CN115360493A - Broadband unequal-division-one-into-three power divider - Google Patents
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Abstract
The invention discloses a broadband unequal division one-in-three power divider, which comprises: the power divider comprises an input port, a power divider main body, a circuit board, three output ports and a power divider shell, wherein the circuit board is arranged on the power divider main body; the circuit board is provided with an input circuit, three N branch line circuits with unequal impedances, an isolation resistor arranged at the output end of each transmission line circuit in the three branch line circuits, and three output circuits, wherein N is a positive integer; the input port is connected with one end of the input circuit, the other end of the input circuit is connected with three branches with unequal N-section impedance, the three branches are respectively connected with three corresponding output circuits, and the three output circuits are respectively correspondingly connected with three output ports; each transmission line circuit adjusts the output amplitude value and phase value by changing three variables of the line width, the line length and the groove width of the transmission line, thereby reducing the transmission loss and the design difficulty of the power divider, improving the isolation degree and the matching degree of an output port and promoting the output phase consistency.
Description
Technical Field
The invention relates to the technical field of electronic information, in particular to a broadband unequal-division one-into-three power divider.
Background
The power divider is a device for dividing one path of input signal into two paths or multiple paths of equal or unequal energy outputs, and with the development of antenna technology, the broadband unequal division one-in-three power divider is widely applied, but a simple and effective design method of the broadband unequal division one-in-three power divider is not available so far.
In the design of a broadband unequal-division-one-division-three-power divider circuit in the related technology, the problem that each circuit is unequal in amplitude but identical in phase exists, and improved space exists in transmission loss, port matching degree, output port isolation degree, bearing power, design cost and output phase consistency.
Disclosure of Invention
The invention provides a broadband unequal-division one-division-three-power divider, which aims to solve the problems of transmission loss, port matching degree, output port isolation degree, bearing power, design cost, output phase consistency and the like in the design of a one-division-three-power divider circuit in the related technology.
According to the broadband unequal division-one-into-three power divider of the embodiment of the invention, the power divider comprises: the power divider comprises an input port, a power divider main body, a circuit board, three output ports and a power divider shell, wherein the circuit board is arranged on the power divider main body; the circuit board is provided with an input circuit, three paths of N branch line circuits with unequal impedance, an isolation resistor arranged at the output end of each transmission line circuit in the three paths of branch line circuits, and three paths of output circuits, wherein N is a positive integer; the input port is connected with one end of the input circuit, and the other end of the input circuit is connected with the three-way branch circuit with unequal N-section impedance; the three branches with unequal impedances are respectively connected with the corresponding three output circuits, the three output circuits are respectively connected with the first output port, the second output port and the third output port, and the output powers of the three output ports are unequal, wherein the output power of the middle second branch with unequal impedances is set to be larger than the output powers of the other two branches with unequal impedances; when the impedance value of the transmission line circuit is greater than or equal to a set impedance value, the transmission line circuit uses a coplanar waveguide circuit; when the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounded coplanar waveguide circuit; the coplanar waveguide circuit and the grounding coplanar waveguide circuit adjust the output amplitude value and the output phase value of each transmission line circuit by changing three variables of the line width, the line length and the groove width of the transmission line circuit.
According to an embodiment of the present invention, one end of the input circuit is connected to the input port, and the other end of the input circuit is connected to the three N-node unequal impedance branch line circuits, the impedance of the input circuit is 50 ohms, the length of the input circuit ranges from 2.5 mm to 3mm, and the input circuit uses a grounded coplanar waveguide circuit.
According to one embodiment of the invention, the number of nodes N of the three-path N-node impedance unequal branch line circuit is calculated and determined according to the bandwidth, the port standing wave ratio and the output port isolation; wherein N is a positive integer.
According to an embodiment of the present invention, determining the impedance value of the three-way N-segment impedance unequal branch line circuit according to the output power ratio of the three-way N-segment impedance unequal branch line circuit includes: combining two paths with lower power in the three paths of the N-section impedance unequal branch line circuits to obtain a combined circuit, and calculating the input impedance and the output impedance of each path of the N-section impedance unequal branch line circuit according to the ratio of the output power of the combined circuit to the output power of the other path of the N-section impedance unequal branch line circuit; the length of each section of the transmission line circuit is one quarter wavelength of the center frequency.
