CN219266374U - Mismatch load device - Google Patents
Mismatch load device Download PDFInfo
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- CN219266374U CN219266374U CN202320202593.4U CN202320202593U CN219266374U CN 219266374 U CN219266374 U CN 219266374U CN 202320202593 U CN202320202593 U CN 202320202593U CN 219266374 U CN219266374 U CN 219266374U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The utility model relates to the technical field of microwaves, in particular to a mismatched load device, which comprises: an input terminal and a ground terminal; n loads with preset resistance values are connected in parallel, the N loads with preset resistance values are positioned between the input end and the grounding end, and N is determined based on standing wave ratio; one end of each load in the N loads with preset resistance values is connected with a grounding end; when N is an even number, taking loads with every two preset resistance values as a group of loads, wherein the interconnection position of the other end of each load in each group of loads is a connection point, the input end is sequentially connected with N/2 connection points, and impedance lines are arranged between the adjacent connection points and between the input end and the first connection point; when N is odd, the input end is sequentially connected with the (N-1)/2 connection points and the last load, impedance lines are arranged between the adjacent connection points, between the input end and the first connection point and between the last load and the (N-1)/2 connection point, and the problem of large load volume and insufficient space caused by load lamination arrangement is avoided.
Description
Technical Field
The utility model relates to the technical field of microwaves, in particular to a mismatched load device
Background
A mismatch load is required when testing a mismatch performance index of a power amplifier, and is used for performance testing of a transmitter and the power amplifier in a mismatch state, specifically, the mismatch load is a load that absorbs a part of microwave power and then reflects a part of the microwave power.
Under the general condition, according to different standing wave ratios, a plurality of loads with the same resistance value are connected in parallel to obtain mismatched loads, a conventional parallel connection mode needs to occupy a larger space, the requirement of miniaturization of devices cannot be met, the volume of a high-power load is also larger, the space position is insufficient in a mode of directly welding the plurality of loads, and the problems of grounding and heat dissipation of the resistor exist in the overlapped welding mode.
Disclosure of Invention
The present utility model has been made in view of the above problems, and it is an object of the present utility model to provide a mismatched load device that overcomes or at least partially solves the above problems.
The utility model provides a mismatched load device, comprising:
an input terminal and a ground terminal;
n loads with preset resistance values are connected in parallel, the N loads with the preset resistance values are positioned between the input end and the grounding end, N is greater than or equal to 3, and N is determined based on standing wave ratio;
one end of each load in the N loads with preset resistance values is connected with a grounding end;
when N is even, taking every two loads with preset resistance values as a group of loads, wherein the connection point of the other end of each load in each group of loads is a connection point, the input end is sequentially connected with N/2 connection points, and impedance lines are arranged between the adjacent connection points and between the input end and the first connection point;
when N is odd, every two loads with preset resistance values are taken as a group of loads, the last load with preset resistance value is left, the connection point is at the other end of each load in each group of loads, the input end is sequentially connected with (N-1)/2 connection points and the last load with preset resistance value, and impedance lines are arranged between the adjacent connection points, between the input end and the first connection point and between the last load with preset resistance value and the (N-1)/2 connection point.
Further, the two loads in each group of loads are respectively distributed on two sides of the connecting line where the corresponding connecting point is located.
Further, the impedance line is specifically a microstrip line.
Further, the impedance of the impedance line is determined based on the set position.
Further, the length of the impedance line is determined based on the frequency of the signal input by the input terminal.
Further, when N is an odd number, each connection point adopts a cross-shaped connection structure.
Further, when N is even, the N/2 connection points of the N/2 th group of loads adopt T-shaped connection structures, and each connection point from the first connection point to the N/2-1 connection point adopts a cross-shaped connection structure.
Further, the load with the preset resistance value is specifically a load of 50Ω or a load of 75Ω.
