KR102069881B1 - Thermal radiating apparatus for active antenna, and active antenna - Google Patents

Abstract

The present invention relates to a heat dissipation device including: a plurality of plate portions in thermally contact with transception elements; an inlet header portion communicating with one end part of the plate portion and having a cross-sectional area of an upstream section smaller than the same of a downstream section, based on the flow of the cooling fluid; an outlet header portion in communication with the other end part of the plate portion and having a cross-sectional area of the upstream section larger than the same of the downstream section, based on the flow of the cooling fluid; and a cooling fluid circulation portion providing the cooling fluid to the plate portion through the inlet header portion and the outlet header portion and recovering the cooling fluid from the plate portion. Provided are the heat dissipation device which can improve the thermal reliability and the active antenna.

Description

Heat sink and active antenna of active antenna {THERMAL RADIATING APPARATUS FOR ACTIVE ANTENNA, AND ACTIVE ANTENNA}

The present invention relates to a heat dissipation device and an active antenna of an active antenna, and more particularly, to a heat dissipation device of an active antenna that can increase the thermal reliability of the active antenna and an active antenna having the same.

In military systems, antennas are a key weapons system for land, sea, and air power that perform missions from battlefield surveillance to target strikes. Antennas for weapon systems require high performance specifications for improved detection range, precise detection and strikes.

With the development of semiconductor technology, antennas are also getting higher and smaller. The antenna for the weapon system has recently evolved from a passive electrically scanned array antenna to an active electrically scanned array antenna.

Active phased array antennas (called 'active antennas') can increase and decrease the size and performance of conventional passive phased array antennas by fabricating transmit / receive modules using semiconductor technology. Such an active antenna has high performance and high heat generation transmission / reception elements in the transmission / reception module. Therefore, the current active antenna has a larger heat generation per unit area of the transmission / reception module than the conventional passive phased array antenna.

In order to maintain the performance of the active antenna, the heat dissipation design should effectively remove the heat generated from the transmission and reception elements and allow the transmission and reception elements to operate in the appropriate temperature range.

The background art of this invention is published in the following patent document.

KR 10-1909684 B1 KR 10-1586794 B1 KR 10-1174637 B1

The present invention provides a heat dissipation device of an active antenna that can increase the thermal reliability of the active antenna and an active antenna having the same.

A heat dissipating device of an active antenna according to an embodiment of the present invention includes a plurality of plate parts arranged in a first direction, extending in a second direction, and thermally contacting transmission / reception elements of the active antenna; An inlet header portion extending in a first direction and communicating with one end of the plate portion; An outlet header portion extending in a first direction and communicating with the other end portion of the plate portion; And a cooling fluid circulation part for supplying cooling fluid to the plate part and recovering the cooling fluid from the plate part through the inlet header part and the outlet header part, wherein the inlet header part is based on the flow of the cooling fluid. The cross-sectional area of the upstream section is smaller than the cross-sectional area of the downstream section, and the outlet header portion has a larger cross-sectional area of the upstream section than that of the downstream section.

A heat dissipating device of an active antenna according to an embodiment of the present invention includes a plurality of plate parts arranged in a first direction, extending in a second direction, and thermally contacting transmission / reception elements of the active antenna; An inlet header portion extending in a first direction and communicating with one end of the plate portion; An outlet header portion extending in a first direction and communicating with the other end portion of the plate portion; And a cooling fluid circulation part for supplying cooling fluid to the plate part and recovering the cooling fluid from the plate part through the inlet header part and the outlet header part, wherein the inlet header part is based on the flow of the cooling fluid. The cross-sectional area of the upstream section is smaller than the cross-sectional area of the downstream section, the outlet header portion has a larger cross-sectional area of the upstream section, and the plate portion has a single flow path extending and refracted a plurality of times in the second and third directions. Is formed.

A heat dissipating device of an active antenna according to an embodiment of the present invention includes a plurality of plate parts arranged in a first direction, extending in a second direction, and thermally contacting transmission / reception elements of the active antenna; An inlet header portion extending in a first direction and communicating with one end of the plate portion; An outlet header portion extending in a first direction and communicating with the other end portion of the plate portion; And a cooling fluid circulation part for supplying cooling fluid to the plate part and recovering the cooling fluid from the plate part through the inlet header part and the outlet header part, wherein the inlet header part is based on the flow of the cooling fluid. The cross-sectional area of the upstream section is smaller than the cross-sectional area of the downstream section, the outlet header portion has a larger cross-sectional area of the upstream section, the component of the cooling fluid includes an antifreeze, and the material of the plate section contains a metal.

Assuming that the cross-sectional areas of the inlet header portion and the outlet header portion are constant in the first direction, assuming that the flow rate of the cooling fluid flowing therein is the plate portion closest to the intermediate value, the upstream section and the downstream section are the reference plate. It can be defined based on the plate.

The reference plate may communicate with the upstream section, and the reference plate may introduce and discharge a cooling fluid through the upstream section.

The transceiving elements may be disposed on both sides of the plate part in a first direction, and the transceiving elements may be arranged in a lattice form on the both sides.

The grating shape is a two-dimensional grating shape in the second direction and the third direction, and a single flow path may be formed in the plate part along the grating shape.

The inlet header part and the outlet header part may be spaced apart in the second direction, and the plate part may connect the inlet header part and the outlet header part in the second direction between the inlet header part and the outlet header part.

The flow of the cooling fluid of the inlet header part and the flow of the cooling fluid of the outlet header part with respect to the first direction may be formed in the same direction.

The plate part may have a length in a second direction greater than a width in a third direction, and a width in a third direction may be greater than a thickness in a first direction.

Each of the inlet header part and the outlet header part may have a length in the first direction greater than a diameter in the second and third directions.

Diameters of the inlet header portion and the outlet header portion may be smaller than the width of the plate portion and larger than the thickness of the plate portion.

The single flow path includes at least three extension sections and at least two refracting sections, the number of the extending sections increases to an odd number, the number of the refraction sections increases to an even number, and the flow cross section has a rectangular shape. It may include.

The antifreeze may comprise ethylene glycol.

The metal may comprise aluminum.

An active antenna according to an embodiment of the present invention includes a plurality of radiating elements for radiating an RF signal into free space; A plurality of transmission / reception elements for controlling the magnitude and phase of the RF signal fed to the radiation element; A plurality of housings in which the transceiving element is accommodated; And the heat dissipation device in thermal contact with the transceiving element through the housing.