According to an embodiment of the present invention, N transmission line circuits are disposed in the three branch line circuits, an isolation resistor is disposed at an output end of each transmission line circuit, resistance values of the isolation resistors disposed at the output ends of the three same transmission line circuits are different, a vertical interconnection circuit is disposed at a middle position of each transmission line circuit, the vertical interconnection circuit passes through a circuit board dielectric layer and is connected to one end of the isolation resistor located in a bottom layer circuit, and the other end of the isolation resistor is connected to a common point.
According to an embodiment of the present invention, one end of the three-way output circuit is connected to the output end of the three-way N-segment impedance unequal stripline circuit, and the other end of the three-way output circuit is connected to the three output ports; the impedance of the three output circuits is unequal, the length of the three output circuits is a quarter wavelength of the central frequency, the three output circuits are respectively connected with the first output port, the second output port and the third output port, and when the impedance value of the transmission line circuit is greater than or equal to a set impedance value, the transmission line circuit uses a coplanar waveguide circuit; when the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounded coplanar waveguide circuit; and when the standing-wave ratio of the output port is greater than a preset threshold value, increasing the number of nodes of the three-way output circuit, wherein the length of the three-way M-node output circuit is the product of a quarter wavelength of the central frequency and the number of nodes M, wherein M is a positive integer.
According to an embodiment of the present invention, voltages at output ends of each branch line circuit in the three paths of N-node unequal impedance branch line circuits are equal or close to equal, impedances and output powers at output ends of the three paths of N-node unequal impedance branch line circuits are not equal, and voltage differences between two ends of all the isolation resistors are zero or close to zero.
The technical scheme provided by the embodiment of the invention at least has the following beneficial effects:
the invention provides a broadband unequal division one-into-three power divider, which comprises: the power divider comprises an input port, a power divider main body, a circuit board, three output ports and a power divider shell, wherein the circuit board is arranged on the power divider main body; the circuit board is provided with an input circuit, three N branch line circuits with unequal impedances, an isolation resistor arranged at the output end of each transmission line circuit in the three branch line circuits, and three output circuits, wherein N is a positive integer; the input port is connected with one end of the input circuit, and the other end of the input circuit is connected with the three branches with unequal N impedances; the three branches with unequal impedances are respectively connected with the corresponding three output circuits, the three output circuits are respectively correspondingly connected with the first output port, the second output port and the third output port, and the output powers of the three output ports are unequal, wherein the output power of the middle branch with unequal impedances of the second branch with unequal impedances is set to be larger than the output powers of the other branches with unequal impedances; the three paths of unequal-impedance branch line circuits are provided with N transmission line circuits, and when the impedance value of each transmission line circuit is greater than or equal to a set impedance value, the transmission line circuits use coplanar waveguide circuits; when the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounded coplanar waveguide circuit; the coplanar waveguide circuit and the grounding coplanar waveguide circuit adjust the output amplitude value and the output phase value of each transmission line circuit by changing three variables of the line width, the line length and the groove width of the transmission line circuit. Therefore, the broadband unequal-division-one-division-three-power divider simplifies the circuit design by combining the coplanar waveguide circuit and the grounded coplanar waveguide circuit, solves the problem that the broadband unequal-division-one-division-three-power divider has unequal design amplitude and the same phase, reduces the transmission loss, improves the isolation degree of the output port and the matching degree of each port, and improves the output phase consistency.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention and are not to be construed as limiting the invention.
Fig. 1 is a block diagram of a broadband unequal divide-by-three power divider in accordance with an exemplary embodiment;
fig. 2 is a circuit diagram of a top layer of a circuit board of a broadband unequal-division-one-to-three power divider according to an exemplary embodiment;
fig. 3 is a circuit diagram of a circuit board substrate of a broadband unequal-divide-by-three power divider according to an exemplary embodiment;
FIG. 4 is a schematic diagram of a simulation of a broadband unequal divide-by-three power divider shown in accordance with an exemplary embodiment;
fig. 5 is a diagram illustrating simulation results of transmission loss of a broadband unequal-division-one-three-division power divider according to an exemplary embodiment;
fig. 6 is a diagram illustrating a simulation result of an output port isolation of a broadband unequal-division-by-three power divider according to an exemplary embodiment;
fig. 7 is a diagram illustrating a port reflection simulation result of a broadband unequal-division-one-into-three power divider according to an exemplary embodiment;
fig. 8 is a diagram illustrating simulation results of transmission phases of a wideband unequal divide-by-three power divider according to an exemplary embodiment;
fig. 9 is a diagram illustrating a simulation result of a voltage across a fourth resistor of a broadband unequal-division-three-division power divider according to an exemplary embodiment.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The following describes the wideband unequal-division-one-into-three power divider provided in the embodiment of the present invention in detail with reference to the accompanying drawings.
