Circuit board assembly and directional coupler

Abstract

The utility model relates to the technical field of communication, and provides a circuit board assembly and a directional coupler. The packaging device is fixed on the circuit board, the packaging device comprises a packaging body, a coupling belt, an isolation fixed resistor, a first leading-out belt and a second leading-out belt, the coupling belt, the isolation fixed resistor, the first leading-out belt and the second leading-out belt are packaged in the packaging body, the isolation fixed resistor is connected between the first end of the coupling belt and the first leading-out belt, and the first leading-out belt is connected with a grounding point of the circuit board. The second end of the coupling band is provided with a second leading-out band. And the coupling output band is arranged on the circuit board, and the coupling output band is connected with the second leading-out band so as to output a coupling signal. When the circuit board assembly is produced, the directivity index is debugged in the sealing and testing process of the packaging device, and then the packaging device only needs to be fixed on the circuit board, so that the influence of the processing precision of the circuit board and the dispensing process on the directivity index is avoided.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a circuit board assembly and a directional coupler. Background Art

[0002] A directional coupler is a directional power coupling element that can be used to isolate, separate, and mix signals. Directivity refers to the ratio of the output power at the directional coupling port to the output power at the isolation port.

[0003] An existing directional coupler is Figure 1 and Figure 2 As shown, the directional coupler 200 includes a main signal rod 201 and a circuit board 202, wherein the main signal rod 201 and the circuit board 202 are spaced apart. A coupling strip 203 is provided on the side of the circuit board 202 facing the main signal rod 201, and the coupling strip 203 is arranged parallel to the main signal rod 201. An isolation output strip 204 and a coupling output strip 205 are provided on the side of the circuit board 202 facing away from the main signal rod 201. The isolation output strip 204 and the coupling output strip 205 are respectively connected to the two ends of the coupling strip 203 through metallized holes 206, and an isolation potentiometer 207 and a coupling potentiometer 208 are respectively provided on the isolation output strip 204 and the coupling output strip 205.

[0004] Because the circuit board manufacturing process involves acid cleaning, copper removal, copper addition, and etching, the dimensions of the coupling strip (such as strip thickness and width) cannot be precisely controlled, which has a certain impact on the directivity index. Therefore, it is necessary to adjust the resistance value of the isolation potentiometer to achieve the best directionality of the directional coupler.

[0005] However, the isolation potentiometer is generally fixed by dispensing glue after adjustment. Since the glue is fluid before solidification, the glue may exert force on the rotor of the isolation potentiometer during the solidification process, causing the impedance of the isolation potentiometer to change, resulting in a change in the directional index of the directional coupler. Utility Model Content

[0006] In view of this, embodiments of the present application provide a circuit board assembly and a directional coupler to solve the problem that the glue fixation of the isolation potentiometer may cause the directionality index of the directional coupler to change.

[0007] A first aspect of the present application provides a circuit board assembly, comprising:

[0008] circuit boards;

[0009] a packaged device fixed on the circuit board, the packaged device comprising a package body and a coupling strap, an isolation fixed resistor, a first lead strap, and a second lead strap encapsulated within the package body, the isolation fixed resistor being connected between a first end of the coupling strap and the first lead strap, the first lead strap being connected to a ground point of the circuit board, and the second end of the coupling strap being connected to the second lead strap;

[0010] A coupling output strip is provided on the circuit board, and the coupling output strip is connected to the second lead-out strip to output a coupling signal.

[0011] The circuit board assembly provided by the embodiments of the present application has the following beneficial effects: In the packaged device, the coupling strap can be processed using semiconductor technology, so that the dimensional accuracy of the coupling strap (e.g., bandwidth, thickness, and spacing) can reach the micron level, which has little or no effect on the directional index. This eliminates the need for an isolation potentiometer to adjust the resistance value, and allows the use of a relatively high-precision isolation fixed resistor instead. Therefore, during product production, the directional index is debugged during the packaging and testing of the packaged device to select an isolation fixed resistor with an appropriate resistance value to ensure the best directional index. Afterwards, the packaged device only needs to be fixed to the circuit board, avoiding the impact of the circuit board processing accuracy and the dispensing process on the directional index.

