CN113675569A

CN113675569A - Communication equipment and coupler thereof

Info

Publication number: CN113675569A
Application number: CN202010414789.0A
Authority: CN
Inventors: 赵修茂
Original assignee: Anhui Tatfook Technology Co Ltd
Current assignee: Anhui Tatfook Technology Co Ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2021-11-19
Anticipated expiration: 2040-05-15
Also published as: CN113675569B

Abstract

The application discloses communication equipment and coupler thereof, this coupler include PCB board, coupling piece and metal covering, and the coupling piece sets up in the first surface of PCB board, and the second surface of PCB board is provided with first recess, and the projection of coupling piece on the PCB board overlaps with first recess portion, and the metal covering sets up on first recess. This application is through setting up first recess on the PCB board to the projection of coupling piece on the PCB board overlaps with first recess, changes the structure of coupler itself, realizes improving the directionality of coupler.

Description

Communication equipment and coupler thereof

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication device and a coupler thereof.

Background

In a mobile communication device, a coupler is required to couple out a radio frequency signal in a main circuit with a certain degree of coupling, so as to realize observation or testing of the radio frequency signal. One measure of the ability of a coupler to discriminate between incident and reflected waves in a transmission system is the directivity of the coupler, which affects the accuracy of the measurements of rf power, voltage standing wave ratio, and return loss. And limited by the structure of the coupler, the directivity parameters of the coupler have certain limits. In the prior art, an adjustable coupling mechanism is additionally arranged on a coupler, so that an electric field between the coupler and a main circuit is changed, the directivity of the coupler is changed, but the insertion loss, the return loss and the like of a radio frequency signal can be caused to change.

Disclosure of Invention

The present application provides a communication device and a coupler thereof to solve the above-mentioned problems in the prior art.

In order to solve the technical problem, the present application provides a coupler, which includes a PCB, a coupling piece and a metal cover, wherein the coupling piece is disposed on a first surface of the PCB, a second surface of the PCB is provided with a first groove, a projection of the coupling piece on the PCB overlaps with the first groove, and the metal cover is disposed on the first groove.

Wherein, the PCB board includes: the coupling sheet is arranged on the first surface of the first medium layer; the first metal layer is laid on the first surface of the first dielectric layer; the second metal layer is laid on the second surface of the first dielectric layer; the second dielectric layer is arranged on the second metal layer; the third metal layer is laid on the surface of the second dielectric layer far away from the first dielectric layer; the second metal layer, the second dielectric layer and the third metal layer are provided with a first groove.

The coupler further comprises a plurality of threaded rods, the metal cover is provided with a plurality of threaded holes, and the threaded rods are mounted in the threaded holes.

Wherein, a surface of the metal cover close to the coupling sheet is provided with a second groove.

In order to solve the above technical problem, the present application provides a communication device, which includes a coupler, a main rod and a casing, wherein the main rod is disposed in the casing, and a coupling window is disposed on the casing for accommodating the coupler, and the coupler is coupled to the main rod.

The coupler comprises a PCB, a coupling sheet and a metal cover, wherein the coupling sheet is arranged on the PCB, the PCB is provided with a first groove, the metal cover is arranged on the first groove and used for covering the first groove, and the projection of the metal cover on the PCB is overlapped with the projection part of the coupling sheet on the PCB; wherein, a surface of the metal cover close to the coupling sheet is provided with a second groove.

Wherein, the PCB board includes: the first medium layer is provided with a first surface and a second surface which are oppositely arranged, and the coupling sheet is arranged on the first surface of the first medium layer; the first metal layer is laid on the first surface of the dielectric layer; the second metal layer is laid on the second surface of the first dielectric layer; the second dielectric layer is arranged on the second metal layer; the third metal layer is laid on the surface of the second dielectric layer far away from the first dielectric layer; the second metal layer, the second dielectric layer and the third metal layer are provided with a first groove.

The shell comprises a columnar side wall and a hollow inner cavity formed by the columnar side wall, and the hollow inner cavity is used for accommodating the main rod; wherein, the shell is a metal shell.

The working frequency band of the communication equipment is as follows: 3.36-3.66 GHz.

The beneficial effect of this application is: be different from prior art, this application sets up first recess on the PCB board to with the metal covering setting on first recess, change the structure of coupler itself, realize improving the directionality of coupler. In addition, the projection of the metal cover on the PCB covers the projection of the first groove on the PCB, so that the metal cover completely shields the first groove, the coupling signal is prevented from overflowing from the first groove, and the coupling effect of the coupler is guaranteed.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a coupler according to the present application;

FIG. 2 is a schematic structural diagram of another embodiment of a coupler according to the present application;

FIG. 3 is a schematic view of the structure of the metal cover of FIG. 2;

FIG. 4 is a schematic block diagram of an embodiment of a communication device of the present application;

FIG. 5 is a graph of directivity versus operating frequency for a prior art coupler;

fig. 6 is a graph of directivity of the coupler of the present application as a function of operating frequency.