According to the embodiment of the present invention, the transmission / reception elements of the active antenna can be smoothly cooled to a desired temperature. In detail, the cooling fluid can be smoothly cooled to a desired temperature by appropriately concentrating the cooling fluid in the plate while supplying the cooling fluid appropriately branched to the plurality of plate parts for cooling the transmission / reception elements. . That is, the flow rate variation of the cooling fluid between the plurality of plate parts can be minimized, and the flow rate of the cooling fluid allocated to each transmission / reception element in the plate part can be maximized. Therefore, by supplying a large amount of cooling fluid to the transmission and reception elements as uniformly as possible, it is possible to smoothly cool the temperature of the transmission and reception elements to a desired temperature.

From this, it is possible to maintain the temperature of the transmitting and receiving elements at a temperature at which the transmitting and receiving elements can stably operate when the active antenna is operated. That is, the thermal reliability of the active antenna can be increased, and the stable mission of the active antenna can be performed.

1 is a schematic diagram of an active antenna according to an embodiment of the present invention.
2 is a schematic diagram of a heat radiation device of an active antenna according to an embodiment of the present invention.
3 is a schematic view of a plate portion according to an embodiment of the present invention.
4 is a schematic diagram of an inlet header unit according to an exemplary embodiment of the present invention.
5 is a schematic diagram of an outlet header part according to an exemplary embodiment of the present invention.
6 is a schematic diagram of a single flow path according to an embodiment of the present invention.
7 to 23 are views for explaining a method of designing a heat radiation device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described an embodiment of the present invention; However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. Only embodiments of the present invention are provided to complete the disclosure of the present invention and to fully inform the scope of the invention to those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS The drawings may be exaggerated to illustrate embodiments of the invention, and like reference numerals designate like elements in the drawings.

The heat dissipation device of the active antenna (hereinafter referred to as a “heat dissipation device”) according to an embodiment of the present invention may appropriately branch and distribute the cooling fluid so as to effectively cool the high-performance and high-heat transmitting / receiving elements included in the active antenna. . Thus, the heat dissipation device can maintain the temperature of the transmitting and receiving elements at a temperature at which the transmitting and receiving elements can operate stably. That is, the heat dissipation device can increase the thermal reliability of the active antenna. From this it is possible to perform a stable mission of the active antenna.

1 is a schematic view of an active antenna according to an embodiment of the present invention, FIG. 2 is a schematic view of a heat dissipation device according to an embodiment of the present invention, and FIG. 3 is a schematic view of a plate unit according to an embodiment of the present invention. 4 is a schematic view of an inlet header part according to an embodiment of the present invention, FIG. 5 is a schematic view of an outlet header part according to an embodiment of the present invention, and FIG. 6 is a schematic view of a single flow path according to an embodiment of the present invention.

1 to 3, an active antenna according to an embodiment of the present invention will be described.

Active antenna 1 according to an embodiment of the present invention, a plurality of radiating elements 10 for transmitting and receiving RF signals through the free space, a plurality of transmitting and receiving modules 20 for performing electronic beam steering of the radiating element 10 , And a heat dissipation device 300 for cooling the transmission / reception module 20.

The radiation element 10 may be tens to tens of thousands. The radiation elements 10 may be arranged in a predetermined pattern. The radiation element 10 may radiate an RF signal into free space. In addition, the radiation element 10 may receive an RF signal radiated into free space. The RF signal may be referred to as electromagnetic waves or radio waves.

The transmission and reception module 20 may be several tens to tens of thousands. The transmission and reception module 20 is arranged in the form of a checkerboard or grid to perform its function. The transmission / reception module 20 may be connected to the radiation element 10. The transmission / reception module 20 may correspond one-to-one with the radiation element 10. The transceiver module 20 may be in contact with the heat dissipation device 300. The transceiver module 20 may be cooled by the heat dissipation device 300.

The transmission / reception module 20 may include a plurality of transmission / reception elements 21 for controlling the magnitude and phase of the RF signal fed to the radiation element 10, and a housing 22 in which the transmission / reception element 21 is accommodated.

The transceiving element 21 may be implemented as a semiconductor element. The transceiver 21 may receive an RF signal, electronically control the magnitude and phase of the RF signal, and transmit the RF signal to the radiation element 10. Thus, the electronic beam steering of the RF signal radiated into the free space in the radiation element 10 may be performed. The transceiving element 21 may be mounted on a circuit board. The circuit board may be accommodated in the internal space of the housing 22.

The transceiving element 21 may generate heat. The transceiving element 21 may be referred to as a heat source or a heating source. If the heat generated from the transmission / reception element 21 is not removed, the thermal density of the transmission / reception element 21 becomes high, and a malfunction of the transmission / reception element 21 may occur or the transmission / reception element 21 may be damaged.

The housing 22 may be, for example, hexahedral in shape. Of course, the shape of the housing 22 may vary. The housing 22 may contact the heat dissipation device 300. Through the housing 22, heat of the transceiving element 21 may be transferred to the heat dissipation device 300.

The heat dissipation device 300 may be in thermal contact with the housing 22 and the transceiving element 21. Specifically, the heat dissipation device 300 may be in thermal contact with the transceiving element 21 through the housing 22. The heat dissipation device 300 may effectively dissipate heat of the transceiving element 21, which is a high heat generating unit, with a cooling fluid by using a cooling fluid, and may satisfy the thermal performance of the active antenna 1. The cooling fluid may be in a liquid state. That is, the heat dissipation device 300 may smoothly dissipate heat of the transmission / reception element 21 by the liquid cooling method. This heat dissipation device 300 may be referred to as a liquid cooling system of an active antenna.

When the active antenna 1 satisfies the thermal requirements, it is expressed that the thermal performance of the active antenna 1 is good. The thermal requirements of the active antenna 1 include conditions where the temperature of the transmitting and receiving elements 21 in operation is lower than the reference temperature, the temperature deviation of the operating transmitting and receiving elements 21 is lower than the reference temperature deviation, and the operating transmitting and receiving element 21 ), The temperature distribution of) corresponds to the negative parabola shape.

The reference temperature means the highest temperature among the temperatures of the transmitting and receiving element 21 capable of the normal operation of the active antenna 1. In addition, the reference temperature deviation refers to a temperature deviation between the highest temperature and the lowest temperature among the temperatures of the transmitting and receiving element 21 capable of the normal operation of the active antenna 1.

In addition, the temperature distribution of the transmitting and receiving elements 21 means the temperature distribution of the transmitting and receiving elements 21 in a direction in which the plurality of plate portions 310 described later are arranged.

Specifically, the main elements of the transmission and reception elements 21 are selected for each plate portion 310, the order of the plurality of plate portions 310 is the horizontal axis of the graph, and the temperature of the main elements is the vertical axis of the graph. When the two-dimensional graph is shown, the shape of the graph is called a temperature distribution of the transmitting and receiving elements 21.

