the floor is provided with an elliptical slot and rectangular patches, and each elliptical slot and each rectangular patch form a group and correspond to one elliptical patch. The circular seam is arranged between the elliptical groove and the elliptical patch, so that capacitance loading is formed, the elliptical patch and the rectangular patch are in coupling short circuit, so that inductance loading is formed, on the basis, the long axis of the elliptical patch and the projection included angle between the long axis of the elliptical groove and the first microstrip line are both 45 degrees, and therefore circular polarization radiation is achieved in the working frequency band. Because the sections of the elliptical patch and the first microstrip line are lower, the thickness is smaller, and the occupied volume is smaller, the miniaturization and low-section design of the antenna can be realized on the basis of circular polarization, and the antenna is lower in cost, easy to integrate and capable of being widely applied to the field of wireless communication.
In addition, the invention also provides communication equipment comprising the antenna, and the communication equipment also has the beneficial effects.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a structural diagram of a circular polarization array antenna according to an embodiment of the present invention;
FIG. 2 is a block diagram of an elliptical patch array according to an embodiment of the present invention;
fig. 3 is a structural diagram of a feeding network according to an embodiment of the present invention;
FIG. 4 is a block diagram of a floor provided by an embodiment of the present invention;
fig. 5 is a return loss diagram of a circularly polarized array antenna according to an embodiment of the present invention;
fig. 6 is an electromagnetic simulation axial ratio curve diagram of a circularly polarized array antenna according to an embodiment of the present invention;
the reference numbers are as follows: 1 is an elliptical patch array, 2 is a feed network, 3 is a PCB, 4 is a floor, 12 is a first microstrip line, 111 is a first elliptical patch, 112 is a second elliptical patch, 113 is a third elliptical patch, 114 is a fourth elliptical patch, 411 is a first elliptical slot, 412 is a second elliptical slot, 413 is a third elliptical slot, 414 is a fourth elliptical slot, O is a circle center, 21 is a second microstrip line, 22 is a third microstrip line 22, 23 is a fourth microstrip line, 241 is a first T-type converter, 242 is a second T-type converter, 243 is a third T-type converter, and 42 is a rectangular patch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
The core of the invention is to provide a circularly polarized array antenna and a communication device, which are used for realizing circular polarization, miniaturization and low-profile design.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a structural diagram of a circular polarization array antenna according to an embodiment of the present invention. Fig. 2 is a structural diagram of an elliptical patch array according to an embodiment of the present invention. Fig. 3 is a structural diagram of a feeding network according to an embodiment of the present invention. Fig. 4 is a structural diagram of a floor according to an embodiment of the present invention. It should be noted that fig. 1 illustrates an example in which the number of the elliptical patches and the number of the first microstrip lines are 4. As shown in fig. 1, the antenna includes an elliptical patch array 1, a feed network 2 connected to the elliptical patch array 1, a PCB board 3, and a floor 4.
The elliptic patch array 1 comprises elliptic patches and first microstrip lines 12 connected with the elliptic patches, each first microstrip line 12 is connected with the feed network 2 in a parallel feed mode, the elliptic patch array 1 and the feed network 2 are arranged on the upper surface of the PCB 3, the floor 4 is arranged on the lower surface of the PCB 3, the floor 4 is provided with an elliptic groove and a rectangular patch 42, each elliptic groove and each rectangular patch 42 form a group and correspond to the elliptic patches, a circular seam is arranged between the elliptic groove and the elliptic patch 42, the rectangular patch 42 and the elliptic groove have an overlapped part and are coupled and short-circuited with the elliptic patches, and the projection included angles of the long axis of the elliptic patch and the long axis of the elliptic groove and the first microstrip line are both 45 degrees;
wherein the number of the elliptic patches and the first microstrip lines is 2 n And n is a positive integer.
As shown in fig. 1, when n is 2, the elliptical patch array 1 includes 4 elliptical patches, which are a first elliptical patch 111, a second elliptical patch 112, a third elliptical patch 113, and a fourth elliptical patch 114 in this order. The corresponding 4 elliptical grooves are a first elliptical groove 411, a second elliptical groove 412, a third elliptical groove 413 and a fourth elliptical groove 414 in sequence.
The structure of each elliptical patch in a particular implementation is the same, i.e., the second elliptical patch 112, the third elliptical patch 113, and the fourth elliptical patch 114 are the same as the structure of the first elliptical patch 111.
