CN114552220A - Single-port double-frequency double-circular polarization filtering antenna based on microstrip transmission line feed and wireless communication equipment - Google Patents
Single-port double-frequency double-circular polarization filtering antenna based on microstrip transmission line feed and wireless communication equipment Download PDFInfo
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- CN114552220A CN114552220A CN202210227466.XA CN202210227466A CN114552220A CN 114552220 A CN114552220 A CN 114552220A CN 202210227466 A CN202210227466 A CN 202210227466A CN 114552220 A CN114552220 A CN 114552220A
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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 particularly relates to a single-port double-frequency double-circularly polarized filter antenna based on microstrip transmission line feed and wireless communication equipment, which comprise: the upper layer printed circuit board and the lower layer printed circuit board are provided with a supporting structure, 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 printed circuit board is provided with a metal layer, and the lower surface of the lower printed circuit board 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-circularly-polarized 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 an antenna with a shared aperture and dual-frequency characteristic is used, the size and cost of the antenna are greatly reduced; the circularly polarized antenna can receive incoming waves of any linear polarization, and meanwhile, the electromagnetic waves radiated by the circularly polarized antenna can be received by any linearly polarized antenna, so that the relative installation posture between the transmitting antenna and the receiving antenna is not limited by the torsion angle of the circularly polarized antenna, and the receiving and transmitting antenna is convenient to install. For example, in vehicle-mounted satellite communication, in the process of accurately aligning a receiver in a vehicle, since the linear polarization antenna can only receive information transmitted by the linear polarization antenna, it is extremely difficult to receive information transmitted by other antennas, but since the circular polarization antenna can receive information transmitted by any other linear polarization antenna, the research on the single-port-fed shared-aperture dual-frequency dual-circular polarization antenna has a high practical application value.
The existing 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 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 defects of large volume, complex design and high design cost; 3) the dual-frequency characteristic antenna adopts a coaxial feeding mode, which is not beneficial to large-scale antenna array design.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a single-port double-frequency double-circularly polarized filter antenna based on microstrip transmission line feed, which comprises: the upper layer printed circuit board and the lower layer printed circuit board are provided with a supporting structure, 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 printed circuit board is provided with a square patch metal layer, the lower surface of the upper printed circuit board is provided with a square annular patch metal layer, 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 printed circuit board is provided with a metal layer, and the lower surface of the lower printed circuit board 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; 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 the 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 gap 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 in an electromagnetic coupling way.
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 printed circuit board and the lower printed circuit board, so that an intermediate air layer is formed between the upper printed circuit board and the lower printed circuit board.
Preferably, the square patch metal layer is of a square structure, and a group of diagonal corner cuts of the square patch metal layer are formed; the square ring patch metal layer is of a square ring structure, and a group of outer diagonal corner cuts of the square ring patch metal layer are formed.
Further, the annular space of square annular paster metal level is bigger than square annular paster metal level, sets up square paster metal level and square annular paster metal level at upper printed circuit board in-process, sets up square paster metal level on the central point that corresponds with the annular space of square annular paster metal level, and the corner cut of square paster metal level and the corner cut of square annular paster metal level 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.
Furthermore, the length of the low-frequency feed gap is shorter than that of the high-frequency feed gap, namely the length of the low-frequency feed gap is 10.0-10.5 mm, and the width of the gap is 0.3-0.6 mm; the length of the high-frequency feed gap is 7.0-7.5 mm, and the width of the gap is 0.3-0.6 mm.
Preferably, the low-frequency feed branch in the feed network is shorter in length than the high-frequency feed branch.
A wireless communication device comprising the microstrip transmission line feed-based single-port dual-band dual-circularly polarized filter antenna 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-low frequency radiating units share the same printed circuit board, when the low-frequency patch is fed, the high-frequency feeder line is used as a low-frequency filtering branch, and when the high-frequency patch is fed, the low-frequency feeder line is used 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-band dual-circularly polarized filter antenna based on microstrip transmission line feeding according to the present invention;
FIG. 2 is a bottom view of a microstrip transmission line feed-based single-port dual-band dual-circularly polarized filter antenna according to the present invention;
FIG. 3 is a side view of a single-port dual-band dual-circularly polarized filter antenna based on microstrip transmission line feeding according to the present invention;
FIG. 4 is a comparison diagram of simulation and test S parameters of the single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feeding of the present invention;
FIG. 5 is a comparison graph of gain versus axial ratio for a single-port dual-band dual-circularly polarized filter antenna based on microstrip transmission line feeding in accordance with the present invention;
fig. 6 is a single-port dual-frequency dual-circularly polarized filter antenna directional diagram based on microstrip transmission line feeding of the invention.