A negative parabolic shape means that the shape of the graph is generally symmetrical from side to side, with its center convex up and its periphery convex down.

The active antenna 1 can operate most smoothly when all of the above-described thermal requirements are satisfied. Smooth operation means that the error between the desired beam emission angle and the actual beam emission angle of the active antenna 1 can be minimized.

1 to 6, the heat dissipation device 300 according to an embodiment of the present invention will be described in detail.

The heat dissipation device 300 according to the embodiment of the present invention is arranged in the first direction X, extends in the second direction Y, and thermally contacts the transmission / reception elements 21 of the active antenna 1. A plurality of plate portions 310, extending in the first direction X, inlet header portions 320 communicating with one end of the plate portion 310, extending in the second direction Y, and the plate portion ( Cooling fluid is supplied to the plate portion 310 through the outlet header portion 330, the inlet header portion 320, and the outlet header portion 330 in communication with the other end of the 310, and is cooled in the plate portion 310. The cooling fluid circulation unit 340 for recovering the fluid.

The cooling fluid flows inside the inlet header part 320 and the outlet header part 330, and the friction fluid flows from the upstream section Du to the downstream section Dd on the basis of the flow of the cooling fluid. Energy is lost and pressure is lowered. Thus, the inlet header portion 320 and the outlet header portion 330 are not provided in the flow distribution optimization structure described below. For example, the cross-sectional area of the inlet header portion 320 and the outlet header portion 330 is in the first direction X. FIG. If constant, the cooling fluid is linearly differentially distributed to the plurality of plate portions 310. In this case, the cooling fluid cannot smoothly cool the transmission / reception elements 21 and cannot satisfy the thermal performance of the active antenna 1.

Therefore, based on the flow of the cooling fluid of the inlet header 320 and the outlet header 330, the inlet header 320 has a cross-sectional area of the upstream section Du is smaller than the cross-sectional area of the downstream section Dd, the outlet The header portion 330 may have a larger cross-sectional area of the upstream section Du than a cross-sectional area of the downstream section Dd. The structures of the inlet header 320 and the outlet header 330 are referred to as flow distribution optimization structures. Meanwhile, in order to be distinguished from the flow distribution optimization structure described above, a structure in which the cross-sectional areas of the inlet header 320 and the outlet header 330 are constant along the first direction X is called a flow distribution linear increase / decrease structure.

By the flow distribution optimization structure, it is possible to supply the cooling fluid relatively uniformly to each of the plurality of plate portions 310 to smoothly cool the transmission / reception elements 21 as a whole, and to improve the thermal performance of the active antenna 1. have.

Here, when the cross-sectional area of at least one of the inlet header portion 320 and the outlet header portion 330 is constant, the plurality of plate portions through the inlet header portion 320 and the outlet header portion 330 may be relatively uniform. 310, it means that the cooling fluid is uniform as compared with the differential distribution.

That is, in the embodiment of the present invention, by the above-described structure of the inlet header 320 and the outlet header 330, the cooling fluid circulation section 340 and the plate portion 310 of the upstream section (Du) The cooling fluid of a suitable temperature may be distributed evenly to the plate portions 310 of the downstream section Dd. Through this, the plurality of plate parts 310 may perform heat dissipation of the transceiving elements 21 considering the thermal performance of the active antenna 1.

Meanwhile, the flow of the cooling fluid of the inlet header 320 and the flow of the cooling fluid of the outlet header 330 in the first direction X may be formed in the same direction. That is, when the cooling fluid flows from left to right in the inlet header part 320, the cooling fluid may flow from left to right in the outlet header part 330.

In order to facilitate describing embodiments of the present invention, directions are defined as follows. The first direction X, the second direction Y, and the third direction may be directions crossing each other. The first direction X may be left and right, and the second direction Y may be up and down. The third direction Z may be a front-rear direction. Of course, these directions can be defined in various ways.

To facilitate describing the embodiments of the present invention, terms are defined as follows. Upstream means the point or portion where the cooling fluid passes relatively first. And downstream means the point or portion where the cooling fluid passes relatively later.

Hereinafter, the structural part of the heat radiating apparatus 300 is demonstrated in detail in order.

The plate portion 310 may be provided in plurality. The plate part 310 may be arranged in the first direction X. The plate portion 310 may extend in the second direction (Y). The plate 310 may be in thermal contact with the transceiving elements 21 of the active antenna 1.

The plate 310 may be provided with the transmission and reception elements 21 on both sides of the first direction (X). In detail, the plurality of housings 22 may be disposed on both sides of the plate 310, and the plurality of transmission / reception elements 21 may be accommodated in each housing 22. As such, the plurality of transmission / reception modules 20 may be in thermal contact with each plate 310.

Here, a plurality of housings 22 may be disposed on each of the above-described both side surfaces of the plate part 31, and may be arranged in the second direction Y. FIG. The transmitting and receiving elements 21 may be arranged in a lattice form on each of the above-described both sides of the plate portion 31. In this case, the lattice shape may be a two-dimensional lattice shape with respect to the second direction Y and the third direction.

The above-described two side surfaces of the plate part 310 refer to surfaces facing each other in the first direction X. FIG. Both sides of the plate 310 may be referred to as left and right sides of the plate 310.

The plate 310 may connect the inlet header 320 and the outlet header 330 in the second direction Y between the inlet header 320 and the outlet header 330. One end of the plate 310 connected to the inlet header 320 is called an inlet side end or an upper end, and the other end of the plate 310 connected to the outlet header 330 is called an outlet side end or a lower end. .

The plate part 310 has a cooling plate 311 in which the length of the second direction Y is greater than the width of the third direction Z, and the width Z of the third direction is larger than the thickness of the first direction X. ), And a single flow path 312 formed in the cooling plate 331 along a lattice form in which the transmitting and receiving elements 21 are arranged.

The material of the cooling plate 311 may include a metal material. In this case, the metal may include aluminum. Of course, the material of the cooling plate 311 may include various metals and alloy materials thereof. The cooling plate 311 may transfer the heat generated by the transceiving element 21 to the cooling fluid flowing inside the single flow path 312.

The thickness of the cooling plate 311 may be smaller than the diameter of the inlet header portion 320 and the outlet header portion 330. The width of the cooling plate 311 may be larger than the diameter of the inlet header 320 and the outlet header 330. The diameter can be a maximum, minimum or average diameter. The cooling plate 311 may be several tens of millimeters thick, hundreds of millimeters wide, and several meters long.

