CN216451347U - Coupler and coupling circuit, communication equipment thereof - Google Patents

Abstract

The application is suitable for the technical field of communication, and provides a coupler and a coupling circuit and communication equipment thereof, wherein the coupling circuit comprises: the n coupling lines are coupled with the main transmission line of the coupler, and different coupling lines are used for coupling radio-frequency signals in different frequency bands from the main transmission line; the input end of each filtering unit is connected with the first end of one coupling line and is used for filtering the radio-frequency signals at the first ends of the coupling lines connected with the filtering units so as to filter out the radio-frequency signals with the frequencies not within the target frequency band and output the radio-frequency signals after filtering; the n input ends of the coupling degree adjusting unit are respectively connected with the output ends of the n filtering units, and the output ends of the coupling degree adjusting unit are connected with the coupling end of the coupler; the power regulating unit is used for regulating the power of the radio frequency signals output by the n filtering units and outputting a radio frequency signal with a power value meeting the preset requirement through the output end; n is an integer greater than 1, so that the coupler has good directivity in each frequency band.

Description

Coupler and coupling circuit, communication equipment thereof

Technical Field

The application belongs to the technical field of communication, and particularly relates to a coupler, a coupling circuit of the coupler and communication equipment of the coupler.

Background

A coupler is a directional power coupling element, which can be used for signal isolation, separation, mixing, etc., and is widely used in various communication systems as an important component of microwave/rf circuits. In order to adapt to the situation that the frequency bands of radio frequency signals in different communication systems are different, the existing coupler tends to multi-frequency integration more and more, that is, the existing coupler can be applied to a plurality of different frequency bands to realize the processing of isolation, separation or mixing and the like of the radio frequency signals in the plurality of different frequency bands.

However, the existing multi-frequency integrated coupler has poor directivity in each frequency band.

SUMMERY OF THE UTILITY MODEL

In view of this, embodiments of the present application provide a coupler, a coupling circuit thereof, and a communication device, so as to solve the technical problem that the existing multi-frequency integrated coupler has poor directivity in each frequency band.

In a first aspect, an embodiment of the present application provides a coupling circuit of a coupler, including:

the n coupling lines are coupled with a main transmission line of the coupler and used for coupling radio-frequency signals from the main transmission line; different coupling lines are used for coupling radio frequency signals in different frequency bands;

the input end of each filtering unit is connected with the first end of one coupling line, and the filtering units are used for filtering the radio-frequency signals at the first ends of the coupling lines connected with the filtering units so as to filter the radio-frequency signals with frequencies not within a target frequency band and output the radio-frequency signals after filtering; the target frequency band is a frequency band of a radio frequency signal which is used for coupling by a coupling line connected with the filtering unit;

the coupling degree adjusting unit is connected with the output ends of the n filtering units respectively at n input ends, and the output end of the coupling degree adjusting unit is connected with the coupling end of the coupler; the coupling degree adjusting unit is used for adjusting the power of the radio-frequency signals output by the n filtering units and outputting a radio-frequency signal with a power value meeting a preset requirement through the output end of the coupling degree adjusting unit; wherein n is an integer greater than 1.

Optionally, the coupling degree adjusting unit includes m combiners, where m is a positive integer; each combiner comprises at least two input ends and an output end, and each input end of the combiner is connected with the output end of one filtering unit or the output end of one other combiner; the combiner is used for combining at least two paths of radio frequency signals received by the input end of the combiner into one path of radio frequency signals and outputting the radio frequency signals obtained by combining through the output end of the combiner; the output end of the combiner which combines the radio-frequency signals output by all the filtering units is connected with the coupling end.

Optionally, the coupling degree adjusting unit further includes n first power attenuation circuits; each of the first power attenuation circuits is connected between an output terminal of one of the filtering units and one input terminal of the combiner.

Optionally, the coupling degree adjusting unit further includes m second power attenuation circuits; each second power attenuation circuit is connected with the output end of one combiner.

Optionally, the coupling degree adjusting unit includes a multiplexer; each input end of the multiplexer is connected with the output end of one filtering unit, and the output end of the multiplexer is used as the output end of the coupling degree adjusting unit; the multiplexer is used for selecting one path of radio frequency signal from the radio frequency signals output by all the filtering units and outputting the selected path of radio frequency signal.