[0012] In some embodiments, the circuit board has a metallized hole, the packaging device and the coupling output strip are respectively arranged on opposite sides of the circuit board in the thickness direction, and the coupling output strip is connected to the second lead-out strip through the metallized hole.

[0013] In some embodiments, the metallized hole is copper.

[0014] In some embodiments, the packaged device further includes a plurality of connecting pins provided on the package body, and the packaged device is fixed on the circuit board via the plurality of connecting pins.

[0015] In some embodiments, the plurality of connecting pins include a first connecting pin and a second connecting pin, the first lead-out strip is connected to the grounding point of the circuit board through the first connecting pin, and the coupling output strip is connected to the second lead-out strip through the metallized hole and the second connecting pin.

[0016] In some embodiments, the coupling strip is a copper strip, and / or the out-coupling strip is a copper strip.

[0017] In some embodiments, the isolation fixed resistor is a thin film resistor or a thick film resistor.

[0018] In some embodiments, the coupling strip is a straight line structure.

[0019] A second aspect of the present application provides a directional coupler, which includes a main signal rod and the circuit board assembly according to the first aspect, wherein the main signal rod and the coupling strip are spaced apart to achieve coupling.

[0020] The directional coupler adopts any one or more embodiments of the above-mentioned circuit board assembly, and thus has the beneficial effects of the above-mentioned embodiments, which will not be described in detail here.

[0021] In some embodiments, the directional coupler further includes a connecting seat, the main signal rod is located in the connecting seat, the circuit board is fixed on the connecting seat, and the connecting seat is provided with a receiving groove for receiving the packaged device.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or conventional technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 It is a structural diagram of a directional coupler in the prior art;

[0025] Figure 2 yes Figure 1 A schematic structural diagram of the directional coupler from another perspective;

[0026] Figure 3 is a schematic structural diagram of a directional coupler provided by some embodiments of the present application from a first perspective;

[0027] Figure 4 is a schematic structural diagram of a directional coupler provided by some embodiments of the present application from a second perspective;

[0028] Figure 5 yes Figure 4 Schematic diagram of the structure after removing the connecting seat;

[0029] Figure 6 yes Figure 5 Schematic diagram of the structure of the packaged device;

[0030] Figure 7 yes Figure 5 A schematic diagram of the structure after removing the package body of the packaged device;

[0031] Figure 8 yes Figure 7 Enlarged view of point A in the middle;

[0032] Figure 9 is a schematic structural diagram of a directional coupler provided by some embodiments of the present application from a third perspective;

[0033] Figure 10 yes Figure 9 Cross-sectional view along the BB direction;

[0034] Figure 11 yes Figure 10 Enlarged view of point C in the middle.

[0035] The meanings of the marks in the figure are:

[0036] 100, directional coupler;

[0037] 10. Circuit board assembly;

[0038] 11. Circuit board; 111. Metallized hole; 112. Grounding point;

[0039] 12. Package device; 121. Package body; 122. Coupling strap; 1221. First end; 1222. Second end; 123. Isolation fixed resistor; 124. First lead strap; 125. Second lead strap; 126. Connecting pin; 1261. First connecting pin; 1262. Second connecting pin;

[0040] 13. Coupling output band;

[0041] 14. Coupling potentiometer;

[0042] 20. Main signal pole;

[0043] 30. Connecting seat; 31. Boss; 311. Accommodating groove; 32. Connecting sleeve;