The single channel 312 may be formed to penetrate the inside of the cooling plate 311, or may have a structure in which a separate cooling tube is inserted into the cooling plate 311. As such, the single channel 312 may be integrated with the cooling plate 311, or the cooling plate 311 and the single channel 312 may be in a form in which separate members are coupled to each other. When the single channel 312 is a separate cooling tube, the material of the single channel 312 may be the same as that of the cooling plate 311.

The single flow passage 312 has one end, for example, an inlet, which passes through an inlet side end of the cooling plate 311, and communicates with the inlet header 320, and the other end, for example, an outlet, passes through the outlet side end of the cooling plate 311. It may be in communication with the outlet header portion 330. The single channel 312 may receive a cooling fluid from the inlet header 320 and discharge the cooling fluid to the outlet header 330.

On the other hand, the inner surface of the single flow path 312 may be provided with a fin. For example, the fin may protrude from the inner surface of the single channel 312, and the fin may extend along the direction in which the single channel 312 extends. Of course, the shape of the fin can vary, for example, spiral.

The single channel 312 may be extended and refracted a plurality of times in the second direction Y and the third direction Z within the cooling plate 311. For example, the single channel 312 may be formed in an S shape. The single channel 312 includes a plurality of extension sections 312a extending in the second direction Y and a plurality of refraction sections 312b refracted in the third direction Z at the ends of the extension sections 312a. can do.

The single channel 312 may include at least three extension sections 312a and at least two refractive sections 312b. The number of extension sections 312a may increase in an odd number, and the number of refractive sections 312b may increase in an even number. The single flow path 312 may have a rectangular cross-section in its flow cross section.

By the structure of the single flow path 312 described above, the cooling fluid in the cooling plate 311 is appropriately concentrated in the cooling plate 311 along the lattice form in which the transmitting and receiving elements 21 are arranged, thereby allowing the transmission / reception element in the cooling plate 311. 21) It is possible to maximize the flow rate of the cooling fluid assigned to each. Thus, the temperature of the transmitting and receiving elements 21 can be cooled to a desired temperature.

In the embodiment of the present invention, the number of plate portions 310 is referred to as N, and the number of plate portions 310 positioned in the upstream section Du among them is referred to as K pieces. That is, K plate portions 310 are listed in the upstream section Du, and N-K plate portions 310 are listed in the downstream section Dd.

The order of the plate part 310 is based on the direction from the upstream section Du to the downstream section Dd, and in the upstream section Du, the first plate section # 1 through which the cooling fluid passes first. ), And the K-th plate portion through which the cooling fluid passes last in the upstream section Du is called the K-th plate portion #K. The K + 1 th plate portion through which the cooling fluid passes first in the downstream section Dd is called the K + 1 plate portion (# K + 1), and the cooling fluid is N-1-K th in the downstream section Dd. The plate portion passing through is referred to as the N-th plate portion # N-1, and the N-th plate portion through which the cooling fluid passes last in the downstream section Dd is referred to as the N-plate portion #N. The K-th plate part #K is a reference plate to be described later, and communicates with the upstream section Du, and allows the cooling fluid to flow in and out through the upstream section Du.

The inlet header part 320 may extend in the first direction X. FIG. The inlet header part 320 may have a length of the first direction X greater than a diameter of the second direction Y and the third direction Z. FIG. In addition, the inlet header 320 may have a diameter smaller than the width of the plate 310 and greater than the thickness of the plate 310. In this case, the length of the inlet header 320 may be a few meters, the diameter may be several tens of mm.

The inlet header part 320 may be positioned above the plurality of plate parts 310. The inlet header portion 320 may contact and communicate with one end of the plate portions 310. The inlet header 320 may be connected to the cooling fluid circulation part 340 at an upstream end thereof. The upstream end may be referred to as the left end.

The inlet header part 320 may receive the cooling fluid from the cooling fluid circulation part 340, and supply the cooling fluid to the plurality of plate parts 310. Here, based on the flow of the cooling fluid, the inlet header 320 has a cross-sectional area of the upstream section Du is smaller than the cross-sectional area of the downstream section Dd. By this structure, the cooling fluid flowing inside the inlet header 320 may lower the flow pressure in the upstream section Du, and recover the flow pressure in the downstream section Dd. On the other hand, the cross-sectional area refers to the flow cross-sectional area of the cross section, for example, cross section, which crosses the first direction (X) that is the direction in which the cooling fluid flows inside the inlet header portion (320).

The outlet header part 330 may extend in the first direction X. FIG. The length of the outlet header part 330 may be greater than the diameter of the second direction Y and the third direction Z. The outlet header portion 330 may have a diameter smaller than the width of the plate portion 310 and larger than the thickness of the plate portion 310. In this case, the length of the outlet header portion 320 may be several meters, the diameter may be several tens of mm.

The outlet header part 330 may be spaced apart from the inlet header part 320 in the second direction (Y). The outlet header part 330 may be located under the plurality of plate parts 310. The outlet header part 330 may contact and communicate with the other ends of the plate parts 310. The outlet header part 330 may have a downstream end connected to the cooling fluid circulation part 340. The downstream end may be referred to as the right end.

The outlet header part 330 may recover the cooling fluid discharged from the plurality of plate parts 310 and supply it to the cooling fluid circulation part 340. At this time, based on the flow of the cooling fluid, the outlet header portion 330 has a larger cross-sectional area of the upstream section Du than a cross-sectional area of the downstream section Dd. In this case, the cross-sectional area means a flow cross-sectional area of a cross section, such as a cross section, that crosses the first direction X, which is a direction in which the cooling fluid flows in the outlet header part 330.

By this structure, the cooling fluid flowing inside the outlet header portion 330 can relatively increase the flow pressure in the upstream section (Du), and can relatively lower the flow pressure in the downstream section (Dd).

As the structure of the inlet header 320 and the outlet header 330 is formed as described above, through the inlet header 320 and the outlet header 330, a plurality of plate fluids 310 to the cooling fluid It can be supplied by branching relatively uniformly. Therefore, the flow rate variation between the plurality of plate portions 310 can be minimized.

When the flow rate variation between the plurality of plate portions 310 is minimized, the temperature distribution of the transmission / reception elements 21 cooled by the plurality of plate portions 310 may correspond to a negative parabolic shape, and The temperature may be lower than the reference temperature, and the temperature deviation of the transmitting and receiving elements 21 may be lower than the reference temperature deviation. Accordingly, the plurality of transmission and reception elements 21 may be stably operated to control the actual beam emission angle of the radiation elements 10 to the desired beam emission angle.

The above-described upstream section Du and the downstream section Dd may be defined based on the reference plate. First, the process of determining the reference plate is as follows.

