CN218569195U - Phased array radar antenna - Google Patents
Phased array radar antenna Download PDFInfo
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- CN218569195U CN218569195U CN202223121516.0U CN202223121516U CN218569195U CN 218569195 U CN218569195 U CN 218569195U CN 202223121516 U CN202223121516 U CN 202223121516U CN 218569195 U CN218569195 U CN 218569195U
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Abstract
The utility model discloses a phased array radar antenna relates to antenna engineering technical field. The phased array radar antenna comprises a mounting support, an antenna radio frequency module and a signal processing module, wherein the antenna radio frequency module and the signal processing module are respectively arranged on two opposite sides of the mounting support, the antenna radio frequency module comprises a first radiator with a first radiating air channel, the signal processing module comprises a second radiator with a second radiating air channel, a radiating fan is arranged between the first radiator and the second radiator, and the radiating fan can drive airflow to flow in through the first radiating air channel and discharge through the second radiating air channel. This phased array radar antenna only needs to lay a radiator fan, can satisfy whole antenna system's heat dissipation demand, avoids the defect that prior art exists such as the structure is complicated, weight increase, consumption increase, noise increase, installation risk increase, the processing degree of difficulty increase, cost increase.
Description
Technical Field
The utility model relates to an antenna engineering technical field particularly, relates to a phased array radar antenna.
Background
The radar is an electronic device which emits electromagnetic signals and extracts information from echo signals so as to achieve target detection, positioning and identification. The radar has a plurality of types, and the beam scanning of the common radar is realized by the rotation of an antenna, so the radar is also called as a mechanical scanning radar, and the phased array radar controls the directional change of the radar beam in an electric mode so as to achieve the searching purpose, so the radar is also called as an electric scanning radar. Compared with the common mechanical scanning radar, the phased array radar has greater advantages: the system has the advantages of multiple functions, multiple targets, long distance, strong maneuverability, high response speed, convenient signal processing and high reliability.
Phased array radar generally comprises a large amount of electronic equipment, and the integrated level is high, all contains a large amount of electronic components among these electronic equipment, and many electronic components all can produce the heat in the course of the work, and too high temperature can lead to electronic components performance change or even inefficacy to make electronic equipment break down, consequently, the cooling design just becomes an important component of phased array radar design. In actual conditions, as phased array radars increasingly pursue high power and multiple functions, the integration level of power elements in internal equipment is continuously improved, and forced air cooling is mostly adopted for cooling under the condition that natural cooling cannot be met. Forced air cooling is to increase the air flow rate on the surface of the radar antenna by using a cooling fan so as to achieve the purpose of heat dissipation.
A general phased array radar can be divided into an antenna element, a radio frequency part, a signal receiving part, a signal processing part, a control part, a power supply and the like, and the rest parts except the antenna element part contain electronic components which generate heat during working, so that each part needs to comprise a forced cooling design in the structural design of the whole machine. Therefore, there are several disadvantages: the excessive number of heat dissipation structures leads to the complex structure of the whole machine and increases the weight of the whole machine; the excessive number of the cooling fans needs more control systems to support, so that the power consumption is increased, the noise is increased, and the cost is increased; waterproof sealing and electromagnetic shielding need to be considered at the installation position of the heat dissipation fan, and the more the number is, the more the risk points are; the processing difficulty is high, and the processing cost is increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a phased array radar antenna only needs to lay a radiator fan, can satisfy whole antenna system's heat dissipation demand, avoids the defect that prior art exists such as structure complicacy, weight increase, consumption increase, noise increase, installation risk increase, the processing degree of difficulty increase, cost increase.
The embodiment of the utility model is realized like this:
an embodiment of the utility model provides a phased array radar antenna, including the installing support and set up respectively in the antenna radio frequency module and the signal processing module of the relative both sides of installing support, antenna radio frequency module is including the first radiator that has first heat dissipation wind channel, signal processing module is including the second radiator that has second heat dissipation wind channel first radiator with be provided with radiator fan between the second radiator, radiator fan can drive the air current via first heat dissipation wind channel flows in and passes through second heat dissipation wind channel is discharged. This phased array radar antenna only needs to lay a radiator fan, can satisfy whole antenna system's heat dissipation demand, avoids the defect that prior art exists such as the structure is complicated, weight gain, consumption increase, noise increase, installation risk increase, the processing degree of difficulty increases, cost-push.
