Feed calibration device, feed calibration system of array antenna and aircraft

Abstract

The invention relates to a feed calibration device, an array antenna feed calibration system and an aircraft, the feed calibration device comprises a feed calibration network, a dielectric substrate and a metal ground which are stacked, the feed calibration network is a top layer, the dielectric substrate is a middle layer, and the metal ground is a bottom layer; wherein the feed calibration network comprises a power divider and a coupler, the input end of the power divider is connected with the power supply and the metal ground, and a plurality of output ends of the power divider are respectively connected with the coupler. By adopting the method, the problem of complex structure of the feed calibration network can be solved.

Description

Technical Field

[0001] The present application relates to the field of calibration networks, and particularly to a feeding calibration device, a feeding calibration system for an array antenna, and an aircraft. Background Art

[0002] Phased array antennas are flexibly used in various radar, wireless communication and other systems due to their reliability and high efficiency. Considering the influence of external environment and other factors on phased array antennas, the amplitude-phase characteristics of each channel will be disturbed, which will deteriorate the antenna performance and cause it to malfunction. Therefore, all T / R (Transmitter and Receiver) channels need to be regularly detected, and the abnormal amplitude-phase characteristics need to be corrected and compensated.

[0003] Common calibration methods include transmit calibration and receive calibration, and both can be further divided into external calibration and internal calibration. External calibration usually adds calibration units in the array and uses the spatial coupling or near-field coupling between the array units and the calibration units to detect the antenna. Internal calibration is achieved by adding a coupler at the output end of the T / R component. External calibration requires less equipment, but is easily affected by the environment and has low calibration accuracy. On the contrary, internal calibration requires a complex network, but is not easily interfered by the outside world and has high calibration accuracy. Therefore, internal calibration has been widely studied, and the most critical part is the design of the feeding calibration network.

[0004] In traditional technologies, the design method of the feeding calibration network often designs multiple independent functional modules based on a rigid substrate, such as phase shifter, feeding and calibration modules, and combines each functional module together through metallized vias or metal connecting rods, which increases the profile height of the device equipped with the feeding calibration network, making the design and installation of the feeding calibration network more complex.

[0005] In view of the problem of the complex structure of the feeding calibration network in the related technologies, no effective solution has been proposed yet. Summary of the Invention

[0006] Based on this, it is necessary to provide a feeding calibration device, a feeding calibration system for an array antenna, and an aircraft for the above technical problems, so as to at least solve the problem of the complex structure of the feeding calibration network.

[0007] In a first aspect, a feeding calibration device is provided in this embodiment. The device includes: a feeding calibration network, a dielectric substrate, and a metal ground that are stacked. The feeding calibration network is the top layer, the dielectric substrate is the middle layer, and the metal ground is the bottom layer; wherein,

[0008] The feeding calibration network includes a power divider and a coupler. The input end of the power divider is connected to a power supply and the metal ground, and multiple output ends of the power divider are respectively connected to the coupler.

[0009] In some of these embodiments, the feed calibration network includes: a first power divider, a second power divider, and a plurality of couplers; wherein,

[0010] The output ends of the first power divider are respectively connected to the coupling ends of the plurality of couplers;

[0011] The output ends of the second power divider are respectively connected to the input ends of the plurality of couplers.

[0012] In some of these embodiments, the coupler is a microstrip directional coupler.

[0013] In some of these embodiments, the dielectric substrate is a flexible thin-film substrate.

[0014] In some of these embodiments, the feed calibration network includes: a plurality of isolation resistors; wherein,

[0015] Each of the isolation resistors is externally welded such that the first end of each isolation resistor is connected to the isolation port of the corresponding coupler, and the second end of each isolation resistor is connected to the metal ground layer based on a grounding hole, and the grounding hole is a metallized via.

[0016] In some of these embodiments, the power divider is an octal T-shaped power divider.

[0017] In some of these embodiments, the metal ground covers the lower side of the dielectric substrate.

[0018] In a second aspect, in the present embodiment, a feed calibration system for an array antenna is provided. The device includes: an array antenna and the feed calibration device described in any of the device embodiments in the first aspect above; wherein, the feed calibration device is used to calibrate the array antenna.

[0019] In some of these embodiments, the array antenna includes a plurality of antenna elements, and the plurality of antenna elements are respectively connected to the couplers in the feed calibration device in one-to-one correspondence.