Optionally, the coupling degree adjusting unit further includes n third power attenuation circuits; each of the third power attenuation circuits is connected between an output terminal of one of the filter units and an input terminal of the multiplexer.

Optionally, the coupling degree adjusting unit further includes a fourth power attenuation circuit; the fourth power attenuation circuit is connected between the output end of the multiplexer and the coupling end.

Optionally, the coupling circuit further includes n isolation degree adjusting units; each isolation degree adjusting unit is connected with the second end of one coupling line; the isolation degree adjusting unit is used for adjusting the power of the radio frequency signal at the second end of the coupled line connected with the isolation degree adjusting unit.

In a second aspect, an embodiment of the present application provides a coupler, including an input end, a through end, a coupling end, an isolation end, and a main transmission line connected between the input end and the through end; the coupler further comprises a coupling circuit as described in the first aspect above.

In a third aspect, an embodiment of the present application provides a communication device, including the coupler according to the second aspect.

The coupler, the coupling circuit and the communication equipment provided by the embodiment of the application have the following beneficial effects:

the coupling circuit of coupler that this application embodiment provided, including n coupling lines, different coupling lines are used for coupling the radio frequency signal in the different frequency channels from the main transmission line of coupler, the first end of every coupling line all is connected with a filtering unit, come the filtering frequency not in the radio frequency signal in the frequency channel that the coupling line that is connected with filtering unit corresponds through filtering unit, thereby make the frequency of the radio frequency signal of every filtering unit output all in the frequency channel that corresponds, every filtering unit can restrain the coupling degree and the isolation of coupler outside every frequency channel that corresponds promptly, thereby make the coupler all have good directionality in every frequency channel. In addition, each filtering unit also outputs the filtered radio-frequency signals to the coupling degree adjusting unit, and the coupling degree adjusting unit is used for adjusting the power of the received radio-frequency signals and outputting the radio-frequency signals with the power values meeting the preset requirements, so that the coupling degree of the coupler can meet the preset requirements. In summary, the coupler provided by the embodiment of the present application can be applicable to a plurality of frequency bands, and has good directivity in each frequency band, and the coupling degree when the coupler is applied to different frequency bands can reach the preset requirement by adjusting.

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 embodiments or the prior art descriptions will be briefly described 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 inventive exercise.

Fig. 1 is a schematic structural diagram of a coupling circuit of a coupler according to an embodiment of the present disclosure;

fig. 2a is a schematic structural diagram of a coupling circuit of a coupler according to yet another embodiment of the present application;

fig. 2b is a schematic structural diagram of a coupling circuit of a coupler according to another embodiment of the present application;

fig. 2c is a schematic structural diagram of a coupling circuit of a coupler according to another embodiment of the present application;

fig. 3 is a schematic structural diagram of a coupling circuit of a coupler according to yet another embodiment of the present application;

fig. 4a is a schematic circuit diagram of a coupling circuit of a coupler according to an embodiment of the present disclosure;

fig. 4b is a schematic circuit diagram of a coupling circuit of a coupler according to another embodiment of the present application;

fig. 4c is a schematic circuit diagram of a coupling circuit of a coupler according to another embodiment of the present application;

fig. 5 is a schematic circuit diagram of a coupling circuit of a coupler according to another embodiment of the present application;

fig. 6 is a schematic structural diagram of a coupler according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It is noted that the terminology used in the description of the embodiments of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application. In the description of the embodiments of the present application, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an associative relationship describing an association, meaning that there may be three relationships, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more, and "at least one", "one or more" means one, two or more, unless otherwise specified.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features.

Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.

The embodiment of the application firstly provides a coupling circuit of a coupler. Fig. 1 is a schematic structural diagram of a coupling circuit of a coupler according to an embodiment of the present disclosure. As shown in fig. 1, the coupling circuit may include n coupled lines (coupled line 1 to coupled line n), n filter units (filter unit 1 to filter unit n), and a coupling degree adjustment unit 11. Wherein n is an integer greater than 1.

Specifically, each of the coupled lines 1 to n is coupled to a main transmission line (not shown) of the coupler. Since the coupling lines 1 to n are coupled with the main transmission line, the radio frequency signal on the main transmission line can be coupled to the coupling lines 1 to n through spatial radiation, that is, the coupling lines 1 to n are used for coupling the radio frequency signal from the main transmission line.

