A flexible transmission line and antenna integrated component

Abstract

The present application provides a flexible transmission line and antenna integrated component, including a transmission line and an antenna. Among them, the transmission line is a flexible multi-layer strip structure, and its metal grounding layer includes: a top layer, a middle layer and a bottom layer, and a dielectric layer is filled between the layers. The signal conductor is arranged between the top layer and the bottom layer, and is located at the same level as the middle layer; there is a gap between the middle layer and the signal conductor. A feeding hole is provided in the top layer; the feeding hole runs through the top layer and the dielectric layer, so that the signal conductor is connected to the antenna through the feeding hole to feed the antenna. In the present application, the transmission line is flat in form and has a controllable thickness. The transmission line can directly pass through the back area of ​​the terminal device screen to connect to the radio frequency module, which is convenient for processing and assembly, and shortens the signal transmission distance, reduces space occupancy and improves space utilization, which is conducive to the narrow frame and light and thin design of the device.

Description

[0001] This application claims priority to a Chinese patent application filed with the Chinese Patent Office on April 27, 2020, with application number 202010345292.8 and invention name “A flexible transmission line and antenna integrated component”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of radio frequency communication technology, and in particular to an integrated assembly of a flexible transmission line and an antenna. Background Art

[0003] The antennas of terminal devices with screens, such as laptops, generally include: WLAN antennas, WWAN antennas, GPS antennas, Bluetooth antennas, etc. Among them, WLAN antennas and WWAN antennas can be divided into main antennas (WLAN main, WWAN main) and diversity antennas (WLAN AUX, WWAN AUX). In order to realize various wireless signal transmission methods, the number of antennas is increasing, and the frequency band range that needs to be covered is getting wider and wider, and the requirements for the environment around the antenna area are gradually increasing. For example, try to avoid complex metal environments around the antenna.

[0004] The overall layout of the coaxial cable and antenna in a typical laptop is as follows: Figure 1 As shown, it includes an antenna 4 and a coaxial cable 5. Generally, the antenna 4 is designed in the frame area of ​​the upper eaves of the screen 2, and the antenna medium uses a PCB hard board such as FR-4, or directly uses an FPC antenna to stick on the ABS plastic screen shell 1. The coaxial cable 5 uses a radio frequency coaxial cable with a length of about 400mm to transmit the radio frequency signal. One end of the coaxial cable 5 is welded to the antenna 4, and the other end is buckled on the mainboard radio frequency module through an I-PEX head.

[0005] However, since the diameter of the coaxial cable 5 is relatively thick, it cannot directly pass through the back of the screen 2, so the transmission line needs to be fixed along the grooves opened on both sides of the screen frame. As the number of antennas increases, the number of coaxial cables also increases accordingly, which will cause the width of the frames on both sides of the screen to widen or the thickness of the frames to thicken, which is not conducive to the narrow frame design of the screen and the thin and light body design. In addition, the traditional antenna 4 and the coaxial cable 5 are designed separately. During the processing, it will increase the difficulty of manual welding, connector buckling and other assembly, affecting the transmission performance of the RF signal, and may cause impedance mismatch, frequency offset and other performance degradation problems. Summary of the invention

[0006] The present application provides an integrated assembly of a flexible transmission line and an antenna to solve the problem that traditional conditional transmission lines occupy a large space.

[0007] The present application provides a flexible transmission line and antenna integrated component, including an antenna and a transmission line; one end of the transmission line is connected to the antenna, and the other end is connected to a radio frequency module on a mainboard; the transmission line is a flexible multi-layer strip structure, and the transmission line includes a metal grounding layer connected to the metal ground of the device, a non-metallic dielectric layer between the metal grounding layer and the metal grounding layer, and a signal conductor arranged in two metal grounding layers located on the surface.