[0044] 200, directional coupler; 201, main signal rod; 202, circuit board; 203, coupling strip; 204, isolation output strip; 205, coupling output strip; 206, metallized hole; 207, isolation potentiometer; 208, coupling potentiometer. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0048] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0050] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0051] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0053] The embodiment of the first aspect of the present application provides a circuit board assembly for a directional coupler. Figure 3 、 Figure 5 、 Figure 6 and Figure 8 The circuit board assembly 10 includes a circuit board 11, a packaged device 12, and a coupling output strip 13. The packaged device 12 is fixed to the circuit board 11 and includes a package body 121, a coupling strip 122 encapsulated within the package body 121, an isolation fixed resistor 123, a first lead strip 124, and a second lead strip 125. The isolation fixed resistor 123 is connected between a first end 1221 of the coupling strip 122 and the first lead strip 124. The first lead strip 124 is connected to a ground point 112 of the circuit board 11, and a second end 1222 of the coupling strip 122 is connected to the second lead strip 125. The coupling output strip 13 is provided on the circuit board 11 and is connected to the second lead strip 125 to output a coupled signal.

[0054] The circuit board 11 is spaced apart from the main signal rod 20 of the directional coupler 100. Optionally, the circuit board 11 is a rigid circuit board.

[0055] The packaged device 12 is manufactured using packaging technology. It is fixed to the side of the circuit board 11 facing the main signal rod 20. For example, the packaged device 12 can be fixed to the circuit board 11 by welding, bonding, clamping, fastener connection, etc. The packaged device 12 is spaced apart from the main signal rod 20.

[0056] The package body 121 is made of an insulating material, for example, the insulating material may be plastic or ceramic. When the insulating material is plastic, the plastic may be epoxy resin, polypropylene, polyethylene, etc.

[0057] It can be understood that the coupling belt 122 can be a straight line structure as a whole; or, the coupling belt 122 can be a broken line structure as a whole; or, the coupling belt 122 can be partially straight line and partially broken line.

[0058] When the coupling strap 122 is an overall linear structure, the length direction of the coupling strap 122 is consistent with the length direction X of the main signal rod 20. It can be understood that the coupling strap 122 is parallel or approximately parallel to the main signal rod 20, and the coupling strap 122 is spaced apart from the main signal rod 20 to couple the signal transmitted on the main signal rod 20 to the coupling strap 122. The coupling strap 122 can be manufactured using semiconductor technology, so that the dimensional accuracy of the coupling strap 122 (e.g., strap width, strap thickness, strap spacing, etc.) can reach the micron level.

[0059] The isolation fixed resistor 123 is a fixed resistor located at the isolation terminal, replacing the isolation potentiometer used in prior art. The isolation fixed resistor 123 is connected between the first end 1221 of the coupling strap 122 and the first lead strap 124. It should be understood that the coupling strap 122 and the first lead strap 124 are not directly connected; the first lead strap 124 is connected to the ground point 112 of the circuit board 11 to achieve grounding of the isolation terminal. A high-precision resistor can be used for the isolation fixed resistor 123 to ensure directional matching. For example, the resistance accuracy can be around 0.1%.

[0060] It can be understood that the isolation fixed resistor 123 can be located on the side of the coupling strip 122 facing the circuit board 11 , or on the side of the coupling strip 122 facing away from the circuit board 11 .

[0061] The second end 1222 of the coupling strip 122 is connected to the second lead strip 125 . Therefore, the coupling signal on the coupling strip 122 can be transferred to the coupling output strip 13 through the second lead strip 125 to achieve output of the coupled signal.

[0062] The first end 1221 and the second end 1222 of the coupling strip 122 are spaced apart in the length direction X of the main signal rod 20 .

[0063] The coupling output strip 13 is provided on the circuit board 11. It is understood that the coupling output strip 13 can be located on the side of the circuit board 11 facing away from the main signal rod 20, that is, the coupling output strip 13 and the packaged device 12 are located on opposite sides of the circuit board 11 in the thickness direction. Alternatively, the coupling output strip 13 can be located on the side of the circuit board 11 facing the main signal rod 20, that is, the coupling output strip 13 and the packaged device 12 are located on the same side of the circuit board 11 in the thickness direction. A coupling potentiometer 14 is provided on the coupling output strip 13.