Optionally, the first heat sink includes a housing having an air inlet and an air outlet, and a plurality of first heat dissipation fins disposed in the housing, the first heat dissipation duct is formed between two adjacent first heat dissipation fins, and the heat dissipation fan is disposed on an outer wall of the housing and faces the air outlet.
Optionally, the air inlets are respectively disposed at the top and the bottom of the housing, a connection direction of the two air inlets is parallel or approximately parallel to an extending direction of the first heat dissipation air duct, the air outlet is disposed between the two air inlets, and the heat dissipation fan and the air outlet are in positive correspondence to each other in the connection direction of the first heat sink and the second heat sink.
Optionally, the antenna radio frequency module further includes an antenna oscillator unit, a radio frequency unit and a signal acquisition unit that are electrically connected in sequence, the radio frequency unit with the antenna oscillator unit stack gradually set up in the casing deviates from on radiator fan's the outer wall, the signal acquisition unit with radiator fan set up in same one side of casing.
Optionally, the antenna rf module further includes an antenna housing and a first cover plate, the antenna housing, the housing and the first cover plate are sequentially sealed and fixedly connected to form a first accommodating cavity between the antenna housing and the housing for accommodating the antenna element unit and the rf unit, and a second accommodating cavity between the housing and the first cover plate for accommodating the signal acquisition unit and the cooling fan.
Optionally, a heat conducting pad is disposed between the radio frequency unit and the outer wall of the housing, and between the signal acquisition unit and the outer wall of the housing.
Optionally, the second heat sink includes a housing and a plurality of second heat dissipation fins disposed on the housing, the second heat dissipation air duct is formed between two adjacent second heat dissipation fins, and an extending direction of the first heat dissipation fin is parallel or approximately parallel to an extending direction of the second heat dissipation fin.
Optionally, the signal processing module further comprises a power supply unit, a control unit and a signal processing unit which are electrically connected in sequence, and the power supply unit, the control unit and the signal processing unit are respectively arranged on the inner wall of the casing deviating from the second radiating fin.
Optionally, the signal processing module further includes a second cover plate, and the casing is hermetically and fixedly connected to the second cover plate to form a third accommodating cavity for accommodating the power supply unit, the control unit, and the signal processing unit.
Optionally, heat conducting pads are disposed between the power supply unit, the control unit, the signal processing unit and the inner wall of the casing.
The utility model discloses beneficial effect includes:
the phased array radar antenna comprises a mounting support, an antenna radio frequency module and a signal processing module, wherein the antenna radio frequency module and the signal processing module are respectively arranged on two opposite sides of the mounting support, the antenna radio frequency module comprises a first radiator with a first radiating air channel, the signal processing module comprises a second radiator with a second radiating air channel, a radiating fan is arranged between the first radiator and the second radiator, and the radiating fan can drive airflow to flow in through the first radiating air channel and discharge through the second radiating air channel. Through setting up first radiator in antenna radio frequency module to with the heat transfer in the antenna radio frequency module to first radiator, simultaneously, still through setting up the second radiator in signal processing module, in order to with the heat transfer in the signal processing module to the second radiator, again through set up radiator fan between first radiator and second radiator, drive radiator fan carries out work, just can be with the air current suction in the external environment in the first heat dissipation wind channel (namely radiator fan convulsions), thereby dispel the heat to antenna radio frequency module, the air current in the first heat dissipation wind channel flows into finally discharge in the second heat dissipation wind channel (namely radiator fan bloies) afterwards, thereby dispel the heat to signal processing module. Because first radiator and second radiator share radiator fan, consequently, the phased array radar antenna that this application provided can avoid among the prior art because of radiator fan increase and the structure that leads to is complicated, weight increase, the consumption increases, the noise increase, the installation risk increases, the processing degree of difficulty increases, defects such as cost increase.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a phased array radar antenna provided in an embodiment of the present invention;
fig. 2 is an airflow diagram of a phased array radar antenna provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an antenna rf module according to an embodiment of the present invention;
fig. 4 is an exploded schematic view of an antenna rf module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a signal processing module according to an embodiment of the present invention;
fig. 6 is an exploded schematic view of a signal processing module according to an embodiment of the present invention.
