阅读说明：本技术 毫米波多通道宽带开关阵列及其组装方法 (Millimeter wave multi-channel broadband switch array and assembling method thereof ) 是由 张建新 张殿坤 倪会超 姜祥奔 于 2019-10-31 设计创作，主要内容包括：本发明提供一种毫米波多通道宽带开关阵列及其组装方法,所述组装方法包括：将电路板采用夹具工装烧结到金属壳体上；将放大器、开关MMIC芯片和芯片电容粘接到所述金属壳体上；对所述放大器、所述开关MMIC芯片、所述芯片电容分别与所述电路板进行金丝键合,形成开关阵列组件。本发明提供一种毫米波多通道宽带开关阵列及其组装方法,无需设计芯片载片,减少了装配工序和加工成本。(The invention provides a millimeter wave multichannel broadband switch array and an assembling method thereof, wherein the assembling method comprises the following steps: sintering the circuit board to the metal shell by adopting a fixture tool; bonding an amplifier, a switch MMIC chip and a chip capacitor to the metal shell; and carrying out gold wire bonding on the amplifier, the switch MMIC chip and the chip capacitor and the circuit board respectively to form a switch array component. The invention provides a millimeter wave multichannel broadband switch array and an assembling method thereof, a chip carrier is not required to be designed, and the assembling process and the processing cost are reduced.)

1. An assembly method of a millimeter wave multichannel broadband switch array is characterized by comprising the following steps:

sintering the circuit board to the metal shell by adopting a fixture tool;

bonding an amplifier, a switch MMIC chip and a chip capacitor to the metal shell;

and carrying out gold wire bonding on the amplifier, the switch MMIC chip and the chip capacitor and the circuit board respectively to form a switch array component.

2. The assembly method of claim 1, wherein the sintering the circuit board onto the metal housing using the fixture specifically comprises:

providing the circuit board and the metal shell to be assembled;

cleaning and airing the circuit board and the metal shell;

placing a solder sheet, the circuit board, the filter paper and the metal pressing block into the accommodating cavity of the metal shell in sequence, and fixing the metal shell by using the clamp to form a first assembly component;

placing the first assembly component on a heating platform for sintering, wherein the temperature of the heating platform is 240-250 ℃, the sintering time is 1-1.5min, and taking out the first assembly component after the solder sheet is melted and standing to normal temperature;

and dismantling the clamp, the metal pressing block and the filter paper, cleaning and airing the circuit board and the metal shell after sintering.

3. The method of assembly of claim 2, wherein bonding the amplifier, the switching MMIC chip, and the chip capacitor to the metal housing specifically comprises:

under a microscope, carrying out repairing and balancing on accommodating grooves which are used for installing the amplifier, the switch MMIC chip and the chip capacitor on the circuit board;

uniformly dispensing conductive adhesive, slightly mounting the amplifier, the switch MMIC chip and the chip capacitor in the accommodating groove by using tweezers, and leveling the height;

placing the cavity assembly adhered with the amplifier, the switch MMIC chip and the chip capacitor on a baking oven at 95-105 ℃ for baking for 11-12 h;

the cavity assembly was removed from the oven with tweezers and placed on a heat sink to cool to room temperature.

4. The assembly method according to claim 3, wherein said gold wire bonding said amplifier, said switch MMIC chip, and said chip capacitor to said circuit board respectively comprises:

fixing the cavity assembly on a bonding heating platform and placing the cavity assembly under a microscope lens;

and carrying out gold wire bonding on the amplifier, the switch MMIC chip, the chip capacitor and the circuit board respectively by using an ultrasonic gold wire bonding machine.

5. The assembly method according to claim 4, wherein the gold wire bonding the switch MMIC chip and the circuit board by using an ultrasonic gold wire bonding machine specifically comprises: adjusting the power of ultrasonic waves to 230W, setting the processing time to 70ms, and bonding a 75-micrometer gold band between the switch MMIC chip and the circuit board;

the gold wire bonding is carried out on the chip capacitor and the circuit board by utilizing an ultrasonic gold wire bonding machine, and the method specifically comprises the following steps: wedge welding is adopted between the chip capacitor and the circuit board, the power of ultrasonic waves is adjusted to 200W, and the processing time is set to be 60 ms.

6. The assembly method of claim 3, wherein the mounting the amplifier into the receiving recess and leveling the height specifically comprises:

and fixing the amplifier on a heat dissipation plate, mounting the heat dissipation plate in the accommodating groove, and leveling the heights of the amplifier and the circuit board.

