CN111342221A - Low-profile ultra-wideband oscillator antenna based on concave corrugated ground structure - Google Patents
Low-profile ultra-wideband oscillator antenna based on concave corrugated ground structure Download PDFInfo
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- CN111342221A CN111342221A CN202010088855.XA CN202010088855A CN111342221A CN 111342221 A CN111342221 A CN 111342221A CN 202010088855 A CN202010088855 A CN 202010088855A CN 111342221 A CN111342221 A CN 111342221A
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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
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
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Abstract
The invention provides a low-profile ultra-wideband element antenna based on a concave corrugated ground structure, which comprises: the antenna comprises a printed plane butterfly oscillator antenna, a quarter-arc parallel double-line transmission line, a double-folded parallel double-line transmission line, an index gradual change microstrip balun, an SMA connector and a concave folded ground structure. The antenna is connected to a microstrip balun through an SMA connector, transits from an unbalanced mode to a balanced mode, then transits from horizontal transmission to vertical transmission through a double-fold-shaped and quarter-arc parallel double-wire transmission line, and excites the planar bowtie oscillator antenna to radiate. The plane butterfly-shaped oscillator antenna is fixed on the concave corrugated ground structure through a nylon stud. The concave fold ground structure consists of a plurality of gradually-changed slotted grooves and a concave cavity. The invention solves the problems of low profile and ultra wide band stable directional radiation of the existing ultra wide band antenna with the floor.
Description
Technical Field
The invention relates to the field of antennas, in particular to a low-profile ultra-wideband element antenna based on a concave corrugated ground structure.
Background
The continuous progress of scientific technology and the increasing demand of society in various aspects push the rapid development of wireless communication technology, and antennas as important components in wireless communication systems are receiving more attention. Communication equipment is also indispensable on various carriers such as satellites, automobiles, ships and the like, and the requirements on antennas are more and more strict.
With the development of communication technology, the ultra-wideband communication technology has received more and more attention in the industry due to its advantages of strong frequency division multiplexing capability, high transmission rate, low system complexity, strong anti-multipath transmission capability, low cost, etc. In order to increase transmission distance and enhance anti-interference capability and transplant the antenna to each platform, the ultra-wideband directional conformal antenna is becoming a research hotspot.
Common ultra-wideband antennas, such as helical antennas, log-periodic antennas, etc., have a wide impedance bandwidth, but when they are conformal on a metal structure, the pattern cannot be kept stable over a wide frequency band. In order to prevent the directional diagram from being distorted, a wave-absorbing material is added between the antenna and the conformal floor to absorb electromagnetic waves in the conventional method, however, the method can cause at least half of energy loss and reduce the gain of the ultra-wideband antenna.
In recent years, stable directional radiation smaller than 3 frequency multiplication and good impedance matching can be realized under the condition of a lower section by adopting an artificial magnetic conductor, a high-impedance surface, a simple cavity structure and a rough structure, when the bandwidth is increased to exceed 5 frequency multiplication, the traditional floor structure cannot be effective, and the research on the ultra-wideband directional antenna with a novel reflector is needed.
The invention patent with application number 201811022637.5 discloses an ultra wide band dual-polarized element antenna, and the method comprises the following steps of firstly, establishing a space rectangular coordinate system; constructing an ultra-wideband PCB (printed circuit board) symmetrical vibrator; constructing an ultra-wideband microstrip feed balun; step four, constructing an orthogonal polarization crossed vibrator; step five, arranging a metal floor; feeding power by using a double coaxial cable; the antenna has ultra-wideband, dual polarization, high gain, high efficiency, umbrella shape, low profile, low intermodulation, high reliability, simple structure, low cost and easy production, so that the high-frequency dual-polarized oscillator and the antenna are influenced little by the high-frequency dual-polarized oscillator when being embedded and arrayed coaxially, and a beneficial reference method is provided for the design and improvement of the multi-frequency dual-polarized oscillator antenna. But the direction of the ultra-wideband antenna application of the scheme is unstable.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a low-profile ultra-wideband element antenna based on a concave corrugated ground structure.
The invention provides a low-profile ultra-wideband element antenna based on a concave corrugated ground structure, which comprises an ultra-wideband element antenna, a feed structure plate and a concave corrugated ground structure; wherein:
the ultra-wideband oscillator antenna is arranged on the concave corrugated ground structure;
the two sides of the feed structure plate comprise a quarter-arc parallel double-line transmission line, a double-folded parallel double-line transmission line and an index gradual change microstrip balun which are sequentially connected, and the index gradual change microstrip balun is connected with an SMA connector;
the ultra-wideband element antenna realizes the feeding with the SMA connector by connecting the feeding structural plate.