One or more technical solutions in the embodiments of the present utility model at least have the following technical effects or advantages:
the utility model provides a mismatch load device, comprising: an input terminal and a ground terminal; n loads with preset resistance values are connected in parallel, the N loads with the preset resistance values are positioned between the input end and the grounding end, N is greater than or equal to 3, and N is determined based on standing wave ratio; one end of each load in N loads with preset resistance values is connected with a grounding end; when N is even, taking every two loads with preset resistance values as a group of loads, wherein the connection point of the other end of each load in each group of loads is a connection point, the input end is sequentially connected with N/2 connection points, and impedance lines are arranged between the adjacent connection points and between the input end and the first connection point; when N is odd, with every two loads of preset resistance value as a set of load, the other end interconnect department of every load of remaining last preset resistance value in every group load is the tie point, connect in order between input and (N-1)/2 tie points and the last load of preset resistance value, and all be provided with the impedance line between adjacent tie point, between input and first tie point and last load of preset resistance value and (N-1)/2 tie point, through the mode that combines impedance line and load, connect the load in parallel with other load through the impedance line, prolonged every parallel load limit position, avoid the load volume that the load stromatolite was arranged and is caused big, the problem of space inadequacy.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also throughout the drawings, like reference numerals are used to designate like parts. In the drawings:
fig. 1 shows a standing wave ratio of 3:1, a mismatch load model;
fig. 2 shows a standing wave ratio of 4:1, a mismatch load model;
fig. 3 shows a standing wave ratio of 5:1, a mismatch load model;
fig. 4 shows a schematic structural diagram of a mismatched load device when the standing-wave ratio is even in an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a T-shaped connection structure according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a cross-type connection structure in an embodiment of the utility model;
fig. 7 is a schematic structural diagram of a mismatched load device when standing-wave ratio is odd in an embodiment of the present utility model;
fig. 8 shows that the counter standing wave ratio is 5 in the embodiment of the present utility model: 1, an S11 curve schematic diagram of a mismatched load device;
fig. 9 shows that the counter standing wave ratio is 5 in the embodiment of the present utility model: 1, and a test result curve diagram of the mismatch load device.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present utility model, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Before describing the mismatched load device of the present utility model, as shown in fig. 1, 2 and 3, the standing-wave ratio is 3:1, the mismatch load and standing wave ratio of 4:1, the mismatch load and standing wave ratio is 5:1 is shown.
Aiming at standing wave ratios of different mismatched loads, the characteristic impedance corresponding to the corresponding mismatched load can be obtained. Wherein standing wave ratio
Reflection coefficient->
From this, the characteristic impedance Z can be calculated 0 Corresponding resistance Z 1 Resistance value of (2).
For example, taking a load of 50 Ω each as an example, 3: z corresponding to mismatch load of 1 standing wave ratio 1 = 16.667 Ω, i.e. three 50Ω loads Z 0 And are connected in parallel. 4: z corresponding to mismatch load of 1 standing wave ratio 1 =12.5Ω, i.e. four 50Ω loads Z 0 And are connected in parallel. 5: z corresponding to mismatch load of 1 standing wave ratio 1 =10Ω, i.e. five 50Ω loads Z 0 And are connected in parallel.
The embodiment of the utility model provides a mismatched load device, as shown in fig. 4 and 7, comprising:
an input terminal 101 and a ground terminal 102;
wherein, one end of each load 103 in the N loads 103 with preset resistance values is connected with the grounding end 102;
when N is an even number, taking each two loads 103 with preset resistance values as a group of loads, wherein the connection point 104 is at the other end of each load 103 in each group of loads, the input end 101 is sequentially connected with N/2 connection points 104, and impedance lines 105 are arranged between the adjacent connection points 104 and between the input end 101 and the first connection point 104;
when N is an odd number, each two loads 103 with preset resistance values are taken as a group of loads, the last load 103 with preset resistance value is remained, the connection point 104 is at the other end of each load 103 in each group of loads, the input end 101 is sequentially connected with the (N-1)/2 connection points 104 and the last load 103 with preset resistance value, and the impedance lines 105 are arranged between the adjacent connection points 104, between the input end 101 and the first connection point 104 and between the last load 103 with preset resistance value and the (N-1)/2 connection point 104.
The following description will be given with N being an even number and N being an odd number, respectively:
when N is an even number, taking n=4 as an example, as shown in fig. 4: there are two sets of loads between the input terminal 101 and the ground terminal 102, and there are two connection points, including a first connection point 1041 and a second connection point 1042, respectively, so that the input terminal 101, the first connection point 1041 and the second connection point 1042 are sequentially connected to form a connection line. The two loads in each set of loads are respectively distributed on two sides of the connecting line where the corresponding connecting point is located, that is, the two loads in the first set of loads are respectively distributed on two sides of the connecting line where the first connecting point 1041 is located, and the two loads in the second set of loads are respectively distributed on two sides of the connecting line where the second connecting point 1042 is located, where the first connecting point 1041 and the second connecting point 1042 are the same. And the impedance lines 105 are disposed between the adjacent connection points 104, i.e., between the first connection point 1041 and the second connection point 1042, and between the input terminal 101 and the first connection point 1041.
