An integrated structure of power division network and correction network

Abstract

The present invention discloses an integrated structure of a power splitting network and a correction network. The power splitting network includes an air cavity and a dielectric plate arranged inside the air cavity. A Wilkinson power splitter is provided on the upper layer of the dielectric plate, and a metal ground is provided on the lower layer of the dielectric plate. Coupling holes are opened on the metal ground. The power splitting network and the correction network are connected through the coupling holes. The present invention links a microstrip power splitting network and a waveguide correction network together through the coupling holes. Different coupling degrees can be achieved by adjusting the size of the coupling holes. In the frequency band of 18.5 GHz to 21.5 GHz, the standing wave of each port is better than 1.3. The correction network achieves a high coupling degree of 40 dB±0.5 dB and stable performance. The problem that the power splitting network and the correction network are large in size and poor in integration, which is not conducive to miniaturization of the structure, is solved. The problem that the coupling degree of the correction network is weak is also solved. The present invention can be widely used in phased array systems.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an integrated structure of a power division network and a correction network. Background Art

[0002] For phased array antenna systems, the antenna's beam coverage is the result of combining multiple channel signals through a power divider network. However, random phase errors can occur in the feed network due to factors such as the processing and installation of the power divider network and the influence of ambient temperature. Furthermore, operational instabilities in the transmitting and receiving components can also introduce amplitude and phase errors. These errors can severely degrade the antenna's beam coverage characteristics, causing a decrease in pattern gain, increased sidelobes, and reduced beam pointing accuracy. To ensure the accuracy of the pattern generated by the power divider network, the amplitude and phase of each channel must be corrected. This involves obtaining the inherent relative amplitude and phase information of each channel.

[0003] The common power splitter network and correction network are basically designed separately. Generally, the signal of each channel of the power splitter network is led out through a coupler, and then the coupled signal is connected to the correction network through a coaxial cable. This is often complicated, large in size, and not conducive to integration.

[0004] There are two common forms of correction networks: one is the parallel-fed correction network, which basically requires the use of a coupler to couple out the energy of each channel, has a complex structure and is large in size; the other is the series-fed correction network, which has a relatively compact structure but poor coupling consistency among the channels and a small coupling degree design range. Summary of the Invention

[0005] The purpose of the present invention is to provide an integrated structure of a power splitter network and a correction network, which solves the problem that the power splitter network and the correction network are large in size, poor in integration, and unfavorable for miniaturized design of the structure. At the same time, it also solves the problem of weak coupling of the correction network, and can be widely used in phased array systems.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An integrated structure of a power splitting network and a correction network, comprising a power splitting network and a correction network, wherein the power splitting network comprises an air cavity and a dielectric plate disposed within the air cavity, wherein a Wilkinson power splitter is disposed on an upper layer of the dielectric plate, and a metal ground is disposed on a lower layer of the dielectric plate, wherein coupling holes are formed on the metal ground;

[0008] The power division network and the correction network are connected through a coupling hole.

[0009] As a further solution of the present invention: the correction network includes a rectangular waveguide, the air cavity of the power division network is opened on the rectangular waveguide, and waveguide coaxial converters for the coupling signal and directional output of the correction network are arranged on both sides of the rectangular waveguide.

[0010] As a further solution of the present invention: a microstrip rectangular block is provided on the Wilkinson power divider, and the microstrip rectangular block is located directly above the center of the coupling hole.

[0011] As a further solution of the present invention: the coupling hole can be a rectangular structure or an elliptical structure.

[0012] As a further solution of the present invention: the coupling hole can be rounded or not.

[0013] As a further solution of the present invention: the Wilkinson power divider is in the form of two sections to form a one-to-two power dividing network, and a resistor 1 and a resistor 2 are mounted on the surface of the Wilkinson power divider.

[0014] As a further solution of the present invention: the resistor 1 is 91 ohms, and the resistor 2 is 270 ohms.