Preferably, the exponentially graded microstrip balun is arranged outside the concave corrugated structure.
Preferably, the concave corrugated structure comprises a metal body, a hollow concave cavity is formed in the metal body, and a plurality of gradually-changed slotted metal groove plates are erected in the concave cavity.
Preferably, the depth of the gap of the gradually-changed slotted metal groove plate is gradually reduced from the middle part to the end part of the concave cavity.
Preferably, a central part of one side of the concave corrugated ground structure is cut off, and the feeding structure plate is vertically placed at the cut-off position.
Preferably, the feeding structure plate can be folded at the double-folded parallel two-wire transmission line.
Preferably, the ultra-wideband element antenna comprises a planar printed element antenna and widens the width and the cut angle of the metal rectangle.
Preferably, the ultra-wideband element antenna is horizontally arranged above the plurality of gradually-changed slotted metal slot plates.
Preferably, the ultra-wideband element antenna and the feed structure plate are processed by a PCB process.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention solves the problem of unstable direction diagram in the application of the existing ultra-wideband antenna with a reflector;
2. according to the invention, the low-profile ultra-wideband stable directional radiation is realized by combining the corrugated structure and the concave cavity to construct a concave corrugated ground;
3. according to the invention, by constructing the concave corrugated ground structure, the directional gain of the antenna is effectively increased, the impedance matching characteristic is improved, and the ultra-wide working bandwidth is realized;
4. the exponential gradient balun is positioned outside the concave fold, and the transverse size can be reduced by folding the feed structure plate by 90 degrees;
5. according to the invention, the metal plate is adopted to machine the concave corrugated ground, and the PCB process is adopted to machine the source antenna and the feed structure, so that the processing is convenient;
6. the invention can realize 167.9% of relative impedance bandwidth and 130.0% of stable directional radiation relative bandwidth under the height of 0.156 wavelength section;
7. the invention can realize the directional high gain of over 5 frequency multiplication, which is more than 7dB, and the peak value reaches 12 dB.
8. The antenna of the invention has regular and symmetrical shape, and the working frequency is completely determined by the size of the antenna, so the working frequency band of the antenna can be easily changed at will within the allowable range of the processing technology.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is an oblique view of a low-profile ultra-wideband element antenna based on a concave corrugated ground structure;
FIG. 2 is an ultra-wideband oscillator antenna diagram;
FIG. 3 is a structure diagram of a feed structure of a low-profile ultra-wideband element antenna;
FIG. 4 is an oblique view of the structure of a concave pleat;
FIG. 5 is a long side sectional view of a concave corrugated structure;
FIG. 6 is a short side sectional view of a concave corrugated structure
Fig. 7 is a standing wave ratio result graph of a low-profile ultra-wideband element antenna based on a concave corrugated ground structure.
Fig. 8 is a graph of the gain result of a low-profile ultra-wideband element antenna based on a concave corrugated ground structure.
Fig. 9 is an E-plane pattern of a low-profile ultra-wideband element antenna based on a concave corrugated ground structure.