7. The method of assembling of any of claims 1-6, wherein the thickness of the circuit board is 0.127 mm.

8. The method of assembling of any of claims 1-6, further comprising, after forming the switch array assembly:

and debugging, testing, capping and marking the switch array assembly.

9. A millimeter wave multi-channel broadband switch array, comprising: the circuit comprises a metal shell, a circuit board, an amplifier, a switch MMIC chip and a chip capacitor;

the circuit board is sintered on the metal shell, the amplifier, the switch MMIC chip and the chip capacitor are adhered on the metal shell, and the amplifier, the switch MMIC chip and the chip capacitor are respectively connected with the circuit board through bonding gold wires.

10. The millimeter wave multichannel broadband switch array of claim 9, wherein the circuit board is fixed in a receiving cavity on the metal housing, the amplifier, the switch MMIC chip, and the chip capacitor are fixed in a receiving recess on the circuit board, and upper surfaces of the circuit board, the amplifier, the switch MMIC chip, and the chip capacitor are flush with an upper surface of the metal housing.

Technical Field

The invention relates to the technical field of millimeter wave circuits, in particular to a millimeter wave multichannel broadband switch array and an assembling method thereof.

Background

With the continuous development of microwave and millimeter wave technology, millimeter wave broadband products are more and more widely applied in various fields of production and life of people, and have been expanded from single military application in the past to civil fields. The millimeter wave human body security inspection system is mainly used for SAR (synthetic aperture) imaging of a human body at a short distance (less than 1 meter), hundreds of antennas are needed to perform real-time electrical scanning on the human body, a self-generated broadband millimeter wave signal is transmitted to the human body through a transmitting switch array, and human body echo data are transmitted back to a receiver and a background processing computer. In order to improve the resolution of the distance dimension, the operating bandwidth of the millimeter wave switch array is generally about 10 GHz.

At present, the processing technology of the millimeter wave multichannel broadband switch array mainly adopts a micro-assembly process, an amplifier, a switch MMIC (monolithic microwave integrated circuit) chip and a chip capacitor are required to be eutectic or pasted on a molybdenum copper slide to form an assembly, and then the assembly is pasted on a metal shell.

However, in the millimeter wave multi-channel broadband switch array processed by the micro-assembly process, the molybdenum-copper slide is used for matching and balancing the thermal expansion coefficient between the metal shell and the switch MMIC chip, so that the extra processing cost of the molybdenum-copper slide is increased, and the assembly process of eutectic or adhesive slide of the chip is added in the production process, so that the time cost is increased.

Disclosure of Invention

The invention provides a millimeter wave multichannel broadband switch array and an assembling method thereof, a chip carrier is not required to be designed, and the assembling process and the processing cost are reduced.

The invention provides an assembly method of a millimeter wave multichannel broadband switch array on the one hand, which comprises the following steps:

sintering the circuit board to the metal shell by adopting a fixture tool;

bonding an amplifier, a switch MMIC chip and a chip capacitor to the metal shell;

and carrying out gold wire bonding on the amplifier, the switch MMIC chip and the chip capacitor and the circuit board respectively to form a switch array component.

According to the assembling method, the step of sintering the circuit board to the metal shell by adopting the fixture tool specifically comprises the following steps:

providing the circuit board and the metal shell to be assembled;

cleaning and airing the circuit board and the metal shell;

placing a solder sheet, the circuit board, the filter paper and the metal pressing block into the accommodating cavity of the metal shell in sequence, and fixing the metal shell by using the clamp to form a first assembly component;

placing the first assembly component on a heating platform for sintering, wherein the temperature of the heating platform is 240-250 ℃, the sintering time is 1-1.5min, and taking out the first assembly component after the solder sheet is melted and standing to normal temperature;

and dismantling the clamp, the metal pressing block and the filter paper, cleaning and airing the circuit board and the metal shell after sintering.

In the above assembling method, the adhering the amplifier, the switch MMIC chip and the chip capacitor to the metal housing specifically includes:

under a microscope, carrying out repairing and balancing on accommodating grooves which are used for installing the amplifier, the switch MMIC chip and the chip capacitor on the circuit board;

uniformly dispensing the conductive adhesive, slightly mounting the amplifier, the switch MMIC chip and the chip capacitor in the accommodating groove by using tweezers, and leveling the height;

placing the cavity assembly adhered with the amplifier, the switch MMIC chip and the chip capacitor on a baking oven at 95-105 ℃ for baking for 11-12 h;

the cavity assembly was removed from the oven with tweezers and placed on a heat sink to cool to room temperature.