It is assumed that the cross-sectional areas of the inlet header 320 and the outlet header 330 are constant in the first direction X. FIG. While supplying the cooling fluid to the plurality of plate portions 310 through the inlet header portion 320 and the outlet header portion 330, the flow rate value of the cooling fluid flowing through each of the plurality of plate portions 310 is obtained. Specifically, the heat dissipation device according to the comparative example in which the cross-sectional areas of the inlet header 320 and the outlet header 330 are constant in the first direction X is modeled, and after inputting predetermined analysis conditions, the computational fluid dynamics is calculated. Using this, the flow rate value of the cooling fluid flowing inside each of the plurality of plate portions 310 is obtained. And the plate part whose calculated | prescribed flow volume value is closest to an intermediate value is set as a reference plate.

As described above, in the embodiment of the present invention, the reference plate is determined by considering the flow of the cooling fluid instead of simply defining the middle plate part as the reference plate structurally or geometrically. Accordingly, the structural design of the inlet header 320 and the outlet header 330 for distributing the cooling fluid as uniformly as possible can be smoothly performed.

When the reference plate is determined, the upstream section Du and the downstream section Dd may be defined. Specifically, the predetermined section between the reference plate and the next plate is defined as the midstream section Dm. In this case, the next plate refers to a plate part closest to the reference plate among the plate parts spaced apart in the direction in which the cooling fluid flows from the reference plate.

Next, the upstream section Du is determined from the upstream end of the inlet header section 320 and the outlet header section 330 before the midstream section Dm. In addition, after the midstream section Dm, upstream ends of the inlet header part 320 and the outlet header part 330 are defined as the downstream section Dd. The midstream section Dm may have a diffuser shape. Of course, the shape may vary.

The degree of flow distribution to be described later to the plurality of plate portions 310 according to the size relationship between the cross-sectional area of the upstream section Du and the cross-sectional area of the downstream section Dd of each of the inlet header section 320 and the outlet header section 330. May vary.

For example, when the size of the reference cross-sectional area of the inlet header 320 and the outlet header 330 is D, the size of the cross-sectional area of the upstream section Du of the inlet header 320 and the outlet header 330 is equal to D. The size of the cross-sectional area of the downstream section Dd may be greater than D. In more detail, the size of the cross-sectional area of the downstream section Dd may be 1.6D.

Alternatively, when the size of the reference cross-sectional area described above is D, the size of the cross-sectional area of the upstream section Du may be smaller than D, and the size of the cross-sectional area of the downstream section Dd may be larger than D. Specifically, the size of each cross-sectional area may be 0.8D and 1.6D.

Here, the size D of the reference cross-sectional area may be equal to a value calculated by summing the flow cross-sectional areas of the single flow path 320 of each of the plurality of plate portions 310. For example, the size D of the reference cross-sectional area is equal to the sum of the flow cross-sectional areas of the single flow paths 320 respectively provided in the plurality of plate portions 310.

By the above-described size relationship, the degree of flow rate distribution between the plurality of plate portions 310 may be close to zero. In this case, as the cooling fluid is uniformly distributed to the plurality of plate portions 310, the degree of flow rate distribution becomes closer to zero, and as the cooling fluid is linearly differentially distributed to the plurality of plate parts 310, the degree of flow rate distribution is zero. Away from That is, the cooling fluid may be distributed to the plurality of plate portions 310 as uniformly as possible.

The cooling fluid circulation part 340 may supply cooling fluid to the plate part 310 through the inlet header part 320 and the outlet header part 330, and recover the cooling fluid from the plate part 310. The cooling fluid circulation part 340 receives the cooling fluid and cools it to a desired temperature, and supplies the cooling fluid discharged from the cooler 341 and the inlet header part 320 to be discharged again. The supply unit 342, the recovery unit 343 for recovering the cooling fluid from the outlet header portion 330 to the cooler 341, the cooler 341 and the feeder 342 and recovery unit 343 are connected, It may include a rotary joint 344 that controls the overall flow. The configuration and manner of the cooling fluid circulation unit 340 may be various in addition to this.

The cooling fluid may include various refrigerants capable of smoothly cooling the transmission / reception element 21. The component of the cooling fluid may comprise an antifreeze. At this time, the antifreeze may comprise ethylene glycol. That is, the cooling fluid may be an aqueous solution of ethylene glycol.

According to an embodiment of the present invention, the cooling fluid flows into the inlet header part 320 through the cooling fluid circulation part 340, and then is appropriately branched to each plate part 310 in the inlet header part 320, The heat is recovered from the transceiving element 21 while passing through the flow path 312. The cooling fluid is recovered to the cooling fluid circulation part 340 through the outlet header part 330, and then cooled to flow into the inlet header part 320 again. The heat dissipation device 300 may repeatedly perform this heat dissipation function.

7 to 23 are views for explaining a method of designing a heat radiation device according to an embodiment of the present invention.

7 to 15 are views for explaining a preliminary design process of a heat dissipation device according to an embodiment of the present invention, Figures 16 to 18 are views for explaining an optimization design process of a heat dissipation device according to an embodiment of the present invention. to be. 19 to 23 are views for explaining a thermal analysis process according to an embodiment of the present invention.

Hereinafter, referring to FIGS. 1 to 23, a design method (also referred to as a 'heat radiating design method for an active antenna') according to an exemplary embodiment of the present invention will be described.

In the method of designing a heat dissipation device according to an embodiment of the present invention, a process of determining a design target, a shape of a plate for heat dissipation of a heat source, a numerical analysis of the performance of a shape-designed plate, and the shape of the plate is determined according to the result. Preliminary design process, the shape design of the header portion for cooling fluid circulation, the numerical design analysis of the performance of the shape-designed header portion, and the optimization design process of determining the shape of the header portion according to the result, and the performance of the shape plate and the header portion Numerical analysis is included and thermal analysis is performed to compare the results with design goals.

Determine design goals. Specifically, the thermal requirements for smooth performance of the active antenna 1 is determined as a design goal.

In the case of liquid cooling, the heat dissipation temperature of the heating source is sensitive depending on physical characteristics such as the temperature and flow rate of the cooling fluid, so the thermal requirements must be accurate.

Examples of thermal requirements are listed in Table 1 below.

Requirements Remarks Max. Temp. <Ｔ ℃ Max. Temp. of Chips ΔＴ <ΔＴ ℃ Max. Temp. － Min. Temp. Temperature distribution Shape Negative Parabola

Referring to Table 1, the temperature of the transmission and reception elements 21 is lower than the reference temperature, the temperature deviation of the transmission and reception elements 21 is lower than the reference temperature deviation, and the temperature distribution of the transmission and reception elements 21 is in a negative parabolic shape. Determine matching conditions as design goals.