[0064] The beneficial effects of the circuit board assembly 10 provided by the embodiment of the present application are as follows: In the packaged device 12, the coupling band 122 can be processed using semiconductor technology, so that the dimensional accuracy of the coupling band 122 (such as bandwidth, band thickness, band spacing, etc.) can reach the micron level, for example, ±2um, which has little or no effect on the directional index. In this way, there is no need for an isolation potentiometer to adjust the resistance value, that is, a relatively high-precision isolation fixed resistor 123 can be used instead of the isolation potentiometer. Therefore, during product production, the directional index is debugged during the packaging and testing process of the packaged device 12 to select the isolation fixed resistor 123 with a suitable resistance value to ensure the best directional index; then, the packaged device 12 only needs to be fixed to the circuit board 11, avoiding the influence of the processing accuracy of the circuit board 11 and the dispensing process on the directional index.

[0065] Among them, semiconductor technology includes but is not limited to sputtering, vacuum plating and other high-precision processes.

[0066] Please also refer to Figure 3 、 Figure 7 and Figure 8 In some embodiments, the circuit board 11 has a metallized hole 111, and the packaging device 12 and the coupling output strip 13 are respectively arranged on the opposite side surfaces in the thickness direction of the circuit board 11, and the coupling output strip 13 is connected to the second lead-out strip 125 through the metallized hole 111.

[0067] The metallized hole 111 is a hole between the top layer and the bottom layer of the circuit board 11 , on which a layer of conductive metal is plated by chemical plating or electroplating, so that the top layer and the bottom layer of the circuit board 11 are connected to each other.

[0068] Optionally, the metallized hole 111 is copper, that is, the conductive metal plated on the inner wall of the hole is copper. Of course, other conductive metals can also be plated on the inner wall of the hole.

[0069] The packaging device 12 and the coupling output strip 13 are respectively arranged on the opposite side surfaces of the circuit board 11 in the thickness direction, that is, the packaging device 12 is arranged on the side surface of the circuit board 11 facing the main signal rod 20, and the coupling output strip 13 is arranged on the side surface of the circuit board 11 facing away from the main signal rod 20.

[0070] The coupling-out strip 13 is connected to the second lead-out strip 125 through the metallized hole 111 , that is, the coupling-out strip 13 is connected to one end of the metallized hole 111 , and the second lead-out strip 125 is connected to the other end of the metallized hole 111 .

[0071] Since the packaging device 12 and the coupling output strip 13 are respectively arranged on the opposite side surfaces in the thickness direction of the circuit board 11, the coupling output strip 13 is far away from the main signal rod 20 and is not easily affected by the signal transmitted on the main signal rod 20, thereby ensuring the accuracy of the coupling signal output by the coupling output strip 13.

[0072] In other embodiments, the coupling output strip 13 and the packaging device 12 can be placed on the same side of the circuit board 11 in its thickness direction. In this case, the distance between the coupling strip 122 in the packaging device 12 and the main signal rod 20 is smaller than the distance between the coupling output strip 13 and the main signal rod 20, so as to avoid the coupling output strip 13 being affected by the signal transmitted on the main signal rod 20.

[0073] Please also refer to Figure 5 and Figure 6 In some embodiments, the packaged device 12 further includes a plurality of connecting pins 126 disposed on the package body 121 , and the packaged device 12 is fixed on the circuit board 11 via the plurality of connecting pins 126 .

[0074] It can be understood that the multiple connecting pins 126 can form two rows, and the two rows of connecting pins 126 are respectively arranged on opposite sides of the package body 121 in the width direction Y of the package body 121, wherein the width direction Y can be perpendicular to the extension direction of the coupling band 122, or can be consistent with the extension direction of the coupling band 122; alternatively, the multiple connecting pins 126 can also form three rows, and the three rows of connecting pins 126 are respectively located on three sides of the package body 121; alternatively, the multiple connecting pins 126 can also form four rows, and the four rows of connecting pins 126 are respectively located on four sides of the package body 121.