Icon: 100-phased array radar antenna; 10-mounting a bracket; 20-an antenna radio frequency module; 21-an antenna housing; 22-a housing; 221-an air inlet; 23-a first cover plate; 24-an antenna array subunit; 25-a radio frequency unit; 26-a signal acquisition unit; 27-a heat-dissipating fan; 30-a signal processing module; 31-a housing; 311-second cooling fins; 32-a second cover plate; 33-a power supply unit; 34-a control unit; 35-signal processing unit.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or internally between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 6, an embodiment of the present disclosure provides a phased array radar antenna 100, including a mounting bracket 10, and an antenna rf module 20 and a signal processing module 30 respectively disposed at two opposite sides of the mounting bracket 10, where the antenna rf module 20 includes a first heat sink having a first heat dissipation air channel, the signal processing module 30 includes a second heat sink having a second heat dissipation air channel, and a heat dissipation fan 27 is disposed between the first heat sink and the second heat sink, and the heat dissipation fan 27 can drive an airflow to flow in through the first heat dissipation air channel and to be discharged through the second heat dissipation air channel. This phased array radar antenna 100 only needs to lay a radiator fan 27, can satisfy the heat dissipation demand of whole antenna system, avoids the defect that prior art exists such as the structure is complicated, weight increase, consumption increase, noise increase, installation risk increase, the processing degree of difficulty increase, cost increase.
It should be noted that, as shown in fig. 1, the phased array radar antenna 100 includes a mounting bracket 10, an antenna rf module 20, and a signal processing module 30, so as to provide mounting and supporting functions for the antenna rf module 20 and the signal processing module 30 through the mounting bracket 10, and at the same time, the antenna rf module 20 and the signal processing module 30 cooperate to complete functions of transmitting electromagnetic signals and extracting information from echo signals. Illustratively, in the present embodiment, the mounting bracket 10 includes two opposite and spaced mounting bars, the antenna rf module 20 has a larger volume and is located on the same side of the two mounting bars as the contact surfaces of the two mounting bars, and the signal processing module 30 has a smaller volume and is located on the opposite side of the two mounting bars as the contact surfaces of the two mounting bars. Regarding the fixing manner of the antenna rf module 20 and the signal processing module 30 to the mounting bracket 10, those skilled in the art should be able to make reasonable selection and design according to the specific structure of the mounting bracket 10 and the actual size of the antenna rf module 20 and the signal processing module 30, and the invention is not limited thereto.
Since the antenna rf module 20 and the signal processing module 30 include many electronic components that generate heat during operation, in the present application, in order to dissipate heat of the antenna rf module 20 and the signal processing module 30, first, as shown in fig. 1, the antenna rf module 20 and the signal processing module 30 are disposed at opposite sides of the mounting bracket 10 at intervals, so as to prevent heat from being accumulated between the antenna rf module 20 and the signal processing module 30 and not being dissipated; on the basis, as shown in fig. 2, the antenna rf module 20 includes a first radiator having a first heat dissipation air channel, the signal processing module 30 includes a second radiator having a second heat dissipation air channel, a heat dissipation fan 27 is disposed between the first radiator and the second radiator, the heat dissipation fan 27 is driven to drive the air flow to flow in through the first heat dissipation air channel and to be discharged through the second heat dissipation air channel, that is, the antenna rf module 20 and the signal processing module 30 are cooled by forced air cooling, so that the heat in the antenna rf module 20 and the signal processing module 30 is taken away by the air flow in sequence.
In the above process, the first heat sink is disposed in the antenna rf module 20 to transfer heat in the antenna rf module 20 to the first heat sink, meanwhile, the second heat sink is disposed in the signal processing module 30 to transfer heat in the signal processing module 30 to the second heat sink, and then the heat dissipation fan 27 is disposed between the first heat sink and the second heat sink to drive the heat dissipation fan 27 to work, so that air flow in the external environment can be sucked into the first heat dissipation air duct (i.e., air suction of the heat dissipation fan 27), thereby dissipating heat from the antenna rf module 20, and then the air flow in the first heat dissipation air duct flows into the second heat dissipation air duct and is finally discharged (i.e., air blowing of the heat dissipation fan 27), thereby dissipating heat from the signal processing module 30. Because first radiator and second radiator share radiator fan 27, consequently, the phased array radar antenna 100 that this application provided has small, light in weight, low power dissipation, the noise is little, the installation risk is low, easy processing, saving cost, the advantage of being convenient for transport to avoid among the prior art because of radiator fan 27 increases defect such as the structure complicacy that leads to, weight increase, power consumption increase, noise increase, installation risk increase, the processing degree of difficulty increase, cost increase.