[0008] The metal grounding layer includes: a top layer, a middle layer, and a bottom layer, and a non-metallic dielectric layer is filled between adjacent layers; the non-metallic dielectric layer is arranged in the joint area between the metal top layer, the bottom layer and the middle layer; the signal wire is arranged between the top layer and the bottom layer and is located at the same level as the middle layer; there is a gap between the middle layer and the signal wire.

[0009] A feeding hole is provided on the top layer; the feeding hole penetrates the top layer and the dielectric layer between the top layer and the middle layer; the antenna is connected to the signal wire through the feeding hole to feed power to the antenna.

[0010] Optionally, the metal grounding layer further includes a via hole; the via hole penetrates the top layer, the middle layer, the bottom layer and the dielectric layer to connect the top layer, the middle layer and the bottom layer to ensure that each metal layer is adequately grounded.

[0011] Optionally, the top layer includes a connecting portion and a wrapping portion; the connecting portion is connected to the antenna, and the wrapping portion is isolated from the connecting portion by an etching process; and the feeding hole is arranged on the connecting portion.

[0012] Optionally, within a projection area of ​​the connection portion of the top layer toward the bottom layer, the middle layer and the bottom layer form an antenna clearance area through an etching process.

[0013] Optionally, a protective layer is further provided on the top layer and the bottom layer, and the protective layer is an anti-oxidation film or an insulating film.

[0014] Optionally, an exposed area is provided on the bottom layer, and the bottom layer is connected to a metal ground of the device through the exposed area.

[0015] Optionally, double-sided conductive adhesive or double-sided conductive cloth is provided on the exposed area to adhere the bottom layer to the metal ground of the device.

[0016] Optionally, the dielectric layer is an LCP flexible material; the dielectric layer is bonded to the top layer, the middle layer and the bottom layer through a high-temperature pressing process.

[0017] Optionally, the dielectric layer is an MPI flexible material; an adhesive layer is further provided between the dielectric layer and the top layer, the middle layer and the bottom layer, and the dielectric layer is low-temperature pressed with the top layer, the middle layer and the bottom layer through the adhesive layer.

[0018] Optionally, the antenna includes a main radiator and a plurality of parasitic branches; one end of the main radiator is connected to the top layer, and the other end is connected to the signal wire through the feeding hole; the parasitic branches are connected to the top layer.

[0019] It can be seen from the above technical solution that the present application provides a flexible transmission line and antenna integrated component, including a transmission line and an antenna. Among them, the transmission line is a flexible multi-layer strip structure, including a metal grounding layer, a non-metallic dielectric layer and a signal conductor, and its metal grounding layer includes: a top layer, a middle layer and a bottom layer, and the signal conductor is arranged between the top layer and the bottom layer, and is located at the same level as the middle layer; there is a gap between the middle layer and the signal conductor. A feeding hole is provided on the top layer; the feeding hole runs through the top layer and the dielectric layer, so that the signal conductor is connected to the antenna through the feeding hole to feed the antenna.

[0020] In this application, the transmission line is flat in form and has controllable thickness. The transmission line can directly pass through the back area of ​​the screen to connect to the RF module, which is convenient for processing and assembly, shortens the signal transmission distance, reduces space occupancy and improves space utilization, which is conducive to the narrow bezel and lightweight design of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a schematic diagram of the overall layout of the coaxial cable and antenna in a typical laptop computer;

[0023] Figure 2 A schematic diagram of the layout of a flexible transmission line and antenna integrated component for this application;

[0024] Figure 3 This is a schematic diagram of the structure of a flexible transmission line and antenna integrated assembly for this application;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the flexible transmission line of this application;

[0026] Figure 5 This is a schematic diagram of the structure of the flexible transmission line and the antenna combined position of this application;

[0027] Figure 6This is a schematic diagram of return loss simulation performance in an embodiment of the present application;

[0028] Figure 7 This is the application layout diagram of the flexible transmission line and antenna integrated component in a multi-antenna environment of this application. DETAILED DESCRIPTION

[0029] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0030] The flexible transmission line and antenna integrated assembly provided by the present application can be applied to the antenna design of electronic communication equipment. The present application embodiment will be described by taking the antenna design of a laptop computer as an example, but the application scope of the present application is not limited to the antenna design of a laptop computer, and can also be applied to the antenna design of a tablet computer, a tablet mobile phone, or other electronic communication equipment with a screen or limited internal space.