[0075] When the plurality of connecting pins 126 form two rows, the two rows of connecting pins 126 are respectively arranged on opposite sides of the package body 121 in the width direction Y of the package body 121, and the plurality of connecting pins 126 in each row are spaced apart in the length direction X of the main signal rod 20. The width direction Y of the package body 121 is perpendicular to the length direction X of the main signal rod 20.

[0076] One end of the connecting pin 126 is located inside the package 121 , and the other end of the connecting pin 126 is located outside the package 121 .

[0077] It can be understood that a solder pad is provided on the circuit board 11, and the end of the connecting pin 126 outside the package body 121 can be soldered to the solder pad of the circuit board 11; or, a socket is provided on the circuit board 11, and the end of the connecting pin 126 outside the package body 121 can be inserted into the socket of the circuit board 11.

[0078] The packaged device 12 is fixed on the circuit board 11 via a plurality of connecting pins 126 , so that the packaged device 12 has higher stability and longer service life after connection.

[0079] In other embodiments, the connecting pin 126 may not be provided on the package body 121, but the package body 121 may be adhesively fixed to the circuit board 11. In this case, a first connector and a second connector need to be provided on the package body 121, and the first lead-out strip 124 is connected to the grounding point 112 of the circuit board 11 through the first connector, and the second lead-out strip 125 is connected to the coupling output strip 13 through the metallized hole 111 and the second connector to realize the output of the coupled signal.

[0080] Please also refer to Figure 3 、 Figure 6 、 Figure 7 as well as Figure 8 In some embodiments, the plurality of connecting pins 126 include a first connecting pin 1261 and a second connecting pin 1262, the first lead-out strip 124 is connected to the grounding point 112 of the circuit board 11 through the first connecting pin 1261, and the coupling output strip 13 is connected to the second lead-out strip 125 through the metallized hole 111 and the second connecting pin 1262.

[0081] It can be understood that the first connecting pin 1261 and the second connecting pin 1262 can be on the same side of the package body 121; or, the first connecting pin 1261 and the second connecting pin 1262 can be respectively on opposite sides of the package body 121; or, the first connecting pin 1261 and the second connecting pin 1262 can respectively be on adjacent sides of the package body 121.

[0082] Optionally, the first connecting pin 1261 and the second connecting pin 1262 are respectively located at two ends of the package body 121 in the length direction X of the main signal rod 20 .

[0083] Optionally, the first lead-out belt 124 and the second lead-out belt 125 both extend along the width direction Y of the coupling belt 122, that is, the first lead-out belt 124 and the second lead-out belt 125 are both perpendicular to the coupling belt 122; the coupling output belt 13 is parallel to the second lead-out belt 125, that is, the coupling output belt 13 is perpendicular to the coupling belt 122.

[0084] The first lead-out strip 124 is connected to the grounding point 112 of the circuit board 11 through the first connecting pin 1261, that is, the first lead-out strip 124 is connected to the end of the first connecting pin 1261 inside the package body 121, and the end of the first connecting pin 1261 outside the package body 121 is connected to the grounding point 112 of the circuit board 11.

[0085] The coupling output strip 13 is connected to the second lead-out strip 125 through the metallized hole 111 and the second connecting pin 1262, that is, the coupling output strip 13 is connected to one end of the metallized hole 111, the end of the second connecting pin 1262 outside the package body 121 is connected to the other end of the metallized hole 111, and the end of the second connecting pin 1262 inside the package body 121 is connected to the second lead-out strip 125.

[0086] By adopting the above technical solution, the first connecting pin 1261 and the second connecting pin 1262 not only play the role of fixing the packaged device 12, but also can respectively realize the grounding of the isolation end and the transmission of the coupling signal from the coupling band 122 to the coupling output band 13, thereby simplifying the structure of the packaged device 12.

