CN113410642A - One-to-four power division feed network of broadband antenna - Google Patents
One-to-four power division feed network of broadband antenna Download PDFInfo
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- CN113410642A CN113410642A CN202110644060.7A CN202110644060A CN113410642A CN 113410642 A CN113410642 A CN 113410642A CN 202110644060 A CN202110644060 A CN 202110644060A CN 113410642 A CN113410642 A CN 113410642A
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- 230000009466 transformation Effects 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000002955 isolation Methods 0.000 description 12
- 238000004088 simulation Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000010354 integration Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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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
- 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
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
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Abstract
The invention provides a one-to-four power division feed network of a broadband antenna, which adopts a microstrip line structure, wherein the microstrip line structure comprises a metal conduction band; the metal conduction band comprises an input port, a first output port, a second output port, a third output port, a fourth output port, power dividing lines and impedance transformation lines, one ends of the four power dividing lines are respectively connected with the input port, the four power dividing lines are sequentially arranged along the circumferential direction of the input port, the other ends of the four power dividing lines are respectively connected with the end parts of the two impedance transformation lines and form a field-shaped structure together, and the first output port, the second output port, the third output port and the fourth output port are sequentially arranged at the four corners of the field-shaped structure.
Description
Technical Field
The invention relates to the field of communication, in particular to a one-to-four power division feed network of a broadband antenna.
Background
Due to the wide application of the array antenna in a communication system, the requirement on a feed network of the array antenna is also improved at the same time. At the moment, an equal-phase and equal-amplitude power division feed network is needed, and meanwhile, the power division feed network is also required to have the characteristics of small volume, light weight, easiness in integration and the like.
The traditional equal-phase equal-amplitude power division feed network is generally realized in a cascading mode of Wilkinson power dividers without isolation resistors. However, since there is no isolation resistor, there is no isolation between the branches, and the size of the cascade is large, which is not beneficial to integration. Therefore, how to solve the problem of good feeding and reducing the volume of the array antenna is an urgent need.
Patent document 201508897U discloses an improved wilkinson power divider, which is composed of a resistor and a transmission line, wherein the transmission line includes a one-to-two connector [4], a combining port of the connector is connected with an input branch, two branch ports of the connector are respectively connected with two output main branches, and not less than 1 branch transmission line segment communicating the two output main branches is designed between the two output main branches except for an isolation resistor, but the design still does not solve the size problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a one-to-four power division feed network of a broadband antenna.
According to the one-to-four power division feed network of the broadband antenna, a microstrip line structure is adopted, and the microstrip line structure comprises a metal conduction band;
the metal conduction band comprises an input port, a first output port, a second output port, a third output port, a fourth output port, a power line and an impedance transformation line;
one end of each of the four power dividing lines is connected with the input port, the four power dividing lines are sequentially arranged along the circumferential direction of the input port, and the other ends of the four power dividing lines are connected with the end parts of the two impedance transformation lines respectively and form a Chinese character 'tian' shaped structure together;
the first output port, the second output port, the third output port and the fourth output port are sequentially arranged at four corners of the Chinese character tian-shaped structure.
Preferably, the four square-shaped structures into which the field-shaped structure is divided are all square structures.
Preferably, the microstrip line structure further comprises an intermediate dielectric layer and a metal ground;
the metal conduction band is arranged on the upper surface of the middle dielectric layer, and the metal ground is arranged on the lower surface of the middle dielectric layer.
Preferably, the input port adopts a circular microstrip line structure.
Preferably, the impedance transformation line adopts 1/4 wavelengths of a working frequency point of a feed network.
Preferably, the power distribution line adopts 1/4 wavelengths of working frequency points of a feed network.
Preferably, any two of the first output port, the second output port, the third output port and the fourth output port are all in an axisymmetric structure.
Preferably, the impedance of the impedance transformation line is 75 ohms.
Preferably, the impedance of the power line is 85 ohms.
Preferably, the first output port, the second output port, the third output port and the fourth output port all adopt 50-ohm transmission lines.
Compared with the prior art, the invention has the following beneficial effects:
1. the antenna power division feed network adopted in the invention has the advantages of compact structure, small volume, light weight, easy integration and wider bandwidth.
2. The antenna feed network adopts a field-shaped structure arrangement, directly realizes one-to-four connection, does not adopt two-stage one-to-two cascade connection, greatly reduces the size of the antenna feed network, and has the area about 60 percent of the area of the traditional one-to-four power division feed network.
3. The adjacent branches have isolation, so that the defect that the adjacent branches do not have isolation when the traditional power division feed network does not adopt isolation resistors is overcome, and the system is easy to integrate.
4. According to the invention, adjacent branches are connected through a half-wavelength line, the phase difference of signals among the branches is 180 degrees, and the amplitudes are equal, so that the adjacent branches are mutually offset to form isolation.
5. The invention adopts one-to-four direct matching, avoids the bandwidth narrowing caused by cascade connection, simultaneously, the input port adopts a circular microstrip line design, can offset the impedance discontinuity effect, effectively expands the bandwidth, and the relative bandwidth of the invention can reach more than 25 percent.