The different coupling lines are used for coupling the radio-frequency signals in different frequency bands from the main transmission line, that is, the frequency bands of the radio-frequency signals coupled from the main transmission line to the different coupling lines are different. The frequency bands of the radio frequency signals used for coupling by the different coupling lines can be set according to actual requirements, and are not particularly limited herein.

By way of example and not limitation, n may be 3, i.e., the coupler may include 3 coupled lines. The 3 coupling lines can be respectively used for coupling radio frequency signals of a low frequency band, a medium frequency band and a high frequency band from the main transmission line. The frequency ranges corresponding to the low frequency band, the middle frequency band and the high frequency band may be set according to actual requirements, and are not particularly limited herein.

In specific application, the coupling lines 1 to n may be microstrip lines, strip lines, coaxial lines, or waveguides, and may be specifically set according to actual requirements, and no particular limitation is imposed thereon.

Because there may be spurious signals whose frequencies are not within the frequency band of the rf signals used by the coupling lines for coupling in the rf signals to which the coupling lines are actually coupled, the embodiment of the present application performs filtering processing on the rf signals at the first end of each coupling line by setting a corresponding filtering unit at the first end of the coupling line.

In particular, the input of each filter unit is connected to a first end of one of the coupled lines. The filtering unit is used for filtering the radio-frequency signals at the first end of the coupling line connected with the filtering unit so as to filter out the radio-frequency signals with the frequency not in the target frequency band and output the radio-frequency signals after filtering.

The target frequency band is a frequency band of a radio frequency signal for coupling with a coupling line connected to the filtering unit, that is, the filtering unit connected to different coupling lines is used for filtering signals outside different frequency bands.

For example, if the coupler includes 3 coupling lines, and the 3 coupling lines are respectively used for coupling the radio frequency signals of the low frequency band, the intermediate frequency band and the high frequency band from the main transmission line, the filter units connected to the 3 coupling lines may be a low frequency filter unit, an intermediate frequency filter unit and a high frequency filter unit, respectively. The low-frequency filtering unit can be used for filtering radio-frequency signals with frequencies not in a low frequency range, the intermediate-frequency filtering unit can be used for filtering radio-frequency signals with frequencies not in an intermediate frequency range, and the high-frequency filtering unit can be used for filtering radio-frequency signals with frequencies not in a high frequency range.

Specifically, the coupling degree adjusting unit 11 may include n input ends and an output end, the n input ends of the coupling degree adjusting unit 11 are respectively connected with the output ends of the n filtering units, and the output end of the coupling degree adjusting unit 11 is connected with the coupling end a of the coupler. The coupling degree adjusting unit 11 is configured to perform power adjustment on the radio frequency signals output by the n filtering units, and output a radio frequency signal with a power value meeting a preset requirement through an output end of the coupling degree adjusting unit 11.

The preset requirement can be set according to the coupling degree required in practical application. For example, the preset requirements may be: the power value is greater than or equal to the target power value. The target power value is the minimum power value of the radio frequency signal output by the coupling degree adjusting unit 11 that can make the coupling degree meet the requirement.

In a specific application, as an example and not by way of limitation, the performing, by the coupling adjustment unit 11, power adjustment on the radio frequency signals output by the n filtering units may specifically include: and carrying out power selection, combination and/or power attenuation and other processing on the n radio frequency signals so as to enable the power value of the radio frequency signals output by the n radio frequency signals to meet the preset requirement.

It can be seen from the above that, the coupling circuit of the coupler provided in this embodiment includes n coupling lines, different coupling lines are used for coupling the radio frequency signals in different frequency bands from the main transmission line of the coupler, the first end of each coupling line is connected to one filtering unit, and the filtering unit filters out the radio frequency signals whose frequencies are not in the frequency band corresponding to the coupling line connected to the filtering unit, so that the frequencies of the radio frequency signals output by each filtering unit are all in the corresponding frequency band, that is, each filtering unit can suppress the coupling degree and the isolation degree of the coupler outside each corresponding frequency band, and thus the coupler has good directivity in each frequency band. In addition, each filtering unit also outputs the filtered radio-frequency signals to the coupling degree adjusting unit, and the coupling degree adjusting unit is used for adjusting the power of the received radio-frequency signals and outputting the radio-frequency signals with the power values meeting the preset requirements, so that the coupling degree of the coupler can meet the preset requirements. In summary, the coupler provided by the embodiment of the present application can be applicable to a plurality of frequency bands, and has good directivity in each frequency band, and the coupling degree when the coupler is applied to different frequency bands can reach the preset requirement by adjusting.