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, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention designs a single-port double-circular polarization filter antenna based on transmission line feed, which is applied to satellite communication, in order to overcome the problems of poor isolation, large volume, complex design and high design cost among antenna ports in the conventional double-frequency characteristic antenna. The antenna adopts the 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 5.80 GHz-6.10 GHz and 9.20 GHz-10.64 GHz. The antenna has a good filtering function and can effectively realize the isolation between the 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-band dual-circularly polarized filter antenna based on microstrip transmission line feeding, as shown in fig. 1 to 3, the filter antenna includes: 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 utility model provides a two circular polarization filter antenna's of single port dual-frenquency embodiment based on microstrip transmission line feed, the upper surface of the upper printed circuit board of this filter antenna is provided with square paster metal level, and the lower surface is provided with square annular paster metal level, and wherein the square paster metal level of upper surface is as the high frequency radiator of antenna, and the square annular paster metal level of lower surface is as the low frequency radiator of antenna.
Optionally, the antenna low-frequency radiator is a square ring patch metal layer, the metal-free part in the center of the square ring patch metal layer is a square, and the square of the metal-free part in the center of the square ring patch metal layer is larger than the area of the antenna high-frequency radiator. Specifically, the square patch metal layer is of a square structure, and a group of diagonal corner cuts of the square patch metal layer are formed; the square ring patch metal layer is of a square ring structure, and a group of outer diagonal corner cuts of the square ring patch metal layer are formed. The annular space of square annular paster metal level is bigger than square paster metal level, sets up square paster metal level and square annular paster metal level at upper printed circuit board in-process, sets up square paster metal level on the central point that corresponds with the annular space of square annular paster metal level, and the corner cut of square paster metal level and the corner cut of square annular paster metal level are located same direction.
The square patch metal layer on the upper surface of the upper printed circuit board is used as an antenna high-frequency radiator, and the diagonal corner of the high-frequency radiator is cut, so that left-hand circularly polarized waves are radiated. The square ring patch metal layer on the lower surface of the upper printed circuit board is used as an antenna low-frequency radiator and a diagonal corner cut of the antenna low-frequency radiator, so that right-hand circular 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, meanwhile, 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 concretely comprises a metal layer arranged on the upper surface of a lower printed circuit board of the filter antenna, and a feed network with two branch microstrip transmission lines arranged on the lower surface; the metal layer is etched with two strip gaps, namely a low-frequency feed gap and a high-frequency feed gap; 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 the 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 gap 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 in an electromagnetic coupling way.
The upper surface of the lower layer printed circuit board is provided with a metal layer 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 slot a and the high frequency feed slot b are perpendicular to each other but do not intersect.
The low-frequency feed gap is in electromagnetic coupling connection with the antenna low-frequency radiator, and right-hand circularly polarized electromagnetic waves are radiated to the space by the fed electromagnetic energy through the antenna low-frequency radiator to obtain a low-frequency working frequency band; the high-frequency feed gap is in electromagnetic coupling connection with the antenna high-frequency radiator, and the fed-in electromagnetic energy is radiated to the space by the antenna high-frequency radiator to obtain a high-frequency working frequency band; 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 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 branch is used as a low-frequency filter branch to present a high-impedance characteristic, and similarly, when the high-frequency radiator is fed, the low-frequency feed branch is used as a high-frequency filter branch to present a high-impedance characteristic, so that the antenna has a good filtering function; in addition, the design method expands the impedance bandwidth of the antenna.
Optionally, the low frequency feed slot and the high frequency feed slot on 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 printed circuit board and the lower printed circuit board, so that an intermediate air layer is formed between the upper printed circuit board and the lower printed circuit board. The air layer can improve the impedance matching of the antenna port and improve the antenna gain.
Other alternatives, such as a layer of air, where each part or a part can serve the same purpose, may also be replaced by a foam board.
A single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed concretely comprises an upper layer printed circuit board, a middle 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 7.2 mm; the lower surface of the upper 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 8.0 mm.
The upper surface of lower floor's printed circuit board has the metal level, the sculpture has 2 strip gaps on the metal level, and 2 strip gaps are low frequency feed gap a, high frequency feed gap b respectively, and length is 10.2mm and 7.2mm respectively, and the width is 0.5 mm. The lower surface of the lower 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 8.3mm and 22.1mm respectively, 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 through a transmission line, and the other end of the low-frequency feed branch is in electromagnetic coupling connection with the low-frequency feed gap; one end of the high-frequency feed branch is connected to the port through a transmission line, and the other end of the high-frequency feed branch is in electromagnetic coupling connection with the high-frequency feed gap.
The air layer is positioned between the upper layer printed circuit board and the lower layer printed circuit board, and the thickness of the air layer is 1.0 mm; the upper layer printed circuit board and the lower layer printed circuit board are both made of FR4 material with the thickness of 0.508mm, and the side length is 50.0 mm.