The heat dissipation device 300 is designed to satisfy these thermal requirements.

The reference temperature means the highest temperature among the temperatures of the transceiver element 21 capable of normal operation. The reference temperature is also called the required temperature. The reference temperature deviation means a deviation between the highest temperature and the lowest temperature among the temperatures of the transceiver element 21 capable of normal operation. The reference temperature deviation is also called the required temperature deviation.

The temperature distribution is a horizontal axis of the order of the plurality of plate portion 310, the temperature of the selected major elements of the plurality of transmitting and receiving elements 21 in each plate portion 310 as the vertical axis, a two-dimensional graph When shown, it means the shape of the graph.

That is, the shape of the graph when the temperature of the selected major elements of the plurality of transceiving elements 21 is shown in a two-dimensional graph along the direction in which the plate 310 is arranged is a temperature distribution.

A negative parabolic shape means that the shape of the graph is generally symmetrical from side to side, with its center convex upward and its periphery convex downward.

Then, the shape of the plate for heat dissipation of the heat source, the numerical analysis of the performance of the shape-designed plate portion, the shape of the plate portion is determined according to the result.

The active antenna 1 may be arranged in a transmission / reception module 20 to meet a predetermined task. Based on the arrangement of the predetermined transmission and reception module 20, the outer shape of the plate 310 is designed. For example, the plate portion 310 is shaped into a rectangular plate shape having a thickness of several tens of mm, a width of several hundreds of mm, and a length of several m.

When the arrangement of the transmission / reception module 20 is determined in advance and the outer shape of the plate 310 is shaped, the heat generation temperature and the plate 310 of the transmission / reception module 20 in thermal contact with the plate 310 are radiated. The amount of heat to be made can be known, and the flow rate of the cooling fluid required for heat dissipation can be known. The flow path of the plate part 310 is designed based on the flow rate of the cooling fluid required for the arrangement and heat dissipation of the transmission / reception module 20. For example, various shapes of flow paths having a predetermined flow cross-sectional area and passing through a plurality of columns along the arrangement pattern of the transceiving elements 21 are designed.

Numerically analyze the performance of the designed plate portion 310. In this case, the numerical analysis may use FLOW-3D v11, which is a three-dimensional commercial computational fluid analysis code. In the numerical analysis, the thermal characteristics and the pressure characteristics of the plate 310 may be analyzed. At this time, the following analysis conditions are used.

7 is a view showing a heat dissipation path. The heat dissipation path between the transmitting and receiving element 21 and the plate portion 310 may include a circuit board 23, a thermally conductive grease (not shown), a high power amplifier board carrier 24, a thermally conductive grease (not shown), and the like. It may be formed of a housing 22.

The total thermal resistance of the heat dissipation path can be obtained by the sum of the thermal resistances of each of the circuit board 23, the thermally conductive grease, the high power amplifier board carrier 24, the thermally conductive grease and the housing 22.

At this time, the thermal resistance of the thermally conductive grease is inversely proportional to the thermal conductivity of the thermally conductive grease and the area where the thermally conductive grease is applied, and is proportional to the thickness of the thermally conductive grease.

On the other hand, the contact thermal resistance between the housing 22 and the plate portion 310 is inversely proportional to the heat transfer coefficient and the contact area, and is proportional to the contact surface gap (thickness). At this time, it can be assumed that the thermal resistance of the thermally conductive grease has a value smaller than the contact thermal resistance between the housing 22 and the plate portion 310.

For accurate numerical analysis, the contact thermal resistance was experimentally derived by reflecting the contact surface roughness and the contact pressure of the housing 22 and the plate portion 310.

The total heat resistance of the heat dissipation path is obtained in the manner described above and used for numerical analysis.

FIG. 8A is a diagram illustrating a transmission / reception module portion of a computational fluid dynamics model (hereinafter, referred to as a model) for numerical analysis, and FIG. 8B is a diagram illustrating a portion of a flow path of the model. FIG. 8C is a diagram illustrating a part of a plate part of the model by way of example. In the drawings, the grid of the model is omitted.

Computational fluid dynamics model for numerical analysis is modeled as shown in (a), (b) and (c) of FIG. At this time, in order to confirm the lattice number suitable for the numerical analysis, the thermal analysis of the model was performed while changing the lattice number of the model, and the maximum temperature of the resulting model was graphically illustrated as shown in FIG. 9.

9, the thermal analysis results converge at a constant value in more than 7 million lattice numbers. Accordingly, in the embodiment of the present invention, modeling and numerical analysis are performed using 8 million hexagonal grids.

10 shows boundary conditions to be used for numerical analysis. The numerical analysis uses the normal analysis and the turbulence model uses the κ-ε model. The κ-ε model is widely used in the field of commercial heat transfer analysis with relatively accurate analysis results and fast calculation speed.

In an embodiment of the present invention, a turbulence model suitable for relatively accurate analysis results, various case analysis, and excellent convergence in a wide three-dimensional analysis domain is selected and performed.

11 is a diagram showing a flow path shape used for numerical analysis. 2Row is a two-row branch, 3Row is a three-row branch, and S is an S-type single flow path. A value of 15 mm in cases 4 and 5 means a change in position. The remaining boundary conditions other than the flow path shape are the same, and numerical analysis is performed. At this time, the influence on the type of cooling fluid and the positional change of the flow path are examined. Here, there are two types of cooling fluids used in the numerical analysis, EGW 60% solution and PAO.

12 to 15 are diagrams showing the results of the above-described numerical analysis.

12 is a diagram illustrating a temperature distribution of the transmitting and receiving elements 21 on the plate portion 310 by way of example. 13 and 14 are graphs illustrating the temperature difference between the highest temperature, the highest temperature, and the lowest temperature among the temperatures of the transceiving elements 21 on the plate 310 according to the type, flow path type, and location of the cooling fluid, respectively. One drawing.

FIG. 14 is a graph illustrating pressure loss of the flow path according to the type of cooling fluid, the flow path shape, and the location.

Looking at the thermal characteristics and pressure characteristics of the plate portion 310 derived from the numerical analysis, first, the single flow path has the largest pressure loss. However, despite the pressure loss, the heat dissipation performance is best with the S-type single channel. And the type of cooling fluid can be seen that the high specific heat EGW 60% solution is superior to PAO. In addition, it can be seen that the change in position of the cooling passage does not significantly affect the heat dissipation performance.