Detailed Description

In order to make the technical solutions of the present application better understood by those skilled in the art, the coupler and the communication device provided in the present invention are described in further detail below with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a coupler according to the present application. The coupler 10 includes a PCB board 11 and a coupling tab 12. The PCB 11 includes a first metal layer 111, a first dielectric layer 112, a second metal layer 113, a second dielectric layer 114, a third metal layer 115, and a first groove 116. The coupling tab 12 is disposed on a first surface (not shown) of the PCB 11, and the first recess 116 is disposed on a second surface (not shown) of the PCB 11.

As shown in fig. 1, coupling tab 12 is disposed on a first surface of first dielectric layer 112 such that coupling tab 12 is attached to first dielectric layer 112. A first metal layer 111 is deposited on the first surface of the first dielectric layer 112, wherein the first metal layer 111 is a metal ground layer of the coupler 10. A second metal layer 113 is disposed on a second surface of the first dielectric layer 112, a second dielectric layer 114 is disposed on the second metal layer 113, and a third metal layer 115 is disposed on a surface of the second dielectric layer 114 remote from the first dielectric layer 112.

The surface of the third metal layer 115 on the side away from the second dielectric layer 114 is further provided with a load port 15 and a coupling port 16 of the coupler 10, and the load port 15 and the coupling port 16 are connected with the coupling sheet 12 through conducting wires. The coupling port 16 is connected to the next-stage detecting device, and is configured to output a coupling signal obtained by coupling the main circuit radio frequency signal with a certain degree of coupling to the next-stage detecting device. Load port 15 is connected to a plurality of loads to adjust the output impedance of coupler 10. Alternatively, load port 15 may be connected to a single or multiple output resistors depending on the output impedance requirements of coupler 10. The present embodiment can also realize the adjustment of the directivity of the coupling signal by adjusting the output impedance of the load.

The first groove 116 is disposed on the second metal layer 113, the second dielectric layer 114, and the third metal layer 115. The projection of the first groove 116 on the first metal layer 111 coincides with the projection of the coupling tab 12 on the first metal layer 111. By arranging the first groove 116 on the second metal layer 113, the second dielectric layer 114 and the third metal layer 115, the dielectric constant of the coupling sheet 12 on one side of the second dielectric layer 114 is reduced, so that the difference between the dielectric constants on the two sides of the coupling sheet 12 is reduced, and the directivity of the coupler 10 is improved.

Referring further to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of the coupler of the present application. The coupler 10 further includes a metal cover 13 and a plurality of screws 14, the metal cover 13 is disposed on the first groove 116, and the screws 14 are disposed on the metal cover 13.

The projection of the metal cap 13 on the first metal layer 111 covers the projection of the first groove 116 on the first metal layer 111, so that the first groove 116 is completely shielded by the metal cap 13, the coupling signal is prevented from overflowing from the first groove 116, and the coupling effect of the coupler 10 is ensured.

In the prior art, an adjustable coupling mechanism penetrating through a PCB is additionally arranged in a coupler to adjust an electric field of a coupling window, that is, the electric field between a coupling piece and a main rod is changed, thereby improving the directivity of the coupler. Since the electric field between the coupling piece and the main rod is changed, the radio frequency signal passing through the main rod may cause the change of parameters such as insertion loss or return loss. The screw 14 of the present embodiment moves in the first groove 116, and the electric field of the coupler 10 itself is adjusted by adjusting the distance from the screw 14 to the first dielectric layer 112, so as to reduce the influence on the rf signal of the main rod.

Referring further to fig. 3 in conjunction with fig. 1-2, fig. 3 is a schematic diagram of the metal lid of fig. 2. The metal cover 13 includes a plurality of screw holes 131 and a second groove 132.

The plurality of threaded holes 131 are used in cooperation with the plurality of threaded rods 14. Optionally, a first thread is disposed inside the threaded hole 131, and a second thread matching the first thread is disposed outside the screw 14, so that the screw 14 is installed in the threaded hole 131. The screw 14 is movable in the first groove 116 in the axial direction of the threaded hole 131. Alternatively, the number of the threaded rods 14 and the threaded holes 131 can be set according to actual requirements.

In order to further improve the directivity of the coupler, the prior art is realized by increasing the thickness of the PCB, i.e. the dielectric of the PCB, which results in the dielectric constant of the PCB and increases the production cost. The second groove 132 of the present embodiment is disposed on a surface of the metal cover 13 close to the coupling piece 12, so that the distance from the metal cover 13 to the coupling piece 12 is increased, and through the local height, the PCB 11 does not need to be thickened, and meanwhile, the directionality of the coupler 10 can be improved only by changing the metal cover 13, thereby reducing the production cost and facilitating the operation.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device 1 comprises the coupler 10, the housing 20 and the main lever 30 as described above. The housing 20 includes a cylindrical sidewall 22, a hollow interior 23 formed by the cylindrical sidewall 22, and a coupling window 21 opened on the cylindrical sidewall 22. The housing 20 is a metallic material. Alternatively, the housing 20 may be other conductive materials. The coupler 10 is disposed in the coupling window 21, and the main rod 30 is disposed in the hollow inner cavity 23. The main lever 30 and the coupling piece 12 are not in contact with the housing 20.

