CN114552220B - Single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed and wireless communication equipment - Google Patents
Single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed and wireless communication equipment Download PDFInfo
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- CN114552220B CN114552220B CN202210227466.XA CN202210227466A CN114552220B CN 114552220 B CN114552220 B CN 114552220B CN 202210227466 A CN202210227466 A CN 202210227466A CN 114552220 B CN114552220 B CN 114552220B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
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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
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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
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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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
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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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
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
- H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
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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
Abstract
The invention belongs to the technical field of wireless communication, and in particular relates to a single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed and wireless communication equipment, comprising: the upper layer printed circuit board and the lower layer printed circuit board are provided with a supporting structure therebetween, so that an intermediate air layer is formed between the upper layer printed circuit board and the lower layer printed circuit board; the upper surface of the upper layer printed circuit board is provided with a square patch metal layer, and the lower surface of the upper layer printed circuit board is provided with a square annular patch metal layer; the upper surface of the lower layer printed circuit board is provided with a metal layer, and the lower surface is provided with a feed network with two branch microstrip transmission lines; the metal layer is etched with two strip gaps, and the feed network is respectively connected with the two strip gaps of the metal layer in an electromagnetic coupling way; the dual-frequency dual-circular polarization filter antenna adopts a microstrip structure, and has the advantages of light weight, low cost and easiness in processing.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed and wireless communication equipment.
Background
The uplink and downlink in modern satellite communication systems operate at different frequencies, and if a dual-frequency characteristic antenna with a shared aperture is used, the size and cost of the antenna will be greatly reduced; the circular polarized antenna can receive incoming waves with any linear polarization, and electromagnetic waves radiated by the circular polarized antenna can be received by any linear polarized antenna, so that the relative installation posture between the transmitting antenna and the receiving antenna is not limited by torsion angles, and the installation of the receiving antenna is facilitated. For example, in the vehicle satellite communication, in the process of accurately aligning the receiver in the vehicle, since the linear polarization antenna can only receive the information sent by the linear polarization antenna, it is extremely difficult to receive the information sent by other antennas, but since the circular polarization antenna can receive the information sent by any other linear polarization antennas, the research of the single-port feed shared aperture dual-frequency dual-circular polarization antenna has higher practical application value.
The prior dual-frequency characteristic antenna has the following technical defects: 1) The existing dual-frequency characteristic antenna adopts dual-port feed to realize dual-frequency circular polarization characteristics, so that the isolation degree between antenna ports is poor; 2) The existing dual-frequency characteristic antenna adopts multiple antennas to realize dual-frequency dual-circular polarization characteristics, and has the disadvantages of large size, complex design and high design cost; 3) The dual-frequency characteristic antenna adopts a coaxial feed mode, and the mode is not beneficial to the design of a large-scale antenna array.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feeding, which comprises: the upper layer printed circuit board and the lower layer printed circuit board are provided with a supporting structure therebetween, so that an intermediate air layer is formed between the upper layer printed circuit board and the lower layer printed circuit board;
the upper surface of the upper layer printed circuit board is provided with a square patch metal layer, the lower surface of the upper layer printed circuit board is provided with a square annular patch metal layer, wherein the square patch metal layer on the upper surface is used as a high-frequency radiator of the antenna, and the square annular patch metal layer on the lower surface is used as a low-frequency radiator of the antenna;
the upper surface of the lower layer printed circuit board is provided with a metal layer, and the lower surface is provided with a feed network with two branch microstrip transmission lines; the metal layer is etched with two strip gaps, namely a low-frequency feed gap and a high-frequency feed gap; the two branch microstrip transmission lines of the feed network are respectively a low-frequency feed branch and a high-frequency feed branch; one end of the low-frequency feed branch is connected with a port of the antenna by adopting a microstrip transmission line, and the other end of the low-frequency feed branch is connected with the low-frequency feed slot in an electromagnetic coupling way; one end of the high-frequency feed branch is connected with the port of the antenna by adopting a microstrip transmission line, and the other end of the high-frequency feed branch is connected with the high-frequency feed gap by electromagnetic coupling.