Therefore, the shape of the plate portion 310 determines that a rectangular plate shape having a thickness of several tens of mm, a width of several hundreds of mm, a length of several meters, and an S-shaped single flow path having a predetermined flow cross-sectional area is formed therein.

After that, the shape of the header portion for cooling fluid circulation is designed, the performance of the shaped header portion is numerically analyzed, and the shape of the header portion is determined according to the result.

Since the temperature distribution of the transmission / reception element 21 and the temperature distribution of the transmission / reception element 21 in the direction in which the plate portion 310 is listed directly affect the performance of the active antenna 1, the cooling fluid to the plate portion 310 is controlled. Flow distribution is important.

The flow resistance of the plate part 310 for the flow distribution analysis is analyzed by three-dimensional computational fluid dynamics, and the one-dimensional analysis is applied to the flow path system analysis. One-dimensional analysis uses FLOW MASTER v8, a commercial computational fluid analysis code.

16 is an analysis model for one-dimensional analysis. Reference numeral 41 is an analysis element indicating the pressure loss due to the shape of the inlet header portion and the flow rate distribution, 42 is an analysis element indicating the pressure loss of the cooling fluid due to friction, flow resistance, etc. while passing through a single flow path of the plate portion, Reference numeral 43 is an analysis element indicating the pressure loss due to the flow rate is joined in the outlet header portion. The flow resistance in the plate part is analyzed by applying the 3D analysis result.

The flow rate of the cooling fluid flowing into the plate portion is determined by the inlet and outlet pressures of the single passage of the plate portion. In order to determine the shape of the header portion capable of uniformly distributing the flow rate in consideration of the inlet and outlet pressures of the single flow path of the plate portion, the header portion is shaped in four ways as shown in FIG. In the drawing, D means a reference cross-sectional area, the basic design and case 1 correspond to comparative examples of the present invention, and case 2 and case 3 correspond to embodiments of the present invention. In shape design, the design factor is the cross-sectional area of the header. The cross-sectional area of the header portion varies the cross-sectional area of the header portion from a minimum of 0.8D to a maximum of 1.6D based on the value D of the reference cross-sectional area described above.

The objective function for determining the shape of the header portion is shown in [Equation 1] below.

[Equation 1]

는 입구 헤더부(320)를 통하여 복수개의 플레이트부(310)로 공급되는 냉각유체의 총 유량을 플레이트부(310)의 개수로 나눈 평균 유량이다.Here, Φ is a value indicating the degree of flow rate distribution, N is the number of plate portion 310, i is the order of the plate portion 310, Q is the flow rate of the cooling fluid,

Denotes an average flow rate of the total flow rate of the cooling fluid supplied to the plurality of plate parts 310 through the inlet header part 320 divided by the number of plate parts 310.

Here, the closer the value of the objective function is to 0, the more uniform the flow distribution.

18 is a result of the numerical analysis of the model of the comparative examples and embodiments of the present invention, the horizontal side represents the order of the plate portion, the vertical side represents the flow rate.

Referring to FIG. 18, in the case of the comparative examples, it can be seen that the flow rate changes linearly according to the order of the plate parts. In this case, since the temperature of the transmitting / receiving element also varies linearly in accordance with the order of the plate portion, it may cause a large error in the beam radiation angle of the active antenna 1.

On the other hand, in the case of the embodiment, it can be seen that the difference between the flow rate of the first plate portion and the flow rate of the last plate portion is greatly narrowed. That is, it can be seen that the flow rate distribution becomes relatively uniform. In the embodiment of the present invention, the shape of the header part is determined as the case 2 and the case 3 shown in FIG. 17 based on the analysis result.

Thereafter, the performance of the shaped plate and header portions is numerically analyzed, and the results are compared with the design goals.

19 and 20 are diagrams illustrating a numerical analysis model for performing thermal analysis of an active antenna to which a shaped plate portion and a header portion are applied.

Numerical analysis is performed using the model shapes of the plate and header sections derived through the series of processes described above, and analysis conditions such as the flow rate conditions optimized in the series of processes described above, and the results are compared with the design goals. Check the thermal performance of the antenna. The computational grid used for the numerical analysis is a hexagonal alignment grid and the number is about 53.5 million.

21 shows results of numerical analysis using model shapes and analysis conditions according to the comparative examples. Rows 1 to 7 of FIG. 21 indicate major elements selected from transmission and reception elements, respectively. Referring to FIG. 21, it can be seen that the temperature of the main elements changes linearly according to the order of the plate parts represented on the horizontal sides. This is because the header portion structure of the comparative example does not distribute the cooling fluid uniformly to each plate portion.

That is, in the comparative example, the temperature distribution of the main elements does not form a negative parabolic shape, but forms a linear growth shape. Thus, the error between the desired beam emission angle and the actual beam emission angle of the active antenna 1 can be greatly increased.

22 is a result of numerical analysis using model shapes and analysis conditions according to the embodiments. 1 through 7 rows of FIG. 22 indicate major elements selected from the transceiving elements, respectively. Referring to FIG. 22, it can be seen that the temperature distribution forms a negative parabolic shape. From this, it can be seen that in the header structure of the embodiment of the present invention, the cooling fluid is distributed as uniformly as possible in each plate portion. In this case, the error between the desired beam emission angle and the actual beam emission angle of the active antenna 1 can be minimized.

Fig. 23 is a table showing the numerical analysis results in comparison with the design goals. In FIG. 23, an initial design shows a comparative example and a final design shows an embodiment. Referring to FIG. 23, the comparative example satisfies a condition in which the temperature of the transmission / reception elements 21 is lower than the reference temperature, and a condition in which the temperature deviation of the transmission / reception elements 21 is lower than the reference temperature deviation is satisfied. It can be seen that it does not match the negative parabolic shape. On the other hand, in the embodiment, the temperature of the transmission and reception elements 21 is lower than the reference temperature, the temperature deviation of the transmission and reception elements 21 is lower than the reference temperature deviation, and the temperature distribution of the transmission and reception elements 21 corresponds to the negative parabolic shape. It can be seen that all of the conditions are satisfied.

As described above, according to the embodiment of the present invention, in consideration of the requirements for the normal operation of the active antenna 1, each header portion and the plate portion can be designed, and the suitability of the design result can be confirmed through numerical analysis. . In addition, the liquid cooling method of the heat dissipation device 300 may be provided to circulate the cooling fluid to the single flow path of the cooling plate in the header portion having the improved shape by reflecting the design result confirmed in conformity. In addition, the heat dissipation device 300 may be used to increase the thermal reliability of the active antenna 1 and to perform a stable task.

