CN109378580B - Dual-frequency circularly polarized monopole antenna with wide axial ratio bandwidth - Google Patents
Dual-frequency circularly polarized monopole antenna with wide axial ratio bandwidth Download PDFInfo
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- CN109378580B CN109378580B CN201811285335.7A CN201811285335A CN109378580B CN 109378580 B CN109378580 B CN 109378580B CN 201811285335 A CN201811285335 A CN 201811285335A CN 109378580 B CN109378580 B CN 109378580B
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- metal floor
- monopole antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- 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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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Abstract
The invention discloses a dual-frequency circularly polarized monopole antenna with a wide axial ratio bandwidth, which can be used for Global Navigation Satellite Systems (GNSS) and mobile communication. The metal floor board is composed of three parts, namely a radiator, a dielectric substrate and a metal floor board, wherein the radiator is composed of a high-frequency radiation unit and a low-frequency radiation unit, is attached to the upper surface of the middle dielectric substrate, and feeds power to the radiator through a microstrip line; the metal floor is positioned on the lower surface of the middle medium substrate, the shape of the metal floor is an isosceles right triangle, the arrangement and excitation of the double-frequency monopole are asymmetric relative to the metal floor connected with the ground, and the hypotenuse ground planes of the monopole antenna and the metal floor respectively generate two orthogonal electric field vectors with equal amplitude and 90-degree phase difference in high and low frequency bands, so that a right-hand circularly polarized (RHCP) signal is realized. The antenna of the present invention has a wider bandwidth in both the lower and higher frequency bands than previous antennas.
Description
Technical Field
The invention relates to the field of antenna research in the field of wireless mobile communication, in particular to a dual-frequency circularly polarized monopole antenna with a wide axial ratio bandwidth.
Background
The circularly polarized antenna has strong flexibility for transmitting and receiving signals, and can reduce the influence of multipath effect on wireless signal transmission, such as in a Global Navigation Satellite System (GNSS) and a Wireless Local Area Network (WLAN). The dual-band circularly polarized antenna can realize circularly polarized radiation in two or even a plurality of frequency bands simultaneously, and meets the requirements of various communication systems, thereby being widely concerned by academia.
Researchers have proposed many different types of dual-band circularly polarized antennas. Mainly based on the forms of slits, patches, dipoles and the like, but the defects of narrow bandwidth and large volume are generally existed. But designs for achieving dual-frequency circular polarization based on monopole structures are still relatively few. The monopole antenna has the advantages of compact structure, wide bandwidth and the like, so that the application of the dual-frequency circularly polarized monopole antenna has important significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a dual-frequency circularly polarized monopole antenna with a wide axial ratio bandwidth.
The purpose of the invention is realized by the following technical scheme: a dual-frequency circular polarization monopole antenna with a wide axial ratio bandwidth is composed of a radiator, a dielectric substrate and a metal floor, wherein the radiator is composed of a high-frequency radiation unit and a low-frequency radiation unit, is attached to the upper surface of the middle dielectric substrate and feeds power to the radiator through a microstrip line; the metal floor is positioned on the lower surface of the middle medium substrate, the shape of the metal floor is an isosceles right triangle, the arrangement and excitation of the double-frequency monopole are asymmetric relative to the metal floor connected with the ground, and two orthogonal electric field vectors with equal amplitude and 900 phase difference are respectively generated by the monopole antenna and the bevel edge ground plane of the metal floor in high and low frequency bands, so that a right-hand circularly polarized (RHCP) signal is realized.
Preferably, the high-frequency radiating unit has an L-shaped structure. Operating at higher frequency band resonances, are mainly used for mobile communications.
Preferably, the low-frequency radiating unit is a rectangular radiating unit, and the rectangular radiating unit adopts a snake-shaped folded microstrip line structure. To achieve a compact structure, mainly working at low band resonance, mainly for global navigation satellite systems,
preferably, the dielectric substrate is a Rogers4360G2 dielectric substrate.
Preferably, the monopole antenna has an operating bandwidth of 1.05 to 1.75GHz at a low frequency band for GNSS use and an operating bandwidth of 2.27 to 3.28GHz at a high frequency band for mobile communication.
Compared with the prior art, the invention has the following beneficial effects:
1. the dual-frequency circularly polarized monopole antenna with the wide axial ratio bandwidth has two working frequency ranges of 1.05-1.75GHz and 2.27-3.28GHz, and can be used for GNSS and mobile communication respectively.
