CN113644422A - Flexible transmission line and antenna integrated assembly - Google Patents

Abstract

The application provides a flexible transmission line and antenna integration subassembly, including transmission line and antenna. Wherein, the transmission line is flexible multilayer zonal structure, and its metal ground plane includes: the top layer, the middle layer and the bottom layer, and the dielectric layer is filled between the layers. The signal lead is arranged between the top layer and the bottom layer and is positioned on the same layer with the middle layer; the intermediate layer and the signal conductor have a gap interval therebetween. The top layer is provided with a feed hole; the feed hole penetrates through the top layer and the dielectric layer, so that the signal wire is connected with the antenna through the feed hole to feed the antenna. In this application, the transmission line is flat form, and thickness is controllable, and the transmission line can directly pass terminal equipment screen back region and be connected with radio frequency module, convenient processing and equipment to shorten signal transmission distance, reduce the space and occupy and promote space utilization, be favorable to the narrow frame and the frivolous design of equipment.

Description

Flexible transmission line and antenna integrated assembly

The present application claims priority from the chinese patent application entitled "an integrated flexible transmission line and antenna assembly" filed by the chinese patent office on 27/4/2020, application number 202010345292.8, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the technical field of radio frequency communication, in particular to a flexible transmission line and antenna integrated assembly.

Background

An antenna of a terminal device with a screen such as a notebook computer generally includes: WLAN antenna, WWAN antenna, GPS antenna, bluetooth antenna, etc., wherein the WLAN antenna and the WWAN antenna can be further divided into a main antenna (WLAN main, WWAN main) and a diversity antenna (WLAN AUX, WWAN AUX). In order to realize multiple wireless signal transmission modes, the number of antennas is increasing, the frequency range to be covered is wider and wider, and the requirements on the environment around the antenna area are gradually increased. For example, the environment around the antenna is as much as possible free of complex metallic environments.

The overall layout of the coaxial cable and the antenna in a typical notebook computer is shown in fig. 1, and includes an antenna 4 and a coaxial cable 5. The antenna 4 is generally designed in the frame area of the upper brim of the screen 2, and the antenna medium adopts a PCB hard board such as FR-4, or directly uses an FPC antenna to be attached on the ABS plastic screen shell 1. The coaxial cable 5 is a radio frequency coaxial cable having a length of about 400mm for transmitting radio frequency signals. One end of the coaxial cable 5 is welded with the antenna 4, and the other end is buckled on the mainboard radio frequency module through an I-PEX head.

However, since the coaxial cable 5 has a relatively large diameter and cannot directly pass through the back surface of the screen 2, the transmission line needs to be fixedly placed along the frame at both sides of the screen. As the number of antennas increases, the number of coaxial cables also increases, which results in widening the width of the frame at the two sides of the screen or increasing the thickness of the frame, and is not favorable for designing the narrow frame of the screen and the light and thin body of the mobile phone. Moreover, the conventional antenna 4 and the coaxial cable 5 are designed separately, so that in the processing process, the assembly difficulty such as manual welding and connector buckling is increased, the transmission performance of radio frequency signals is affected, and the performance degradation such as impedance mismatch and frequency offset is possibly caused.

Disclosure of Invention

The application provides a flexible transmission line and antenna integration subassembly to solve the big problem of traditional condition transmission line occupation space.

The application provides a flexible transmission line and antenna integrated assembly, which comprises an antenna and a transmission line; one end of the transmission line is connected with the antenna, and the other end of the transmission line is connected with the radio frequency module on the main board; the transmission line is of a flexible multi-layer strip structure and comprises a metal grounding layer connected with a metal ground of the equipment, a non-metal dielectric layer between the metal grounding layer and the metal grounding layer, and signal conducting wires arranged in the two metal grounding layers on the surface.

The metal ground layer includes: the non-metal dielectric layer is filled between the adjacent layers; the non-metal dielectric layer is arranged in the joint area among the metal top layer, the metal bottom layer and the middle layer; the signal lead is arranged between the top layer and the bottom layer and is positioned on the same layer with the middle layer; and a gap interval is arranged between the intermediate layer and the signal wire.