The above embodiment of the present invention is for the description of the present invention, not for the limitation of the present invention. It is to be noted that the configurations and manners disclosed in the above embodiments of the present invention will be modified in various forms by combining or crossing each other, and such modifications can also be regarded as the scope of the present invention. That is, the present invention will be implemented in various forms that are different from the scope of the claims and equivalent technical idea, and various embodiments are possible within the scope of the technical idea of the present invention for those skilled in the art corresponding to the present invention. You will understand.

10: radiation element
20: transmit / receive module
21: transmitting and receiving element
22: housing
300: heat dissipation device
310: plate portion
320: inlet header
330: outlet header portion
340: cooling fluid circulation
Du: Upstream Segment
Dd: downstream segment

Claims (16)

As a radiator of an active antenna,
A plurality of plate parts arranged in a first direction, extending in a second direction, and thermally contacting the transceiving elements of the active antenna;
An inlet header portion extending in a first direction and communicating with one end of the plate portion;
An outlet header portion extending in a first direction and communicating with the other end portion of the plate portion;
And a cooling fluid circulation part supplying a cooling fluid to the plate part and recovering the cooling fluid from the plate part through the inlet header part and the outlet header part.
Based on the flow of cooling fluid,
The inlet header section has a cross-sectional area of an upstream section smaller than the cross-sectional area of a downstream section, the outlet header section has a cross-sectional area of an upstream section larger than the cross-sectional area of a downstream section,
The transmitting and receiving elements are disposed on both sides of the plate part in a first direction,
The transmitting and receiving elements are heat dissipating devices of the active antenna are arranged in a grid form on each side. Claim 2 has been abandoned upon payment of a set-up fee. As a radiator of an active antenna,
A plurality of plate parts arranged in a first direction, extending in a second direction, and thermally contacting the transceiving elements of the active antenna;
An inlet header portion extending in a first direction and communicating with one end of the plate portion;
An outlet header portion extending in a first direction and communicating with the other end portion of the plate portion;
And a cooling fluid circulation part supplying a cooling fluid to the plate part and recovering the cooling fluid from the plate part through the inlet header part and the outlet header part.
Based on the flow of cooling fluid,
The inlet header section has a cross-sectional area of an upstream section smaller than the cross-sectional area of a downstream section, the outlet header section has a cross-sectional area of an upstream section larger than the cross-sectional area of a downstream section,
The plate portion is formed therein is a single flow path extending and refracted a plurality of times in a second direction and a third direction,
The transmitting and receiving elements are disposed on both sides of the plate part in a first direction,
The transmitting and receiving elements are heat dissipating devices of the active antenna are arranged in a grid form on each side. Claim 3 has been abandoned upon payment of a setup registration fee. As a radiator of an active antenna,
A plurality of plate parts arranged in a first direction, extending in a second direction, and thermally contacting the transceiving elements of the active antenna;
An inlet header portion extending in a first direction and communicating with one end of the plate portion;
An outlet header portion extending in a first direction and communicating with the other end portion of the plate portion;
And a cooling fluid circulation part supplying a cooling fluid to the plate part and recovering the cooling fluid from the plate part through the inlet header part and the outlet header part.
Based on the flow of cooling fluid,
The inlet header section has a cross-sectional area of an upstream section smaller than that of a downstream section, and the outlet header section has a cross-sectional area of an upstream section larger than the cross section of a downstream section,
The component of the cooling fluid includes an antifreeze, the material of the plate portion comprises a metal,
The transmitting and receiving elements are disposed on both sides of the plate part in a first direction,
The transmitting and receiving elements are heat dissipating devices of the active antenna are arranged in a grid form on each side. Claim 4 was abandoned upon payment of a set-up fee. The method according to any one of claims 1 to 3,
Assuming that the cross-sectional areas of the inlet header portion and the outlet header portion are constant in the first direction, assuming that the flow rate value of the cooling fluid flowing therein is the reference plate, the plate portion closest to the median value is
The upstream section and the downstream section of the active antenna of the active antenna is defined based on the reference plate. Claim 5 was abandoned upon payment of a set-up fee. The method according to claim 4,
The reference plate is in communication with the upstream section, the reference plate is a heat radiating device of the active antenna for introducing and discharging the cooling fluid through the upstream section. delete Claim 7 was abandoned upon payment of a set-up fee. The method according to any one of claims 1 to 3,
The grid shape is a two-dimensional grid shape for the second direction and the third direction,
A heat dissipating device of an active antenna, the single channel is formed in the plate portion along the grid. Claim 8 has been abandoned upon payment of a setup registration fee. The method according to any one of claims 1 to 3,
The inlet header portion and the outlet header portion are spaced apart in a second direction,
And the plate portion connects the inlet header portion and the outlet header portion in a second direction between the inlet header portion and the outlet header portion. Claim 9 was abandoned upon payment of a set-up fee. The method according to claim 8,
The heat dissipation device of an active antenna in a first direction, wherein the flow of the cooling fluid of the inlet header portion and the flow of the cooling fluid of the outlet header portion are formed in the same direction. Claim 10 has been abandoned upon payment of a setup registration fee. The method according to any one of claims 1 to 3,
And the plate portion has a length in a second direction greater than a width in a third direction, and a width in the third direction is larger than a thickness in the first direction. Claim 11 was abandoned upon payment of a set-up fee. The method according to claim 10,
Each of the inlet header portion and the outlet header portion has a length in the first direction larger than a diameter in the second and third directions. Claim 12 was abandoned upon payment of a set-up fee. The method according to claim 11,
And the diameters of the inlet header portion and the outlet header portion are smaller than the width of the plate portion and larger than the thickness of the plate portion. Claim 13 has been abandoned upon payment of a setup registration fee. The method according to claim 2,
The single flow path includes at least three extension sections and at least two refracting sections, the number of the extending sections increases to an odd number, the number of the refraction sections increases to an even number, and the flow cross section has a rectangular shape. Radiating device of an active antenna comprising. Claim 14 has been abandoned upon payment of a set-up fee. The method according to claim 3,
The antifreeze is a heat dissipating device of an active antenna comprising ethylene glycol. Claim 15 was abandoned upon payment of a set-up fee. The method according to claim 14,
The metal is a heat dissipation device of an active antenna comprising aluminum. Claim 16 was abandoned upon payment of a set-up fee. A plurality of radiation elements for radiating an RF signal into free space;
A plurality of transmission / reception elements for controlling the magnitude and phase of the RF signal fed to the radiation element;
A plurality of housings in which the transceiving element is accommodated;
And a heat dissipation device according to any one of claims 1 to 3, wherein the heat dissipation device is in thermal contact with the transceiving element through the housing.

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