Please refer to fig. 2a to fig. 2c, which are schematic structural diagrams of a coupling circuit of a coupler according to another embodiment of the present disclosure. As shown in fig. 2a to 2c, the present embodiment is different from the embodiment corresponding to fig. 1 in that the coupling degree adjusting unit 11 in the present embodiment includes m combiners, and m is a positive integer.

Each of the combiners includes at least two input terminals and an output terminal, and each of the input terminals of each of the combiners may be connected to an output terminal of one of the filtering units or may be connected to an output terminal of one of the other combiners. That is, the connection mode of the input terminal of the combiner may include the following three cases:

(1) all input ends of the combiner are respectively connected with the output ends of different filtering units;

(2) some input ends of the combiner are respectively connected with the output end of a different filter unit, and other input ends of the combiner are respectively connected with the output end of a different combiner;

(3) all input ends of the combiner are respectively connected with the output ends of different other combiners.

The combiner is used for combining at least two paths of radio frequency signals received by the input end of the combiner into one path of radio frequency signals and outputting the path of radio frequency signals obtained by combining through the output end. It should be noted that the power of the radio frequency signal output by the combiner is the sum of the powers of the radio frequency signals received by all the input terminals of the combiner. For example, if a combiner includes two input ends, the powers of the radio frequency signals received by the two input ends are P1 and P2, respectively, and the combiner combines the two received radio frequency signals into one radio frequency signal, the power of the radio frequency signal obtained by combining is P1+ P2.

In this embodiment, the output end of the combiner that combines the radio frequency signals output by all the filtering units is connected to the coupling end a of the coupler. The way the combiner is connected in the circuit is exemplarily described below.

In one example, as shown in fig. 2a, each of the combiners may include two input terminals, and the coupling degree adjusting unit 11 may include n-1 combiners. Each input end of the 1 st combiner (i.e., combiner 1) may be connected to an output end of a different filtering unit, one input end of each of the 2 nd to the (n-1) th combiners (i.e., combiners 2 to n-1) may be connected to an output end of one filtering unit, another input end of each of the 2 nd to (n-1) th combiners may be connected to an output end of the previous combiner, and an output end of the nth combiner (i.e., combiner n) may be connected to a coupling end a of the coupler. For example, two input terminals of the combiner 1 may be connected to the output terminal of the filtering unit 1 and the output terminal of the filtering unit 2, respectively; two input ends of the combiner 2 may be respectively connected with the output end of the filtering unit 3 and the output end of the combiner 1; by analogy, two input ends of the combiner n-1 can be respectively connected with the output end of the filtering unit n and the output end of the combiner n-2, and the output end of the combiner n-1 can be connected with the coupling end a. Of course, in other implementation manners, the combiner may further include more input ends, and a connection manner of the combiner in the circuit may be similar to that in the example, and reference may be specifically made to the relevant description in the example, which is not described herein again.

In yet another example, as shown in fig. 2b, each input terminal of the 1 st to the r-th combiners (i.e., combiners 1 to r) may be respectively connected to an output terminal of a different one of the filtering units, and each input terminal of the remaining combiners (i.e., combiners r +1 to m) may be respectively connected to an output terminal of a different one of the other combiners. R is an integer, r is smaller than m, and a value of r may be determined according to the number of the filtering units, the number of the input terminals of each combiner, and a connection manner of the combiners in the circuit, which is not particularly limited herein.

In yet another example, as shown in fig. 2c, the number of input terminals of the combiner may be greater than or equal to n, and thus, the coupling degree adjusting unit 11 may include only one combiner. Each input end of the combiner is respectively connected with the output end of one filtering unit, and the output end of the combiner is connected with the coupling end A of the coupler.

In this embodiment, the combiner is disposed in the coupling degree adjusting unit, the radio frequency signal with the power value meeting the preset requirement is synthesized by the combiner, and the radio frequency signal is output from the coupling end of the coupler, so that the coupling degree of the coupler can be adjusted.

With reference to fig. 2a to fig. 2c, in another embodiment of the present application, the coupling degree adjusting unit 11 may further include n first power attenuation circuits (the first power attenuation circuit 1 to the first power attenuation circuit n).