The power divider is a device for dividing one input signal into two or more paths of equal or unequal energy outputs, and with the development of antenna technology, the broadband unequal division one-in-three power divider is widely applied, but a simple and effective design method of the broadband unequal division one-in-three power divider is not provided so far.
In the design of the broadband unequal-division-one-into-three power divider circuit in the related technology, there is still room for improvement in transmission loss, port matching degree, output port isolation degree, borne power, design difficulty and output phase consistency.
Therefore, the invention provides the broadband unequal-division one-in-three power divider which can reduce transmission loss, enhance port matching degree and output port isolation degree, reduce the design cost of the power divider and improve the output phase consistency.
Fig. 1 is a block diagram of a wideband unequal divide-by-three power divider in accordance with an example embodiment.
As shown in fig. 1, the broadband unequal-division-one-third power divider includes: input port, merit divide ware main part, circuit board, three output port and merit to divide ware casing.
The power divider shell covers the power divider main body to protect the power divider main body. The circuit board is arranged on the power divider main body, an input circuit, three branches with unequal impedance, N nodes, an isolation resistor arranged at the output end of each transmission line in the three branches, and three output circuits are arranged on the circuit board, and N is a positive integer; the input port is connected with one end of an input circuit, and the other end of the input circuit is connected with three branches with unequal N-section impedance; the three paths of branch line circuits with unequal impedances are respectively connected with the corresponding three paths of output circuits, the three paths of output circuits are respectively correspondingly connected with the first output port, the second output port and the third output port, and the output powers of the three output ports are unequal, wherein the output power of the middle second path of branch line circuit with unequal impedances is set to be larger than the output powers of the other two paths of branch line circuits with unequal impedances; the three paths of unequal-impedance branch line circuits are provided with N transmission line circuits, and when the impedance value of each transmission line circuit is greater than or equal to a set impedance value, the transmission line circuits use coplanar waveguide circuits; when the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounded coplanar waveguide circuit; the coplanar waveguide circuit and the grounding coplanar waveguide circuit adjust the output amplitude value and the output phase value of each transmission line circuit by changing three variables of the line width, the line length and the groove width of the transmission line circuit.
In the embodiment of the invention, one end of the input circuit is connected with the input port, the other end of the input circuit is connected with three branches with unequal N sections of impedance, the impedance of the input circuit is 50 ohms, the length range of the input circuit is 2.5-3mm, and the input circuit uses a grounded coplanar waveguide circuit.
The impedance of the input port is 50 ohms, the impedance of the three output ports is 50 ohms, the power P3 of the second output port is the largest in the three output ports, and the power P2 of the first output port is equal to the power P4 of the third output port.
In the embodiment of the invention, the set impedance value of the transmission line circuit is 65 ohm/A, if the impedance value of the transmission line circuit is larger than or equal to the set impedance value, the transmission line circuit uses a coplanar waveguide circuit, namely a conventional coplanar waveguide circuit; if the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounding coplanar waveguide circuit; wherein, A changes with the change of the center frequency, in the invention, the change range of the center frequency is 2-5 GHz, and the corresponding change range of A is [1,1.1].
In the embodiment of the invention, the coplanar waveguide circuit can be a conventional coplanar waveguide circuit and a grounded coplanar waveguide circuit, and when the impedance value of the transmission line circuit is greater than or equal to the set impedance value, the transmission line circuit preferentially uses the conventional coplanar waveguide circuit.
The transmission line circuit reduces the circuit loss by changing three variables of the line width, the line length and the groove width of the transmission line circuit under the condition of meeting phase and impedance design parameters, changes the circuit loss value to enable the loss value of a branch line of the three-way transmission line circuit to be close to the power ratio, enables the amplitude value of three-way output ends to be equal or close to equal, and enables the output phase value to be equal or close to equal.
In an embodiment of the present invention, the input circuit uses a grounded coplanar waveguide circuit, and the three-way output circuit uses a coplanar waveguide circuit (which includes a conventional coplanar waveguide circuit and a grounded coplanar waveguide circuit, preferably a conventional coplanar waveguide circuit). Calculating and determining the number N of the three branches of the circuit with the unequal N-section impedance according to the bandwidth, the standing-wave ratio of the port and the isolation degree of the output port; wherein N is a positive integer.