In this embodiment, the projection included angles between the major axis of the elliptical patch and the major axis of the elliptical slot and the first microstrip line 12 are both 45 degrees, so as to obtain two linearly polarized waves with equal amplitudes and 90-degree phase difference, and thus, the radiation of circularly polarized waves can be obtained; in addition, a circular seam formed by the elliptical groove and the elliptical patch forms capacitance loading, and the elliptical patch and the rectangular patch 42 are coupled and short-circuited to form inductance loading, so that circularly polarized radiation is realized in the working frequency band. It should be noted that the formation of the circular seam requires that the area of the elliptical groove be larger than the area of the elliptical patch.
In addition, the elliptical patch and the first microstrip line 12 are low in profile, small in thickness and small in occupied volume, so that if the antenna is mounted on the surface of an aircraft, the low-profile antenna can be well conformal to the surface of the aircraft, and cannot generate additional aerodynamic effect on the aircraft.
In specific implementation, although the coaxial feed can be used to realize circular polarization, the circuit board has a high integration difficulty and is not easy to install. Therefore, in the embodiment, the single-point feed mode is adopted, so that circular polarization can be realized, and the installation is convenient.
In the circularly polarized array antenna provided by this embodiment, each elliptical patch in the elliptical patch array is connected in parallel with the feed network through each first microstrip line for feeding, the elliptical patch array and the feed network are disposed on the upper surface of the PCB, the floor is disposed on the lower surface of the PCB, the floor has an elliptical slot and a rectangular patch, and each elliptical slot and each rectangular patch are a group and correspond to one elliptical patch. The circular seam is arranged between the elliptical groove and the elliptical patch, so that capacitance loading is formed, the elliptical patch and the rectangular patch are in coupling short circuit, so that inductance loading is formed, on the basis, the long axis of the elliptical patch and the projection included angle between the long axis of the elliptical groove and the first microstrip line are both 45 degrees, and therefore circular polarization radiation is achieved in the working frequency band. Because the sections of the elliptical patch and the first microstrip line are lower, the thickness is smaller, and the occupied volume is smaller, the miniaturization and low-section design of the antenna can be realized on the basis of circular polarization, and the antenna is lower in cost, easy to integrate and capable of being widely applied to the field of wireless communication.
It will be appreciated that in particular embodiments, the elliptical patch array and the feed network may be integrated, which may be more convenient in use.
On the basis of the above embodiment, n is 2, the 4 elliptical patches of the elliptical patch array 1 are sequentially the first elliptical patch 111, the second elliptical patch 112, the third elliptical patch 113 and the fourth elliptical patch 114, and the pitches of the first elliptical patch 111 and the second elliptical patch 112 and the pitches of the third elliptical patch 113 and the fourth elliptical patch 114 are all the same and are all larger than the pitch of the second elliptical patch 112 and the third elliptical patch 113.
Correspondingly, the 4 elliptical grooves are a first elliptical groove 411, a second elliptical groove 412, a third elliptical groove 413 and a fourth elliptical groove 414 in sequence, the distance between the first elliptical groove 411 and the second elliptical groove 412 and the distance between the third elliptical groove 413 and the fourth elliptical groove 414 are the same and are larger than the distance between the second elliptical groove 412 and the third elliptical groove 413, and the second elliptical groove 412 is communicated with the third elliptical groove 413.
In order to realize circular polarization, the symmetry of the model is important, so that the stability of the feed network can be enhanced, and therefore, the number of the elliptical patches in the elliptical patch array 1 is 2 in the invention n In this embodiment, n is 2, and if n is 3, 4 elliptical patches in fig. 2 may be regarded as an array element, which is sequentially 8, 16, and 32 in the following, and finally connected to the feeding point through the feeding network 2.
In this embodiment, an overlapping portion is formed between the second elliptical groove 412 and the third elliptical groove 413 on the floor 4, and the overlapping portion is cut away to form communication, so that circularly polarized radiation is realized in the operating frequency band. It is understood that if n is 1, it is equivalent to only the first elliptical groove 411 and the second elliptical groove 412, and thus, there is no need for communication.