[0031] Figure 1 The schematic diagram of the overall layout of the coaxial cable and antenna in a typical laptop computer is shown in FIG. Figure 1 As shown, the screen side of the laptop computer includes a screen housing 1, a screen 2, and a metal ground 3 under the screen.

[0032] The antenna 4 of a traditional laptop computer is located in the clear area above the screen. The antenna medium generally uses a PCB (Printed Circuit Board) with high loss, such as FR-4, or directly uses an FPC (Flexible Printed Circuit) antenna or an LDS (Laser-Direct-structuring) antenna attached to an ABS plastic screen housing 1 with high loss.

[0033] The RF coaxial cable 5 serves as a medium for transmitting RF signals to the antenna radiator. One end of the RF coaxial cable 5 is connected to the feeding point of the antenna 4 by welding, and the other end is fastened to the mainboard RF module through an I-PEX head. The length of the RF coaxial cable 5 is generally around 400 mm, and the commonly used thickness diameters are RF1.37 mm, RF1.13 mm, and RF0.81 mm. Due to the relatively thick diameter of the RF coaxial cable 5, it cannot pass directly under the screen 2 and can only be placed along the side frame of the screen 2, and a groove is required for fixing. In order to avoid slotting and to make full use of the space inside the laptop computer casing, the present application provides an integrated flexible transmission line and antenna assembly.

[0034] See also Figure 2 , which is a schematic layout diagram of a flexible transmission line and antenna integrated component of the present application.

[0035] See also Figure 3 , which is a structural schematic diagram of a flexible transmission line and antenna integrated component of the present application.

[0036] Depend on Figure 3 It can be seen that the present application provides a flexible transmission line and antenna integrated component, including an antenna 6 and a transmission line 7; one end of the transmission line 7 is connected to the antenna 6, and the other end is connected to the RF module on the motherboard; wherein the transmission line 7 is a flexible multi-layer strip structure, and the transmission line 7 includes a metal grounding layer 71 connected to the metal ground 3, and a signal wire 72 arranged in the metal grounding layer 71 on the surface. The signal wire 72 extends from the RF module of the motherboard of the laptop along the inside of the metal grounding layer 71 to the position of the antenna 6 to transmit the RF signal to the antenna 6.

[0037] The routing form of the transmission line 7 can be a microstrip line, a coplanar waveguide line, a stripline, etc. Among them, the stripline is a preferred routing form of the transmission line 7, which is composed of upper and lower grounded metal planes and a rectangular cross-section conductor in the middle.

[0038] In order to achieve RF signal transmission, such as Figure 5 As shown, the metal grounding layer 71 includes: a top layer 711, a middle layer 712 and a bottom layer 713, and the non-metal dielectric layer 714 is arranged in the joint area between the top layer 711, the bottom layer 713 and the middle layer 712. The space between the metal plane layer and the rectangular conductor is filled with a high-frequency polymer flexible material medium. In the present application, the impedance of the transmission line 7 is easy to control and the shielding effect is good, which is suitable for use in a complex metal environment of electronic equipment.

[0039] The top layer 711, the middle layer 712, and the bottom layer 713 can be made of flexible copper clad laminates (FCCL, Flexible Copper Clad Laminate, soft copper foil substrate) with good conductivity. The dielectric layer 714 can be made of high-performance flexible materials with low dielectric constant and low loss tangent value, such as: LCP, MPI, PI, PTFE and other plastics. Preferably, LCP material has the advantages of high comprehensive performance and no need to stack adhesive sheets for multi-layer FCCL lamination at high temperature. Compared with the ABS plastic casing with higher loss, the present application uses high-performance materials as the substrate, which can make it easier for the antenna to achieve better radiation performance.

