CN219874007U - Coupler and radio frequency front end module - Google Patents

Abstract

The utility model provides a coupler and a radio frequency front end module, wherein the coupler comprises: the main circuit, the coupling circuit and the isolation circuit are arranged in the metal layer; the isolation circuit is arranged between at least part of the main circuit and at least part of the coupling circuit in the projection direction perpendicular to the metal layer; the isolated circuit includes at least one ground node through which the isolated circuit is grounded. According to the utility model, the isolation circuit between at least part of the main circuit and at least part of the coupling circuit is arranged in the projection direction perpendicular to the metal layer, and comprises at least one grounding node for being connected with the ground, so that the isolation degree of the coupler can be improved, and the directivity coefficient of the coupler is improved.

Description

Coupler and radio frequency front end module

Technical Field

The utility model relates to the technical field of couplers, in particular to a coupler and a radio frequency front end module.

Background

The coupler is a passive device commonly used in communication systems, is widely applied to radio frequency and microwave circuits and communication systems, and can be used for separating and synthesizing signals.

The coupler comprises performance indexes such as working frequency band, insertion loss, coupling degree, directivity coefficient, isolation degree and the like. However, the directivity coefficient index of the coupler in the related art is poor, and it is difficult to meet the use requirement.

Disclosure of Invention

In view of the above, the present utility model provides a coupler and a radio frequency front end module for improving the above-mentioned problems.

In a first aspect, an embodiment of the present utility model provides a coupler, including: the main circuit, the coupling circuit and the isolation circuit are arranged in the metal layer; the isolation circuit is arranged between at least part of the main circuit and at least part of the coupling circuit in the projection direction perpendicular to the metal layer; the isolated circuit includes at least one ground node through which the isolated circuit is grounded.

Optionally, the isolation circuit, the main circuit and the coupling circuit are respectively arranged in different metal layers; or the isolation circuit and the main circuit are respectively arranged in different metal layers, and the main circuit and the coupling circuit are arranged in the same metal layer; or the isolation circuit and the main circuit are respectively arranged in different metal layers, and the isolation circuit and the coupling circuit are arranged in the same metal layer.

Optionally, the isolation line and the main line are disposed in the same metal layer; the isolation circuit and the coupling circuit are arranged in the same metal layer, or the isolation circuit and the coupling circuit are respectively arranged in different metal layers.

Optionally, in a projection direction perpendicular to the metal layer, a minimum pitch between the isolation line and the main line is in a range of [20 μm,60 μm ].

Optionally, the isolated line includes a plurality of ground nodes.

Optionally, the main circuit includes a signal input port, a signal output port, and a signal connection line connected between the signal input port and the signal output port; the coupling line comprises a signal isolation port, a signal coupling port and a signal coupling line connected between the signal isolation port and the signal coupling port; the isolation line is arranged between at least part of the signal connecting lines and at least part of the signal coupling lines.

Optionally, in a projection direction perpendicular to the metal layer, a distance between the isolation line and the main line is 1-2 times a line width of the main line.

Optionally, the isolation line is a metal line, and a line width of the metal line is in a range of [10 μm,40 μm ].

Alternatively, the line width of the metal line is in the range of [20 μm,30 μm ].

Optionally, the main line comprises a first sub-main line, and the coupling line comprises a first sub-coupling line; the isolation circuit is arranged between the first sub-main circuit and the first sub-coupling circuit in a projection direction perpendicular to the metal layer.

Optionally, the main line further comprises a second sub-main line, and the coupling line further comprises a second sub-coupling line; the second sub-main circuit and the second sub-coupling circuit are arranged between the first sub-main circuit and the first sub-coupling circuit in the projection direction perpendicular to the metal layer; and the isolation line surrounds the second sub-main line and the second sub-coupling line in a projection direction perpendicular to the metal layer.

Optionally, the isolation line includes a first sub isolation line and a second sub isolation line, and the first sub isolation line and the second sub isolation line are connected in a projection direction perpendicular to the metal layer to form a closed region so as to surround the second sub main line and the second sub coupling line through the closed region.

In a second aspect, an embodiment of the present utility model further provides a radio frequency front end module, including a coupler as in the first aspect.