The top layer is provided with a feed hole; the feed hole penetrates through the top layer and the dielectric layer between the top layer and the middle layer; the antenna is connected with the signal wire through the feeding hole so as to feed power to the antenna.

Optionally, the metal ground layer further includes a via hole; the conducting hole penetrates through the top layer, the middle layer, the bottom layer and the dielectric layer to be communicated with the top layer, the middle layer and the bottom layer, so that the metal layers are fully grounded.

Optionally, the top layer includes a connecting portion and a wrapping portion; the connecting part is connected with the antenna, and the wrapping part is isolated from the connecting part through an etching process; the feed hole is provided on the connection portion.

Optionally, in a projection area of the connection portion of the top layer to the bottom layer direction, the middle layer and the bottom layer form an antenna clearance area through an etching process.

Optionally, the top layer and the bottom layer are further provided with a protective layer, and the protective layer is an oxidation-resistant film or an insulating film.

Optionally, an exposed area is arranged on the bottom layer, and the bottom layer is connected with a device metal ground through the exposed area.

Optionally, a double-sided conductive adhesive or a double-sided conductive cloth is arranged on the exposed area to adhere the bottom layer to the metal ground of the equipment.

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

Optionally, the dielectric layer is an MPI flexible material; and adhesive layers are also arranged between the medium layer and the top layer, the middle layer and the bottom layer, and the medium layer is pressed at low temperature through the adhesive layers and between the top layer, the middle layer and the bottom layer.

Optionally, the antenna includes a main radiator and a plurality of parasitic branches; one end of the main radiator is connected with the top layer, and the other end of the main radiator is connected with the signal conductor through the feed hole; the parasitic branch bodies are connected with the top layer.

According to the technical scheme, the application provides a flexible transmission line and antenna integrated assembly, which comprises a transmission line and an antenna. Wherein, the transmission line is flexible multilayer band structure, including metal ground plane, non-metal dielectric layer and signal conductor, its metal ground plane includes: the signal lead is arranged between the top layer and the bottom layer and is positioned on the same layer with the middle layer; the intermediate layer and the signal conductor have a gap interval therebetween. The top layer is provided with a feed hole; the feed hole penetrates through the top layer and the dielectric layer, so that the signal wire is connected with the antenna through the feed hole to feed the antenna.

In this application, the transmission line is flat form, and thickness is controllable, and the transmission line can directly pass the screen back region and be connected with radio frequency module, convenient processing and equipment to shorten signal transmission distance, reduce the space and occupy and promote space utilization, be favorable to the narrow frame and the frivolous design of equipment.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic overall layout of a coaxial cable and an antenna in a typical notebook computer;

fig. 2 is a schematic layout diagram of an integrated assembly of a flexible transmission line and an antenna according to the present application;

fig. 3 is a schematic structural diagram of an integrated assembly of a flexible transmission line and an antenna according to the present application;

FIG. 4 is a schematic cross-sectional view of a flexible transmission line according to the present application;

FIG. 5 is a schematic view of a combination position structure of a flexible transmission line and an antenna according to the present application;

FIG. 6 is a diagram illustrating return loss simulation performance in an embodiment of the present application;

fig. 7 is a layout diagram of an application of the integrated assembly of a flexible transmission line and an antenna in a multi-antenna environment.

Detailed Description

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.

The application provides a flexible transmission line and antenna integration subassembly can be applied to electronic communication equipment's antenna design. The antenna design of the notebook computer is described as an example, but the application range of the present application is not limited to the antenna design of the notebook computer, and the present application can also be applied to the antenna design of a tablet computer, a tablet phone antenna, or other electronic communication devices with limited screen or internal space.

Fig. 1 is a schematic overall layout diagram of a coaxial cable and an antenna in a typical notebook computer, as shown in fig. 1, wherein a screen shell 1, a screen 2, and a metal ground 3 below the screen are included on one side of a screen of the notebook computer.

The conventional notebook computer antenna 4 is located in a clearance area above a screen, and an antenna medium generally adopts a Printed Circuit Board (PCB) with large loss such as FR-4, or directly attaches to the ABS plastic screen housing 1 with large loss in the form of a Flexible Printed Circuit (FPC) antenna or a Laser-Direct-structuring (LDS).