[0020] In a third aspect, in the present embodiment, an aircraft is provided. The aircraft includes: a fuselage, wings, and the feed calibration system for the array antenna described in any of the system embodiments in the second aspect above. It is characterized in that the feed calibration system for the array antenna is located inside the wings.

[0021] The above feed calibration device, the feed calibration system of the array antenna, and the aircraft set the feed network and the calibration network on the same layer, and by connecting the coupler to the power divider and connecting the input end of the power divider to the metal ground, the metal ground is used as the common ground for the feed calibration network and the device to be calibrated, making the structure of the feed calibration device compact and simple, thus solving the problem of the complex structure of the feed calibration network. Description of the Drawings

[0022] Figure 1 It is a schematic structural block diagram of a feed calibration device in an embodiment;

[0023] Figure 2 It is a schematic structural diagram of a feed calibration network in an embodiment;

[0024] Figure 3 It is a schematic structural diagram of an isolation resistor in an embodiment;

[0025] Figure 4 It is a schematic structural diagram of a feed calibration system of an array antenna in an embodiment;

[0026] Figure 5 It is a structural block diagram of an aircraft in an embodiment.

[0027] Reference Signs: 1, grounding hole; 2, isolation resistor. Detailed Embodiments

[0028] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] Unless otherwise defined, technical terms or scientific terms involved in this application shall have the general meanings understood by those with ordinary skills in the technical field to which this application belongs. In this application, words such as "a", "an", "one kind", "the", "these", etc. do not indicate a limitation in quantity, and they can be singular or plural. The terms "including", "containing", "having" and any variants thereof involved in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent in these processes, methods, products or devices. The words such as "connected", "linked", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly connected. The "multiple" involved in this application means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, and B exists alone. Usually, the character " / " means that the objects associated before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific sorting of the objects.

[0030] A typical feed calibration network mainly includes an N-way directional coupler and N antenna input ports. Each path connecting the antenna is provided with a coupler, and the coupled signals are synthesized and transmitted to the calibration port through a multi-way power divider, so as to detect the amplitude-phase consistency of the signals at each port of the antenna. Therefore, in the traditional technology, feeding and calibration are realized through a multi-layer structure. Specifically, multiple layers of PCB boards are often set in the traditional technology. One layer of PCB board is used as a feed network including multiple combiners, and another layer of PCB board is used as a calibration network including couplers. Among them, the combiners are installed in a segmented form, and each combiner module is connected to the ground through a screw through hole. At the same time, each combiner module is connected to the coupler through a metal via. The coupler is also connected to the ground through a screw through hole. Such a design structure of the feed calibration device is complex, with too many installation parts, increasing costs.

[0031] In one embodiment, as Figure 1 shown, a feed calibration device is provided, including: a stacked feed calibration network, a dielectric substrate and a metal ground. The feed calibration network is the top layer, the dielectric substrate is the middle layer, and the metal ground is the bottom layer; wherein, the feed calibration network includes a power divider and a coupler. The input end of the power divider is connected to the power supply and the metal ground, and multiple output ends of the power divider are respectively connected to the coupler.

[0032] The power feeding and calibration network has both power feeding function and calibration function. Among them, the coupler is connected to the device to be calibrated. By obtaining the amplitude and phase responses of the signals generated by the device to be calibrated, it ensures that the performance such as power and phase of the device to be calibrated meets the expected standards, thus realizing the calibration function. The power splitter is used to evenly or according to a specific ratio distribute the power supply signal received at the input end to multiple output ends. For example, a 1-to-N power splitter includes one input end and N output ends, and can evenly or according to a specific ratio divide the power supply signal received at the input end into N parts and send them to the N output ends respectively. In the power feeding and calibration network, the power splitter receives the signal input from the power supply, divides the input signal into multiple parts and outputs them to the coupler respectively for feeding the coupler, thus realizing the power feeding function.

[0033] In this embodiment, since the device to be calibrated realizes calibration through the coupler, and the coupler is connected to the power splitter, and the input end of the power splitter is connected to the metal ground, therefore, the metal ground in the power feeding and calibration device is not only the ground of the power feeding and calibration network, but also the ground of the device to be calibrated. Using the metal ground on the lower layer of the dielectric substrate as the common ground of the power feeding and calibration network and the device to be calibrated, there is no need to specifically set an extra ground layer for the device to be calibrated, or set metal vias or connecting rods to connect the device to be calibrated to the metal ground layer, which can achieve the effects of simplifying the structure of the power feeding and calibration device and reducing the manufacturing and design costs of the power feeding and calibration device.

