CN110676586A - Method for realizing multi-beam forming network - Google Patents
Method for realizing multi-beam forming network Download PDFInfo
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- CN110676586A CN110676586A CN201911084154.2A CN201911084154A CN110676586A CN 110676586 A CN110676586 A CN 110676586A CN 201911084154 A CN201911084154 A CN 201911084154A CN 110676586 A CN110676586 A CN 110676586A
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- beam forming
- forming network
- network
- phase shifter
- fixed angle
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/34—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
- H01Q3/36—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means with variable phase-shifters
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Abstract
The invention discloses a method for realizing a multi-beam forming network, which can improve the performance of the multi-beam forming network, simplify the structure of the multi-beam forming network and has great benefit to the engineering realization of a multi-beam antenna. The method omits the use of a-180 DEG fixed angle phase shifter.
Description
Technical Field
The invention relates to the technical field of mobile communication base station antennas, in particular to a method for realizing a multi-beam forming network.
Background
With the rapid development of modern mobile communication technology, the wireless communication demand is growing in a well-spraying manner. The frequency spectrum resources and the site resources are very limited, so that the design of the multi-beam antenna is more and more concerned. The multi-beam antenna can split the original sector into a plurality of sectors, and the network capacity is improved by utilizing a frequency reuse mode. The key component forming the multi-beam antenna is a beam forming network, which is generally realized by a Butler matrix, so that the complexity and the performance advantage and disadvantage degree of the beam forming network are closely related to those of the multi-beam antenna.
A multi-beam forming network is generally assembled with couplers or hybrid networks, fixed angle phase shifters, 0dB crossovers as basic components, as shown in the left hand portion of figures 1, 2. These component implementations may be microstrip lines, suspended striplines, or integrated electronic components. The fixed angle phase shifter is required to be a constant value within the working frequency bandwidth, usually-180 degrees, and cannot generate large fluctuation along with the change of frequency, which has great difficulty in engineering realization.
To solve this problem, there are two methods conventionally used: 1. open-circuit and short-circuit branch nodes are added on the transmission line, and the slope of the fixed angle phase shifter along with the change of frequency is reduced. The disadvantage of this approach is the limited frequency bandwidth achieved, while increasing losses. 2. An equivalent implementation is by means of a coupler or a hybrid network with one or several of its ports grounded. The disadvantage is that the complexity of the network is increased and the losses are also increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, adapt to the practical needs, and discloses a method for realizing a multi-beam forming network.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a method for realizing multi-beam shaping network includes turning over radiation subunit connected to-180 deg phase shifter in radiation unit by 180 deg, connecting it to output end of coupler directly after turning over, and using direction turning over of radiation unit to equivalent-180 deg phase shifter. The method omits the use of a-180 DEG fixed angle phase shifter.
The invention has the beneficial effects that:
the advantages of this implementation are:
1. theoretically, the phase difference is absolute-180 degrees, is not limited by bandwidth, and has excellent performance;
2. the original-180-degree fixed angle phase shifter is eliminated, the network loss is reduced, and the network complexity is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional 2-in 3-out beamforming network and method applied thereto;
fig. 2 is a schematic diagram of a conventional 2-in 4-out beam forming network and an application of the method.
Detailed Description
The invention is further illustrated with reference to the following figures and examples:
example 1: a method for implementing a multi-beam forming network, see fig. 1 and 2.
The multi-beam forming network comprises a coupler (or a hybrid network) and a radiation unit connected with the coupler (or the hybrid network), the method comprises the steps of turning a radiation subunit which needs to be connected with a-180-degree fixed angle phase shifter in the radiation unit by 180 degrees, directly connecting the turned radiation subunit with the output end of the corresponding coupler, and equivalently turning the direction of the radiation unit to form the-180-degree fixed angle phase shifter, so that the method omits the use of the-180-degree fixed angle phase shifter.
The advantages of this implementation are as follows:
1. theoretically, the phase difference is absolute-180 degrees, is not limited by bandwidth, and has excellent performance;
2. the original-180-degree fixed angle phase shifter is eliminated, the network loss is reduced, and the network complexity is reduced. Therefore, the method has a relatively obvious effect on engineering implementation.
The specific use case of the method is as follows:
the principles of the present invention are illustrated by the commonly used 2 in 3 out and 2 in 4 out dual beam forming networks, but not by way of limitation of the claimed invention.
1. Fig. 1 shows an application diagram of a 2-in 3-out beam forming network, in which a port C in a radiation unit, which needs to be connected with a-180 ° fixed angle phase shifter, is turned by 180 °, and is directly connected with an output end of a corresponding coupler after being turned, and the-180 ° fixed angle phase shifter is equivalent by turning the direction of the radiation unit.
The 2-in 3-out beam shaping network phase distribution table is as follows:
the 2-in 3-out beam forming network power distribution table is as follows:
| 1 | 2 | 3 | A | B | C | |
| wave beam A | 1 | 0.5 | 0.5 | 0.5 | 1 | 0.5 |
| Wave beam B | 1 | 0.5 | 0.5 | 0.5 | 1 | 0.5 |
As can be seen from the above table, the phase of the input signal corresponding to the beam a is sequentially increased by 90 ° at A, B, C three output ports; the phase of the input signal corresponding to beam B is sequentially decreased by 90 ° at A, B, C for three output ports. This satisfies the conditions for forming the left and right beams. The power ratios of the three output ports are all 0.5:1:0.5, the three output ports are in a state of high in the middle and low in the two ends, and low side lobes are formed.
2. Fig. 2 shows an application diagram of a 2-in 4-out beam forming network, in which a port a and a port D, which are required to be connected with a-180 ° fixed angle phase shifter, in a radiation unit are turned by 180 °, and directly connected with the output end of a corresponding coupler after being turned, and the-180 ° fixed angle phase shifter is equivalent by turning the direction of the radiation unit.
The phase distribution table of the 2-in 4-out beam forming network is as follows:
the power distribution table of the 2-in 4-out beam forming network is as follows:
| 1 | 2 | 3 | 4 | A | B | C | D | |
| wave beam A | 1 | 4 | 4 | 1 | 1 | 4 | 4 | 1 |
| Wave beam B | 1 | 4 | 4 | 1 | 1 | 4 | 4 | 1 |
As can be seen from the above table, the phase of the input signal corresponding to the beam a is sequentially increased by 90 ° at A, B, C, D three output ports; the phase of the input signal corresponding to beam B is sequentially decreased by 90 ° at A, B, C, D for three output ports. This also satisfies the left and right beam forming conditions. The power ratios of the four output ports are all 1:4:4:1, and the four output ports are also in a state of high in the middle and low at two ends, so that the requirement of forming low side lobes is met.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (1)
1. A method for implementing a multi-beam forming network, the multi-beam forming network comprising a coupler and radiating elements connected to the coupler, the method comprising: the method comprises the steps of turning a radiation subunit, which needs to be connected with a-180-degree fixed angle phase shifter, in a radiation unit by 180 degrees, and directly connecting the turned radiation subunit with the output end of a corresponding coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911084154.2A CN110676586A (en) | 2019-11-07 | 2019-11-07 | Method for realizing multi-beam forming network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911084154.2A CN110676586A (en) | 2019-11-07 | 2019-11-07 | Method for realizing multi-beam forming network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110676586A true CN110676586A (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911084154.2A Pending CN110676586A (en) | 2019-11-07 | 2019-11-07 | Method for realizing multi-beam forming network |
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| Country | Link |
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| CN (1) | CN110676586A (en) |
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2019
- 2019-11-07 CN CN201911084154.2A patent/CN110676586A/en active Pending
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Application publication date: 20200110 |