The impedance line 105 employed here is specifically a microstrip line.
The impedance of the impedance line 105 is determined based on the set position. Specifically, when the preset resistance value of each load is 50Ω, the impedance of the impedance line 105 between the first connection point 1041 and the second connection point 1042 is 25Ω, and the impedance of the impedance line 105 between the input terminal 101 and the first connection point 1041 is 12.5Ω.
As shown in fig. 4, loads at different positions are denoted by R1, R2, R3, and R4. Since the impedance of the last impedance line 105 is determined by connecting the last load R3 (50Ω) and R4 (50Ω) in parallel to each other, the impedance of the last impedance line 105, that is, the impedance of the impedance line 105 between the first connection point 1041 and the second connection point 1042 is set to 25Ω. Next, the impedance of the impedance line 105 between the input terminal 101 and the first connection point 1041 is determined, and since the impedance after the three of R1, R2 and the last impedance line 105 are connected in parallel is 12.5Ω, the impedance of the impedance line 105 between the input terminal 101 and the first connection point 1041 is 12.5Ω. Of course, if there are more loads 103, the impedance of the increased impedance line 105 continues to be determined in the manner described above.
For the length of the impedance line 105, a signal wavelength is determined based on the signal frequency inputted from the input terminal 101, and the length of the impedance line 105 is
Where λ is the signal wavelength. Of course, depending on the size of the power load, a certain adjustment of the length of the impedance line 105 is required, and the impedance line may be properly adjusted to be too long, or too short to be properly adjusted to meet the range requirement, which is not limited herein.
In an alternative embodiment, when N is an even number, the N/2 connection point of the N/2 th group of loads adopts a T-shaped connection structure, as shown in fig. 5, and each of the first connection point to the N/2-1 connection point adopts a cross connection structure, as shown in fig. 6, four ends of the cross connection structure are respectively matched with the impedance of the corresponding connected load 103 or impedance line 105, and similarly, three ends of the T-shaped connection structure are respectively matched with the impedance of the corresponding load 103 or impedance line 105.
When N is an odd number, taking n=5 as an example, as shown in fig. 7: there are two sets of loads between the input 101 and the ground 102, and the last individual load 103, correspondingly, there are two connection points, a third connection point 1043 and a fourth connection point 1044. Therefore, the input end 101, the third connection point 1043, the fourth connection point 1044 and the last single load 103 are sequentially connected to form a connection line, wherein two loads in each group of loads are respectively distributed on two sides of the connection line where the connection point is located, that is, two loads in the first group of loads are respectively distributed on two sides of the connection line where the third connection point 1043 is located, two loads in the second group of loads are respectively distributed on two sides of the connection line where the fourth connection point 1044 is located, of course, the connection lines where the third connection point 1043 and the fourth connection point 1044 are located are the same, and impedance lines are respectively provided between the adjacent connection points 104, that is, between the third connection point 1043 and the fourth connection point 1044, and between the input end 101 and the third connection point 1044.
The impedance line 105 may also be a microstrip line in mismatched load arrangements with an odd number of loads.
Specifically, the impedance of the impedance line 105 is determined based on the set position, and when the preset impedance value of each load is 50Ω, the impedance of the impedance line 105 between the fourth connection point 1044 and the last individual load 103 is determined to be 50Ω, the impedance of the impedance line 105 between the third connection point 1043 and the fourth connection point 1044 is 16.67 Ω, and the impedance of the impedance line 105 between the input terminal 101 and the third connection point 1043 is 10Ω.
As shown in fig. 7, loads at different positions are marked with R1, R2, R3, R4, and R5 in the same manner as when N is an even number. The impedance of the corresponding impedance line 105 is determined by the parallel connection of the loads from the end, and will not be described in detail here.
The length of the impedance line 105 is also determined based on the frequency of the signal input by the input terminal 101, and will not be described in detail herein.