The utility model provides a coupler and a radio frequency front end module, wherein the coupler comprises: the main circuit, the coupling circuit and the isolation circuit are arranged in the metal layer; the isolation circuit is arranged between at least part of the main circuit and at least part of the coupling circuit in the projection direction perpendicular to the metal layer; the isolated circuit includes at least one ground node through which the isolated circuit is grounded. According to the utility model, the isolation circuit between at least part of the main circuit and at least part of the coupling circuit is arranged in the projection direction perpendicular to the metal layer, and comprises at least one grounding node for being connected with the ground, so that the isolation degree of the coupler can be improved, and the directivity coefficient of the coupler is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required for the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, not all embodiments. All other embodiments and figures obtained by a person skilled in the art without any inventive effort are within the scope of protection of the present utility model based on the embodiments of the present utility model.

Fig. 1 is a schematic structural diagram of a coupler according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of an isolated circuit according to an embodiment of the present utility model.

Fig. 3 is a schematic projection view of each of the lines in fig. 2.

Fig. 4 is a schematic view of a projection plane according to an embodiment of the present utility model.

FIG. 5 is a schematic diagram of the isolation simulation results of the embodiment of FIG. 4.

FIG. 6 is a schematic diagram of the directivity coefficient simulation result of the embodiment of FIG. 4.

Fig. 7 is a schematic structural diagram of a radio frequency front end module according to an embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The coupler typically includes a main line, which typically includes a signal input port and a signal output port, and a coupling line, which typically includes a signal isolation port and a signal coupling port.

Isolation may be used to describe the relationship of a signal input port of a main line to a signal isolation port of a coupling line or to describe the relationship of a signal output port of a main line to a signal coupling port of a coupling line. Under ideal conditions, when the coupler is in a working state, the signal isolation port has no signal output, and the isolation degree of the coupler is infinite.

Further, the directivity coefficient of the coupler is used to describe the relationship between the signal coupling port and the signal isolation port of the coupling line, and the directivity coefficient=isolation degree-coupling degree, so that the isolation degree is positively correlated with the directivity coefficient under the condition that the coupling degree is unchanged, but the directivity coefficient index of the coupler in the related art is poor, and it is difficult to meet the use requirement.

In order to improve the above problems, the present inventors propose a coupler and a radio frequency front end module provided by the present utility model, the coupler comprising: the main circuit, the coupling circuit and the isolation circuit are arranged in the metal layer; the isolation circuit is arranged between at least part of the main circuit and at least part of the coupling circuit in the projection direction perpendicular to the metal layer; the isolated circuit includes at least one ground node through which the isolated circuit is grounded. According to the utility model, the isolation circuit between at least part of the main circuit and at least part of the coupling circuit is arranged in the projection direction perpendicular to the metal layer, and comprises at least one grounding node for being connected with the ground, so that the isolation degree of the coupler can be improved, and the directivity coefficient of the coupler is improved.

The coupler provided by the embodiment of the utility model will be described in detail through specific embodiments.

In some implementations, the coupler provided by the embodiment of the utility model includes: the main circuit, the coupling circuit and the isolation circuit are arranged in the metal layer; wherein,,

the isolation circuit is arranged between at least part of the main circuit and at least part of the coupling circuit in a projection direction perpendicular to the metal layer.

The isolated circuit includes at least one ground node through which the isolated circuit is grounded.

In some embodiments, the rf front-end module of the present utility model includes at least two metal layers, and the metal layers are parallel to each other.

In some embodiments, the main line is disposed on a metal layer of the chip or the substrate, and the coupling line is disposed on a metal layer of the chip or the substrate, i.e., the metal layer may be a metal layer on the chip or a metal layer on the substrate.

In some embodiments, the isolated circuit includes at least one ground node to provide a ground loop to the signal to increase the isolation of the coupler and thereby increase the directivity coefficient of the coupler.

Optionally, the isolated circuit includes a plurality of grounding nodes, wherein the larger the number of the grounding nodes is, the smaller parasitic effect brought by the isolated circuit is, and the better the isolation degree improving effect is.

Optionally, the isolated circuit may be connected to the ground metal layer by punching, so as to ground the isolated circuit and provide a signal to the ground loop, where the via is a metal via.