[0034] Moreover, compared with the method of separately feeding multiple couplers with multiple external power splitters, or setting the power splitter and the coupler on different layers and realizing the connection between the power splitter and the coupler through metal vias and metal blind vias. In this embodiment, the power splitter and the coupler are set on the same layer, and one power splitter feeds multiple couplers, and the power feeding and calibration functions are realized through one layer of power feeding and calibration network, with a compact and simple structure, and there is no need to set metal vias or metal connecting rods for connection, thereby reducing the design cost.

[0035] In some of the embodiments, Figure 2 a structural schematic diagram of a power feeding and calibration network is provided, as Figure 2 shown, the power feeding and calibration network includes: a first power splitter, a second power splitter and several couplers; among them, the output ends of the first power splitter are respectively connected to the coupling ends of the several couplers to feed the couplers; the output ends of the second power splitter are respectively connected to the input ends of the several couplers. Among them, the input ends of the first power splitter and the second power splitter are respectively connected to the same power supply, and the outputs of the first power splitter and the second power splitter are the same. The first power splitter is connected to the coupling end of the coupler to feed the coupling end of the coupler; the second power splitter is connected to the input end of the coupler to feed the input end of the coupler.

[0036] Optionally, the power divider is a one-to-eight T-shaped power divider. At this time, the feeding calibration network includes a T-shaped one-to-eight first power divider, a T-shaped one-to-eight second power divider, and at most eight couplers. It can be understood that other power dividers can also be selected according to application requirements, such as a one-to-two power divider or a one-to-three power divider. The number of couplers in the feeding calibration network is not greater than the number of output ports of the power divider.

[0037] Optionally, the coupler is a microstrip directional coupler. The microstrip directional coupler uses a microstrip line to realize signal coupling, so that the coupler in the feeding calibration network can be fabricated on the upper layer of the dielectric substrate through the microstrip line. The microstrip directional coupler includes an input end, a through output end, and a coupling end. Optionally, the microstrip directional coupler is a four-port network, which has an input end, an output end, a coupling end, and an isolation end. Among them, the input end and the coupling end are respectively connected to two power dividers. At the same time, the output end of the microstrip directional coupler is connected to the device to be calibrated, so that the microstrip directional coupler can obtain the signal of the device to be calibrated and monitor and analyze the performance of the device to be calibrated.

[0038] If the microstrip directional coupler further includes an isolation end, the isolation end can be connected to the isolation resistor 2 to provide better signal isolation and matching, and the reflected signal interferes with the main signal path or the measurement result. In some of these embodiments, the feeding calibration network includes: a plurality of isolation resistors 2; among them, each isolation resistor 2 is externally welded, so that the first end of each isolation resistor 2 is connected to the isolation end of the corresponding coupler, and the second end of each isolation resistor 2 is connected to the metal ground layer based on the grounding hole 1, and the grounding hole 1 is a metallized via. Among them, a hollow groove is provided on one side of the microstrip line, and the isolation resistor 2 is externally welded based on the hollow groove to connect the isolation end of the coupler and the grounding hole 1. Figure 3 The structural schematic diagram of the isolation resistor 2 is provided, as Figure 3 shown. The resistor welding method can simplify the processing complexity of the printed circuit board of the feeding calibration network and effectively reduce the processing cost while maintaining its good amplitude-phase consistency electrical performance.

[0039] In some of these embodiments, the metal ground in the feeding calibration device covers the lower side of the dielectric substrate. The material of the metal ground can be copper or other metals.

[0040] In the related art, a rigid dielectric substrate is used for the calibration feeding device, and the profile height of the substrate is high, which increases the profile height of the device to be calibrated. When the calibration feeding device calibrates a flexible array antenna, the rigid dielectric substrate makes it difficult for the calibration feeding device to conform to the flexible array antenna.

[0041] To solve this problem, in some of these embodiments, the dielectric substrate in the feed calibration device is a flexible thin-film substrate. The flexible thin-film material has the characteristics of low profile and light weight. Using a flexible dielectric substrate can make the structure of the feed calibration device have the advantage of light weight, and the flexible dielectric substrate can be bent, so that the calibration feed device is easy to achieve conformal with the device to be calibrated. Especially when the device to be calibrated is a flexible device, the calibration feed device can better meet the need for conformal of the calibration network with the flexible device compared with the calibration network in the traditional technology. Exemplarily, the dielectric substrate uses polyimide - PI material, and the thickness of the dielectric substrate is in the range of 0.05 mm - 0.125 mm. The specific material and thickness selection can also be changed according to the requirements of the device to be calibrated.