[0015] As a further solution of the present invention: a coaxial connector is further provided between the bottom of the air cavity of the power division network and the rectangular waveguide of the correction network.

[0016] Beneficial effects of the present invention: The present invention realizes the design of integrating the power division network and the correction network. It is no longer necessary to add a coupler to extract the coupling signal. Instead, the coupling signal can be directly extracted by adding a coupling hole at the signal input and output ends and directly sent to the correction network for correction. The structure is simple, which is conducive to integration, weight reduction and miniaturization.

[0017] The power division correction network has stable performance, high reliability, and large coupling (40dB±0.5dB), and can be widely used in phased array systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of a unit structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the four unit combinations of the present invention;

[0021] Figure 3 is the standing wave curve of each port of the present invention;

[0022] Figure 4 is the amplitude simulation curve of the power division network in the present invention;

[0023] Figure 5 It is the port isolation simulation curve of the power division network in the present invention;

[0024] Figure 6 It is the coupling degree curve of the four units of the correction network in the present invention.

[0025] In the figure: 1. Dielectric plate; 2. Wilkinson power divider; 3. Metal ground; 4. Air cavity; 5. Resistor 1; 6. Resistor 2; 7. Coaxial connector; 8. Coupling hole; 9. Microstrip rectangular block; 10. Rectangular waveguide; 11. Waveguide-to-coaxial converter. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] Example 1

[0028] See also Figure 1 As shown, the present invention is an integrated structure of a power splitting network and a correction network, specifically an integrated design of a K-band power splitting network and a correction network. The K-band power splitting network and the correction network constitute a unit structure. The power splitting network includes an air cavity 4 and a dielectric plate 1 disposed inside the air cavity 4. The upper layer of the dielectric plate 1 is provided with a Wilkinson power splitter 2, and the lower layer of the dielectric plate 1 is provided with a metal ground 3, and the metal ground 3 is provided with a coupling hole 8.

[0029] The Wilkinson power divider 2 is a two-section power divider network, and a 91 ohm resistor 5 and a 270 ohm resistor 6 are mounted on the surface of the Wilkinson power divider 2.

[0030] The correction network includes a rectangular waveguide 10, an air cavity 4 of the power splitter network is opened on the rectangular waveguide 10, and waveguide-to-coaxial converters 11 for coupling signals and directional output of the correction network are provided on both sides of the rectangular waveguide 10. The power splitter network and the correction network are connected via a coupling hole 8;

[0031] The correction network uses the wide side of the rectangular waveguide 10 as the coupling side, and opens a coupling hole 8 of the same shape and size as the metal ground 3 of the dielectric plate 1 at the center line position;

[0032] A coaxial connector 7 is also provided between the bottom of the air cavity 4 of the power splitter network and the rectangular waveguide 10 of the correction network;

[0033] Among them, different coupling degrees are achieved by adjusting the length of the coupling hole 8. A microstrip rectangular block 9 is provided on the Wilkinson power divider 2 that is divided into two parts just above the center of the corresponding coupling hole 8. The center of the coupling hole 8 corresponds vertically to the midline of the microstrip rectangular block 9. The length and width of the microstrip rectangular block 9 are adjusted to achieve standing wave matching and coupling consistency of the port.

[0034] The coupling hole 8 can be a rectangular structure or an elliptical structure, and the coupling hole 8 can be rounded or not. The coupling hole 8 can be set according to the number and spacing of the signal channels to be corrected.

[0035] In this solution, the power division network and the correction network are connected through a rectangular coupling hole 8 with a certain height and a rounded corner. The height of the coupling hole 8 is 0.8 mm, which not only ensures the performance index but also takes into account the processing technology and the weight reduction of the shell.

[0036] The coupling signal and directivity of the correction network can be output through the waveguide coaxial converter 11 .