Preferably, the support structure is 4 plastic long screws, and the upper end and the lower end of each plastic long screw are provided with threads; four plastic long screws are respectively arranged on four corners of the upper layer printed circuit board and the lower layer printed circuit board, so that an intermediate air layer is formed between the upper layer printed circuit board and the lower layer printed circuit board.
Preferably, the square patch metal layer has a square structure, and a group of diagonal corners of the square patch metal layer are cut; the square annular patch metal layer is of a square annular structure, and a group of outer diagonal corner cuts of the square annular patch metal layer.
Further, the annular space of square annular patch metal layer is bigger than square patch metal layer, and in the process of setting square patch metal layer and square annular patch metal layer on upper printed circuit board, the square patch metal layer is set on the central position point corresponding to annular space of square annular patch metal layer, and the chamfer of square patch metal layer and chamfer of square annular patch metal layer are located same direction.
Preferably, the low frequency feed slot and the high frequency feed slot on the upper surface metal layer of the lower printed circuit board are perpendicular to each other and do not intersect.
Further, the length of the low-frequency feed slot is shorter than that of the high-frequency feed slot, namely, the length of the low-frequency feed slot is 10.0-10.5 mm, and the slot width is 0.3-0.6 mm; the length of the high-frequency feed gap is 7.0 mm-7.5 mm, and the width of the gap is 0.3 mm-0.6 mm.
Preferably, the length of the low frequency feed branches in the feed network is shorter than the length of the high frequency feed branches.
A wireless communication device comprising a single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feeding in any of the above embodiments.
The invention has the beneficial effects that:
the invention designs a single-port double-frequency double-circular polarization filter antenna based on transmission line feed, which adopts a microstrip transmission line as a feed network and adopts a slot coupling feed mode, so that the designed antenna can be expanded to a large-scale antenna array; the high-frequency radiation unit and the low-frequency radiation unit share the same printed circuit board, when the low-frequency patch is fed, the high-frequency feeder serves as a low-frequency filtering branch, and when the high-frequency patch is fed, the low-frequency feeder serves as a high-frequency filtering branch, so that the antenna has a good filtering function; the dual-frequency dual-circular polarization filter antenna adopts a microstrip structure, and has the advantages of light weight, low cost and easiness in processing.
Drawings
FIG. 1 is a top view of a single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feed of the present invention;
fig. 2 is a bottom view of a single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feeding according to the present invention;
FIG. 3 is a side view of a single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feed of the present invention;
FIG. 4 is a diagram showing simulation and test S parameters of a single-port dual-frequency dual-circular polarization filter antenna based on microstrip transmission line feeding;
FIG. 5 is a graph showing the gain versus axial ratio of a single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feed of the present invention;
fig. 6 is a single-port dual-frequency dual-circular polarization filter antenna pattern based on microstrip transmission line feeding of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention designs a single-port double-frequency double-circular polarization filter antenna based on transmission line feed, which is applied to satellite communication, in order to solve the problems of poor isolation degree, large volume, complex design and high design cost between antenna ports in the existing double-frequency characteristic antenna. The antenna adopts a transmission line as a feed network, and the integrated design of the filter and the antenna is realized. The impedance bandwidth of the antenna is 5.80GHz-6.10GHz and 9.20GHz-10.64GHz. The antenna has a good filtering function, and can effectively realize isolation between receiving and transmitting channels. The antenna is composed of a common printed circuit board and has the technical characteristics of low cost and easiness in processing.
A single-port dual-frequency dual-circular polarization filter antenna based on microstrip transmission line feeding, as shown in fig. 1 to 3, the filter antenna comprises: the upper layer printed circuit board and the lower layer printed circuit board are provided with a supporting structure therebetween, so that an intermediate air layer is formed between the upper layer printed circuit board and the lower layer printed circuit board.