In some embodiments, the isolated circuit is a metal wire, and the line width of the isolated circuit affects the effect of the isolated circuit on the isolation degree, in an ideal case, the line width of the isolated circuit is proportional to the isolation effect of the isolated circuit, so that the line width of the isolated circuit can be increased as much as possible, but in order to make the wiring in the metal layer reasonable, the line width of the isolated circuit can be set according to the space condition of the metal layer.

Optionally, the line width of the isolated line is in the range of [10 μm,40 μm ].

Preferably, the line width of the isolation line is in the range of [20 μm,30 μm ].

In some embodiments, the main circuit includes a signal input port, a signal output port, and a signal connection line connected before the signal input port and the signal output port; the coupling line comprises a signal isolation port, a signal coupling port and a signal coupling line connected between the signal isolation port and the signal coupling port; the isolation line is arranged between at least part of the signal connecting lines and at least part of the signal coupling lines.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a coupler according to an embodiment of the utility model. As shown in fig. 1, the coupler 100 in fig. 1 includes a main line 110 and a coupling line 120.

In some embodiments, the main line 110 includes a signal input port P1, a signal output port P2, and a signal connection line L1 connected between the signal input port P1 and the signal output port P2.

In some embodiments, the coupling line 120 includes a signal isolation port P3, a signal coupling port P4, and a signal coupling line L2 connected between the signal isolation port P3 and the signal coupling port P4.

In some embodiments, the coupler 100 further includes an isolation line 130 disposed between the signal connection line L1 and the signal coupling line L2, and the isolation line 130 includes at least one ground node to ground the isolation line 130.

In a further example, please refer to fig. 2 and 3, fig. 2 is a schematic diagram of an isolated circuit arrangement provided in an embodiment of the present utility model, and fig. 3 is a schematic diagram of a projection of each circuit in fig. 2.

As shown in fig. 2, fig. 2 includes a first metal layer 10, a second metal layer 20, a third metal layer 30, and a coupler including a main line 110, a coupling line 120, and an isolation line 130.

Specifically, in fig. 2, the main circuit 110 is disposed in the first metal layer 10, the isolation circuit 130 is disposed in the second metal layer 20, the coupling circuit 120 is disposed in the third metal layer 30, and the isolation circuit 130 further includes a ground node 131.

As shown in fig. 3, in a projection direction perpendicular to the metal layer, the main line 110, the coupling line 120, and the isolation line 130 are defined to be projected to the projection plane in fig. 3.

In the projection plane, the isolation line 130 is located between the main line 110 and the coupling line 120, and the isolation line 130 can improve the isolation of the coupler, thereby improving the directivity coefficient of the coupler.

Further, in order to improve the isolation effect of the isolated circuit 130, more ground nodes may be disposed in the isolated circuit 130 and/or the line width of the isolated circuit 130 may be increased, and the description of the above parts of the specification will not be repeated here.

It is to be understood that, in fig. 2, the isolation line, the main line and the coupling line are respectively disposed in different metal layers, but the present utility model is not limited thereto, and the respective lines may be disposed in different metal layers, and the main line and the coupling line are disposed in the same metal layer; or the isolation circuit and the main circuit are respectively arranged in different metal layers, and the isolation circuit and the coupling circuit are arranged in the same metal layer.

Specifically, in the above arrangement, the isolated circuit and the main circuit are disposed in different metal layers, and the reason is that when the main circuit and the isolated circuit are disposed in the same metal layer, if the distance between the main circuit and the isolated circuit is too short, the isolated circuit will affect the performance of the main circuit.

Further, the above arrangement includes an arrangement in which the isolation line, the main line, and the coupling line are respectively disposed in different metal layers, but in this arrangement, the shielding effect of the isolation line is weak, and the effect of improving the isolation degree of the coupler is small, so that it is preferable to dispose the isolation line and the main line or the coupling line in the same metal layer.

In some embodiments, each line is disposed in such a way that the isolated line and the main line are disposed in the same metal layer; the isolation circuit and the coupling circuit are arranged in the same metal layer, or the isolation circuit and the coupling circuit are respectively arranged in different metal layers.

When the isolated circuit and the main circuit are disposed in the same metal layer, the isolated circuit may affect the performance of the main circuit if the main circuit is too close to the isolated circuit, as described in the above section of the specification.