In the above assembling method, the gold wire bonding the amplifier, the switch MMIC chip, and the chip capacitor to the circuit board respectively specifically includes:

fixing the cavity assembly on a bonding heating platform and placing the cavity assembly under a microscope lens;

and carrying out gold wire bonding on the amplifier, the switch MMIC chip, the chip capacitor and the circuit board respectively by using an ultrasonic gold wire bonding machine.

In the above assembling method, the gold wire bonding the switch MMIC chip and the circuit board by using an ultrasonic gold wire bonder specifically includes: adjusting the power of ultrasonic waves to 230W, setting the processing time to 70ms, and bonding a 75-micrometer gold band between the switch MMIC chip and the circuit board;

the gold wire bonding is carried out on the chip capacitor and the circuit board by utilizing an ultrasonic gold wire bonding machine, and the method specifically comprises the following steps: wedge welding is adopted between the chip capacitor and the circuit board, the power of ultrasonic waves is adjusted to 200W, and the processing time is set to be 60 ms.

In the above assembling method, the mounting the amplifier into the receiving recess and leveling the height specifically includes:

and fixing the amplifier on a heat dissipation plate, mounting the heat dissipation plate in the accommodating groove, and leveling the heights of the amplifier and the circuit board.

In the above-described assembling method, the thickness of the circuit board is 0.127 mm.

The assembling method as described above, after the forming of the switch array module, further includes:

and debugging, testing, capping and marking the switch array assembly.

The assembly method of the millimeter wave multichannel broadband switch array provided by the embodiment of the invention is suitable for the field of active millimeter wave human body security check imaging, and works at room temperature, and because the direct chip mounting is adopted in the assembly process and the chip carrier is omitted, the manufacturing and processing cost is reduced, the multi-channel batch producibility is increased, the micro-assembly process steps are simplified, and the matching performance and the transmission quality of millimeter wave broadband signals are improved.

Another aspect of the present invention provides a millimeter wave multichannel broadband switch array, comprising: the circuit comprises a metal shell, a circuit board, an amplifier, a switch MMIC chip and a chip capacitor;

the circuit board is sintered on the metal shell, the amplifier, the switch MMIC chip and the chip capacitor are adhered on the metal shell, and the amplifier, the switch MMIC chip and the chip capacitor are respectively connected with the circuit board through bonding gold wires.

In the switch array described above, the circuit board is fixed in the accommodating cavity on the metal housing, the amplifier, the switch MMIC chip, and the chip capacitor are fixed in the accommodating groove on the circuit board, and upper surfaces of the circuit board, the amplifier, the switch MMIC chip, and the chip capacitor are flush with an upper surface of the metal housing.

The millimeter wave multichannel broadband switch array provided by the embodiment of the invention is suitable for the field of active millimeter wave human body security inspection imaging, works at room temperature, and the chip is directly attached to the metal shell without designing a chip carrier, so that the manufacturing and processing cost is reduced, the multi-channel batch producibility is increased, the micro-assembly process steps are simplified, and the matching performance and the transmission quality of millimeter wave broadband signals are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a flowchart of an assembly method of a millimeter wave multichannel broadband switch array according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structure diagram of a millimeter wave multichannel broadband switch array according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a circuit board sintered to a metal housing;

FIG. 4 is a schematic diagram of a partial structure of a switch MMIC chip and a chip capacitor adhered to a metal housing;

FIG. 5 is a schematic diagram of a partial structure of the MMIC chip and the chip capacitor after gold wire bonding with the circuit board.

Reference numerals:

100-a metal housing;

200-a circuit board;

300-switch MMIC chip;

400-chip capacitance;

500-gold bonding wire.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The antenna array is composed of hundreds to thousands of channels, the distance is only 6-10 mm, the assembly density of the MMIC chip of the internal millimeter wave switch and the amplifier is high, and the antenna array is generally processed and manufactured by adopting a micro-assembly process technology in the prior art. Millimeter wave switches and amplifier MMIC chips are needed for each independent antenna channel, so that the number of the millimeter wave MMIC chips is large, and the millimeter wave MMIC chips are an important component for determining the cost of a system.