The bandwidth of the single-port double-frequency double-circular polarization filter antenna based on transmission line feed is 5.80 GHz-6.10 GHz and 9.20 GHz-9.64 GHz, and detailed data are shown in FIG. 4; the graph a in fig. 4 represents the pattern with a frequency of 5.91GHz, phi 0 °; b represents a directional diagram with the frequency of 5.91GHz and phi of 90 degrees; c represents the pattern with frequency of 9.66GHz, phi 0 °; the d-diagram shows the pattern at 9.66GHz, phi 90 °. The low-frequency axial ratio bandwidth of the antenna is 40MHz, and the high-frequency axial ratio bandwidth is 9.55-9.73 GHz. The gain of the antenna is greater than 6.7dBic in the operating band, see figure 5 for detailed data. The gain of the antenna is relatively stable in the working frequency band, the out-of-band gain of the low frequency is rapidly reduced to-9 dBi, and good filtering characteristics are shown. The cross polarization is greater than 18dB at 5.91GHz and greater than 25dB at 9.66GHz, see figure 6 for detailed data.
In one embodiment, a communication device is provided, which includes the microstrip transmission line feed-based single-port dual-band dual-circularly polarized filter antenna in any of the above embodiments.
Specifically, the single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feeding 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 this application may be a transmitting device, a receiving device, or a transceiving device, for example, may be a base station. Further, the communication device may further include a corresponding signal processing circuit, such as a filter circuit, a power amplification circuit, etc., according to different application scenarios and implementation functions.
Due to the filtering characteristic of the application, the method is particularly suitable for being used in wide and complex communication scenes. Meanwhile, the communication equipment formed by the invention is also suitable for integration of wireless mobile communication due to the integration of the filtering characteristic and the radiation characteristic.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments, which further illustrate the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A single-port double-frequency double-circular polarization filter antenna based on microstrip transmission line feed is characterized by comprising: the upper layer printed circuit board and the lower layer printed circuit board are provided with a supporting structure, 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 printed circuit board is provided with a square patch metal layer, the lower surface of the upper printed circuit board is provided with a square annular patch metal layer, 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 printed circuit board is provided with a metal layer, and the lower surface of the lower printed circuit board 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; 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 the 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 gap 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 in an electromagnetic coupling way.
2. The single-port double-frequency double-circularly polarized filter antenna based on microstrip transmission line feed as claimed in claim 1, wherein the support structure is 4 plastic long screws, and the upper and lower ends of the plastic long screws are provided with threads; four plastic long screws are respectively arranged on four corners of the upper printed circuit board and the lower printed circuit board, so that an intermediate air layer is formed between the upper printed circuit board and the lower printed circuit board.
3. The single-port double-frequency double-circularly polarized filter antenna based on microstrip transmission line feed as claimed in claim 1, wherein the square patch metal layer is a square structure, and a set of diagonal corner cuts of the square patch metal layer; the square ring patch metal layer is of a square ring structure, and a group of outer diagonal corner cuts of the square ring patch metal layer are formed.
4. The single-port dual-band dual-circular polarized filter antenna based on microstrip transmission line feed according to claim 3, wherein the square-ring patch metal layer has a larger annular space than the square-ring patch metal layer, and the square-ring patch metal layer is disposed at a central position point corresponding to the annular space of the square-ring patch metal layer in the process of disposing the square-ring patch metal layer and the square-ring patch metal layer on the upper printed circuit board, and the corner cut of the square-ring patch metal layer is in the same direction as the corner cut of the square-ring patch metal layer.
5. The single-port dual-frequency dual-circularly polarized filter antenna based on microstrip transmission line feed as claimed in claim 1, wherein the low frequency feed slot and the high frequency feed slot on the metal layer on the upper surface of the lower printed circuit board are perpendicular to each other and do not intersect.
6. The single-port double-frequency double-circularly polarized filter antenna based on the microstrip transmission line feed is characterized in that the length of the low-frequency feed gap is shorter than that of the high-frequency feed gap, namely the length of the low-frequency feed gap is 10.0 mm-10.5 mm, and the width of the gap is 0.3 mm-0.6 mm; the length of the high-frequency feed gap is 7.0-7.5 mm, and the width of the gap is 0.3-0.6 mm.
7. The single-port double-frequency double-circularly polarized filter antenna based on microstrip transmission line feed according to claim 1, wherein the length of the low-frequency feed stub in the feed network is shorter than that of the high-frequency feed stub.
8. A wireless communication device comprising a single-port dual-band dual-circularly polarized filter antenna based on a microstrip transmission line feed as claimed in any one of claims 1 to 7.
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