[0037] Example 2

[0038] See Figure 2 This embodiment is basically the same as the implementation of embodiment 1, except that this embodiment adopts a four-unit structure, and the distance between the first coupling hole 8 of the correction network and the port of the rectangular waveguide 10 is greater than half the waveguide wavelength;

[0039] The distance between the coupling holes 8 is determined according to the spacing between the ports of a microstrip one-to-two power splitting network.

[0040] The specific parameters during the implementation of Example 1 and Example 2 are as follows:

[0041] See Figure 3 , the standing wave simulation curve of each port in this implementation mode, the standing wave ratio of each port of the power division network and the correction network is better than 1.3 in the frequency band of 18.5GHz to 21.5GHz.

[0042] See Figure 4 The amplitude distribution curve of the power division network in this implementation has an amplitude consistency of less than 0.2dB within the operating frequency band of 18.5GHz to 21.5GHz, achieving a good amplitude consistency design.

[0043] See Figure 5 The simulation curve of the port isolation of the power division network in this implementation method shows that the port isolation is better than 30dB in the working frequency band of 18.5GHz to 21.5GHz, and the signal transmission has little interference when transmitting between channels.

[0044] See Figure 6In this implementation, the coupling degree curves of the four units of the correction network are 40±0.3dB in the working frequency band of 18.5GHz to 21.5GHz, achieving good coupling degree consistency.

[0045] In summary, this solution combines a microstrip power splitter network with a waveguide correction network through a coupling hole 8. By adjusting the size of the coupling hole 8, different coupling degrees can be achieved. In the 18.5GHz to 21.5GHz frequency band, the standing wave of each port is better than 1.3, the correction network achieves a high coupling degree of 40dB±0.5dB, the amplitude consistency of the power splitter network is better than ±0.2dB, and the port isolation is better than 30dB. It has a small size and stable performance.

[0046] The invention solves the problem of large size and poor integration of the power division network and the correction network, which is not conducive to the miniaturization design of the structure. It also solves the problem of weak coupling of the correction network and can be widely used in phased array systems.

[0047] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An integrated structure of a power division network and a correction network, characterized in that: The invention comprises a power division network and a correction network, wherein the power division network comprises an air cavity (4) and a dielectric plate (1) arranged inside the air cavity (4), the upper layer of the dielectric plate (1) is provided with a Wilkinson power divider (2), the lower layer of the dielectric plate (1) is provided with a metal ground (3), and the metal ground (3) is provided with a coupling hole (8); The power division network and the correction network are connected via a coupling hole (8); The correction network comprises a rectangular waveguide (10), an air cavity (4) of a power division network is opened on the rectangular waveguide (10), and waveguide coaxial converters (11) for coupling signals and directional output of the correction network are arranged on both sides of the rectangular waveguide (10).

2. The integrated structure of a power splitting network and a correction network according to claim 1, characterized in that: A microstrip rectangular block (9) is provided on the Wilkinson power divider (2), and the microstrip rectangular block (9) is located directly above the center of the coupling hole (8).

3. The integrated structure of a power splitting network and a correction network according to claim 1, characterized in that: The coupling hole (8) is a rectangular structure or an elliptical structure.

4. The integrated structure of a power splitting network and a correction network according to claim 1, characterized in that: The coupling hole (8) may have rounded corners or no rounded corners.

5. The integrated structure of a power division network and a correction network according to claim 1, characterized in that: The Wilkinson power divider (2) is in the form of two sections to form a one-to-two power dividing network, and a resistor 1 (5) and a resistor 2 (6) are attached to the surface of the Wilkinson power divider (2).

6. The integrated structure of a power division network and a correction network according to claim 5, characterized in that: The resistor 1 (5) is 91 ohms and the resistor 2 (6) is 270 ohms.

7. The integrated structure of a power splitting network and a correction network according to claim 1, characterized in that: A coaxial connector (7) is also provided between the bottom of the air cavity (4) of the power division network and the rectangular waveguide (10) of the correction network.

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