[0040] The present application does not limit the structure of the antenna 6, and any antenna routing pattern is applicable to the present application. For example, taking the WLAN antenna as an example, the operating frequency band of the antenna 6 is 2.4GHz~2.5GHz, 5.15GHz~5.85GHz. The antenna 6 includes a main radiator 61 and a plurality of parasitic branches 62; one end of the main radiator 61 is connected to the top layer 711, and the other end is connected to the signal wire 72 through the feeding hole 73; the parasitic branches 62 are connected to the top layer 711.

[0041] like Figure 4 As shown, the signal conductor 72 is arranged between the top layer 711 and the bottom layer 713, and is located at the same level as the middle layer 712; there is a gap between the middle layer 712 and the signal conductor 72. During the manufacturing process, a gap is formed between the middle layer 712 and the signal conductor 72 by etching and other processes. That is, the signal conductor 72 can also be a flexible copper-clad board with the same material as the middle layer 712. Through the top layer 711, the middle layer 712, the bottom layer 713 and the dielectric layer 714, the signal conductor 72 can be wrapped in the metal grounding layer 71, so that the transmission line 7 adopts a strip line as the transmission line form.

[0042] In addition, the antenna 6 can also be located at the same level as the top layer 711, and a feeding hole 73 is provided on the top layer 711. The feeding hole 73 penetrates the top layer 711 and the dielectric layer 714 between the top layer 711 and the middle layer 712; the antenna 6 is connected to the signal wire 72 through the feeding hole 73 to feed the antenna 6.

[0043] In practical applications, the feed hole 73 can be a metalized blind hole or through hole set on the top layer 711. The RF signal emitted by the mainboard RF module can first enter the signal wire 72, and be transmitted to the feed hole 73 through the signal wire 72, and then be transmitted to the antenna 6 through the feed hole 73; similarly, the signal received by the antenna 6 is also transmitted to the signal wire 72 through the feed hole 73, and then transmitted to the RF module on the mainboard.

[0044] It can be seen that Figure 2 As shown, under the same environment, the flexible transmission line and antenna integrated assembly 6 provided by the present application can fully utilize the space at the back panel of the screen 2 in the laptop screen housing 1 to facilitate assembly. Figure 1 The traditional coaxial cable shown in the figure is too thick and too long, and is inconvenient to assemble. The transmission line 7 in the integrated component has a thickness of at least 50% lower than that of the RF coaxial cable 5 in this embodiment, and the optional thickness is 0.5mm, 0.4mm, 0.3mm, etc. Due to its thin thickness, it can easily pass through the bottom of the screen 2 directly to the screen hinge area and connect to the antenna RF front-end module. The length is about 200mm, which saves half the length compared to the RF coaxial line.

[0045] It can be seen from the above technical solution that the present application provides a flexible transmission line and antenna integrated component, including a transmission line 7 and an antenna 6. The transmission line 7 is a flexible multi-layer strip structure, and the signal conductor 72 is covered by a metal grounding layer 71, and the metal grounding layer 71 includes: a top layer 711, an intermediate layer 712 and a bottom layer 713, and a non-metallic dielectric layer 714 is filled between the metal grounding layer and the metal grounding layer. The signal conductor 72 is arranged between the top layer 711 and the bottom layer 713, and is located at the same level as the intermediate layer 712; there is a gap between the intermediate layer 712 and the signal conductor 72.

[0046] A feeding hole 73 is provided on the top layer 711; the feeding hole 73 passes through the top layer 711 and the dielectric layer 714 between the top layer 711 and the middle layer 712; the signal wire 72 is connected to the antenna 6 through the feeding hole 73 to feed the antenna 6. In the present application, the transmission line 7 is in a flat form with a controllable thickness. The transmission line 7 can directly pass through the back area of ​​the screen to connect with the RF module, which is convenient for processing and assembly, shortens the signal transmission distance, reduces space occupation, improves space utilization, and is conducive to the narrow frame and thin design of the device.