[0042] In one of the embodiments, a fully flexible thin-film feed calibration integrated device for a flexible array antenna is provided. The fully flexible thin-film feed calibration integrated device adopts a three-layer structure. The upper layer of the fully flexible thin-film feed calibration integrated device is the feed calibration network layer. The feed calibration network layer includes two one-to-eight power dividers, 8 parallel directional couplers, and 8 isolation resistors 2. Among them, the power divider selects a T-shaped power divider, and the coupler selects a microstrip coupler. One of the power dividers feeds power to the coupling end of the parallel directional coupler, and the other power divider feeds power to the input end of the parallel directional coupler. The input ends of the two power dividers are grounded. The isolation resistor 2 is connected by an external welding method at the isolation end of the microstrip coupler. At the hollow part of the ground on one side of the microstrip line of the microstrip coupler, a grounding hole 1 is obtained by the method of metallized vias, and the grounding hole 1 is connected to the isolation resistor 2, so that one end of the isolation resistor 2 is connected to the isolation end of the parallel directional coupler, and the other end of the isolation resistor 2 is grounded. The middle layer of the fully flexible thin-film feed calibration integrated device is a dielectric substrate made of polyimide - PI material. Copper is plated on the lower layer of the dielectric substrate, and this layer of copper is used as the bottom layer structure of the fully flexible thin-film feed calibration integrated device. Among them, the copper on the lower layer of the dielectric substrate is the common ground for the flexible array antenna and the feed calibration network ground.

[0043] The structural setting of the fully flexible thin-film feed calibration integrated device in this embodiment solves the disadvantages of the traditional feed calibration network. The effects achieved by this embodiment will be described below:

[0044] (1) Traditional feed calibration networks use rigid dielectric substrates, which are difficult to conform to flexible antenna arrays. The non-conformity between the calibration network and the flexible antenna can lead to problems such as antenna parameters not meeting the design requirements and impedance mismatch, thus reducing the antenna efficiency and system performance. It will introduce unnecessary stress, affecting the long-term stability and service life of the antenna; it will also affect the accuracy of the signal obtained by the coupler, resulting in inaccurate calibration results. In this embodiment, a fully flexible thin-film feed calibration integrated network is designed, abandoning the traditional rigid dielectric substrate and using polyimide - PI as the flexible dielectric substrate. The flexible dielectric substrate can make the structure of the feed calibration network lighter and easier to conform to the flexible array antenna, and can be used for the feed calibration of the flexible array antenna.

[0045] (2) The feed calibration integrated network of traditional array antennas adopts a multi-layer structure, with the transmission layer, coupling network layer, and feed network layer designed separately on each layer, increasing the design complexity and manufacturing cost. In this patent, the lower layer of the dielectric substrate is copper-clad as the ground of the antenna and the common ground of the feed calibration integrated network, and the feed network of the antenna and the calibration network of the antenna are both set on the upper layer of the dielectric substrate, making the structure of the fully flexible thin-film feed calibration integrated network in this embodiment compact and simple.

[0046] (3) When traditional array antennas use this coupler to calibrate the antenna, the coupler uses an external power divider for separate feeding. Or, the power divider and the coupler are set on different layers respectively, and metal vias and metal blind vias are required to connect between the two layers, increasing the design complexity. In this embodiment, an eight-way power divider feeds multiple parallel directional couplers to design a feed calibration network, reducing the manufacturing cost and simplifying the design complexity. Moreover, in this embodiment, the feed calibration network adopts an external welding method to weld the isolation resistors at the isolation ends of the directional couplers. This resistor welding method can simplify the printed circuit board processing complexity and effectively avoid the processing cost while ensuring that the coupler has good amplitude-phase consistency and good electrical performance.

[0047] Based on the same inventive concept, the embodiment of the present application also provides a feed calibration system for an array antenna including the above-mentioned feed calibration device. The implementation solution provided by this system to solve problems is similar to the implementation solution described in the above device. Therefore, the specific limitations in one or more embodiments of the feed calibration system for an array antenna provided below can refer to the limitations on the feed calibration device in the above text.