In a preferred embodiment, the major axis of the elliptical patch is 0.34 times the wavelength corresponding to the operating frequency of the antenna, the ratio of the major axis to the minor axis is 1.0438, and the ratio of the major axis to the minor axis of the elliptical slot is also 1.0438;
wherein the working frequency of the antenna is 5.8GHz, and the ISM frequency band.
In a preferred embodiment, the distance between the first elliptical patch 111 and the second elliptical patch 112, and the distance between the third elliptical patch 113 and the fourth elliptical patch 114 are both half of the wavelength corresponding to the operating frequency of the antenna.
In this embodiment, the spacing is set to be one half of the wavelength, so that the array element radiation does not have grating lobes, and the directivity can be obtained as large as possible.
In a specific implementation, when the wavelength corresponding to the antenna operating frequency is 50mm, the distance between the first elliptical patch 111 and the second elliptical patch 112, and the distance between the third elliptical patch 113 and the fourth elliptical patch 114 are 25mm, the distance between the second elliptical patch 112 and the third elliptical patch 113 is 19mm, the length of the rectangular patch 42 is 15mm, i.e., L3=15mm, and the width thereof is 1.85mm, i.e., W3=1.85mm, the horizontal distance from the center O of the rectangular patch 42 to the center O of the elliptical trough is 6.12mm, and the vertical distance from the bottom of the rectangular patch 42 to the center O of the elliptical trough is 0.2mm.
The distance between the first elliptical groove 411 and the second elliptical groove 412, the distance between the third elliptical groove 413 and the fourth elliptical groove 414 are both 25mm, and the distance between the second elliptical groove 412 and the third elliptical groove 413 is 19mm.
Accordingly, in this case, the major axis a1 of the elliptical patch is 17.35mm, the minor axis b1 is 16.62mm, the major axis a2 of the elliptical groove is 22mm, and the minor axis b2 is 21.07mm.
On the basis of the above-described embodiment, the feed network 2 includes at least one microstrip line and a T-type transformer connected to the microstrip line.
It is understood that the feeding network 2 is connected to the plurality of first microstrip lines 12 by parallel feeding, and therefore, the selection of the microstrip line type in the feeding network needs to be set according to practical situations, but includes at least one type, and in order to realize single-point feeding, a T-type converter is used. The number of T-type transformers also needs to be determined according to the number of first microstrip lines 12.
As a preferred embodiment, n is 2, the impedance of the first microstrip line 12 is 50 ohms, and when an SMA connector of 50 ohms is required, the following method may be specifically adopted.
The input impedance of the first microstrip line 12 is 50 Ω, the length dimension L2 is 8mm, and the width dimension W2 is 1.82mm. The feed network 2 specifically comprises a second microstrip line 21 with impedance of 50 ohms, a third microstrip line 22 with impedance of 70.71 ohms, a fourth microstrip line 23 with impedance of 100 ohms and 3T-type converters;
the 4 second microstrip lines 21 are respectively connected with the 4 first microstrip lines 12 and then connected with the 4 third microstrip lines 22, the 4 third microstrip lines 22 are then connected with the 4 fourth microstrip lines 23, the 4 fourth microstrip lines 23 are connected in pairs through the first T-type converter 241 and the second T-type converter 242, the first T-type converter 241 and the second T-type converter 242 are both sequentially connected with the second microstrip lines 21, the third microstrip lines 22 and the fourth microstrip lines 23 are then connected through the third T-type converter 243, and the third T-type converter 243 is connected with the second microstrip lines 28 to serve as a single-point feed interface.
In the present invention, the first and second microstrip lines are only for distinguishing the types of microstrip lines, and do not refer to a single microstrip line. For example, in fig. 3, although the second microstrip line 21 is connected between the first microstrip line 12 and the third microstrip line 22, and the second microstrip line 21 is connected between the first T-type converter 241 and the third microstrip line 22, the two microstrip lines are not the same microstrip line, but are of the same type.
It will be appreciated that the type of microstrip line ultimately connected to the third T-shaped transformer will need to be determined by the impedance of the SMA connector.
On the basis of the above embodiment, the PCB 3 is a rectangular single-layer double-sided PCB, and has a relative dielectric constant of 4.4, a tangent loss of 0.02, and a thickness of 1mm.
In a preferred embodiment, the double-sided copper clad laminate of the PCB 3 has a thickness of 35 μm.