Thus, in some embodiments, the isolation line and the main line may be disposed in the same metal layer, but in order to avoid that the isolation line affects the performance of the main line, the distance between the isolation line and the main line is 1-2 times the line width of the main line in the projection direction perpendicular to the metal layer.

Therefore, when the isolation line and the main line are provided in the same metal layer, the specific value of the distance between the isolation line and the main line needs to be determined according to the line width of the main line, and when the wiring in the metal layer cannot satisfy the requirement that the distance between the isolation line and the main line is 1 to 2 times the line width of the main line, it may be preferable to provide the isolation line and the coupling line in the same layer.

In some embodiments, the minimum spacing between the isolated line and the main line is controlled to be in the range of [20 μm,60 μm ] according to the common line width of the main line, so as to reduce the influence of the isolated line on the performance of the main line as much as possible.

In some embodiments, the main line comprises a first sub-main line, and the coupling line comprises a first sub-coupling line; the isolation circuit is arranged between the first sub-main circuit and the first sub-coupling circuit in a projection direction perpendicular to the metal layer.

In particular, when the wiring of the main line and the coupling line is complicated, the isolated line inevitably crosses the main line and/or the coupling line in a projection direction perpendicular to the metal layer, i.e., a projection plane, and thus is located only between the first sub-main line (part of the main line) and the first sub-coupling line (part of the coupling line).

In some embodiments, the main line further comprises a second sub-main line, and the coupling line further comprises a second sub-coupling line; the second sub-main circuit and the second sub-coupling circuit are arranged between the first sub-main circuit and the first sub-coupling circuit in the projection direction perpendicular to the metal layer; and the isolation line surrounds the second sub-main line and the second sub-coupling line in a projection direction perpendicular to the metal layer.

Specifically, having the isolated line surround the second sub-main line and the second sub-coupling line can improve the isolation effect of the isolated line.

In some embodiments, the isolated line may include a plurality of sub-isolated lines.

In some embodiments, the sub-isolation lines may be disposed in different metal layers, for example, a first sub-isolation line is disposed in a first metal layer, and a second sub-isolation line is disposed in a second metal layer, so as to fully utilize layout space in the metal layers.

In some embodiments, each sub-isolated line includes at least one ground node.

The setting mode of any one sub-isolation line in the plurality of sub-isolation lines can be one of the following setting modes:

for example, the sub-isolation circuit, the main circuit and the coupling circuit are respectively arranged in different metal layers; for another example, the sub-isolated circuit and the main circuit are respectively arranged in different metal layers, and the main circuit and the coupling circuit are arranged in the same metal layer; for example, the sub-isolation circuit and the main circuit are respectively arranged in different metal layers, and the isolation circuit and the coupling circuit are arranged in the same metal layer; the sub-isolated circuit and the main circuit may be disposed in the same metal layer, and the sub-isolated circuit and the coupling circuit may be disposed in the same metal layer, or the isolated circuit and the coupling circuit may be disposed in different metal layers, respectively.

Specifically, the setting manner, the line width range of the sub-isolation line and the minimum distance from the main line when the sub-isolation line and the main line are set on the same metal layer may refer to the requirement of the above embodiment on the isolation line, and will not be described herein.

In some embodiments, the isolation line includes a first sub-isolation line and a second sub-isolation line, which are connected in a projection direction perpendicular to the metal layer to form a closed region to surround the second sub-main line and the second sub-coupling line through the closed region.

As an example, referring to fig. 4 again, fig. 4 is a schematic view of a projection plane according to an embodiment of the utility model. As shown in fig. 4, the projection plane in fig. 4 includes a main line 210, a coupling line 220, and an isolation line 230, wherein the line is a solid line representing the line being disposed in the first metal layer, and the line is a dotted line representing the line being disposed in the second metal layer, and the ground node in the isolation line 230 is not shown in fig. 4.

In some embodiments, the main line 210 includes a first sub-main line 211 and a second sub-main line 212, the coupling line 220 includes a first sub-coupling line 221 and a second sub-coupling line 222, and the isolation line 230 includes a first sub-isolation line 231 and a second sub-isolation line 232.

In some embodiments, the first sub-main line 211 may be provided in any shape as needed, and illustratively, the first sub-main line 211 is in a straight line form, and the second sub-main line 212 is connected to any one node on the first sub-main line 211.