[0047] The metal grounding layer 71 is connected to the metal ground of the laptop computer to achieve zero potential grounding. Since the metal grounding layer 71 wraps the signal wire 72, the zero potential grounding strip formed by the metal grounding layer 71 can shield the signal wire 72 to prevent external electrical signals from affecting the signal transmission of the signal wire 72, so that it is suitable for use in complex metal environments of electronic equipment. Obviously, the top layer 711, the middle layer 712 and the bottom layer 713 in the metal grounding layer 71 need to be grounded to maintain zero potential, so the top layer 711, the middle layer 712 and the bottom layer 713 can be turned on.

[0048] That is, in some embodiments of the present application, the metal grounding layer 71 further includes a via 715; the via 715 penetrates the top layer 711, the middle layer 712, the bottom layer 713 and the dielectric layer 714 to connect the top layer 711, the middle layer 712 and the bottom layer 713. By conducting the top layer 711, the middle layer 712 and the bottom layer 713, after any one of the top layer 711, the middle layer 712 and the bottom layer 713 is grounded, the other two layers can maintain zero potential, which facilitates the grounding of the metal grounding layer 71 while ensuring good shielding performance.

[0049] It should be noted that in order not to affect the signal transmission of the signal wire 72, the via 715 cannot penetrate or contact the signal wire 72, so the via 715 can be set at two positions close to the side of the top layer 711, that is, arranged in pairs. And in order to obtain a better shielding effect, multiple vias 715 can be set on the top layer 711, the middle layer 712 and the bottom layer 713. For example, the vias 715 can be evenly arranged along the direction of the entire transmission line 7. The via 715 can also be a metal column or a blind hole. The via 715 can improve the overall performance of the transmission line 7, ensure that the metal grounding layers 71 are fully connected, and reduce electromagnetic energy leakage.

[0050] In the present application, the signal conductor 72 is connected to the antenna 6 through the feed hole 73, which can adapt to the strip structure of the flexible transmission line 7. Therefore, in order to facilitate installation in the frame above the screen of the laptop computer, the antenna 6 can generally be processed to have the same or similar thickness as the transmission line 7. Since the signal conductor 72 of the strip line is located at the level of the middle layer 712, the main radiator of the antenna 6 will contact the top layer 711 of the metal grounding layer 71, so that the signal cannot be transmitted, which is not conducive to external connection of other radio frequency devices. Therefore, a layer transfer design is required at the beginning and end of the transmission line 7. The layer transfer design generally transfers the signal conductor of the middle layer 712 to the top layer 711 through a via hole or a blind hole, and the surface of the transferred via hole or blind hole is connected to a circular, square or other shaped conductor pad as a platform for external connection of other devices.

[0051] That is, in some embodiments of the present application, the top layer 711 also includes a connecting portion and a wrapping portion. Among them, the connecting portion is used to connect the antenna 6 to transmit the radio frequency signal; the wrapping portion is used to wrap the signal wire 72 to achieve a shielding effect. The wrapping portion can be isolated from the connecting portion by an etching process to prevent the grounding process from affecting the transmission of the radio frequency signal. In addition, the feeding hole 73 is arranged on the connecting portion, that is, the antenna 6 is first connected to the connecting portion of the top layer 711, and then the connecting portion is connected to the signal wire 72 through the feeding hole 73. In this embodiment, the antenna 6 is at the end of the top layer 711 of the transmission line 7, and shares the surface grounding layer with the transmission line 7.

[0052] Furthermore, in the projection area of ​​the connection portion of the top layer 711 toward the bottom layer 713, the middle layer 712 and the bottom layer 713 form an antenna clearance area through an etching process. Figure 4 As shown, the metal ground layer 71 below the design area of ​​the antenna 6 is hollowed out to form an antenna clearance area, so that the antenna 6 and the transmission line 7 share the same low dielectric constant and low dielectric loss material dielectric layer 714.