The figures show that:
Concave corrugated floor structure 3
Quarter-arc parallel double-line transmission line 4
Double-fold parallel double-line transmission line 5
Exponential gradual change microstrip balun 6
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1 to 9, the low-profile ultra-wideband dipole antenna based on the concave corrugated ground structure provided by the invention comprises an ultra-wideband dipole antenna, a feed structure plate and a concave corrugated ground structure, wherein the ultra-wideband dipole antenna is a printed planar butterfly dipole antenna, the printed planar butterfly dipole antenna is mounted on the concave corrugated ground structure and is used as a source antenna, a metal antenna pattern is etched on one surface of a copper-clad dielectric plate, and all metal is removed from the other surface of the copper-clad dielectric plate. The antenna pattern is two identical metal rectangles which are aligned up and down and placed in parallel on the same plane to form a plane wide flat plate vibrator. And four corners of two sides of the two rectangles are cut to improve impedance characteristics, and two small rectangles are symmetrically added up and down in the center of the gap to enable the feed distance to be consistent with the thickness of the feed structure plate. The feed structure board and the source antenna are arranged in an orthogonal mode, the feed structure board is also corroded on two sides of the copper-coated dielectric plate to form a feed structure, the end of the parallel double-line transmission line is connected with the middle of the planar printing butterfly-shaped oscillator, and the end of the microstrip line realizes feed through the SMA connector. The feed board pattern is divided into 3 parts, and comprises a quarter-arc parallel double-line transmission line, a double-folded parallel double-line transmission line and an index gradual change microstrip balun which are connected in sequence, wherein the index gradual change microstrip balun is connected with an SMA connector; the feed structure board can be folded at the position of the double-folded parallel double-line transmission line, so that the transverse size is reduced. The source antenna realizes feed by sequentially connecting a quarter-arc parallel double-line transmission line, a double-folded parallel double-line transmission line, an index gradual change microstrip balun and an SMA connector; the quarter-arc parallel double-line transmission line can realize horizontal transmission and vertical transmission conversion; the double-fold parallel double-line transmission line extends a quarter of the arc parallel double-line transmission line and is connected with the exponential gradient microstrip balun. The double-folded parallel double-line transmission line is in a shape of a fold line with two obtuse angle turns, and the purpose of the double-folded parallel double-line transmission line is to connect the balun and a quarter arc parallel double-line transmission line, so that the impedance characteristic is improved, the balun can be positioned outside a concave folded ground structure, and the directional diagram characteristic is improved. The index gradual change microstrip balun is positioned outside the concave corrugated ground structure, the front side and the back side of the index gradual change balun are different in structure, one end of the index gradual change balun is a double line with the two sides having the same width, the other end of the index gradual change balun is a microstrip line, and the front side and the back side of the middle part of the index gradual change balun realize gradual change in an index curve form. The exponential gradual change balun can realize unbalanced and balanced conversion, and meanwhile, adopts exponential gradual change width to realize impedance transformation. The concave fold ground structure is formed by hollowing a concave cavity in a metal body, and 6 gradually-changed slotted grooves are formed in the concave cavity. One side of the long side of the concave cavity and the central part of the 4-piece slot plate close to the side are cut off for transversely placing the feed structure plate. The 6 sheets of trough plate have the same basic structure, and the depth of the slot gradually decreases from the middle to both sides until the slot is zero. The source antenna uses a concave fold ground structure as a reflector, improves the radiation pattern of the source antenna and realizes ultra-wideband stable directional radiation. And the impedance matching of the source antenna under the reflector is improved, and the ultra-wide working bandwidth is realized.
Furthermore, the source antenna adopts a planar printed oscillator antenna, and the oscillator impedance characteristic can be stabilized by widening the width and the cut angle of the metal rectangle, so that the broadband is realized. And processing the source antenna and the feed structure plate by using a PCB (printed Circuit Board) process, machining the concave corrugated ground structure by using a metal plate, welding the source antenna and the feed structure plate, and then installing the non-metal stud combination on the concave corrugated ground structure.
Fig. 7 is a comparison graph of the measured simulation of the standing wave result of the present embodiment, and it can be seen that the standing wave ratio is substantially less than 2 within 2.26 to 26GHz, and the relative bandwidth is 167.9%.
FIG. 8 is a comparison graph of the actual measurement simulation of the gain results of the present embodiment, which shows that the peak value is 12dB and is substantially greater than 7dB within 2-10.5 GHz.
Fig. 9 shows the E-plane pattern of this embodiment operating at 2-10.5GHz, and it can be seen that the pattern directivity is good in this frequency band.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A low-profile ultra-wideband element antenna based on a concave corrugated ground structure is characterized by comprising an ultra-wideband element antenna, a feed structure plate and a concave corrugated ground structure; wherein:
the ultra-wideband oscillator antenna is arranged on the concave corrugated ground structure;
the two sides of the feed structure plate comprise a quarter-arc parallel double-line transmission line, a double-folded parallel double-line transmission line and an index gradual change microstrip balun which are sequentially connected, and the index gradual change microstrip balun is connected with an SMA connector;
the ultra-wideband element antenna realizes the feeding with the SMA connector by connecting the feeding structural plate.
2. The low-profile ultra-wideband element antenna based on the concave corrugated ground structure as claimed in claim 1, wherein the exponential-gradient microstrip balun is disposed outside the concave corrugated ground structure.
3. The low-profile ultra-wideband element antenna based on the concave corrugated ground structure as claimed in claim 1, wherein the concave corrugated ground structure comprises a metal body, a hollow concave cavity is formed in the metal body, and a plurality of gradually-changed slotted metal slot plates are erected in the concave cavity.