At present, the processing technology of the millimeter wave multichannel broadband switch array mainly adopts a micro-assembly process, and is mainly derived from the field of military products. The temperature requirement of the application environment of military products is generally-45 ℃ to +75 ℃, and when active devices, particularly amplifier MMIC chips, are subjected to micro-assembly, molybdenum copper carrier sheets are required to be applied to match the thermal expansion coefficients between the balance structural members and the MMIC chips, so that the GaAs chips are prevented from being cracked due to thermal stress caused by overlarge difference of the thermal expansion coefficients. Therefore, the processing technology of the millimeter wave multi-channel broadband switch array increases extra processing cost of the slide due to the application of the molybdenum-copper slide, and meanwhile, the assembly process of chip eutectic or sticking slide is added in the production process, so that the time cost is increased.

Moreover, a molybdenum-copper slide (a slide with the thickness of 0.1mm is generally adopted) is adopted in the millimeter-wave MMIC chip (the thickness of 0.1mm is generally adopted) of the military product, and the thickness of the component 1 formed by the eutectic or conductive adhesive pasting process is slightly larger than 0.2 mm. In order to meet the requirement of high consistency of two sides of subsequent gold wire bonding, the design of the microstrip circuit board can be carried out only by adopting a Rogers5880 substrate with the thickness of 0.254mm, and the schematic diagram is shown in figure 1. The width of a 50 omega microstrip line of a Rogers5880 substrate with the thickness of 0.254mm is 0.76mm, the difference between the width of the 50 omega microstrip line of the GaAs chip and the width of 0.1mm is large, cascade discontinuity and design mismatching are increased by direct bonding, the loss of millimeter wave broadband signal transmission energy is increased, additional difficulty is added to subsequent design, production, test and debugging, and finally the frequency characteristic of the millimeter wave broadband switch array is poor, the working bandwidth is narrowed, and the consistency among channels is difficult to control.

In order to solve at least one of the problems, the invention provides a millimeter wave multichannel broadband switch array which is mainly applied to a millimeter wave human body security inspection system, has the advantages of large channel number, complex processing technology and high product added value, and is a key core component of the system.

The invention is described below in connection with specific embodiments with reference to the following drawings.

Example one

Fig. 1 is a flowchart of an assembly method of a millimeter wave multichannel broadband switch array according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional structure diagram of the millimeter wave multichannel broadband switch array according to the embodiment of the present invention, and referring to fig. 1 and fig. 2, the embodiment of the present invention provides an assembly method of a millimeter wave multichannel broadband switch array, including the following steps.

And S101, sintering the circuit board 200 to the metal shell 100 by adopting a fixture tool.

Wherein, adopt the fixture attachment sintering to metal casing 100 with circuit board 200, specifically include the following steps:

first, the circuit board 200 and the metal case 100 to be assembled are provided. The circuit board 200 may be a 0.127mm circuit board, such as Rogers5880, which is cut to fit the dimensions of the metal shell 100 and the technical edges removed to facilitate assembly. The metal housing 100 is a unitary structure and has a receiving cavity for receiving the circuit board 200. The specific size and structure of the metal housing 100, the specific size and circuit trace of the circuit board 200 are manufactured according to the requirement of the switch array product required to be obtained.

Next, the circuit board 200 and the metal case 100 are cleaned and dried. The circuit board 200 and the metal case 100 may be cleaned by immersing them in alcohol and using an ultrasonic cleaner. After the cleaning, the circuit board 200 and the metal shell 100 need to be taken out, wiped, placed on filter paper, and dried for about 5 min.

Then, the solder sheet, the circuit board 200, the filter paper, and the metal press block are sequentially placed in the accommodating cavity of the metal housing 100, and the metal housing 100 is fixed using a jig, thereby forming a first assembly component. Wherein a solder sheet is placed under the circuit board 200 to melt at a high temperature and sinter the circuit board 200 on the metal case 100. The jig is fixed to the outside of the metal shell 100 to secure the connection stability of the first assembling member.

And then, placing the first assembly on a heating platform for sintering, wherein the temperature of the heating platform is 240-250 ℃, the sintering time is 1-1.5min, taking out the first assembly after the material sheet to be welded is melted, and standing to normal temperature. After the solder pieces are melted, the circuit board 200 is sintered and connected in the receiving cavity of the metal housing 100. At this time, the first assembly component should be taken out in time to prevent the other structures of the circuit board 200 from being damaged due to the excessively long heating time.

And finally, removing the clamp, the metal pressing block and the filter paper, and cleaning and airing the sintered circuit board 200 and the sintered metal shell 100. And (3) sequentially removing the clamp, the metal pressing block and the filter paper, putting the sintered circuit board 200 and the sintered metal shell 100 into an ultrasonic cleaning machine for cleaning, and then airing.