The radio frequency coaxial cable 5 is used as a medium for transmitting radio frequency signals to the antenna radiator, one end of the radio frequency coaxial cable is connected to a feed point of the antenna 4 by welding, and the other end of the radio frequency coaxial cable is buckled on the mainboard radio frequency module through an I-PEX head. The length of the radio frequency coaxial cable 5 is generally about 400mm, and the common thickness diameter is RF1.37mm, RF1.13mm and RF0.81mm. Because the diameter of the radio frequency coaxial cable 5 is thick, the radio frequency coaxial cable cannot directly penetrate through the lower part of the screen 2, can only be placed along the side frame of the screen 2, and needs to be grooved for fixing. In order to avoid fixing the slots and fully utilizing the space in the shell of the notebook computer, the application provides a flexible transmission line and antenna integrated assembly.

Fig. 2 is a schematic layout diagram of an integrated assembly of a flexible transmission line and an antenna according to the present application.

Fig. 3 is a schematic structural diagram of an integrated assembly of a flexible transmission line and an antenna according to the present application.

As can be seen from fig. 3, the present application provides a flexible transmission line and antenna integrated assembly, which includes an antenna 6 and a transmission line 7; one end of the transmission line 7 is connected with the antenna 6, and the other end is connected with the radio frequency module on the mainboard; wherein the transmission line 7 is a flexible multi-layer strip structure, and the transmission line 7 comprises a metal ground layer 71 connected with the metal ground 3, and a signal conductor 72 arranged in the metal ground layer 71 on the surface. The signal conducting wire 72 extends from the motherboard rf module of the notebook computer to the position of the antenna 6 along the inside of the metal ground layer 71 to transmit rf signals to the antenna 6.

The transmission line 7 can be a microstrip line, a coplanar waveguide line, a strip line, etc., wherein the strip line is a preferred mode of the transmission line 7, and is composed of an upper grounding metal plane and a lower grounding metal plane and a middle rectangular section conductor.

In order to realize the rf signal transmission, as shown in fig. 5, the metal ground layer 71 includes: a top layer 711, a middle layer 712, and a bottom layer 713, and a non-metallic dielectric layer 714 is disposed at the junction area between the top layer 711, the bottom layer 713, and the middle layer 712. And a space between the metal plane layer and the rectangular conductor is filled with a high-frequency high-polymer flexible material medium. In this application, transmission line 7 form impedance is controlled easily, and shields effectually, is fit for being arranged in the complicated metallic environment of electronic equipment.

The top layer 711, the middle layer 712, and the bottom layer 713 may be made of a Flexible Copper Clad Laminate (FCCL) with good conductivity. The dielectric layer 714 may be made of a high performance flexible material with a low dielectric constant and a low loss tangent, such as: LCP, MPI, PI, PTFE and other plastics. Preferably, the LCP material has the advantages of high comprehensive performance, no need of additionally overlapping adhesive sheets in the multi-layer FCCL lamination at high temperature and the like. Compared with an ABS plastic casing with large loss, the ABS plastic casing with the high-performance material is used as the base material, and the antenna can achieve better radiation performance more easily.

The structure of the antenna 6 is not limited in the present application, and any antenna trace pattern is suitable for the present application. For example, taking the WLAN antenna as an example, the operating frequency band of the antenna 6 is 2.4GHz to 2.5GHz, and 5.15GHz to 5.85 GHz. The antenna 6 comprises a main radiator 61 and a plurality of parasitic branches 62; one end of the main radiator 61 is connected with the top layer 711, and the other end is connected with the signal conductor 72 through the feed hole 73; parasitic dendrons 62 are attached to the top layer 711.

As shown in fig. 4, the signal conductor 72 is disposed between the top layer 711 and the bottom layer 713 at the same level as the middle layer 712; the intermediate layer 712 has a gap spacing from the signal conductor 72. During fabrication, a gap space is formed between the intermediate layer 712 and the signal conductor 72 by etching or the like. That is, the signal wires 72 may also be a flexible copper clad laminate of the same material as the intermediate layer 712. Wrapping the signal conductor 72 within the metal ground layer 71 is achieved by a top layer 711, a middle layer 712, a bottom layer 713, and a dielectric layer 714, such that the transmission line 7 takes the form of a stripline as the transmission line.