The second sub-main line 212 may be provided in an arbitrary shape as needed, and the second sub-main line 212 may include three portions, for example: the first end of the first part is connected with any node on the first sub-main line 211, and the second end of the first part extends horizontally leftwards; the first end of the second part is connected with the second end of the first part, and the second end of the second part extends along the vertical downward direction; the first end of the third portion is connected to the second end of the second portion, and the second end of the third portion extends in a horizontal rightward direction.

Optionally, the end of the third portion of the second sub-main line 212 is approximately circular or octagonal or other shaped.

Alternatively, the second end of the third portion of the second sub-main line 212 is not in contact with the first sub-main line 211 when it extends in the horizontal right direction.

Alternatively, the main line 210 may further include other sub-main lines, and the other sub-main lines may be connected to the ends or portions of the first sub-main line 211 and the second sub-main line 212, which is not limited by the present utility model.

In some embodiments, the connection dotted line between the first sub-coupling line 221 and the second sub-coupling line 222 is a switching unit for connecting the first sub-coupling line 221 with the upper or lower end of the second sub-coupling line 222 to change the signal flow direction in the second sub-coupling line 222.

In some embodiments, the shape of the first sub-coupling line 221 may be set as desired, and the first sub-coupling line 221 may include four portions, for example: the first end of the first portion is connected to the switching unit such that the first end of the first portion is connected to the upper end or the lower end of the second sub-coupling line 222, and the second end of the first portion extends horizontally in the left direction; the first end of the second part is connected with the second end of the first part, and the second end of the second part extends in a vertical downward direction; the third part is approximately round or octagonal or has other special-shaped shapes, a first part of the third part is connected with a second end of the second part, and a second part of the third part is connected with a first end of the fourth part; the first end of the fourth portion is connected to the second portion of the fourth portion, and the second end of the fourth portion extends in a vertically downward direction.

Optionally, the first part of the third portion is located above and to the left of the third portion and the second part of the third portion is located below and to the right of the third portion.

In some embodiments, the shape of the second sub-coupling line 222 may be set as desired, and the second sub-coupling line 222 may include ten portions, for example: the first end of the first portion is the upper end of the second sub-coupling line 222, and the second end of the second portion extends in the horizontal right direction; the first end of the second part is connected with the second end of the first part, and the second end of the second part extends in a vertical downward direction; the first end of the third part is connected with the second end of the second part, and the second end of the third part extends to the right direction horizontally; the first end of the fourth part is connected with the second end of the third part, and the second end of the fourth part extends in the vertical downward direction; the fifth part is in a hollow square or other special-shaped shape, and a first part of the fifth part is respectively connected with a second end of the fourth part and a first end of the sixth part; the first end of the sixth part is connected to the first part of the fifth part, and the second end of the sixth part extends horizontally and rightwards; the first end of the seventh part is connected with the second end of the sixth part, and the second end of the seventh part extends in a vertical downward direction; the first end of the eighth part is connected with the second end of the seventh part, and the second end of the eighth part extends horizontally and leftwards; the first end of the ninth part is connected with the second end of the eighth part, and the second end of the ninth part extends to the vertical upward direction; the first end of the tenth portion is connected to the second end of the ninth portion, the second end of the tenth portion extends horizontally to the left, and the second end of the tenth portion is a lower end of the second sub-coupling line 222.

Optionally, the second end of the fourth portion of the second sub-coupling line 222 passes through the first portion of the second sub-main line 212 in the projection plane while extending in a vertically downward direction.

Optionally, the second end of the seventh portion of the second sub-coupling line 222 passes the end of the third portion of the second sub-main line 212 in the projection plane while extending in a vertically downward direction.

Optionally, the coupling line 220 may further include other sub-coupling lines, which may be connected to the ends or portions of the first sub-coupling line 221 and the second sub-coupling line 222, which is not limited by the present utility model.

In some embodiments, the coupling line 220 includes both a dashed line and a solid line, i.e., the coupling line 220 is located partially in the first metal layer and partially in the second metal layer.

The present utility model is therefore not limited in that the coupling lines must all be disposed in one metal layer and the main lines must all be disposed in one metal layer, and in some embodiments the coupling lines are disposed in multiple metal layers and/or the main lines are disposed in multiple metal layers.