A single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feeding is provided, wherein a square patch metal layer is arranged on the upper surface of an upper printed circuit board of the filter antenna, a square annular patch metal layer is arranged on the lower surface of the upper printed circuit board, the square patch metal layer on the upper surface is used as a high-frequency radiator of the antenna, and the square annular patch metal layer on the lower surface is used as a low-frequency radiator of the antenna.
Optionally, the antenna low frequency radiator is a square annular patch metal layer, the metal-free part in the center of the square annular patch metal layer is square, the square of the metal-free part in the center of the square annular patch metal layer is larger than the area of the antenna high frequency radiator, the design is convenient for feeding the high frequency radiator, meanwhile, the coupling between the antenna high frequency radiator and the low frequency radiator can be reduced, and the antenna high frequency radiator and the low frequency radiator share the caliber. Specifically, the square patch metal layer is of a square structure, and a group of diagonal corners of the square patch metal layer are cut; the square annular patch metal layer is of a square annular structure, and a group of outer diagonal corner cuts of the square annular patch metal layer. The annular space of square annular patch metal layer is bigger than square annular patch metal layer, and in the course of setting square patch metal layer and square annular patch metal layer on upper printed circuit board, set up square patch metal layer on the central point that corresponds with the annular space of square annular patch metal layer, and the chamfer of square patch metal layer is located same direction with the chamfer of square annular patch metal layer.
The square patch metal layer on the upper surface of the upper layer printed circuit board is used as an antenna high-frequency radiator, and the opposite angles of the high-frequency radiator are cut, so that the left-hand circularly polarized wave is radiated. The square annular patch metal layer on the lower surface of the upper printed circuit board is used as an antenna low-frequency radiator and is used as a diagonal corner cutting angle of the antenna low-frequency radiator, so that right-hand circularly polarized waves are radiated, the square ring is formed by subtracting a square larger than the high-frequency radiator from a large square center, the design is convenient for feeding the high-frequency radiator, the coupling between the high-frequency radiator and the low-frequency radiator can be reduced, and the high-frequency radiator and the low-frequency radiator share the caliber.
A single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed is provided, wherein a metal layer is arranged on the upper surface of a lower layer printed circuit board of the filter antenna, and a feed network with two branch microstrip transmission lines is arranged on the lower surface of the lower layer printed circuit board; the metal layer is etched with two strip gaps, namely a low-frequency feed gap and a high-frequency feed gap; the two branch microstrip transmission lines of the feed network are respectively a low-frequency feed branch and a high-frequency feed branch; one end of the low-frequency feed branch is connected with a port of the antenna by adopting a microstrip transmission line, and the other end of the low-frequency feed branch is connected with the low-frequency feed slot in an electromagnetic coupling way; one end of the high-frequency feed branch is connected with the port of the antenna by adopting a microstrip transmission line, and the other end of the high-frequency feed branch is connected with the high-frequency feed gap by electromagnetic coupling.
The upper surface of the lower layer printed circuit board is provided with a metal layer which is used as a floor, and 2 strip gaps, namely a low-frequency feed gap a and a high-frequency feed gap b, are etched on the floor. The low frequency feed slit a and the high frequency feed slit b are perpendicular to each other but do not intersect.
The low-frequency feed slot is in electromagnetic coupling connection with an antenna low-frequency radiator, and the antenna low-frequency radiator radiates the fed electromagnetic energy into the space to radiate right-handed circularly polarized electromagnetic waves to obtain a low-frequency working frequency band; the high-frequency feed slot is in electromagnetic coupling connection with the antenna high-frequency radiator, and the antenna high-frequency radiator radiates the fed electromagnetic energy to the space to form a left-hand circularly polarized electromagnetic wave, so that a high-frequency working frequency band is obtained; the antenna low-frequency radiator and the antenna high-frequency radiator share the same printed circuit board and share the aperture.