In addition, the antenna 6 may be located on the same layer as the top layer 711, and the feeding hole 73 may be provided on the top layer 711. The feed hole 73 penetrates through 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 feed hole 73 to feed the antenna 6.

In practice, the feeding hole 73 may be a plated through hole or a plated through hole disposed on the top layer 711. The radio frequency signal sent by the motherboard radio frequency module can enter the signal wire 72, and is transmitted to the feed hole 73 through the signal wire 72, and is 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 feeding hole 73, and then transmitted to the rf module on the motherboard.

Therefore, as shown in fig. 2, in the same environment, the flexible transmission line and antenna integrated assembly 6 provided by the present application can make full use of the space in the screen shell 1 of the notebook computer and at the back plate of the screen 2, so that the assembly is convenient. The defects that the traditional coaxial cable shown in the figure 1 is too thick and too long and is inconvenient to assemble are overcome. In the embodiment, the thickness of the transmission line 7 in the integrated component is reduced by at least 50% compared with the thickness of the rf coaxial cable 5, and the selectable thicknesses are 0.5mm, 0.4mm, 0.3mm, and the like, because the transmission line is thinner, the transmission line can easily pass through the screen 2 below and directly reach the screen rotating shaft region to be connected with the antenna rf front-end module, and the length is about 200mm, which saves half of the length compared with the rf coaxial cable.

According to the technical scheme, the flexible transmission line and antenna integrated assembly comprises a transmission line 7 and an antenna 6. The transmission line 7 is a flexible multi-layer strip structure, and the signal conducting line 72 is covered by a metal ground layer 71, and the metal ground layer 71 includes: a top layer 711, a middle layer 712 and a bottom layer 713, and a non-metal dielectric layer 714 is filled between the metal ground layer and the metal ground layer. The signal conductor 72 is disposed between the top layer 711 and the bottom layer 713 at the same level as the middle layer 712; the intermediate layer 712 has a gap spacing from the signal conductor 72.

The top layer 711 is provided with a feed hole 73; the feed hole 73 penetrates 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 feed hole 73 to feed the antenna 6. In this application, transmission line 7 is flat form, and thickness is controllable, and transmission line 7 can directly pass the screen back region and be connected with radio frequency module, convenient processing and equipment to shorten signal transmission distance, reduce the space and occupy, promote space utilization, be favorable to the narrow frame and the frivolous design of equipment.

The metal grounding layer 71 is connected with a metal ground of the notebook computer to realize zero potential grounding processing, and the signal conducting wire 72 is wrapped in the metal grounding layer 71, so that a zero potential grounding belt formed by the metal grounding layer 71 can shield the signal conducting wire 72, and external electric signals are prevented from influencing signal transmission of the signal conducting wire 72, so that the metal grounding belt is suitable for being used in a complex metal environment of electronic equipment. Obviously, the top layer 711, the middle layer 712, and the bottom layer 713 of the metal ground 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 conducted.

That is, in some embodiments of the present application, the metal ground layer 71 further includes a via 715; the via hole 715 penetrates the top layer 711, the middle layer 712, the bottom layer 713, and the dielectric layer 714 to communicate 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 grounding of the metal ground layer 71 while ensuring good shielding performance.

It should be noted that, in order not to affect the signal transmission of the signal conducting wire 72, the via 715 cannot penetrate or contact the signal conducting wire 72, and therefore, the via 715 may be disposed at two positions close to the side edges of the top layer 711, i.e., in a paired arrangement. And in order to obtain a better shielding effect, a plurality of vias 715 may be provided on the top layer 711, the middle layer 712, and the bottom layer 713, for example, the vias 715 may be uniformly arranged in the direction along the entire transmission line 7. The via holes 715 may also be metal pillars or blind holes, and the via holes 715 may improve the overall performance of the transmission line 7, ensure sufficient connection between the metal ground layers 71, and reduce electromagnetic energy leakage.