The main rod 30 is a carrier of the main circuit and is used for transmitting radio frequency signals. The coupler 10 is coupled to the main rod 30 through the coupling window 21, couples the rf signal of the main circuit to the coupler 10 with a certain degree of coupling, and outputs the coupled signal to the next stage of detecting device through the coupler 10, so as to observe or test the coupled signal. Optionally, the coupler 10 is provided with a coupling piece 12 on the side of the main lever 30. The hollow interior 23 is filled with air and forms a specific impedance with the primary shaft 30. Optionally, the hollow interior 23 may be filled with other insulating materials to provide support for the primary shaft 30.

The coupling piece 12 and the stem 30 have various forms, and alternatively, the cross section of the coupling piece 12 may have one or more combinations of a polygon, a circle, and an ellipse, and the cross section of the stem 30 may have one or more combinations of a polygon, a circle, and an ellipse.

Referring to fig. 5 and 6, fig. 5 is a graph showing the directivity of a communication device according to the prior art as a function of the operating frequency, and fig. 6 is a graph showing the directivity of a communication device according to the present invention as a function of the operating frequency. As can be seen from fig. 6, the operating frequency band of the communication device 1 of the present application is 3.36-3.66 GHz. Taking the example of working at 3.36-3.66GHz, the directionality of the communication device 1 of the present application and the communication device of the prior art is analyzed.

As shown in fig. 5, the maximum value of the directivity of the prior art communication device is 3.66GHz at a frequency where the directivity is-27 dB, which is point a. As shown in fig. 6, the maximum value of the directivity of the communication device 1 of the present application is 3.66GHz, and the directivity is-39.3 dB, that is, point B. Comparing point a with point B, the directivity of the communication device 1 of the present application is 10dB smaller than the directivity of the communication device of the prior art, and the directivity of the communication device 1 can be effectively improved.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. The coupler is characterized by comprising a PCB, a coupling piece and a metal cover, wherein the coupling piece is arranged on a first surface of the PCB, a first groove is formed in a second surface of the PCB, the projection of the coupling piece on the PCB is overlapped with the first groove, and the metal cover is arranged on the first groove.

2. The coupler of claim 1, wherein the PCB board comprises:

the coupling sheet is arranged on a first surface of the first medium layer;

the first metal layer is laid on the first surface of the first dielectric layer;

the second metal layer is laid on the second surface of the first dielectric layer;

the second dielectric layer is arranged on the second metal layer;

the third metal layer is laid on the surface of the second dielectric layer, which is far away from the first dielectric layer;

the second metal layer, the second dielectric layer and the third metal layer are provided with the first groove.

3. The coupler of claim 2, further comprising a plurality of threaded rods, wherein the metal cover is provided with a plurality of threaded holes, and wherein the threaded rods are mounted within the threaded holes.

4. The coupler of claim 3, wherein a surface of the metal cover adjacent to the coupling tab is provided with a second groove.

5. The communication equipment is characterized by comprising a coupler, a main rod and a shell, wherein the main rod is arranged in the shell, a coupling window is formed in the shell and used for containing the coupler, and the coupler is coupled with the main rod.

6. The communication device according to claim 5, wherein the coupler comprises a PCB board, a coupling sheet and a metal cover, the coupling sheet is disposed on the PCB board, the PCB board is provided with a first groove, the metal cover is disposed on the first groove and used for covering the first groove, and a projection of the metal cover on the PCB board is overlapped with a projection of the coupling sheet on the PCB board; and a second groove is formed in one surface, close to the coupling sheet, of the metal cover.

7. The communication device of claim 6, wherein the PCB board comprises:

the first medium layer is provided with a first surface and a second surface which are oppositely arranged, and the coupling sheet is arranged on the first surface of the first medium layer;

the second dielectric layer is arranged on the second metal layer;

8. The communication device of claim 7, wherein the coupler further comprises a plurality of threaded rods, and wherein the metal cover is provided with a plurality of threaded holes, and wherein the threaded rods are mounted within the threaded holes.

9. The communication device of claim 8, wherein the housing comprises a cylindrical sidewall and a hollow interior formed by the cylindrical sidewall, the hollow interior configured to receive the stem; wherein, the casing is the metal casing.

10. The communication device of claim 9, wherein the operating frequency band of the communication device is: 3.36-3.66 GHz.