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 a schematic structural diagram of a one-to-four power division feed network of a broadband antenna according to an embodiment of the present invention;
fig. 2 is a schematic side view of a four-in-one power division feeding network of a broadband antenna according to an embodiment of the present invention;
fig. 3 is an input return loss simulation diagram of a one-to-four power division feed network of a broadband antenna according to an embodiment of the present invention;
fig. 4 is an insertion loss simulation diagram of a one-to-four power division feeding network of a broadband antenna according to an embodiment of the present invention;
fig. 5 is a simulation diagram of phases of each path of the broadband antenna one-to-four power division feeding network according to the embodiment of the present invention;
fig. 6 is a simulation diagram of the isolation of two adjacent paths of the broadband antenna one-to-four power division feed network according to the embodiment of the present invention.
The figures show that:
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.
Example 1:
the invention provides a one-to-four power division feed network of a broadband antenna, which adopts a microstrip line structure, wherein the microstrip line structure comprises a metal conduction band 8, a middle dielectric layer 9 and a metal ground 10, the metal conduction band 8 is arranged on the middle dielectric layer 9, and the metal ground 10 is arranged below the middle dielectric layer 9.
Further, the metal conduction band 8 includes an input port 1, a first output port 2, a second output port 3, a third output port 4, a fourth output port 5, power dividing lines 6 and impedance transformation lines 7, one end of each of the four power dividing lines 6 is connected to the input port 1, the four power dividing lines 6 are sequentially arranged along the circumferential direction of the input port 1, the other end of each of the four power dividing lines 6 is connected to the end portions of the two impedance transformation lines 7, the end portions of the two impedance transformation lines 7 form a field-shaped structure together, and the first output port 2, the second output port 3, the third output port 4 and the fourth output port 5 are sequentially arranged at four corners of the field-shaped structure. Any two of the first output port 2, the second output port 3, the third output port 4 and the fourth output port 5 are all in an axisymmetric structure.
Further, four power distribution lines 6 are preferably uniformly arranged along the circumferential direction of the input port 1 in sequence, and four square structures are formed by dividing the field-shaped structure.
Example 2:
the preferred embodiment is the preferred embodiment of embodiment 1.
The embodiment provides a one-to-four power division feed network of a broadband antenna, which adopts a microstrip line structure, as shown in fig. 2, the structure shown in fig. 1 is a metal conduction band 8 structure of a microstrip line, and the microstrip line structure is composed of a first output port 2, a second output port 3, a third output port 4, a fourth output port 5, a power division line 6 and an impedance transformation line 7.
The input port 1 adopts a circular strip line structure and is positioned at the center of a one-to-four power division feed network to realize signal input and broadband input impedance matching.
The first output port 2, the second output port 3, the third output port 4 and the fourth output port 5 all adopt 50 ohm transmission lines, the length of each output port can adopt any length, power division output is achieved, and the power division output is selected reasonably according to the actual product.
The power dividing line 6 is about a quarter wavelength of the working frequency point of the power divider in length, the impedance is about 85 ohms, four sections are arranged in a cross shape, and the cross point is the input port 1.
The length of the impedance transformation line 7 is 1/4 wavelengths of working frequency points of the power divider, the impedance is about 75 ohms, and the whole one-to-four power division feed network consists of eight sections of impedance transformation lines and is arranged into a 'tian' shape together with the power division lines 6. The impedance transformation line 7 is used for realizing impedance matching between each output port and the power dividing line 6 and isolation between adjacent ports.
The invention is suitable for the feeding of the array antenna with 4 array sources of bandwidth or more than 4 array elements, has the advantages of small volume, easy integration and wider bandwidth, and can be widely applied to engineering practice. Especially for miniaturized array antennas in planar form.
FIG. 3 is a graph of a standing wave simulation of the present invention. The abscissa is frequency, the unit GHz and the ordinate is an input return loss simulation result graph S11, as shown in FIG. 3, S1 is equal to or less than-10 dB and the relative bandwidth is greater than 27% in the range of a frequency band from 4.5GHz to 6GHz, an insertion loss simulation graph of a one-in-four power division feed network in the frequency band is given in FIG. 4, the insertion loss of four paths is greater than-6.4 dB, the absolute loss is less than 0.4dB, the amplitude imbalance of each path is less than or equal to +/-0.1 dB, a four-path phase simulation result graph of the one-in-four power division feed network in the frequency band is given in FIG. 5, the phase difference of four paths is less than or equal to +/-1 DEG, a simulation graph of the isolation of two adjacent paths of the one-in-four power division feed network of a broadband antenna is given in FIG. 6, and the isolation is greater than 11dB in the range from 4.5GHz to 6 GHz.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
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 (10)
1. A one-to-four power division feed network of a broadband antenna is characterized in that a microstrip line structure is adopted, and the microstrip line structure comprises a metal conduction band (8);
the metal conduction band (8) comprises an input port (1), a first output port (2), a second output port (3), a third output port (4), a fourth output port (5), a power line (6) and an impedance conversion line (7);
one end of each of the four power dividing lines (6) is connected with the input port (1) respectively, the four power dividing lines (6) are sequentially arranged along the circumferential direction of the input port (1), and the other ends of the four power dividing lines (6) are connected with the end parts of the two impedance transformation lines (7) respectively and form a structure shaped like a Chinese character 'tian';
the first output port (2), the second output port (3), the third output port (4) and the fourth output port (5) are sequentially arranged at four corners of the field-shaped structure.