Each first power attenuation circuit is connected between the output end of one filtering unit and one input end of the combiner. Specifically, an input terminal of each first power attenuation circuit may be connected to an output terminal of one filtering unit, and an output terminal of each first power attenuation circuit may be connected to one input terminal of the combiner.

The first power attenuation circuit is used for carrying out power attenuation on the radio-frequency signal output by the filter unit connected with the first power attenuation circuit. It should be noted that the power attenuation amounts of the first power attenuation circuits connected to different filter units may be the same or different, and may be specifically set according to actual requirements, and are not particularly limited herein.

In a specific application, the first power attenuation circuit can be a pi-type attenuation circuit or a T-type attenuation circuit and the like.

In this embodiment, the first power attenuation circuit is disposed at the output end of each filtering unit to attenuate the power of the radio frequency signal input to the combiner, so as to adjust the power of the radio frequency signal output from the combiner to the coupling end, and further adjust the coupling degree of the coupler.

With reference to fig. 2a to 2c, in another embodiment of the present application, the coupling adjustment unit 11 may further include m second power attenuation circuits (second power attenuation circuit 1 to second power attenuation circuit m).

And each second power attenuation circuit is connected with the output end of one combiner. Specifically, the input terminal of each second power attenuation circuit may be connected to the output terminal of one combiner. Of the m second power attenuation circuits, an output end of the second power attenuation circuit connected to the combiner that combines the radio frequency signals output by all the filter units is connected to a coupling end of the coupler, and an output end of each of the remaining second power attenuation circuits may be connected to an input end of one of the other combiners.

The second power attenuation circuit is used for carrying out power attenuation on the radio-frequency signal output by the combiner connected with the second power attenuation circuit. It should be noted that the power attenuation amounts of the second power attenuation circuits connected to different combiners may be the same or different, and may be specifically set according to actual requirements, and are not particularly limited herein.

In a specific application, the second power attenuation circuit can be a pi-type attenuation circuit or a T-type attenuation circuit and the like.

In this embodiment, the second power attenuation circuit is disposed at the output end of each combiner to attenuate the power of the radio frequency signal output by the combiner, so that the coupling degree of the coupler can be adjusted.

With reference to fig. 2a to 2c, in another embodiment of the present application, the coupling circuit may further include n isolation degree adjusting units (isolation degree adjusting unit 1 to isolation degree adjusting unit n). Wherein each isolation adjusting unit is connected with the second end of one coupled line. The isolation adjusting unit is used for adjusting the power of the radio-frequency signal at the second end of the coupled line connected with the isolation adjusting unit.

Illustratively, the isolation adjusting unit 1 may be connected to the second end of the coupling line 1, the isolation adjusting unit 2 may be connected to the second end of the coupling line 2, and so on, and the isolation adjusting unit n may be connected to the second end of the coupling line n.

In this embodiment, the isolation adjusting unit is disposed at the second end of each coupling line to adjust the power of the rf signal at the second end of the coupling line, so as to adjust the isolation of the coupler.

Fig. 3 is a schematic structural diagram of a coupling circuit of a coupler according to another embodiment of the present disclosure. As shown in fig. 3, the present embodiment is different from the embodiment corresponding to fig. 1 in that the coupling degree adjusting unit 11 in the present embodiment includes a multiplexer (may also be referred to as a multiplexer) 111. The multiplexer 111 comprises at least n inputs and one output.

Each input terminal of the multiplexer 111 is connected to an output terminal of one filtering unit, and an output terminal of the multiplexer 111 serves as an output terminal of the coupling degree adjusting unit 11. The multiplexer 111 is configured to select one of the radio frequency signals output by all the filtering units and output the selected radio frequency signal to the coupling terminal a.

In a specific application, the multiplexer 111 may be connected to a control unit (not shown). The control unit may send a control instruction to the multiplexer 111. The multiplexer 111 may select one of the rf signals output by the filtering units according to the control command, where the one of the rf signals is indicated by the control command.

In this embodiment, the multiplexer is disposed between the output end of each filtering unit and the coupling end of the coupler, and the power of the radio frequency signal output to the coupling end is selected by the multiplexer, so that the coupling degree of the coupler can be adjusted.

Referring to fig. 3, in another embodiment of the present application, the coupling adjustment unit 11 further includes n third power attenuation circuits (third power attenuation circuit 1 to third power attenuation circuit n).