[0053] In the actual processing process, the antenna 6 and the top layer 711 can be set to the same layer, and the connection part and the wrapping part of the top layer 711 can be isolated by etching the copper layer. The metal area below the corresponding area of ​​the antenna 6 (i.e., the middle layer 712 and the bottom layer 713) are all etched away, leaving only the dielectric layer 714 to form an antenna clearance area. Since the WWAN or WLAN antenna form can be implemented by PIFA, IFA, MONOPOLE, LOOP or coupled parasitics, the antenna clearance area formed can keep the metal away from the antenna body, reduce the possibility of metal shielding, and can also change the resonant frequency by changing the size of the clearance area to improve the signal transmission quality. In addition, the antenna clearance area formed can also change the division range of the antenna near field and far field to a certain extent to adapt to different working environments.

[0054] Since the flexible transmission line 7 can extend from the back of the screen 2 to the motherboard of the laptop computer, in actual applications, the screen 2 of the laptop computer will dissipate a large amount of heat during the display process, and the dissipated heat will likely be transferred to the top layer 711 (or the bottom layer 713), causing the temperature of the metal ground layer 71 and the signal conductor 72 to rise, affecting signal transmission.

[0055] Moreover, when the temperature rises, the metal surface of the metal grounding layer 71 is prone to accelerated oxidation, which reduces the service life of the transmission line 7. Therefore, in some embodiments of the present application, a protective layer is also provided on the top layer 711 and the bottom layer 713, and the protective layer is an anti-oxidation film or an insulating film. The anti-oxidation film can protect the copper layer and alleviate the oxidation of the copper layer; the insulating film can insulate and isolate the copper layer in the metal grounding layer 71 from other components in the laptop computer to avoid affecting the potential state of other components.

[0056] In order to enable the metal grounding layer 71 to achieve grounding so as to maintain zero potential during operation, an exposed area is provided on the bottom layer 713, and the bottom layer 713 is connected to the metal ground 3 through the exposed area. The metal ground 3 is connected to the shell of the notebook device or to the ground pin on the power line to maintain zero potential. After the antenna 6 is installed at a predetermined position, the exposed area on the bottom layer 713 can contact the metal ground 3, so that the bottom layer 713 is connected to the metal ground 3. Furthermore, double-sided conductive adhesive or double-sided conductive cloth is provided on the exposed area to adhere the bottom layer 713 to the metal ground 3.

[0057] In the actual assembly process, the flexible transmission line 7 and the antenna 6 need to be fully grounded to the metal ground 3 under the laptop screen. Therefore, when designing, it is necessary to leave exposed copper areas on the upper and lower ground plane surfaces to facilitate subsequent welding. Alternatively, only a partial exposed copper area can be left on the surface of the bottom layer 713, and double-sided conductive adhesive or double-sided conductive cloth can be attached to the area.

[0058] During assembly, just peel off the release paper on the double-sided conductive adhesive surface and directly stick it on the metal ground 3 below the laptop screen, which is convenient for assembly and makes the contact between the bottom layer 713 and the metal ground 3 more solid. In practical applications, SMT (Surface Mounted Technology) or welding technology can also be used to fully connect the exposed area of ​​the bottom layer 713 with the metal ground 3 behind the laptop screen.

[0059] In a feasible technical solution of the present application, the dielectric layer 714 is an LCP flexible material; the dielectric layer 714 is bonded to the top layer 711, the middle layer 712 and the bottom layer 713 through a high-temperature pressing process. The LCP (Liquid Crystal Polymer, industrialized liquid crystal polymer) flexible material has excellent heat resistance and molding processing performance, and can be bonded to the copper layer of the top layer 711, the middle layer 712 and the bottom layer 713 through a high-temperature pressing process, thereby playing the role of the dielectric layer 714, and no adhesive connection is required, thereby reducing the overall thickness of the transmission line 7.