2. The one-to-four power division feeding network of the broadband antenna according to claim 1, wherein the four square-shaped structures into which the field-shaped structure is divided are all square structures.
3. The broadband antenna one-to-four power division feeding network according to claim 1, wherein the microstrip line structure further comprises an intermediate dielectric layer (9) and a metal ground (10);
the metal conduction band (8) is arranged above the intermediate medium layer (9), and the metal ground (10) is arranged below the intermediate medium layer (9).
4. A broadband antenna one-to-four power division feeding network according to claim 3, characterized in that the input port (1) adopts a circular microstrip line structure.
5. The broadband antenna one-to-four power division feed network according to claim 1, wherein the impedance transformation line (7) adopts 1/4 wavelengths of working frequency points of the feed network.
6. The broadband antenna one-to-four power division feed network of claim 1, wherein the power division line (6) adopts 1/4 wavelengths of working frequency points of the feed network.
7. The broadband antenna one-to-four power division feeding network according to claim 1, wherein any two of the first output port (2), the second output port (3), the third output port (4) and the fourth output port (5) are all axisymmetric structures.
8. The broadband antenna one-to-four power division feeding network according to claim 1, wherein the impedance of the impedance transformation line (7) is 75 ohms.
9. The broadband antenna one-to-four power splitting feed network according to claim 1, wherein the impedance of the power splitting line (6) is 85 ohms.
10. The broadband antenna one-to-four power division feeding network according to claim 1, wherein the first output port (2), the second output port (3), the third output port (4) and the fourth output port (5) are all transmission lines of 50 ohms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110644060.7A CN113410642A (en) | 2021-06-09 | 2021-06-09 | One-to-four power division feed network of broadband antenna |
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| CN202110644060.7A CN113410642A (en) | 2021-06-09 | 2021-06-09 | One-to-four power division feed network of broadband antenna |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012175329A (en) * | 2011-02-21 | 2012-09-10 | Institute Of National Colleges Of Technology Japan | Power feeding matrix circuit and phased array antenna employing the same |
| CN103000977A (en) * | 2012-11-16 | 2013-03-27 | 北京航空航天大学 | Broadband novel microstrip line three-way power divider |
| CN104319462A (en) * | 2014-10-16 | 2015-01-28 | 东南大学 | Dual-polarized ceiling antenna of 3.5GHz wireless local area network |
| CN107369921A (en) * | 2017-07-13 | 2017-11-21 | 江苏智周万物科技有限公司 | Nearly far-field R FID read write lines switchable antenna and its design method |
| CN107706514A (en) * | 2017-08-31 | 2018-02-16 | 西安电子科技大学 | A kind of broadband horizontal polarization omnidirectional antenna |
| CN107732437A (en) * | 2017-09-01 | 2018-02-23 | 哈尔滨工业大学 | Broadband low section horizontally polarized omnidirectional antenna |
| CN111769372A (en) * | 2019-10-22 | 2020-10-13 | 华为技术有限公司 | Antenna assembly and wireless device |
| CN112688070A (en) * | 2020-12-21 | 2021-04-20 | 西安电子科技大学 | Distributed multi-point feed broadband vertical polarization omnidirectional antenna |
-
2021
- 2021-06-09 CN CN202110644060.7A patent/CN113410642A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012175329A (en) * | 2011-02-21 | 2012-09-10 | Institute Of National Colleges Of Technology Japan | Power feeding matrix circuit and phased array antenna employing the same |
| CN103000977A (en) * | 2012-11-16 | 2013-03-27 | 北京航空航天大学 | Broadband novel microstrip line three-way power divider |
| CN104319462A (en) * | 2014-10-16 | 2015-01-28 | 东南大学 | Dual-polarized ceiling antenna of 3.5GHz wireless local area network |
| CN107369921A (en) * | 2017-07-13 | 2017-11-21 | 江苏智周万物科技有限公司 | Nearly far-field R FID read write lines switchable antenna and its design method |
| CN107706514A (en) * | 2017-08-31 | 2018-02-16 | 西安电子科技大学 | A kind of broadband horizontal polarization omnidirectional antenna |
| CN107732437A (en) * | 2017-09-01 | 2018-02-23 | 哈尔滨工业大学 | Broadband low section horizontally polarized omnidirectional antenna |
| CN111769372A (en) * | 2019-10-22 | 2020-10-13 | 华为技术有限公司 | Antenna assembly and wireless device |
| CN112688070A (en) * | 2020-12-21 | 2021-04-20 | 西安电子科技大学 | Distributed multi-point feed broadband vertical polarization omnidirectional antenna |
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Application publication date: 20210917 |