As shown in fig. 3 and fig. 4, in this embodiment, the first heat sink includes a housing 22 having an air inlet 221 and an air outlet, and a plurality of first heat dissipation fins disposed in the housing 22, a first heat dissipation air duct is formed between two adjacent first heat dissipation fins, so that air flow in an external environment can be sucked into the first heat dissipation air duct through the air inlet 221 under the air draft effect of the heat dissipation fan 27, and air flow in the first heat dissipation air duct can flow into the second heat dissipation air duct through the air outlet under the air blast effect of the heat dissipation fan 27, so that only one heat dissipation fan 27 needs to be disposed on the phased array radar antenna 100, and heat in the antenna rf module 20 and the signal processing module 30 can be taken away through the air flow in sequence, and the heat dissipation fan 27 is disposed on an outer wall of the housing 22 and faces the air outlet to be isolated from other electronic components of the antenna rf module 20, thereby solving the problems of waterproof sealing and electromagnetic shielding.
As shown in fig. 3 and 4, in this embodiment, the number of the air inlets 221 is two, the two air inlets 221 are respectively disposed at the top and the bottom of the housing 22, a connection direction of the two air inlets 221 is parallel or approximately parallel to an extending direction of the first heat dissipation air duct, the air outlet is disposed between the two air inlets 221, and the heat dissipation fan 27 and the air outlet are in a positive correspondence in the connection direction of the first heat sink and the second heat sink (since the heat dissipation fan 27 blocks the air outlet in the drawing, the air outlet is not labeled), so that the heat dissipation fan 27 can smoothly send the air flow in the first heat dissipation air duct into the second heat dissipation air duct, thereby dissipating heat from the antenna rf module 20 and the signal processing module 30 in a forced air cooling manner.
As shown in fig. 4, in this embodiment, the antenna rf module 20 further includes an antenna element unit, an rf unit 25 and a signal acquisition unit 26 electrically connected in sequence, the rf unit 25 and the antenna element unit are sequentially stacked on an outer wall of the casing 22 away from the heat dissipation fan 27, so that the working heat of the rf unit 25 can be transmitted to the first heat sink through the casing 22, and the signal acquisition unit 26 and the heat dissipation fan 27 are disposed on the same side of the casing 22, so that the working heat of the signal acquisition unit 26 can be transmitted to the first heat sink through the casing 22. In this embodiment, the number of antenna element sub-units 24 is illustratively multiple, for example, two, so that the multiple antenna element sub-units 24 can implement splicing extension.
As shown in fig. 4, in this embodiment, the antenna rf module 20 further includes an antenna housing 21 and a first cover plate 23, the antenna housing 21, the housing 22 and the first cover plate 23 are sequentially sealed and fixedly connected to form a first accommodating cavity for accommodating the antenna element unit and the rf unit 25 between the antenna housing 21 and the housing 22, and a second accommodating cavity for accommodating the signal acquisition unit 26 and the heat dissipation fan 27 between the housing 22 and the first cover plate 23, so as to ensure the waterproof sealing and electromagnetic shielding effects of the antenna array subunit 24 and the rf unit 25. It should be noted that the first cover plate 23 is provided with vent holes corresponding to the air inlet 221 and the air outlet, so as to prevent the air inlet 221 and the air outlet from being shielded and affecting the flow of the air flow.
As shown in fig. 5 and fig. 6, in the present embodiment, the second heat sink includes a housing 31 and a plurality of second heat dissipation fins 311 disposed on the housing 31, a second heat dissipation air duct is formed between two adjacent second heat dissipation fins 311, and an extending direction of the first heat dissipation fin is parallel or approximately parallel to an extending direction of the second heat dissipation fin 311, so that the air flow sequentially flows through the first heat dissipation air duct and the second heat dissipation air duct.
As shown in fig. 6, in the present embodiment, the signal processing module 30 further includes a power supply unit 33, a control unit 34, and a signal processing unit 35 that are electrically connected in sequence, and the power supply unit 33, the control unit 34, and the signal processing unit 35 are respectively disposed on an inner wall of the chassis 31 away from the second heat dissipation fin 311, so that the working heat of the power supply unit 33, the control unit 34, and the signal processing unit 35 can be transmitted to the second heat sink through the chassis 31. It should be understood that the control unit 34 should be provided with a signal receiver therein, so as to receive the echo signal collected by the signal collecting unit 26 through the signal receiver.
As shown in fig. 6, in the present embodiment, the signal processing module 30 further includes a second cover plate 32, and the housing 31 is hermetically and fixedly connected to the second cover plate 32 to form a third accommodating cavity for accommodating the power supply unit 33, the control unit 34 and the signal processing unit 35, so as to ensure the waterproof sealing and the electromagnetic shielding effects of the power supply unit 33, the control unit 34 and the signal processing unit 35.