[0087] In other embodiments, the first connecting pin 1261 and the second connecting pin 1262 only serve to fix the packaged device 12, and a first connector and a second connector need to be additionally provided on the package body 121. The first lead-out strip 124 is connected to the grounding point 112 of the circuit board 11 through the first connector, and the second lead-out strip 125 is connected to the coupling output strip 13 through the metallized hole 111 and the second connector to realize the output of the coupling signal.

[0088] In some embodiments, the coupling strip 122 is a copper strip, and the coupling-out strip 13 is a copper strip.

[0089] Optionally, the coupling output strip 13 is a microstrip line provided on the circuit board 11 .

[0090] By adopting the above technical solution, the copper tape has good electrical conductivity, which is beneficial to the coupling and output of the signal, thereby ensuring the accuracy of the output signal.

[0091] In other embodiments, the coupling strip 122 is a copper strip, and the coupling output strip 13 can be other metal strips with good conductivity; or, the coupling output strip 13 is a copper strip, and the coupling strip 122 can be other metal strips with good conductivity; or, both the coupling strip 122 and the coupling output strip 13 can be other metal strips with good conductivity.

[0092] In some embodiments, the first lead-out tape 124 and / or the second lead-out tape 125 may be a copper tape, or may be other metal tapes with good electrical conductivity.

[0093] It can be understood that the first lead-out belt 124 and the second lead-out belt 125 can be integrally formed with the coupling belt 122. In this case, the first lead-out belt 124 and the second lead-out belt 125 are made of the same material as the coupling belt 122; or, the first lead-out belt 124 and the second lead-out belt 125 can be fixed on the coupling belt 122 (by means of but not limited to welding, fastener connection, crimping, clamping, etc.). In this case, the first lead-out belt 124 and the second lead-out belt 125 can be made of the same material as or different from the coupling belt 122.

[0094] In some embodiments, the isolation fixed resistor 123 is a thin film resistor or a thick film resistor.

[0095] Thin-film resistors are manufactured using thin-film processes. Specifically, they deposit metal or alloy thin films on insulating substrates using processes such as vacuum evaporation and magnetron sputtering. Film thickness is generally less than 10 μm, and most are less than 1 μm. Commonly used thin-film materials include platinum and nickel-chromium alloys. Thin-film resistors typically have a smooth and uniform thickness and relatively high resistance accuracy.

[0096] Thick-film resistors are manufactured using a thin-film process. Specifically, a thick layer of resistor material, typically greater than 10µm thick, is applied to an insulating substrate using a screen-printing process. Common resistor materials include metals and carbon. Thick-film resistors offer a simple manufacturing process, low cost, and high power handling capabilities.

[0097] In other embodiments, the isolated fixed resistor 123 may also be a high-precision resistor manufactured by other processes.

[0098] Please also refer to Figures 3 to 6 The second aspect of this application provides a directional coupler 100. The directional coupler 100 includes a main signal rod 20 and the circuit board assembly 10 described in the first aspect. The main signal rod 20 and the coupling strip 122 are spaced apart to achieve coupling. The directional coupler 100 is used in a base station RRU (Remote Radio Unit) in a communication system to monitor downlink operating status and calibrate multiple antennas.

[0099] One end of the main signal rod 20 is the input end, the other end of the main signal rod 20 is the direct output end, the first end 1221 of the coupling strip 122 is the isolation end, and the second end 1222 of the coupling strip 122 is the coupling end. That is, the main signal rod 20 is used to transmit the main signal, and the coupling strip 122 is used to transmit the coupled signal. Optionally, the main signal rod 20 is a cylindrical rod.

[0100] The directional coupler 100 adopts any one or more embodiments of the above-mentioned circuit board assembly 10 , and thus has the beneficial effects of the above-mentioned embodiments, which will not be described in detail here.

[0101] Please also refer to Figures 9 to 11 The directional coupler 100 further includes a connecting base 30 , in which the main signal rod 20 is located. The circuit board 11 is fixed on the connecting base 30 . The connecting base 30 is provided with an accommodating groove 311 for accommodating the packaged device 12 .