In an alternative embodiment, where N is an odd number, each connection point is a cross-type connection. The four ends of the cross-shaped connection structure are respectively matched with the impedance of the correspondingly connected load 103 or the impedance line 105.
By simulating the mismatch load device with n=5, an S11 curve corresponding to the input of signals with different frequencies is obtained, wherein S11 represents an input reflection coefficient, that is, an input return loss, can be used for representing a standing-wave ratio, and the S11 can be converted into a standing-wave ratio VSRW through a formula, as shown in fig. 8. Correspondingly, as shown in fig. 9, the simulation results are obtained.
In an alternative embodiment, the load with the preset resistance may also be 75Ω, although other loads may be used, which is not limited herein.
One or more technical solutions in the embodiments of the present utility model at least have the following technical effects or advantages:
the utility model provides a mismatch load device, comprising: an input terminal and a ground terminal; n loads with preset resistance values are connected in parallel, the N loads with the preset resistance values are positioned between the input end and the grounding end, N is greater than or equal to 3, and N is determined based on standing wave ratio; one end of each load in N loads with preset resistance values is connected with a grounding end; when N is even, taking every two loads with preset resistance values as a group of loads, wherein the interconnection position of the other end of each load in each group of loads is a connection point, the input end is sequentially connected with N/2 connection points, and impedance lines are arranged between the adjacent connection points and between the input end and the first connection point; when N is odd, with every two loads of preset resistance value as a set of load, the other end interconnect department of every load of remaining last preset resistance value in every group load is the tie point, connect in order between input and (N-1)/2 tie points and the last load of preset resistance value, and all be provided with the impedance line between adjacent tie point, between input and the first tie point and between last preset resistance value load and (N-1)/2 tie point, through the mode that combines impedance line and load, connect the load in parallel with other load through impedance line, prolonged every parallel load limit position, avoid the load volume that the load stromatolite was arranged and is caused big, the problem of space inadequacy.
While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A mismatched load device, comprising:
an input terminal and a ground terminal;
n loads with preset resistance values are connected in parallel, the N loads with the preset resistance values are positioned between the input end and the grounding end, N is greater than or equal to 3, and N is determined based on standing wave ratio;
one end of each load in the N loads with preset resistance values is connected with a grounding end;
when N is even, taking every two loads with preset resistance values as a group of loads, wherein the connection point of the other end of each load in each group of loads is a connection point, the input end is sequentially connected with N/2 connection points, and impedance lines are arranged between the adjacent connection points and between the input end and the first connection point;
when N is odd, every two loads with preset resistance values are taken as a group of loads, the last load with preset resistance value is left, the connection point is at the other end of each load in each group of loads, the input end is sequentially connected with (N-1)/2 connection points and the last load with preset resistance value, and impedance lines are arranged between the adjacent connection points, between the input end and the first connection point and between the last load with preset resistance value and the (N-1)/2 connection point.
2. The mismatched load device according to claim 1, wherein the two loads in each set of loads are respectively distributed on two sides of the connecting line where the corresponding connecting point is located.
3. The mismatched load device of claim 1, wherein the impedance line is embodied as a microstrip line.
4. The mismatched load device of claim 1, wherein the impedance of the impedance line is determined based on a set position.
5. The mismatched load device of claim 1, wherein the length of the impedance line is determined based on the frequency of the signal input at the input terminal.
6. The mismatched load device of claim 1, wherein each connection point is a cross-type connection when N is odd.
7. The mismatched load device according to claim 1, wherein when N is even, the N/2 connection points of the N/2 th group of loads are T-shaped connection structures, and each of the first connection points to the N/2-1 connection points is a cross-shaped connection structure.
8. The mismatched load device of claim 1, wherein the load of the preset resistance is in particular a load of 50Ω or a load of 75Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320202593.4U CN219266374U (en) | 2023-02-14 | 2023-02-14 | Mismatch load device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320202593.4U CN219266374U (en) | 2023-02-14 | 2023-02-14 | Mismatch load device |
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| CN219266374U true CN219266374U (en) | 2023-06-27 |
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| CN202320202593.4U Active CN219266374U (en) | 2023-02-14 | 2023-02-14 | Mismatch load device |
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| CN (1) | CN219266374U (en) |
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