[0048] In one embodiment, Figure 4 A feed calibration system for an array antenna is provided. As Figure 4As shown in the figure, the feeding calibration system of the array antenna includes: an array antenna and a feeding calibration device. The feeding calibration device is used to calibrate the array antenna. Among them, the feeding calibration device includes a feeding calibration network, a dielectric substrate, and a metal ground arranged in a stacked manner. The feeding calibration network is the top layer, the dielectric substrate is the middle layer, and the metal ground is the bottom layer; the feeding calibration network includes a power divider and a coupler. The input end of the power divider is connected to the power supply and the metal ground, and multiple output ends of the power divider are respectively connected to the coupler.

[0049] In this embodiment, the feeding calibration device composed of a three-layer structure is used to calibrate the array antenna. Since the feeding function and the calibration function of the feeding calibration device are designed on the same layer, and the metal ground is the common ground for the feeding calibration network and the array antenna, the feeding calibration device has the characteristics of simple and compact hierarchical structure. Using such a feeding calibration device to realize the calibration of the array antenna reduces the profile height of the feeding calibration system of the array antenna without affecting the performance of the antenna and the overall structural characteristics of the array antenna. At the same time, it reduces the design cost and manufacturing cost of the feeding calibration system of the array antenna.

[0050] In one embodiment, the array antenna includes multiple antenna elements, and the multiple antenna elements are respectively and correspondingly connected to the couplers in the feeding calibration device. Among them, the array antenna is composed of multiple antenna elements. There may be deviations between the actual performance and the theoretical values of each antenna element, and it is necessary to calibrate each antenna element separately through the calibration network to ensure that the signal amplitudes and phases of the array antenna are consistent, so as to improve the performance of the entire array. Optionally, a calibration port is set between the baseband subsystem and the antenna subsystem of the array antenna, and the feeding calibration device of the array antenna is connected to the base station system through this calibration port. The baseband subsystem transmits calibration signals to each array antenna element through the calibration port. The calibration signals are transmitted back to the baseband subsystem through the calibration network of the array antenna. The baseband subsystem estimates the losses and phase shifts brought by the signal transmission path according to the transmitted-back calibration signals, and automatically compensates for these losses and phase shifts to make the transmitted working signals have the same amplitude and the same phase. Specifically, the transmitting end of the baseband subsystem respectively transmits radio frequency signals into each sub-calibration network module, that is, each first power divider. After the radio frequency signal is transmitted to the input end of the coupler by the first power divider, through the connection between the output end of the coupler and the antenna radiation element, the antenna radiates into the space to transmit the calibration signal. At the same time, the coupler transmits the coupled calibration signal to the second power divider, and the second power divider transmits the calibration signals of each sub-calibration network module received back to the baseband subsystem.

[0051] In one embodiment, in the feeding calibration device of the feeding calibration system of the array antenna, a metal ground covers the lower side of the dielectric substrate. The feeding calibration network includes a first power divider, a second power divider, and a plurality of couplers; wherein, the output ends of the first power divider are respectively connected to the coupling ends of the plurality of couplers; the output ends of the second power divider are respectively connected to the input ends of the plurality of couplers. Optionally, the coupler is a microstrip directional coupler. The power divider is an octal T-shaped power divider.

[0052] Optionally, the feeding calibration network includes: a plurality of isolation resistors 2; wherein, each isolation resistor 2 is externally welded, such that the first end of each isolation resistor 2 is connected to the isolation port of the corresponding coupler, and the second end of each isolation resistor 2 is connected to the metal ground layer based on the grounding hole 1, and the grounding hole 1 is a metallized via.

[0053] In one embodiment, in the feeding calibration device of the feeding calibration system of the array antenna, the dielectric substrate is a flexible thin-film substrate. The radiation surface and the ground of the feeding calibration integrated network are designed on one thin film, which changes the characteristics of the traditional multi-layer structure of the feeding calibration integrated network, and realizes that one thin film is a feeding calibration integrated network. Also, because the dielectric substrate is a flexible thin film, the thickness of the feeding calibration integrated network can be as low as dozens of micrometers, its structure is lighter, and the feeding calibration integrated network can be completely curled. Therefore, the feeding calibration device is easy to conform to the array antenna and can be used for the feeding calibration of the flexible array antenna.

[0054] Those skilled in the art can understand that Figure 4 the structure shown in

[0055] is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the array antenna to which the solution of the present application is applied.

[0056] Based on the same inventive concept, an embodiment of the present application further provides an aircraft including the feeding calibration system of the array antenna involved above. The specific limitations in the embodiment of the feeding calibration system of the array antenna can be referred to the limitations on the feeding calibration system of the array antenna in the above text.