[0102] Optionally, the connecting base 30 includes a connecting sleeve 32 and a boss 31 provided on the outer wall of the connecting sleeve 32. The main signal rod 20 is located in the connecting sleeve 32, the receiving groove 311 is provided on the boss 31, and the circuit board 11 is fixed to the boss 31. The boss 31 can be integrally formed with the connecting sleeve 32, or the boss 31 can be fixed to the outer wall of the connecting sleeve 32.

[0103] The connection base 30 is made of an insulating material, for example, the insulating material can be plastic or ceramic. When the insulating material is plastic, the plastic can be epoxy resin, polypropylene, polyethylene, etc.

[0104] Among them, the shape of the accommodating groove 311 is designed according to the shape of the packaging device 12. For example, the shape of the packaging device 12 can be rectangular, and correspondingly, the shape of the accommodating groove 311 is rectangular; the shape of the packaging device 12 can also be circular or elliptical, and correspondingly, the shape of the accommodating groove 311 is circular or elliptical.

[0105] By adopting the above technical solution, when fixing the circuit board 11 , the packaged component 12 is located in the receiving groove 311 of the boss 31 , and the circuit board 11 is supported on the boss 31 to ensure the stability of the fixing of the circuit board 11 .

[0106] In other embodiments, the connecting seat 30 includes a connecting sleeve 32 and a plurality of fixing columns arranged on the outer wall surface of the connecting sleeve 32. The circuit board 11 is fixed on the plurality of fixing columns. The plurality of fixing columns form a receiving space for accommodating the packaged device 12. At the same time, the height of the fixing columns should ensure that the packaged device 12 is in the receiving space and will not interfere with the connecting sleeve 32.

[0107] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A circuit board assembly, characterized in that: include: circuit boards; a packaged device fixed on the circuit board, the packaged device comprising a package body and a coupling strap, an isolation fixed resistor, a first lead strap, and a second lead strap encapsulated within the package body, the isolation fixed resistor being connected between a first end of the coupling strap and the first lead strap, the first lead strap being connected to a ground point of the circuit board, and the second end of the coupling strap being connected to the second lead strap; A coupling output strip is provided on the circuit board, and the coupling output strip is connected to the second lead-out strip to output a coupling signal.

2. The circuit board assembly according to claim 1, wherein: The circuit board has a metallized hole, the packaging device and the coupling output strip are respectively arranged on opposite sides of the circuit board in a thickness direction, and the coupling output strip is connected to the second lead-out strip through the metallized hole.

3. The circuit board assembly according to claim 2, wherein: The metallized holes are copper holes.

4. The circuit board assembly according to claim 2, wherein: The packaged device further includes a plurality of connecting pins provided on the package body, and the packaged device is fixed on the circuit board via the plurality of connecting pins.

5. The circuit board assembly according to claim 4, wherein: The plurality of connecting pins include a first connecting pin and a second connecting pin. The first lead strip is connected to the grounding point of the circuit board through the first connecting pin. The coupling output strip is connected to the second lead strip through the metallized hole and the second connecting pin.

6. The circuit board assembly according to any one of claims 1 to 5, wherein: The coupling strip is a copper strip, and / or the coupling-out strip is a copper strip.

7. The circuit board assembly according to any one of claims 1 to 5, wherein: The isolation fixed resistor is a thin film resistor or a thick film resistor.

8. The circuit board assembly according to any one of claims 1 to 5, wherein: The coupling belt is a straight line structure.

9. A directional coupler, characterized in that: The circuit board assembly comprises a main signal rod and the circuit board assembly according to any one of claims 1 to 8, wherein the main signal rod is spaced apart from the coupling strip to achieve coupling.

10. The directional coupler according to claim 9, wherein The directional coupler further comprises a connecting seat, the main signal rod is located in the connecting seat, the circuit board is fixed on the connecting seat, and the connecting seat is provided with an accommodating groove for accommodating the packaged device.

Images