The lower surface of the lower layer printed circuit board is provided with a feed network consisting of branch transmission lines, when the low-frequency radiator is fed, the high-frequency feed branches are used as low-frequency filtering branches, the high-impedance characteristic is presented, and when the high-frequency radiator is fed, the low-frequency feed branches are used as high-frequency filtering branches, the high-impedance characteristic is presented, so that the antenna has a good filtering function; in addition, the design method expands the impedance bandwidth of the antenna.
Alternatively, the low frequency feed slot and the high frequency feed slot of the upper surface of the lower printed circuit board are perpendicular to each other and do not intersect.
Preferably, the support structure is 4 plastic long screws, and the upper end and the lower end of each plastic long screw are provided with threads; four plastic long screws are respectively arranged on four corners of the upper layer printed circuit board and the lower layer printed circuit board, so that an intermediate air layer is formed between the upper layer printed circuit board and the lower layer printed circuit board. The air layer can improve the impedance matching of the antenna port and improve the antenna gain.
Other alternatives, such as air layers, where each part or some part may achieve the same purpose may also be replaced with foam sheets.
A single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed is provided, which comprises an upper layer printed circuit board, an intermediate air layer and a lower layer printed circuit board.
The upper surface of the upper layer printed circuit board is provided with a square patch metal layer, and the side length is 7.2mm; the lower surface of the upper layer printed circuit board is provided with a square annular patch metal layer, the outer side length is 15.0mm, and the inner side length is 8.0mm.
The upper surface of the lower layer printed circuit board is provided with a metal layer, 2 strip gaps are etched on the metal layer, the 2 strip gaps are respectively a low-frequency feed gap a and a high-frequency feed gap b, the lengths are respectively 10.2mm and 7.2mm, and the widths are 0.5mm. The lower surface of the lower layer printed circuit board is provided with a feed network consisting of branch transmission lines, the two branches are respectively a low-frequency feed branch c and a high-frequency feed branch d, the lengths of the two branches are respectively 8.3mm and 22.1mm, the width of the two branches is 1.0mm, and the high-frequency feed branch is longer than the low-frequency feed branch. One end of the low-frequency feed branch is connected to the port by a transmission line, and the other end of the low-frequency feed branch is connected with the low-frequency feed gap in an electromagnetic coupling way; one end of the high-frequency feed branch is connected to the port by a transmission line, and the other end of the high-frequency feed branch is connected with the high-frequency feed slot in an electromagnetic coupling mode.
The air layer is positioned between the upper layer printed circuit board and the lower layer printed circuit board, and the thickness is 1.0mm; the upper layer printed circuit board and the lower layer printed circuit board are made of FR4 material with the thickness of 0.508mm, and the side length is 50.0mm.
The bandwidths of the single-port double-frequency double-circular polarization filter antenna based on the transmission line feed are 5.80GHz-6.10GHz and 9.20GHz-9.64GHz, and detailed data are shown in figure 4; graph a in fig. 4 shows a pattern with a frequency of 5.91ghz, phi=0°; b graph shows a pattern with a frequency of 5.91ghz, phi=90°; graph c shows a pattern with a frequency of 9.66ghz, phi=0°; d-chart shows a pattern with a frequency of 9.66ghz, phi=90°. The low frequency axial ratio bandwidth of the antenna is 40MHz, and the axial ratio bandwidth of the high frequency is 9.55-9.73GHz. The gain of the antenna is greater than 6.7dBic in the operating band, see fig. 5 for details. The gain of the antenna is relatively stable in the working frequency band, the out-of-band gain of the low frequency band is rapidly reduced to-9 dBic, and good filtering characteristics are shown. The cross polarization is greater than 18dB at 5.91GHz and greater than 25dB at 9.66GHz, see FIG. 6 for details.
In one embodiment, a communication device is provided, including a single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feeding in any of the embodiments described above.