In fig. 4, the first sub-isolated line 231 and the second sub-isolated line 232 constitute a closed region so as to surround the second sub-main line 212 and the second sub-coupling line 222 through the closed region.

It will be appreciated that the second sub-coupling line 222 still has a small portion of the line outside the closed area, but the portion of the line is relatively small, which may be considered as the closed area already surrounding the second sub-coupling line 222, or the coupling line 220 may be subdivided, and a small portion of the line outside the closed area may be subdivided into the first sub-coupling line 221.

Further, in fig. 4, the first sub-isolation line 231 and the main line 210 are both solid lines, so that the first sub-isolation line 231 and the main line 210 are located in the same metal layer, and therefore, the first sub-isolation line 231 and the main line 210 do not intersect in the projection plane, and the minimum distance between the first sub-isolation line 231 and the main line 210 is within a predetermined range, so as to avoid the first sub-isolation line 231 from affecting the performance of the main line 210.

In some embodiments, the shape of the first sub-isolation line 231 may be set as desired, and the first sub-isolation line 231 may include five portions, for example: the first portion extends from a head end to a tail end in a vertically downward direction; the first end of the second part is connected with the tail end of the first part, and the second end of the second part extends horizontally and leftwards; the first end of the third part is connected with the second end of the second part, and the second end of the third part extends in a vertical downward direction; the first end of the fourth part is connected with the second end of the third part, and the second end of the fourth part extends to the right direction; the first end of the fifth portion is connected to the second end of the fourth portion, and the second end of the fifth portion extends in a vertically downward direction.

Optionally, the ninth portion of the second sub-coupling line 222 is located between the third portion of the first sub-isolation line 231 and the second portion of the second sub-main line 212.

Optionally, the second end of the second portion of the first sub-isolation line 231 passes through the second portion of the second sub-coupling line 222 while extending in the horizontal left direction; the second end of the third portion of the first sub-isolation line extends in a vertically downward direction past the tenth portion of the second sub-coupling line 222.

Optionally, the first sub-isolation line 231 is located at the same metal layer as the main line 210, so that the first sub-isolation line 231 is kept at a certain distance from the main line 210, so as to avoid that the first sub-isolation line 231 is too close to the main line 210, which affects the performance of the main line 210.

In some embodiments, the shape of the second sub-isolated line 232 may be set as desired, and the second sub-isolated line 232 may illustratively include three portions: the first end of the first portion is connected to the first portion of the first sub-isolation line 231 in the projection plane, and the second end of the first portion of the second sub-isolation line 232 extends in the horizontal right direction; the first end of the second part is connected with the second end of the first part, and the second end of the second part extends in a vertical downward direction; the first end of the third portion is connected to the second end of the second portion, and the second end of the third portion extends horizontally to the left.

Alternatively, the second end of the first portion of the second sub-insulation line 232 does not contact the first sub-main line 211 when extending in the horizontal right direction.

Optionally, the second end of the second portion of the second sub-isolation line 232 passes through the first portion of the second sub-main line 212 when extending in a vertically downward direction.

Optionally, the second end of the third portion of the second sub-isolation line 232 extends to the third portion of the first sub-isolation line 231 in a horizontal left direction.

Optionally, the eighth portion of the second sub-coupling line 222 is located between the third portion of the second sub-main line 212 and the third portion of the second sub-isolation line 232.

Referring to fig. 5 and 6, fig. 5 is a schematic diagram of isolation simulation results of the embodiment in fig. 4, and fig. 6 is a schematic diagram of directivity coefficient simulation results of the embodiment in fig. 4.

As shown in fig. 5, the abscissa in fig. 5 is the operating frequency of the coupler, the unit is GHz, the ordinate in fig. 5 is the isolation of the coupler, the unit is dB, and after the isolation line is added in the embodiment of fig. 4, the isolation of the coupler is reduced, but the absolute value of the isolation is increased, and the isolation effect is improved.

As shown in fig. 6, the abscissa in fig. 6 is the operating frequency of the coupler, the unit is GHz, the ordinate in fig. 6 is the directivity coefficient of the coupler, the directivity coefficient of the coupler increases after the isolation line is added in the embodiment in fig. 4, and the directivity coefficient index of the coupler is optimized.

In some embodiments, the directivity coefficient = absolute value of isolation-coupling.