Wherein each third power attenuation circuit is connected between an output of one filter unit and one input of the multiplexer 111. Specifically, an input terminal of each third power attenuation circuit may be connected to an output terminal of one filtering unit, and an output terminal of each third power attenuation circuit may be connected to one input terminal of the multiplexer 111. Illustratively, the third power attenuation circuit 1 may be connected between the output of the filtering unit 1 and the 1 st input of the multiplexer 111, the third power attenuation circuit 2 may be connected between the output of the filtering unit 2 and the 2 nd input of the multiplexer 111, and so on, and the third power attenuation circuit n may be connected between the output of the filtering unit n and the nth input of the multiplexer 111.

The third power attenuation circuit is used for carrying out power attenuation on the radio-frequency signal output by the filter unit connected with the third power attenuation circuit. It should be noted that the power attenuation amounts of the third power attenuation circuits connected to different filter units may be the same or different, and may be specifically set according to actual requirements, which is not particularly limited herein.

In a specific application, the third power attenuation circuit can be a pi-type attenuation circuit or a T-type attenuation circuit, etc.

In this embodiment, the third power attenuation circuit is disposed between each filtering unit and each input terminal of the multiplexer to attenuate the power of the rf signal input to the multiplexer, so as to adjust the power of the rf signal output from the multiplexer to the coupling terminal, and further adjust the coupling degree of the coupler.

Referring to fig. 3, in another embodiment of the present application, the coupling adjustment unit 11 further includes a fourth power attenuation circuit 112. The fourth power attenuation circuit 112 is connected between the output terminal of the multiplexer 111 and the coupling terminal a of the coupler. The fourth power attenuation circuit 112 is used for power attenuation of the radio frequency signal output by the multiplexer 111.

In a specific application, the fourth power attenuation circuit 112 may be a pi-type attenuation circuit or a T-type attenuation circuit.

In this embodiment, the fourth power attenuation circuit is arranged between the multiplexer and the coupling end of the coupler to attenuate the power of the radio frequency signal output by the multiplexer, so that the power of the radio frequency signal output from the multiplexer to the coupling end is adjusted, and the coupling degree of the coupler is adjusted.

Referring to fig. 3, in another embodiment of the present application, the coupling circuit further includes n isolation degree adjusting units (isolation degree adjusting unit 1-isolation degree adjusting unit n). Wherein each isolation adjusting unit is connected with the second end of one coupled line. The isolation adjusting unit is used for adjusting the power of the radio-frequency signal at the second end of the coupled line connected with the isolation adjusting unit.

Illustratively, the isolation adjusting unit 1 may be connected to the second end of the coupling line 1, the isolation adjusting unit 2 may be connected to the second end of the coupling line 2, and so on, and the isolation adjusting unit n may be connected to the second end of the coupling line n.

In this embodiment, the isolation adjusting unit is disposed at the second end of each coupling line to adjust the power of the rf signal at the second end of the coupling line, so as to adjust the isolation of the coupler.

Please refer to fig. 4a to fig. 4c, which are schematic circuit diagrams of a coupling circuit of a coupler according to an embodiment of the present disclosure. This embodiment is further defined in the embodiments corresponding to fig. 2a to 2 c. As shown in fig. 4a to 4c, in the present embodiment, the filter unit may be a filter circuit composed of an inductor and/or a capacitor.

For example, when the coupling line connected to the filtering unit is used for coupling the low-frequency rf signal, the filtering unit may include a first capacitor C1, a second capacitor C2, and a first inductor L1. The first end of the first inductor L1 and the first end of the first capacitor C1 are connected in common and serve as the input end of the filter unit, the second end of the first inductor L1 and the first end of the second capacitor C2 are connected in common and serve as the output end of the filter unit, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are both grounded.

When the coupling line connected to the filtering unit is used for coupling the high-frequency rf signal, the filtering unit may include a second inductor L2, a third inductor L3, and a third capacitor C3. The first end of the third capacitor C3 and the first end of the second inductor L2 are connected in common and serve as the input end of the filter unit, the second end of the third capacitor C3 and the first end of the third inductor L3 are connected in common and serve as the output end of the filter unit, and the second end of the second inductor L2 and the second end of the third inductor L3 are both grounded.