In the present application, the signal conductor 72 is connected to the antenna 6 through the feeding hole 73, and can be adapted to the strip structure of the flexible transmission line 7. Therefore, in order to facilitate installation in the upper frame of the screen of the notebook computer, the antenna 6 may be generally processed to have the same thickness as or similar to the transmission line 7, and since the signal conducting wire 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 ground layer 71, and thus cannot transmit signals, which is not beneficial to external connection of other radio frequency devices, and therefore, a layer-switching design is required at the head and the tail of the transmission line 7. The layer-switching design generally switches 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 turned via hole or blind hole is connected with a conductor pad in a circular or square shape or other shapes to serve as a platform for connecting other devices.

That is, in some embodiments of the present application, the top layer 711 further includes a connecting portion and a wrapping portion. The connecting part is used for connecting the antenna 6 to transmit radio frequency signals; the wrapping portion is used to wrap the signal conductor 72 to achieve a shielding effect. The wrapping part can be isolated from the connecting part through an etching process, so that the influence of grounding treatment on the transmission of radio frequency signals is avoided. The feeding hole 73 is provided in the connection portion, that is, the antenna 6 is connected to the connection portion of the top layer 711 first, and then connected to the signal wire 72 through the feeding hole 73 by the connection portion. In this embodiment, the antenna 6 shares a surface ground plane with the transmission line 7 at the end of the top layer 711 of the transmission line 7.

Further, in a projection region 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 region by an etching process. That is, as shown in fig. 4, the metal ground layer 71 under 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.

In the actual manufacturing process, the antenna 6 and the top layer 711 may be disposed in the same layer, and the connection portion and the wrapping portion of the top layer 711 are isolated by etching a copper layer, and the metal regions (i.e., the middle layer 712 and the bottom layer 713) under the corresponding region of the antenna 6 are all etched away, leaving only the dielectric layer 714, thereby forming an antenna clearance region. Because the WWAN or WLAN antenna form can be implemented by PIFA, IFA, MONOPOLE, LOOP, or coupling parasitic, the formed antenna clearance area can make metal far away from the antenna body, reduce the possibility of metal shielding, and also can change the resonance frequency by changing the size of the clearance area, thereby improving the signal transmission quality. In addition, the formed antenna clearance area can change the division range of the near field and the far field of the antenna to a certain extent so as to adapt to different working environments.

Since the flexible transmission line 7 can extend to the main board of the notebook computer at the back of the screen 2, in practical applications, the screen 2 of the notebook computer can emit a large amount of heat during the display process, and the emitted heat can be transmitted to the top layer 711 (or the bottom layer 713), so that the temperature of the metal ground layer 71 and the signal wires 72 is increased, which affects the signal transmission.

In addition, when the temperature rises, the metal surface of the metal ground layer 71 is easily oxidized at an accelerated rate, and the service life of the transmission line 7 is reduced. Therefore, in some embodiments of the present application, the top layer 711 and the bottom layer 713 are further provided with a protective layer, which is an oxidation preventing film or an insulating film. The anti-oxidation film can protect the copper layer and relieve the oxidation of the copper layer; the insulating film can insulate and isolate the copper layer in the metal grounding layer 71 from other parts in the notebook computer, thereby avoiding influencing the potential states of other parts.

In order to enable the metal ground layer 71 to be grounded so as to maintain a zero potential during operation, the bottom layer 713 is provided with an exposed area through which the bottom layer 713 is connected to the metal ground 3. The metal ground 3 is connected with the casing of the notebook computer device or connected with a grounding pin on a power line so as to maintain zero potential, and after the antenna 6 is installed at a preset position, the exposed area on the bottom layer 713 can contact the metal ground 3, so that the bottom layer 713 is conducted with the metal ground 3. Further, a double-sided conductive adhesive or a double-sided conductive cloth is provided on the exposed area to adhere the bottom layer 713 to the metal ground 3.

In the actual assembly process, the flexible transmission line 7 and the antenna 6 need to be fully grounded with the metal ground 3 below the screen of the notebook computer, so that a copper exposure area needs to be reserved on the surfaces of the upper and lower floors during design so as to facilitate later welding, and a part of the copper exposure area can be reserved on the surface of the bottom layer 713, and double-sided conductive adhesive or double-sided conductive cloth is attached to the copper exposure area.