Fig. 3 is a schematic structural diagram of a circuit board sintered onto a metal housing, and referring to fig. 3, after S101 is completed, a circuit board 200 is sintered onto a metal housing 100, and fig. 3 illustrates a switch array with four channels as an example.

And S102, adhering the amplifier, the switch MMIC chip 300 and the chip capacitor 400 to the metal shell 100.

Wherein, the adhering the amplifier, the switch MMIC chip 300 and the chip capacitor 400 to the metal housing 100 specifically comprises:

first, a conductive paste is provided. The conductive adhesive can be H20E, and before use, the conductive adhesive needs to be taken out from a freezing storage device and thawed, then the conductive adhesive is proportioned according to the proportioning requirement, and is fully stirred for about 10 minutes to ensure the conductivity of the conductive adhesive.

And then, the accommodating grooves of the circuit board 200 for mounting the amplifier, the switch MMIC chip 300 and the chip capacitor 400 are repaired and leveled under a microscope, so that the accommodating grooves have enough assembling space for accommodating the amplifier, the switch MMIC chip 300 and the chip capacitor 400, and the surface levelness of the amplifier, the switch MMIC chip 300 and the chip capacitor 400 and the circuit board 200 is ensured. The accommodating groove is a groove formed in the circuit board 200 and penetrating through the upper and lower surfaces of the circuit board 200, and the area of the accommodating groove is slightly larger than that of the amplifier, switch MMIC chip 300 or chip capacitor 400 to be assembled.

Then, the conductive adhesive is uniformly dispensed, and the amplifier, the switch MMIC chip 300 and the chip capacitor 400 are lightly mounted in the accommodating groove by using tweezers and the height is leveled. The chip capacitor 400 includes a filter capacitor, a blocking capacitor, and the like, and different types of chips have different sizes and functions, and their mounting positions should be designed according to their functions. After mounting, the height should also be leveled to ensure that the amplifier, switch MMIC chip 300 and chip capacitors 400 are flush with the surface of the board 200. The amplifier, the switch MMIC chip 300 and the chip capacitor 400 are lightly mounted in the accommodating groove by using tweezers, and the accommodating groove is a slot penetrating through the upper and lower surfaces of the circuit board 200, so that the amplifier, the switch MMIC chip 300 or the chip capacitor 400 is mounted in the accommodating groove, and meanwhile, the bottom of the amplifier, the switch MMIC chip 300 or the chip capacitor 400 is mounted on the upper surface of the metal shell 100.

And then, placing the cavity assembly adhered with the amplifier, the switch MMIC chip 300 and the chip capacitor 400 on an oven at 95-105 ℃ for baking for 11-12 h. The conductive adhesive can be solidified through drying, so that the bonding reliability of the conductive adhesive is ensured.

Finally, the cavity assembly was removed from the oven with tweezers and placed on a heat sink to cool to room temperature. And after the conductive adhesive is dried, taking out the conductive adhesive from the oven, and cooling to room temperature.

Fig. 4 is a schematic diagram of a partial structure of the switch MMIC chip 300 and the chip capacitor 400 adhered to the metal housing 100, and referring to fig. 4, the switch MMIC chip 300 and the chip capacitor 400 are disposed near the channel traces of the circuit board 200 according to their functions.

It should be noted that in a consumer product, the power requirement for the amplifier is low because the power required by the switch array is small, and the mounting and bonding manner of the amplifier is the same as that of the switch MMIC chip 300 and the chip capacitor 400. However, when the required amplifier power is high, the amplifier may be fixed on the heat sink plate, and the heat sink plate may be mounted in the receiving recess and the heights of the amplifier and the circuit board 200 may be leveled for heat dissipation.

S103, carrying out gold wire bonding on the amplifier, the switch MMIC chip 300 and the chip capacitor 400 and the circuit board 200 respectively to form a switch array component.

The gold wire bonding is respectively carried out on the amplifier, the switch MMIC chip 300 and the chip capacitor 400 and the circuit board 200, and the method specifically comprises the following steps:

firstly, fixing the cavity assembly on a bonding heating platform and placing the cavity assembly under a microscope lens. The bonding heating platform needs to be provided with a ball welding ceramic nozzle before use, and after the cavity assembly is fixed on the bonding heating platform, the bonding heating platform needs to be placed under a microscope lens so as to facilitate subsequent gold wire bonding operation.

Then, the amplifier, the switch MMIC chip 300, the chip capacitor 400 and the circuit board 200 are respectively gold-bonded by an ultrasonic gold-wire bonding machine.