When the coupling line to which the filtering unit is connected is used to couple the intermediate frequency radio frequency signal, the filtering unit may include a fourth capacitor C4 and a fourth inductor L4. The first end of the fourth capacitor C4 is used as the input end of the filter unit, the second end of the fourth capacitor C4 and the first end of the fourth inductor L4 are connected in common and used as the output end of the filter unit, and the second end of the fourth inductor L4 is connected to ground.

Referring to fig. 4a to 4c, in another embodiment of the present application, the first power attenuation circuit may be a pi-type attenuation circuit composed of a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. The first end of the seventh resistor R7 and the first end of the eighth resistor R8 are connected in common and serve as the input end of the first power attenuation circuit, the second end of the seventh resistor R7 and the first end of the ninth resistor R9 are connected in common and serve as the output end of the first power attenuation circuit, and the second end of the eighth resistor R8 and the second end of the ninth resistor R9 are both grounded.

In a specific application, the resistance of the seventh resistor R7, the resistance of the eighth resistor R8, and the resistance of the ninth resistor R9 in the first power attenuation circuit connected to different filter units may be the same or different, and may specifically be determined according to the power attenuation amount of the first power attenuation circuit connected to different filter units.

With continued reference to fig. 4a to 4c, in another embodiment of the present application, the second power attenuation circuit may be a pi-type attenuation circuit composed of a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12. The first end of the tenth resistor R10 and the first end of the eleventh resistor R11 are connected in common and serve as the input end of the second power attenuation circuit, the second end of the tenth resistor R10 and the first end of the twelfth resistor R12 are connected in common and serve as the output end of the second power attenuation circuit, and the second end of the eleventh resistor R11 and the second end of the twelfth resistor R12 are both grounded.

In a specific application, when the coupling degree adjusting unit 11 includes a plurality of second power attenuation circuits, the resistance of the tenth resistor R10, the resistance of the eleventh resistor R11, and the resistance of the twelfth resistor R12 in the second power attenuation circuits connected to different combiners may be the same or different, and may specifically be determined according to the power attenuation amounts of the second power attenuation circuits connected to different filter units.

With continued reference to fig. 4a to 4c, in another embodiment of the present application, the isolation adjustment unit may include a potentiometer (i.e., an adjustable resistor) RV. The first end of the potentiometer RV can be connected with the second end of the coupling line, the second end of the potentiometer RV is in idle connection, and the adjusting end of the potentiometer RV is grounded.

In a specific application, the adjustable ranges of the resistances of the potentiometers included in the isolation adjusting units connected to different coupling lines may be different or the same, and may be specifically set according to actual requirements, and no particular limitation is imposed on the ranges.

Fig. 5 is a schematic circuit diagram of a coupling circuit of a coupler according to another embodiment of the present disclosure. This embodiment is further defined in the embodiment corresponding to fig. 3. It should be noted that specific structures of the filtering unit and the isolation adjusting unit in this embodiment are the same as those of the filtering unit and the isolation adjusting unit in the embodiment corresponding to fig. 4, and reference may be specifically made to the related description in fig. 4, which is not described herein again.

As shown in fig. 5, in the present embodiment, the third power attenuation circuit may be a pi-type attenuation circuit composed of a first resistor R1, a second resistor R2 and a third resistor R3. The first end of the first resistor R1 and the first end of the second resistor R2 are connected in common and serve as the input end of the third power attenuation circuit, the second end of the first resistor R1 and the first end of the third resistor R3 are connected in common and serve as the output end of the third power attenuation circuit, and the second end of the second resistor R2 and the second end of the third resistor R3 are both grounded.

In a specific application, the resistance value of the first resistor R1, the resistance value of the second resistor R2, and the resistance value of the third resistor R3 in the third power attenuation circuit connected to different filter units may be the same or different, and may specifically be determined according to the power attenuation amount of the third power attenuation circuit connected to different filter units.

Referring to fig. 5, in another embodiment of the present application, the fourth power attenuation circuit 112 may be a pi-type attenuation circuit composed of a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The first end of the fourth resistor R4 and the first end of the fifth resistor R5 are connected in common and serve as the input end of the fourth power attenuation circuit 112, the second end of the fourth resistor R4 and the first end of the sixth resistor R6 are connected in common and serve as the output end of the fourth power attenuation circuit 112, and the second end of the fifth resistor R5 and the second end of the sixth resistor R6 are both grounded.

The embodiment of the application also provides a coupler. Fig. 6 is a schematic structural diagram of a coupler according to an embodiment of the present disclosure. By way of example, and not limitation, coupler 60 may be a directional coupler.