During assembly, the release paper on the surface of the double-sided conductive adhesive is only required to be stripped, and the double-sided conductive adhesive can be directly adhered to the metal ground 3 below the screen of the notebook computer, so that the assembly is facilitated, and the contact between the bottom layer 713 and the metal ground 3 is firmer. In practical applications, SMT (Surface mount Technology) or soldering process may be used to fully connect the exposed area of the bottom layer 713 with the metal ground 3 behind the notebook computer screen.

In one possible embodiment of the present disclosure, 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 by a high temperature lamination process. The LCP (Liquid Crystal Polymer, industrial Liquid Crystal Polymer) flexible material has excellent heat resistance and molding processability, and can be bonded to the copper layers of the top layer 711, the middle layer 712, and the bottom layer 713 through a high-temperature press-fitting process, thereby functioning as the dielectric layer 714, and reducing the overall thickness of the transmission line 7 without adhesive connection.

In another possible embodiment of the present disclosure, the dielectric layer 714 is an MPI flexible material; adhesive layers are further arranged between the dielectric layer 714 and the top layer 711 and between the middle layer 712 and the bottom layer 713, and the dielectric layer 714 is pressed with the top layer 711, the middle layer 712 and the bottom layer 713 at low temperature through the adhesive layers. The low-temperature pressing can reduce the manufacturing difficulty of the flexible transmission line and save the manufacturing cost.

It should be noted that, in the embodiment of the present invention, for clearly describing the core technical point of the transmission line 7, the simplest stacking structure is adopted, and on the basis of the stacking structure, those skilled in the art can make many variations, and the variations that can be imagined without creative effort are within the protection scope of the present invention. The transmission line 7 of the application can also be flexibly processed, the number of layers is not limited to two layers or 3 layers, the number of signal wires 72 in the transmission line 7 is not limited to 1 or two, the number of layers can be increased or decreased according to the thickness requirement, or the number of radio frequency signal wires 72 can be increased according to the signal transmission requirement, and the number of the antennas 6 can also be correspondingly increased to adapt to the multi-antenna application environment.

In practical application, because the performance of the antenna is easily affected by the surrounding environment, the electromagnetic simulation software needs to be used for simulating the surrounding environment to perform an antenna performance simulation test at the beginning of the design of the flexible transmission line and antenna integrated assembly. In the simulation process, the material characteristics of the integrated assembly need to be consistent with the actual material characteristics, and the environmental characteristics around the antenna 6 need to be consistent with the actual environmental characteristics, including structural characteristics, material characteristics and the like.

For example, a WLAN antenna is designed, a simulation and debugging are performed by simulating an ambient environment, the echo loss simulation performance of the obtained integrated component is shown in fig. 6, and the operating frequency band of S11< -10dB is: 2.27 GHz-2.70 GHz,4.51 GHz-7.65 Hz, the frequency band bandwidth is far wider than the working bandwidth required by the WLAN antenna: 2.4 GHz-2.5 GHz and 5.15 GHz-5.85 GHz. Therefore, even if the actual sample mount is made with a certain frequency offset in the pen-up environment, it may fall within the WLAN operating bandwidth. Even if the deviation is too large, the samples prepared in the first batch can be manually finely adjusted in the actual environment, and the fine adjustment result is used for carrying out second proofing and correction. The design mode avoids the risk that errors are possibly caused by manually welding the antenna by using the traditional radio frequency cable core wire, and the consistency of the performance of the antenna can be ensured.

In the above embodiments, only an example that one radio frequency signal line corresponds to one antenna is described in detail, and in practical application, the flexible transmission line and antenna integrated assembly provided by the present application is also applicable to a multi-antenna environment.

Fig. 7 is an application layout diagram of the flexible transmission line and antenna integrated assembly in the notebook computer under the multi-antenna environment.

It can be seen that in the multi-antenna application environment, the transmission line of the integrated component includes a plurality of rf signal conductors, which are isolated from each other only by the via holes 715 of the metal ground layer 71, and are separated and dispersed at suitable positions to reach the respective connected antennas 6. Therefore, the flexible transmission line and antenna integrated assembly provided by the application can better embody a flexible radio frequency transmission line in a multi-antenna application environment, and has the advantages compared with the traditional radio frequency coaxial cable.