4. The low-profile ultra-wideband element antenna based on the concave corrugated ground structure as claimed in claim 3, wherein the slot depth of the gradually-changed slotted metal slot plate is gradually reduced from the middle part to the end part of the concave cavity.
5. The low-profile ultra-wideband element antenna based on the concave corrugated ground structure as claimed in claim 1, wherein a central portion of one side of the concave corrugated ground structure is cut off, and the feeding structure plate is vertically placed at the cut-off position.
6. The low-profile ultra-wideband element antenna based on the concave corrugated ground structure as claimed in claim 1, wherein the feeding structure board can be folded at the position of the double-folded parallel two-wire transmission line.
7. The low-profile ultra-wideband element antenna based on the concave corrugated ground structure as claimed in claim 1, wherein the ultra-wideband element antenna comprises a planar printed element antenna, and the width and the cut angle of the metal rectangle are widened.
8. The low-profile ultra-wideband element antenna based on the concave corrugated ground structure as claimed in claim 3, wherein the ultra-wideband element antenna is horizontally arranged above the plurality of gradually-changed slotted metal slot plates.
9. The low-profile ultra-wideband element antenna based on the concave corrugated ground structure as claimed in claim 1, wherein the ultra-wideband element antenna and the feeding structure plate are processed by a PCB process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010088855.XA CN111342221A (en) | 2020-02-12 | 2020-02-12 | Low-profile ultra-wideband oscillator antenna based on concave corrugated ground structure |
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| CN202010088855.XA CN111342221A (en) | 2020-02-12 | 2020-02-12 | Low-profile ultra-wideband oscillator antenna based on concave corrugated ground structure |
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Citations (8)
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| CN101872895A (en) * | 2010-05-31 | 2010-10-27 | 电子科技大学 | High-gain planar wide-frequency antenna |
| CN102593585A (en) * | 2012-03-09 | 2012-07-18 | 哈尔滨工业大学（威海） | Integrated balun feed sine antenna device |
| CN103187618A (en) * | 2013-03-21 | 2013-07-03 | 西安电子科技大学 | Hollow dielectric spherical spiral antenna |
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| CN107508048A (en) * | 2017-07-10 | 2017-12-22 | 佛山市波谱达通信科技有限公司 | A kind of directional antenna arrangement |
| WO2018120197A1 (en) * | 2016-12-30 | 2018-07-05 | 华为技术有限公司 | Antenna and communication device |
| CN109860997A (en) * | 2019-03-12 | 2019-06-07 | 华南理工大学 | A kind of light-operated restructural monopole antenna of polarization |
-
2020
- 2020-02-12 CN CN202010088855.XA patent/CN111342221A/en active Pending
Patent Citations (8)
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| CN101872895A (en) * | 2010-05-31 | 2010-10-27 | 电子科技大学 | High-gain planar wide-frequency antenna |
| CN102593585A (en) * | 2012-03-09 | 2012-07-18 | 哈尔滨工业大学（威海） | Integrated balun feed sine antenna device |
| CN103187618A (en) * | 2013-03-21 | 2013-07-03 | 西安电子科技大学 | Hollow dielectric spherical spiral antenna |
| CN104682012A (en) * | 2015-03-14 | 2015-06-03 | 西安电子科技大学 | Gradient ripple loaded high-gain and low-scattering included angle reflection surface |
| CN106207495A (en) * | 2016-08-23 | 2016-12-07 | 江苏省东方世纪网络信息有限公司 | Dual polarized antenna and radiating element thereof |
| WO2018120197A1 (en) * | 2016-12-30 | 2018-07-05 | 华为技术有限公司 | Antenna and communication device |
| CN107508048A (en) * | 2017-07-10 | 2017-12-22 | 佛山市波谱达通信科技有限公司 | A kind of directional antenna arrangement |
| CN109860997A (en) * | 2019-03-12 | 2019-06-07 | 华南理工大学 | A kind of light-operated restructural monopole antenna of polarization |
Non-Patent Citations (3)
| Title |
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| QI WU等: "On the Performance of Printed Dipole Antenna With Novel Composite Corrugated-Reflectors for Low-Profile Ultrawideband Applications", 《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION ( VOLUME: 58, ISSUE: 12, DEC. 2010)》 * |
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Application publication date: 20200626 |