[0060] In another feasible technical solution of the present application, the dielectric layer 714 is an MPI flexible material; an adhesive layer is also provided between the dielectric layer 714 and the top layer 711, the middle layer 712 and the bottom layer 713, and the dielectric layer 714 is low-temperature pressed together with the top layer 711, the middle layer 712 and the bottom layer 713 through the adhesive layer. Low-temperature pressing can reduce the manufacturing difficulty of the flexible transmission line and save manufacturing costs.

[0061] It should be noted that in order to clearly describe the core technical points of the transmission line 7 in the embodiment of the present application, the simplest stacking structure is adopted. On the basis of the stacking structure, those skilled in the art can also make many deformations. Without paying creative labor, many deformations that can be imagined are within the protection scope of the present invention. The transmission line 7 of the present application can also be flexibly processed. The number of layers is not limited to two or three layers, and the signal wires 72 in the transmission line 7 are not limited to one or two. The number of layers can be increased or decreased according to the thickness requirements, or the number of RF signal wires 72 can be increased according to the signal transmission requirements. The number of antennas 6 can also be increased accordingly to adapt to the multi-antenna application environment.

[0062] In practical applications, since antenna performance is easily affected by the surrounding environment, electromagnetic simulation software is required to simulate the surrounding environment for antenna performance simulation tests at the beginning of the design of the flexible transmission line and antenna integrated component. During the simulation process, the material properties used in the integrated component must be consistent with the actual material properties, and the surrounding environment properties of the antenna 6 must be consistent with the actual environment properties, including structural properties and material properties.

[0063] For example, when designing a WLAN antenna, the surrounding environment is simulated for simulation debugging, and the return loss simulation performance of the integrated component is obtained. Figure 6 As shown, its operating frequency band with S11 < -10dB is: 2.27GHz ~ 2.70GHz, 4.51GHz ~ 7.65Hz, and the frequency band bandwidth is much wider than the operating bandwidth required by WLAN antennas: 2.4GHz ~ 2.5GHz, 5.15GHz ~ 5.85GHz. Therefore, even if the actual sample mounting has a certain frequency offset in the laptop environment, it may fall within the WLAN operating bandwidth. Even if the deviation is too large, the first batch of samples can be manually fine-tuned in the actual environment, and the results of the fine-tuning can be used for the second proofing for correction. This design method avoids the risk of errors that may be caused by manually welding antennas with traditional RF cable core wires, and can better ensure the consistency of antenna performance.

[0064] The above embodiment only describes in detail an example in which one radio frequency signal line corresponds to one antenna. In actual applications, the flexible transmission line and antenna integrated assembly provided by the present application is also applicable to a multi-antenna environment.

[0065] Figure 7 This is the application layout diagram of the flexible transmission line and antenna integrated component in a laptop computer in a multi-antenna environment.

[0066] It can be seen that in a multi-antenna application environment, the integrated component transmission line contains multiple RF signal conductors, which can be isolated by the vias 715 of the metal grounding layer 71 to achieve mutual non-influence, and separated and diverged at appropriate positions to reach the respective connected antennas 6. It can be seen that the flexible transmission line and antenna integrated component provided by the present application can better reflect the superiority of the flexible RF transmission line over the traditional RF coaxial cable in a multi-antenna application environment.

[0067] It can be seen from the above technical solutions that this application replaces the traditional RF coaxial line welding antenna in the laptop computer by designing a flexible transmission line and antenna integrated assembly. The transmission line 7 can be designed to be flat with controllable thickness. It does not need to be wrapped around the two sides of the laptop screen like the RF coaxial line. The transmission line 7 part only needs to pass directly under the screen to reach the screen hinge area and connect with the RF module. It is easy to process and assemble, improves the space utilization of the equipment, and is conducive to the narrow frame and light and thin design of the equipment. The integrated molding of the transmission line 7 and the antenna 6 can not only save the manual welding steps, but also the antenna impedance and other performances are not affected by the welding assembly, which is conducive to maintaining the consistency of the antenna performance. In addition, the antenna 6 uses the high-performance medium of the transmission line 7 as the substrate to more easily obtain higher gain and efficiency.