The utility model provides a coupler and a radio frequency front end module, wherein the coupler comprises: the main circuit, the coupling circuit and the isolation circuit are arranged in the metal layer; the isolation circuit is arranged between at least part of the main circuit and at least part of the coupling circuit in the projection direction perpendicular to the metal layer; the isolated circuit includes at least one ground node through which the isolated circuit is grounded. According to the utility model, the isolation circuit between at least part of the main circuit and at least part of the coupling circuit is arranged in the projection direction perpendicular to the metal layer, and comprises at least one grounding node for being connected with the ground, so that the isolation degree of the coupler can be improved, and the directivity coefficient of the coupler is improved.

Referring to fig. 7 again, fig. 7 is a schematic structural diagram of a radio frequency front end module according to an embodiment of the utility model. As shown in fig. 7, the rf front-end module 300 includes the coupler described above.

In some embodiments, the rf front-end module 300 further comprises a metal layer; the main line, the coupling line and the isolation line of the coupler are arranged in the metal layer.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the utility model, the steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as above, which are not provided in details for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (13)

1. A coupler, the coupler comprising: the device comprises a main circuit, a coupling circuit and an isolation circuit, wherein the main circuit, the coupling circuit and the isolation circuit are arranged in a metal layer; wherein,,

the isolation circuit is arranged between at least part of the main circuit and at least part of the coupling circuit in a projection direction perpendicular to the metal layer;

the isolated circuit includes at least one ground node through which the isolated circuit is grounded.

2. The coupler of claim 1, wherein the coupler comprises a plurality of coupling elements,

the isolation circuit, the main circuit and the coupling circuit are respectively arranged in different metal layers; or,

the isolation circuit and the main circuit are respectively arranged in different metal layers, and the main circuit and the coupling circuit are arranged in the same metal layer; or,

the isolation circuit and the main circuit are respectively arranged in different metal layers, and the isolation circuit and the coupling circuit are arranged in the same metal layer.

3. The coupler of claim 1, wherein the coupler comprises a plurality of coupling elements,

the isolation circuit and the main circuit are arranged in the same metal layer;

the isolation circuit and the coupling circuit are arranged in the same metal layer, or the isolation circuit and the coupling circuit are respectively arranged in different metal layers.

4. A coupler according to claim 3, characterized in that the spacing between the isolated line and the main line is 1-2 times the line width of the main line in a projection direction perpendicular to the metal layer.

5. The coupler according to claim 4, wherein a minimum distance between the isolated line and the main line in a projection direction perpendicular to the metal layer is in a range of [20 μm,60 μm ].

6. The coupler of claim 1, wherein the isolated line comprises a plurality of ground nodes.

7. The coupler of claim 1, wherein the main line includes a signal input port, a signal output port, and a signal connection line connected between the signal input port and the signal output port;

the coupling line comprises a signal isolation port, a signal coupling port and a signal coupling line connected between the signal isolation port and the signal coupling port;

the isolation line is arranged between at least part of the signal connecting lines and at least part of the signal coupling lines.

8. The coupler of claim 1, wherein the isolated line is a metal line and the line width of the isolated line is in the range of [10 μιη,40 μιη ].

9. The coupler of claim 8, wherein the line width of the isolated line is in the range of [20 μιη,30 μιη ].

10. The coupler of claim 1, wherein the main line comprises a first sub-main line, and the coupling line comprises a first sub-coupling line; wherein,,

in the projection direction perpendicular to the metal layer, the isolation circuit is disposed between the first sub-main circuit and the first sub-coupling circuit.

11. The coupler of claim 10, wherein the main line further comprises a second sub-main line, and the coupling line further comprises a second sub-coupling line; wherein,,

the second sub-main line and the second sub-coupling line are arranged between the first sub-main line and the first sub-coupling line in a projection direction perpendicular to the metal layer;

and the isolation line surrounds the second sub-main line and the second sub-coupling line in a projection direction perpendicular to the metal layer.

12. The coupler of claim 11, wherein the isolated line includes a first sub-isolated line and a second sub-isolated line, the first sub-isolated line and the second sub-isolated line being connected in a projection direction perpendicular to the metal layer to form a closed region to surround the second sub-main line and the second sub-coupling line through the closed region.

13. A radio frequency front end module comprising a coupler as claimed in any one of claims 1 to 12.