2. The dual-frequency circularly polarized monopole antenna with the wide axial ratio bandwidth can radiate right-hand circularly polarized waves in two frequency band ranges of high and low.
3. The dual-frequency circularly polarized monopole antenna with the wide axial ratio bandwidth is simple and compact in structure, and can realize the circularly polarized function without additional phase shifters, power dividers and other devices.
4. The dual-frequency circularly polarized monopole antenna with the wide axial ratio bandwidth has very wide axial ratio bandwidth in two working frequency bands.
Drawings
Fig. 1 is an overall configuration diagram of the antenna of the present embodiment.
Fig. 2 is an exploded view of the structure of the antenna of the present embodiment.
Fig. 3(a) is a plan view of the antenna of the present embodiment.
Fig. 3(b) is a bottom view of the antenna of the present embodiment.
Fig. 4(a) is a graph showing the result of the reflection coefficient S11 simulated and measured by the antenna of the present embodiment.
Fig. 4(b) is a graph showing the results of simulation and measurement of the axial ratio AR of the antenna of the present embodiment.
Fig. 5 shows the main polarization and cross polarization results of the antenna of this embodiment simulated and measured at the frequency point of 1.575GHz, where (a) phi is 0 °; (b) phi is 90 deg..
Fig. 6 shows the main polarization and cross polarization results of the antenna of the present embodiment simulated and measured at the frequency point of 2.45GHz, where (a) phi is 0 °; (b) phi is 90 deg..
Fig. 7 is a graph showing the results of the simulation and measurement of the antenna of the present embodiment.
Fig. 8 is a graph showing the results of the antenna simulation and measurement of the axial gain in the present embodiment.
In the figure: 1-high frequency radiation unit, 2-low frequency radiation unit, 3-microstrip line, 4-dielectric substrate, 5-metal floor.
Detailed Description
Technical details of the present invention will be described in detail below with reference to the accompanying drawings in which embodiments of the present invention are shown, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments of the present invention without creative efforts, are within the scope of the present invention.
The dual-frequency circularly polarized monopole antenna with the aspect ratio bandwidth is described in this embodiment. See fig. 1-3. The antenna is composed of three parts of a radiator, a dielectric substrate 4 and a floor 5. The radiator is composed of a high-frequency radiation unit 1 and a low-frequency radiation unit 2, and is attached to the upper surface of an intermediate dielectric substrate 4. The high-frequency radiating unit 1 is an L-shaped branch and is mainly used for high frequency bands, the low-frequency radiating unit 2 is a rectangular radiating unit and adopts a snake-shaped folding structure to realize a compact structure and is mainly used for low frequency bands; the radiator is fed through the microstrip line 3, and the characteristic impedance of the microstrip line is 50 Ω.
The metal floor 5 is located on the lower surface of the intermediate medium substrate 4, and is in the shape of an isosceles right triangle metal plate. The monopole excitation is asymmetric with respect to the ground plane, and the monopole and hypotenuse ground planes can generate two orthogonal electric field vectors with equal amplitude phase difference of 90 °, achieving Right Hand Circularly Polarized (RHCP) signals. The dielectric substrate used was Rogers4360G 2. The overall dimensions of the circuit were 105mm by 105 mm.
See fig. 4(a), 4 (b). Fig. 4(a) shows the simulated and actually measured impedance bandwidth (S11< -10dB, IMBW) of the antenna. The impedance bandwidths were from 1.04GHz to 3.11GHz (2.07GHz, 99.8%) and from 1.14 to 3.20GHz (2.06GHz, 94.9%), and fig. 4(b) shows the axial ratio bandwidths (AR <3dB, ARBW) of the lower band and the higher band, simulated and actually measured. The low band was from 1.10GHz to 1.73GHz (0.63GHz, 44.5%), the high band was from 2.05 to 3.07GHz (1.02GHz, 39.8%), and the lower and higher band ARBW was measured from 1.05 to 1.75GHz (0.7GHz, 50.0%) and from 2.27 to 3.28GHz (1.01GHz, 36.4%). Thus, the measured operating bandwidth (S11< -10dB, AR <3dB) is from 1.05 to 1.75GHz (0.7GHz, 50.0%) for GNSS usage, and 2.27 to 3.28GHz (1.01GHz, 36.4%) for mobile communications.