The gold wire bonding is performed on the switch MMIC chip 300 and the circuit board 200 by using an ultrasonic gold wire bonding machine, and specifically includes: the power of the ultrasonic wave was adjusted to 230W, the processing time was set to 70ms, and 75 μm gold tape bonding was used between the switch MMIC chip 300 and the circuit board 200.

The method for carrying out gold wire bonding on the chip capacitor 400 and the circuit board 200 by utilizing the ultrasonic gold wire bonding machine specifically comprises the following steps: wedge-type welding is adopted between the chip capacitor 400 and the circuit board 200, the power of the ultrasonic wave is adjusted to 200W, and the processing time is set to be 60 ms.

Fig. 5 is a schematic view of a partial structure of the switch MMIC chip 300 and the chip capacitor 400 after gold wire bonding with the circuit board 200, and referring to fig. 5, after the gold wire bonding operation is completed, the switch MMIC chip 300 and the chip capacitor 400 are respectively connected with the circuit board 200 through a gold bonding wire 500.

On the basis of the above embodiment, after the above steps are completed, the formed switch array assembly needs to be debugged, tested, capped and marked. Specifically, firstly, an external millimeter wave connector and a test high-frequency cable need to be assembled, a peripheral circuit and an instrument and meter are connected, the switch array assembly is debugged and tested, and after the debugging and testing are completed, the cover is closed and the mark is marked.

In the prior art, because a molybdenum-copper slide is adopted, the consistency requirement of the heights of two sides of the subsequent gold wire bonding is facilitated, and therefore, a circuit board with the thickness of 0.254mm is adopted for design. The direct bonding of the circuit board and the chip with the thickness can increase the discontinuity of cascade connection and the mismatching of design, the loss of the transmission energy of the millimeter wave broadband signal becomes large, additional difficulty is added to subsequent design, production, test and debugging, and finally the frequency characteristic of the millimeter wave broadband switch array becomes poor, the working bandwidth becomes narrow and the consistency among channels is difficult to control.

In the present embodiment, the thickness of the circuit board 200 is 0.127 mm. The difference between the width of the strip line of the circuit board 200 and the width of the microstrip line of the chip is small, the bonding can be directly carried out, the cascade connection is continuous, the design matching is carried out, the loss of the transmission energy of the millimeter wave broadband signal is small, and therefore the improvement of the frequency characteristics of the millimeter wave broadband switch array and the consistency among channels is facilitated. And, compared with the scheme of arranging the chip carrier in the prior art, the circuit board 200 may be arranged to have a lower thickness so as to be consistent with the height of the chip because the chip carrier does not need to be arranged.

The assembly method of the millimeter wave multichannel broadband switch array provided by the embodiment of the invention is suitable for the field of active millimeter wave human body security check imaging, and works at room temperature, and because the direct chip mounting is adopted in the assembly process and the chip carrier is omitted, the manufacturing and processing cost is reduced, the multi-channel batch producibility is increased, the micro-assembly process steps are simplified, and the matching performance and the transmission quality of millimeter wave broadband signals are improved.

Example two

Another aspect of the present invention provides a millimeter wave multichannel broadband switch array, comprising: metal housing 100, circuit board 200, amplifier, switch MMIC chip 300 and chip capacitor 400;

the circuit board 200 is sintered on the metal housing 100, the amplifier, the switch MMIC chip 300 and the chip capacitor 400 are adhered on the metal housing 100, and the amplifier, the switch MMIC chip 300 and the chip capacitor 400 are respectively connected with the circuit board 200 through bonding gold wires 500.

The circuit board 200 is fixed in the accommodating cavity on the metal housing 100, the amplifier, the switch MMIC chip 300 and the chip capacitor 400 are fixed in the accommodating groove on the metal housing 100, the depths of the accommodating cavity and the accommodating groove are different, and the upper surfaces of the circuit board 200, the amplifier, the switch MMIC chip 300 and the chip capacitor 400 are flush with the upper surface of the metal housing 100.

The millimeter wave multichannel broadband switch array provided by the embodiment of the invention is suitable for the field of active millimeter wave human body security inspection imaging, works at room temperature, and the chip is directly attached to the metal shell without designing a chip carrier, so that the manufacturing and processing cost is reduced, the multi-channel batch producibility is increased, the micro-assembly process steps are simplified, and the matching performance and the transmission quality of millimeter wave broadband signals are improved.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, are used to indicate an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the position or element referred to must have a particular orientation, be of particular construction and operation, and thus, are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.