In a specific implementation, the PCB 3 may be made of FR4_ epoxy microwave material, and the size of the PCB 3 may be the same as that of the elliptical patch array 1, that is, the length L1 is 109mm, and the width W1 is 63.66mm.
In order to verify the performance of various aspects of the circularly polarized array antenna provided by the embodiment of the invention. Specific simulation diagrams are given below. Fig. 5 is a return loss diagram of a circularly polarized array antenna according to an embodiment of the present invention. As shown in FIG. 5, the antenna has a working center frequency of 5.8GHz, a working frequency band of 4GHz-6GHz, and an absolute bandwidth of 2GHz, so that the requirement of a broadband antenna is met. Fig. 6 is an electromagnetic simulation axial ratio curve diagram of a circular polarization array antenna according to an embodiment of the present invention. As shown in FIG. 5, the axial ratios are all less than 3dB within the range of-45.0 deg-18.9deg of the main radiation direction, which indicates that the circular polarization effect is better.
In the above examples, the embodiments of the circularly polarized array antenna are described in detail, and the present invention also provides a communication apparatus including the circularly polarized array antenna. The communication device comprises the circularly polarized array antenna of the above embodiment in addition to the communication device body.
Since the embodiment of the circularly polarized array antenna portion is described above, the description in this embodiment is omitted. It is understood that the type of the communication device may be an electronic product such as a mobile phone, a tablet computer, and the like.
The communication device provided by the embodiment comprises a circularly polarized array antenna, wherein each elliptical patch in the elliptical patch array is connected with a feed network in parallel through each first microstrip line for feeding, the elliptical patch array and the feed network are arranged on the upper surface of a PCB (printed circuit board), a floor is arranged on the small surface of the PCB, the floor is provided with an elliptical groove and a rectangular patch, and each elliptical groove and each rectangular patch form a group and correspond to one elliptical patch. The circular seam is arranged between the elliptical groove and the elliptical patch, so that capacitance loading is formed, the elliptical patch and the rectangular patch are in coupling short circuit, so that inductance loading is formed, on the basis, the long axis of the elliptical patch and the projection included angle between the long axis of the elliptical groove and the first microstrip line are both 45 degrees, and therefore circular polarization radiation is achieved in the working frequency band. Because the sections of the elliptical patch and the first microstrip line are lower, the thickness is smaller, and the occupied volume is smaller, the miniaturization and low-section design of the antenna can be realized on the basis of circular polarization, and the antenna is lower in cost, easy to integrate and capable of being widely applied to the field of wireless communication.
The circularly polarized array antenna and the communication device provided by the invention are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A circularly polarized array antenna is characterized by comprising an elliptical patch array (1), a feed network (2) connected with the elliptical patch array (1), a PCB (printed circuit board) board (3) and a floor (4);
the elliptical patch array (1) comprises elliptical patches and first microstrip lines (12) connected with the elliptical patches, each first microstrip line (12) is connected with the feed network (2) in a parallel feed mode, the elliptical patch array (1) and the feed network (2) are arranged on the upper surface of the PCB (3), the floor (4) is arranged on the lower surface of the PCB (3), the floor (4) is provided with elliptical grooves and rectangular patches (42), each elliptical groove and each rectangular patch (42) are a group corresponding to the elliptical patches, circular seams are arranged between the elliptical grooves and the elliptical patches, the rectangular patches (42) and the elliptical grooves have overlapped parts and are coupled and short-circuited with the elliptical patches, and the projection included angles between the major axes of the elliptical patches and the major axes of the elliptical grooves and the first microstrip lines (12) are both 45 degrees;
wherein the number of the elliptical patches and the first microstrip line (12) is 2 n N is a positive integer;
and overlapping parts are arranged among the elliptical grooves on the floor, and the overlapping parts are dug out to form communication.
2. The circularly polarized array antenna of claim 1, wherein n is 2, and the 4 elliptical patches of the elliptical patch array (1) are a first elliptical patch (111), a second elliptical patch (112), a third elliptical patch (113) and a fourth elliptical patch (114), in sequence, and the pitches of the first elliptical patch (111) and the second elliptical patch (112), the pitches of the third elliptical patch (113) and the fourth elliptical patch (114) are the same and are all larger than the pitches of the second elliptical patch (112) and the third elliptical patch (113);
correspondingly, 4 the oval groove is first oval groove (411), second oval groove (412), third oval groove (413) and fourth oval groove (414) in proper order, first oval groove (411) with the interval of second oval groove (412) third oval groove (413) with the interval of fourth oval groove (414) is all the same, and is greater than second oval groove (412) with the interval of third oval groove (413), second oval groove (412) with third oval groove (413) intercommunication.