[0068] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A flexible transmission line and antenna integrated component, comprising an antenna (6) and a transmission line (7); one end of the transmission line (7) is connected to the antenna (6), and the other end is connected to a radio frequency module on a mainboard; characterized in that: The transmission line (7) is a flexible multi-layer strip structure, and comprises a metal grounding layer (71) connected to the metal ground (3) of the terminal device, and a signal conductor (72) arranged in the surface metal grounding layer (71); The metal grounding layer (71) comprises: a top layer (711), a middle layer (712), and a bottom layer (713); a non-metal dielectric layer (714) is filled between adjacent layers; the non-metal dielectric layer (714) is arranged in a joint area between the top layer (711), the bottom layer (713) and the middle layer (712); the signal conductor (72) is arranged between the top layer (711) and the bottom layer (713) and is located at the same level as the middle layer (712); a gap is provided between the middle layer (712) and the signal conductor (72); A feeding hole (73) is provided on the top layer (711); the feeding hole (73) penetrates the top layer (711) and the dielectric layer (714) between the top layer (711) and the middle layer (712); the antenna (6) is connected to the signal wire (72) through the feeding hole (73) so as to feed power to the antenna (6); The metal grounding layer (71) further comprises a via hole (715); the via hole (715) penetrates the top layer (711), the middle layer (712), the bottom layer (713) and the dielectric layer (714) to connect the top layer (711), the middle layer (712) and the bottom layer (713); wherein the via holes (715) are evenly arranged in a direction along the entire transmission line (7).

2. The flexible transmission line and antenna integrated assembly according to claim 1, characterized in that: The top layer (711) comprises a connecting portion and a wrapping portion; the connecting portion is connected to the antenna (6), and the wrapping portion is isolated from the connecting portion by an etching process; and the feeding hole (73) is arranged on the connecting portion.

3. The flexible transmission line and antenna integrated assembly according to claim 2, characterized in that: In the projection area of ​​the connection portion of the top layer (711) toward the bottom layer (713), the middle layer (712) and the bottom layer (713) form an antenna clearance area through an etching process.

4. The flexible transmission line and antenna integrated assembly according to claim 1, characterized in that: A protective layer is also provided on the top layer (711) and the bottom layer (713), and the protective layer is an anti-oxidation film or an insulating film.

5. The flexible transmission line and antenna integrated assembly according to claim 4, characterized in that: An exposed area is provided on the bottom layer (713), and the bottom layer (713) is connected to the metal ground (3) through the exposed area.

6. The flexible transmission line and antenna integrated assembly according to claim 5, characterized in that: The exposed area is provided with double-sided conductive adhesive or double-sided conductive cloth to adhere the bottom layer (713) to the metal ground (3).

7. The flexible transmission line and antenna integrated assembly according to claim 1, characterized in that: The dielectric layer (714) is an LCP flexible material; the dielectric layer (714) is bonded to the top layer (711), the middle layer (712) and the bottom layer (713) through a high-temperature pressing process.

8. The flexible transmission line and antenna integrated assembly according to claim 1, characterized in that: The dielectric layer (714) is an MPI flexible material; an adhesive layer is also provided between the dielectric layer (714) and the top layer (711), the middle layer (712) and the bottom layer (713); the dielectric layer (714) is low-temperature pressed together with the top layer (711), the middle layer (712) and the bottom layer (713) through the adhesive layer.

9. The flexible transmission line and antenna integrated assembly according to claim 1, characterized in that: The antenna (6) comprises a main radiator (61) and a plurality of parasitic branches (62); one end of the main radiator (61) is connected to the top layer (711), and the other end is connected to the signal wire (72) through the feeding hole (73); the parasitic branches (62) are connected to the top layer (711).

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