[0056] In one embodiment, as Figure 5 shown, an aircraft is provided, and the aircraft includes: a fuselage, wings, and a feeding calibration system of the array antenna, and the feeding calibration system of the array antenna is located inside the wings. Wherein, the feeding calibration system of the array antenna includes: an array antenna, a feeding calibration device, and the feeding calibration device is used to calibrate the array antenna.

[0057] Among them, the feeding calibration system of the array antenna includes: an array antenna and a feeding calibration device. The feeding calibration device is used to calibrate the array antenna. Among them, the feeding calibration device includes a stacked feeding calibration network, a dielectric substrate, and a metal ground. The feeding calibration network is the top layer, the dielectric substrate is the middle layer, and the metal ground is the bottom layer; the feeding calibration network includes a power divider and a coupler. The input end of the power divider is connected to the power supply and the metal ground, and multiple output ends of the power divider are respectively connected to the coupler. Optionally, the array antenna includes multiple antenna units, and the multiple antenna units are respectively connected to the couplers in the feeding calibration device in one-to-one correspondence.

[0058] In one embodiment, in the feeding calibration device of the feeding calibration system of the array antenna, the metal ground covers the lower side of the dielectric substrate. The feeding calibration network includes a first power divider, a second power divider, and several couplers; among them, the output ends of the first power divider are respectively connected to the coupling ends of the several couplers; the output ends of the second power divider are respectively connected to the input ends of the several couplers. Optionally, the coupler is a microstrip directional coupler. The power divider is an eight-way T-shaped power divider. The dielectric substrate is a flexible thin film substrate.

[0059] Optionally, the feeding calibration network includes: several isolation resistors 2; among them, each isolation resistor 2 is externally welded, so that the first end of each isolation resistor 2 is connected to the isolation port of the corresponding coupler, and the second end of each isolation resistor 2 is connected to the metal ground layer based on the grounding hole 1, and the grounding hole 1 is a metallized via.

[0060] In this embodiment, the feeding calibration device and the array antenna microsystem can have a simple and practical structural form and a light structural weight, so that the feeding calibration system of the array antenna can be conveniently and quickly installed on the wing skin. At the same time, installing the feeding calibration system of the array antenna inside the wing can change the form of the traditional rod antenna extending out of the wing or the aircraft and the high-profile external feeding calibration network, so as not to affect the overall aerodynamic performance of the aircraft and enhance the applicability.

[0061] Those skilled in the art can understand that Figure 5 the structure shown in is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the aircraft to which the solution of this application is applied. The specific aircraft may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0062] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0063] The above embodiments only illustrate several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A feed calibration device, characterized in that, The device includes: a stacked feed calibration network, a dielectric substrate, and a metal ground. The feed calibration network is the top layer, the dielectric substrate is the middle layer, and the metal ground is the bottom layer. Among them, The feed calibration network includes a power divider and a coupler. The input end of the power divider is connected to a power supply and the metal ground, and multiple output ends of the power divider are respectively connected to the coupler.

2. The device according to claim 1, characterized in that, The feed calibration network includes: a first power divider, a second power divider, and several couplers. Among them, The output ends of the first power divider are respectively connected to the coupling ends of the several couplers. The output ends of the second power divider are respectively connected to the input ends of the several couplers.

3. The device according to claim 1 or 2, characterized in that The coupler is a microstrip directional coupler.

4. The device according to claim 1, characterized in that The dielectric substrate is a flexible thin-film substrate.

5. The device according to claim 1, characterized in that, The feed calibration network includes: several isolation resistors. Among them, Each of the isolation resistors is externally welded, so that the first end of each isolation resistor is connected to the isolation port of the corresponding coupler, and the second end of each isolation resistor is connected to the metal ground layer based on a grounding hole, and the grounding hole is a metallized via.

6. The device according to claim 1, characterized in that The power divider is an octal T-shaped power divider.

7. The device according to claim 1, characterized in that, The metal ground covers the lower side of the dielectric substrate.

8. A feeding calibration system for an array antenna, characterized in that, The device includes: an array antenna and the feed calibration device according to any one of claims 1 to 7. Among them, the feed calibration device is used to calibrate the array antenna.

9. The system according to claim 8, wherein, The array antenna includes a plurality of antenna elements, and the plurality of antenna elements are respectively connected to the couplers in the feed calibration device in one-to-one correspondence.

10. An aircraft, characterized in that, The aircraft includes: a fuselage, a wing, and the feed calibration system of the array antenna according to claim 8, and the feed calibration system of the array antenna is located inside the wing.

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