3. The circularly polarized array antenna of claim 2, wherein the major axis of the elliptical patch is 0.34 times the wavelength corresponding to the operating frequency of the antenna, the ratio of the major axis to the minor axis is 1.0438, and the ratio of the major axis to the minor axis of the elliptical slot is 1.0438;
wherein the antenna operating frequency is in the 5.8GHz ISM band.
4. The circularly polarized array antenna of claim 3, wherein the pitch of the first elliptical patch (111) and the second elliptical patch (112), and the pitch of the third elliptical patch (113) and the fourth elliptical patch (114) are each one-half of the wavelength corresponding to the operating frequency of the antenna.
5. The circularly polarized array antenna according to claim 1, wherein the feed network (2) comprises at least one microstrip line and a T-shaped transformer connected to the microstrip line.
6. The circularly polarized array antenna according to claim 5, wherein the feed network (2) comprises a second microstrip line (21) with an impedance of 50 ohms, a third microstrip line (22) with an impedance of 70.71 ohms, a fourth microstrip line (23) with an impedance of 100 ohms, and 3T-type converters;
the four microstrip lines (21) are respectively connected with the four microstrip lines (12) and the four microstrip lines (22), the four microstrip lines (22) are connected with the four microstrip lines (23), the four microstrip lines (23) are connected in pairs through a first T-shaped converter (241) and a second T-shaped converter (242), the first T-shaped converter (241) and the second T-shaped converter (242) are sequentially connected with the four microstrip lines (23), the four microstrip lines (22) are connected with the four microstrip lines (23) and then connected with a third T-shaped converter (243), and the third T-shaped converter (243) is connected with the four microstrip lines (21) and serves as a single-point feed interface;
wherein n is 2, and the impedance of the first microstrip line (12) is 50 ohms.
7. The circularly polarized array antenna of any one of claims 1 to 6, wherein the PCB board (3) is a rectangular single-layer double-sided PCB board with a relative dielectric constant of 4.4, a tangent loss of 0.02 and a thickness of 1mm.
8. The circularly polarized array antenna of claim 7, wherein the double-sided copper clad plates of the PCB board (3) are each 35 μm thick.
9. A circularly polarized array antenna according to claim 3, wherein the spacing between the first elliptical patch (111) and the second elliptical patch (112), and the spacing between the third elliptical patch (113) and the fourth elliptical patch (114) are both 25mm, the spacing between the second elliptical patch (112) and the third elliptical patch (113) is 19mm, the rectangular patch (42) is 15mm long and 1.85mm wide, and the side of the rectangular patch (42) close to the center (O) of the elliptical slot is 6.12mm from the center (O), and the vertical distance between the bottom side of the rectangular patch (42) and the center (O) is 0.2mm;
the distance between the first elliptical groove (411) and the second elliptical groove (412), the distance between the third elliptical groove (413) and the fourth elliptical groove (414) are both 25mm, and the distance between the second elliptical groove (412) and the third elliptical groove (413) is 19mm;
and the wavelength corresponding to the working frequency of the antenna is 50mm.
10. A communication device comprising a circularly polarized array antenna according to any of claims 1 to 9.
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| CN108075225A (en) * | 2018-01-11 | 2018-05-25 | 广东工业大学 | A kind of micro-strip circular polarized antenna and wireless device |
| CN109037938B (en) * | 2018-08-13 | 2020-12-04 | 重庆邮电大学 | Millimeter wave broadband circularly polarized microstrip antenna |
| CN112448147B (en) * | 2019-08-29 | 2022-12-27 | 上海诺基亚贝尔股份有限公司 | Loop patch antenna |
| CN112134012A (en) * | 2020-10-20 | 2020-12-25 | 北京华通嘉业科技有限公司 | Circularly polarized antenna and circularly polarized array antenna |
| CN114824804A (en) * | 2021-01-28 | 2022-07-29 | 京东方科技集团股份有限公司 | Antenna and preparation method thereof |
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| TWI239681B (en) * | 2004-12-22 | 2005-09-11 | Tatung Co Ltd | Circularly polarized array antenna |
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