Specifically, the single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed can adjust the size of a related structure according to requirements, so that the antenna is suitable for wireless communication equipment with different frequency bands. The communication device in the present application may be a transmitting device, a receiving device or a transmitting and receiving device, and may be, for example, a base station or the like. Further, depending on the application scenario and the implementation function, the communication device may further include a corresponding signal processing circuit, such as a filtering circuit, a power amplifying circuit, and the like.
The filter characteristic of the method is particularly suitable for being used in a wide and complex communication scene. Meanwhile, the communication equipment formed by the invention is beneficial to the integration of the filtering characteristic and the radiation characteristic, and is also suitable for the integration and the integration of wireless mobile communication.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
While the foregoing is directed to embodiments, aspects and advantages of the present invention, other and further details of the invention may be had by the foregoing description, it will be understood that the foregoing embodiments are merely exemplary of the invention, and that any changes, substitutions, alterations, etc. which may be made herein without departing from the spirit and principles of the invention.
Claims (5)
1. A single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed is characterized in that the filter antenna comprises: the upper layer printed circuit board and the lower layer printed circuit board are provided with a supporting structure therebetween, so that an intermediate air layer is formed between the upper layer printed circuit board and the lower layer printed circuit board;
the upper surface of the upper layer printed circuit board is provided with a square patch metal layer, the lower surface of the upper layer printed circuit board is provided with a square annular patch metal layer, wherein the square patch metal layer on the upper surface is used as a high-frequency radiator of the antenna, and the square annular patch metal layer on the lower surface is used as a low-frequency radiator of the antenna; the square patch metal layer is of a square structure, and a group of diagonal corner cuts of the square patch metal layer; the square annular patch metal layer is of a square annular structure, and a group of outer diagonal corners of the square annular patch metal layer are cut;
the upper surface of the lower layer printed circuit board is provided with a metal layer, and the lower surface is provided with a feed network with two branch microstrip transmission lines; the metal layer is etched with two strip gaps, namely a low-frequency feed gap and a high-frequency feed gap, which are mutually perpendicular and are not intersected; the two branch microstrip transmission lines of the feed network are respectively a low-frequency feed branch and a high-frequency feed branch, and the length of the low-frequency feed branch is shorter than that of the high-frequency feed branch; one end of the low-frequency feed branch is connected with a port of the antenna by adopting a microstrip transmission line, and the other end of the low-frequency feed branch is connected with the low-frequency feed slot in an electromagnetic coupling way; one end of the high-frequency feed branch is connected with a port of the antenna by adopting a microstrip transmission line, and the other end of the high-frequency feed branch is connected with the high-frequency feed slot in an electromagnetic coupling way; when the low-frequency patch is fed, the high-frequency feeder serves as a low-frequency filtering branch, and when the high-frequency patch is fed, the low-frequency feeder serves as a high-frequency filtering branch.
2. The single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed as claimed in claim 1, wherein the support structure is 4 plastic long screws, and both the upper end and the lower end of each plastic long screw are provided with threads; four plastic long screws are respectively arranged on four corners of the upper layer printed circuit board and the lower layer printed circuit board, so that an intermediate air layer is formed between the upper layer printed circuit board and the lower layer printed circuit board.
3. The single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feed of claim 1, wherein the annular space of the square annular patch metal layer is larger than that of the square annular patch metal layer, and the square annular patch metal layer is arranged at a central position point corresponding to the annular space of the square annular patch metal layer in the process of arranging the square annular patch metal layer and the square annular patch metal layer on the upper printed circuit board, and the chamfer of the square annular patch metal layer are positioned in the same direction.
4. The single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed according to claim 1, wherein the length of the low-frequency feed slot is shorter than that of the high-frequency feed slot, i.e. the length of the low-frequency feed slot is 10.0 mm-10.5 mm, and the slot width is 0.3 mm-0.6 mm; the length of the high-frequency feed gap is 7.0 mm-7.5 mm, and the width of the gap is 0.3 mm-0.6 mm.
5. A wireless communication device comprising a single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feeding as claimed in any one of claims 1-4.
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| CN114552220A (en) | 2022-05-27 |
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