According to the technical scheme, the flexible transmission line and antenna integrated assembly is designed to replace a traditional radio frequency coaxial line welding antenna form in a notebook computer, the transmission line 7 can be designed into a flat form, the thickness is controllable, the two sides of a screen of the notebook computer do not need to be wound like a radio frequency coaxial line, the transmission line 7 part only needs to directly penetrate through the lower part of the screen to reach the screen rotating shaft area and be connected with a radio frequency module, the processing and assembling are convenient, the space utilization rate of equipment is improved, and the narrow frame and light and thin design of the equipment is facilitated. The transmission line 7 and the antenna 6 are integrally formed, so that the manual welding step can be saved, the performances of the antenna such as impedance and the like are not influenced by welding and assembling, the consistency of the antenna performance is kept, and in addition, the antenna 6 utilizes the high-performance medium of the transmission line 7 as a base material to obtain higher gain and efficiency more easily.

The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.

Claims (10)

1. A flexible transmission line and antenna integrated assembly comprises an antenna (6) and a transmission line (7); one end of the transmission line (7) is connected with the antenna (6), and the other end of the transmission line is connected with a radio frequency module on the mainboard; the transmission line (7) is a flexible multilayer strip structure, and the transmission line (7) comprises a metal grounding layer (71) connected with a terminal equipment metal ground (3) and a signal conducting wire (72) arranged in the surface metal grounding layer (71);

the metal ground layer (71) includes: the structure comprises a top layer (711), a middle layer (712) and a bottom layer (713), wherein 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 positioned at the same level with the middle layer (712); the intermediate layer (712) has a gap spacing from the signal conductor (72);

the top layer (711) is provided with a feed hole (73); the feed hole (73) penetrates through the top layer (711) and penetrates through a dielectric layer (714) between the top layer (711) and the middle layer (712); the antenna (6) is connected to the signal conductor (72) through the feed hole (73) to feed the antenna (6).

2. The integrated assembly of flexible transmission line and antenna according to claim 1, characterized in that said metal ground layer (71) further comprises via holes (715); the via hole (715) penetrates through the top layer (711), the intermediate layer (712), the bottom layer (713), and the dielectric layer (714) to communicate the top layer (711), the intermediate layer (712), and the bottom layer (713).

3. The flexible transmission line and antenna integrated assembly of claim 1, wherein the top layer (711) comprises a connection portion and a wrapping portion; the connecting part is connected with the antenna (6), and the wrapping part is isolated from the connecting part through an etching process; the feeding hole (73) is provided on the connection portion.

4. The integrated assembly of a flexible transmission line and an antenna as claimed in claim 3, wherein the middle layer (712) and the bottom layer (713) are formed with an antenna clearance area by an etching process in a projection area of the connection portion of the top layer (711) to the direction of the bottom layer (713).

5. The integrated assembly of flexible transmission line and antenna as claimed in claim 1, wherein the top layer (711) and the bottom layer (713) are further provided with a protective layer, and the protective layer is an oxidation-proof film or an insulating film.

6. The integrated assembly of a flexible transmission line and an antenna as claimed in claim 5, wherein the bottom layer (713) is provided with an exposed region, and the bottom layer (713) is connected with the metal ground (3) through the exposed region.

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

8. The flexible transmission line and antenna integrated assembly of claim 1, wherein the dielectric layer (714) is an LCP flexible material; the dielectric layer (714) is bonded with the top layer (711), the middle layer (712) and the bottom layer (713) through a high-temperature pressing process.

9. The integrated flexible transmission line and antenna assembly of claim 1, wherein the dielectric layer (714) is an MPI flexible material; and adhesive layers are arranged between the dielectric layer (714) and the top layer (711), between the dielectric layer (714) and the bottom layer (713), and the dielectric layer (714) is pressed at low temperature through the adhesive layers and the top layer (711), between the dielectric layer (712) and the bottom layer (713).

10. The integrated assembly of a flexible transmission line and an antenna according to claim 1, characterized in that said antenna (6) comprises a main radiator (61) and a plurality of parasitic stubs (62); one end of the main radiator (61) is connected with the top layer (711), and the other end of the main radiator is connected with the signal conductor (72) through the feed hole (73); the parasitic dendron (62) is connected to the top layer (711).

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