In order to better transfer heat, the housing 22 and the casing 31 may be made of 6063 aluminum alloy material with good thermal conductivity. Besides, optionally, a heat conducting pad, such as a heat conducting silica gel or the like, is disposed between each of the radio frequency unit 25 and the signal acquisition unit 26 and the outer wall of the housing 22, so that the working heat of the radio frequency unit 25 and the signal acquisition unit 26 is better transferred to the first heat sink. Optionally, heat conducting pads, such as heat conducting silica gel, are disposed between the inner walls of the housing 31 and the power supply unit 33, the control unit 34 and the signal processing unit 35, so that the working heat of the power supply unit 33, the control unit 34 and the signal processing unit 35 can be better transferred to the second heat sink.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a phased array radar antenna, its characterized in that, including the installing support and set up respectively in the antenna radio frequency module and the signal processing module of the relative both sides of installing support, antenna radio frequency module is including the first radiator that has first heat dissipation wind channel, signal processing module is including the second radiator that has second heat dissipation wind channel first radiator with be provided with radiator fan between the second radiator, radiator fan can drive the air current via first heat dissipation wind channel flows in and passes through second heat dissipation wind channel is discharged.
2. The phased array radar antenna according to claim 1, wherein the first heat sink comprises a housing having an air inlet and an air outlet, and a plurality of first heat dissipation fins disposed in the housing, the first heat dissipation duct is formed between two adjacent first heat dissipation fins, and the heat dissipation fan is disposed on an outer wall of the housing and faces the air outlet.
3. The phased array radar antenna according to claim 2, wherein the number of the air inlets is two, the two air inlets are respectively disposed at the top and the bottom of the housing, a connection line direction of the two air inlets and an extension direction of the first heat dissipation air duct are parallel or approximately parallel, the air outlet is disposed between the two air inlets, and the heat dissipation fan and the air outlet are in positive correspondence with each other in a connection line direction of the first heat sink and the second heat sink.
4. The phased array radar antenna according to claim 2, wherein the antenna rf module further comprises an antenna element unit, an rf unit and a signal acquisition unit, which are electrically connected in sequence, wherein the rf unit and the antenna element unit are sequentially stacked on an outer wall of the housing away from the heat dissipation fan, and the signal acquisition unit and the heat dissipation fan are disposed on the same side of the housing.
5. The phased array radar antenna according to claim 4, wherein the antenna radio frequency module further comprises an antenna housing and a first cover plate, and the antenna housing, the housing and the first cover plate are sequentially sealed and fixedly connected to form a first accommodating cavity for accommodating the antenna element unit and the radio frequency unit between the antenna housing and the housing and a second accommodating cavity for accommodating the signal acquisition unit and the heat dissipation fan between the housing and the first cover plate.
6. The phased array radar antenna of claim 4, wherein thermal pads are disposed between the radio frequency unit and the signal acquisition unit and an outer wall of the housing.
7. The phased array radar antenna according to claim 2, wherein the second heat sink comprises a housing and a plurality of second heat dissipation fins disposed on the housing, the second heat dissipation air duct is formed between two adjacent second heat dissipation fins, and the extension directions of the first heat dissipation fins and the second heat dissipation fins are parallel or approximately parallel to each other.
8. The phased array radar antenna according to claim 7, wherein the signal processing module further comprises a power supply unit, a control unit and a signal processing unit which are electrically connected in sequence, and the power supply unit, the control unit and the signal processing unit are respectively arranged on an inner wall of the casing, which is away from the second heat dissipation fin.
9. The phased array radar antenna of claim 8, wherein the signal processing module further comprises a second cover plate, the housing being sealed and fixedly attached to the second cover plate to cooperatively form a third receiving cavity for receiving the power supply unit, the control unit, and the signal processing unit.
10. The phased array radar antenna of claim 8, wherein thermal pads are disposed between the power supply unit, the control unit, and the signal processing unit and an inner wall of the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223121516.0U CN218569195U (en) | 2022-11-17 | 2022-11-17 | Phased array radar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223121516.0U CN218569195U (en) | 2022-11-17 | 2022-11-17 | Phased array radar antenna |
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| Publication Number | Publication Date |
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| CN218569195U true CN218569195U (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223121516.0U Active CN218569195U (en) | 2022-11-17 | 2022-11-17 | Phased array radar antenna |
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