Referring to fig. 5 and 6, simulation results and measurement results of radiation patterns of the antenna at 1.575GHz and 2.45GHz are shown respectively. It can be seen that the measurements coincide with the simulation. It should be noted that the main polarization is right-hand circular polarization and the cross polarization is left-hand circular polarization. It can be seen that the radiation pattern of the main polarization has poles in the positive X-direction and zeros in the negative X-direction. The cross-polarized radiation pattern has a zero in the positive X-direction and a pole in the negative X-direction. The main polarization is clockwise and the cross polarization is counterclockwise.
Referring to fig. 7 and 8, the simulated and measured efficiency and axial gain of the antenna are shown, respectively. In the simulation results presented in FIG. 7, the efficiency ranges from 87.2% to 100% at the lower operating band of 1.10-1.73GHz and from 89.8% to 98.4% at the upper operating band of 2.05-3.07 GHz. In the results of the actual measurements presented in FIG. 7, the efficiency ranged from 58.7% to 92.9% at the lower operating band of 1.10-1.73GHz and from 81.4% to 92.6% at the upper operating band of 2.05-3.07 GHz. The simulation results presented in fig. 8 show that the main polarization axial gain ranges from 0.3 to 2.2dBi in the low frequency band and from 0 to 2.9dBi in the high frequency band. The measurements presented in FIG. 8 show that the main polarization axial gain ranges from-0.2 to 2.3dBi at low band and from-3.2 to 2.5dBi at high band. The cross-polarization simulation analysis and the actual measured axial gain range were below-10 dBi in both operating bands.
The above is a detailed description of the dual-band circularly polarized monopole antenna with a wide axial ratio and a wide bandwidth of the present invention. The present invention has been described in terms of design, principles, and implementations using specific embodiments to facilitate understanding of the invention and its core concepts. In summary, the present invention is only a preferred embodiment, and is not intended to limit the present invention, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A dual-frequency circular polarization monopole antenna with a wide axial ratio bandwidth is characterized by comprising a radiator, a dielectric substrate and a metal floor, wherein the radiator comprises a high-frequency radiation unit and a low-frequency radiation unit, is attached to the upper surface of the middle dielectric substrate and feeds power to the radiator through a microstrip line;the metal floor is positioned on the lower surface of the middle medium substrate and is in the shape of an isosceles right triangle, the connecting point of the microstrip line and the radiator deviates from the middle point of the hypotenuse of the isosceles right triangle, and the hypotenuse of the monopole antenna and the metal floor are respectively generated in two frequency bands of high and low, the two frequency bands are equal in amplitude and 90 DEG in size0Two orthogonal electric field vectors of the phase difference realize the right-hand circularly polarized signal; the high-frequency radiating unit is of an L-shaped structure, the low-frequency radiating unit is a rectangular radiating unit, and the rectangular radiating unit is of a snake-shaped folded microstrip line structure.
2. The dual-frequency circularly polarized monopole antenna with the aspect ratio bandwidth as claimed in claim 1, wherein the dielectric substrate is a Rogers4360G2 dielectric substrate.
3. The dual-band circularly polarized monopole antenna with the wide axial ratio bandwidth as claimed in claim 1, wherein the monopole antenna has an operating bandwidth of 1.05 to 1.75GHz at a low frequency band for GNSS use and an operating bandwidth of 2.27 to 3.28GHz at a high frequency band for mobile communication.
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| CN201811285335.7A CN109378580B (en) | 2018-10-31 | 2018-10-31 | Dual-frequency circularly polarized monopole antenna with wide axial ratio bandwidth |
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| CN201811285335.7A CN109378580B (en) | 2018-10-31 | 2018-10-31 | Dual-frequency circularly polarized monopole antenna with wide axial ratio bandwidth |
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| CN109378580A CN109378580A (en) | 2019-02-22 |
| CN109378580B true CN109378580B (en) | 2020-08-18 |
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| CN114361784B (en) * | 2022-01-12 | 2022-10-28 | 西安电子科技大学 | Broadband compact circular polarized antenna based on common mode differential mode |
| CN115275615B (en) * | 2022-06-08 | 2023-07-25 | 安徽师范大学 | Dual-band circularly polarized antenna for Beidou and GPS |
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| US8279125B2 (en) * | 2009-12-21 | 2012-10-02 | Symbol Technologies, Inc. | Compact circular polarized monopole and slot UHF RFID antenna systems and methods |
| CN105406186B (en) * | 2015-12-15 | 2018-06-22 | 华南理工大学 | Broadband Circular Polarization Microstrip Antenna with low axis ratio characteristic |
| CN106816701A (en) * | 2017-01-16 | 2017-06-09 | 西安电子科技大学 | Double frequency round polarized microstrip antenna |
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