Specifically, the coupler 60 may include an input terminal B, a through terminal C, a coupling terminal a, an isolation terminal (not shown), and a main transmission line 61 connected between the input terminal B and the through terminal C.

In the embodiment of the present application, the coupler 60 further includes a coupling circuit in each of the embodiments corresponding to fig. 1 to 5. For the description of the coupling circuit, reference may be specifically made to fig. 1 to 5 and the related description in the embodiment corresponding to fig. 1 to 5, and details are not repeated here.

The embodiment of the application also provides communication equipment. Please refer to fig. 7, which is a schematic structural diagram of a communication device according to an embodiment of the present disclosure. As shown in fig. 7, the communication device 70 may include a coupler 60.

The coupler 60 may be the coupler 60 in the embodiment corresponding to fig. 6, and specific reference may be made to fig. 6 and the description in the embodiment corresponding to fig. 6 for the description of the coupler 60, which is not repeated herein.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A coupling circuit of a coupler, comprising:

the n coupling lines are coupled with a main transmission line of the coupler and are used for coupling radio-frequency signals from the main transmission line; different coupling lines are used for coupling radio frequency signals in different frequency bands;

the input end of each filtering unit is connected with the first end of one coupling line, and the filtering units are used for filtering the radio-frequency signals at the first ends of the coupling lines connected with the filtering units so as to filter the radio-frequency signals with frequencies not within a target frequency band and output the radio-frequency signals after filtering; the target frequency band is a frequency band of a radio frequency signal which is used for coupling by a coupling line connected with the filtering unit;

the coupling degree adjusting unit is connected with the output ends of the n filtering units respectively at n input ends, and the output end of the coupling degree adjusting unit is connected with the coupling end of the coupler; the coupling degree adjusting unit is used for adjusting the power of the radio-frequency signals output by the n filtering units and outputting a radio-frequency signal with a power value meeting a preset requirement through the output end of the coupling degree adjusting unit; wherein n is an integer greater than 1.

2. The coupling circuit according to claim 1, wherein the coupling degree adjusting unit comprises m combiners, m being a positive integer; each combiner comprises at least two input ends and an output end, and each input end of the combiner is connected with the output end of one filtering unit or the output end of one other combiner; the combiner is used for combining at least two paths of radio frequency signals received by the input end of the combiner into one path of radio frequency signals and outputting the radio frequency signals obtained by combining through the output end of the combiner; the output end of the combiner which combines the radio-frequency signals output by all the filtering units is connected with the coupling end.

3. The coupling circuit of claim 2, wherein the coupling degree adjustment unit further comprises n first power attenuation circuits; each of the first power attenuation circuits is connected between an output terminal of one of the filtering units and one input terminal of the combiner.

4. The coupling circuit according to claim 2 or 3, wherein the coupling degree adjustment unit further comprises m second power attenuation circuits; each second power attenuation circuit is connected with the output end of one combiner.

5. The coupling circuit according to claim 1, wherein the coupling degree adjusting unit includes a multiplexer; each input end of the multiplexer is connected with the output end of one filtering unit, and the output end of the multiplexer is used as the output end of the coupling degree adjusting unit; the multiplexer is used for selecting one path of radio frequency signal from the radio frequency signals output by all the filtering units and outputting the selected path of radio frequency signal.

6. The coupling circuit of claim 5, wherein the coupling degree adjustment unit further comprises n third power attenuation circuits; each of the third power attenuation circuits is connected between an output terminal of one of the filter units and an input terminal of the multiplexer.

7. The coupling circuit according to claim 5 or 6, wherein the coupling degree adjustment unit further comprises a fourth power attenuation circuit; the fourth power attenuation circuit is connected between the output end of the multiplexer and the coupling end.

8. The coupling circuit according to claim 2 or 5, further comprising n isolation adjustment units; each isolation degree adjusting unit is connected with the second end of one coupling line; the isolation degree adjusting unit is used for adjusting the power of the radio frequency signal at the second end of the coupled line connected with the isolation degree adjusting unit.

9. A coupler comprises an input end, a straight-through end, a coupling end, an isolating end and a main transmission line connected between the input end and the straight-through end; characterized in that the coupler further comprises a coupling circuit according to any of claims 1 to 8.

10. A communication device comprising the coupler of claim 9.

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