In the above embodiment, the impedance values of the branch lines of the three paths of N unequal-impedance transmission line circuits are unequal, and the impedance values of the three paths of output circuits are unequal.
In the embodiment of the present invention, determining the impedance value of the three paths of N-section impedance unequal branch line circuits according to the output power ratio of the three paths of N-section impedance unequal branch line circuits includes: combining two paths with lower power in the three paths of the N-section unequal impedance branch line circuits to obtain a combined circuit, and calculating the input impedance and the output impedance of each path of the N-section unequal impedance branch line circuits according to the ratio of the output power of the combined circuit to the output power of the other path of the N-section unequal impedance branch line circuit; the length of each transmission line circuit is one quarter wavelength of the center frequency.
The process of determining the impedance value of each transmission line circuit comprises the following steps: the input impedances of the branches of the three-way transmission line circuit are assumed to be: z in2 、Z in3 、Z in4 The output impedances of the three branch lines are respectively: z out2 、Z out3 、Z out4 . Firstly, the output powers P2 and P3 of two branch lines are combined into (P2 + P3), then the output power ratio of the power divider is (P2 + P3): P4, and the simplification is to
Suppose that
The formula is simplified to
Knowing the impedance ratio of a two-branch line circuit
From Z 0 ＝Z in(2+3) //Z in4 The input impedance of the branch circuit transmission line can be calculated,
output impedance of Z out4 ＝Z 0 ×k 1 ，
Then, assume the ratio of the output power P2 to the output power P3 is
By the way,
deriving the input impedance of the two branch lines as
The output impedance of the two branch lines is
Wherein k is 1 or more. And then according to the requirements of bandwidth, port standing wave ratio, output port isolation and the like, looking up a table or simulating to determine the number N of the sections of the transmission line circuit and the impedance value of each section of the transmission line circuit.
In the embodiment of the invention, one end of the three-path output circuit is connected with the output end of the three-path N-section impedance unequal branch circuit, and the other end of the three-path output circuit is connected with three output ports; the impedance of the three output circuits is unequal, the length of the three output circuits is a quarter wavelength of the central frequency, the three output circuits are respectively connected with the first output port, the second output port and the third output port, and when the impedance value of the transmission line circuit is greater than or equal to a set impedance value, the transmission line circuit uses a coplanar waveguide circuit; when the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounded coplanar waveguide circuit.
And when the standing-wave ratio of the output port is greater than a preset threshold value, increasing the number of nodes of the three-path output circuit, wherein the length of the three-path M-node output circuit is the product of a quarter wavelength of the central frequency and the number of nodes M, wherein M is a positive integer.
The standing-wave ratio is equal to 1, which is an ideal state, and generally, when the standing-wave ratio is below 1.5, most of the energy input to the power divider is output, only a small part of the energy is reflected back, and the preset threshold value can be selected to be 1.5.
In the embodiment of the invention, the voltage at the output end of each branch line circuit in the three-way N-section impedance unequal branch line circuit is equal or close to equal, the impedance and the output power at the output end of the three-way N-section impedance unequal branch line circuit are not equal, and the voltage difference between two ends of all the isolation resistors is zero or close to zero.
In the embodiment of the invention, N transmission line circuits are arranged in three branch line circuits, the output end of each transmission line circuit is provided with an isolation resistor, the resistance values of the isolation resistors arranged at the output ends of the three same transmission line circuits are different, a vertical interconnection circuit is arranged at the middle position of each transmission line circuit, the vertical interconnection circuit penetrates through a dielectric layer of a circuit board and is connected with one end of the isolation resistor positioned in a bottom layer circuit, and the other end of the isolation resistor is connected with a common point.
Coplanar waveguide circuits (conventional coplanar waveguide circuits) include a top large area ground circuit with no ground below the transmission line. The grounded coplanar waveguide circuit comprises a top layer large-area grounding circuit and a bottom layer large-area grounding circuit, wherein the top layer large-area grounding circuit and the bottom layer large-area grounding circuit are connected through a vertical interconnection circuit (such as a copper sinking hole and/or a screw hole). The grounding impedance of any two points in the top layer large-area grounding circuit and the bottom layer large-area grounding circuit is less than or equal to 0.5 ohm. The grounding circuit is covered with a large area of copper layer.
As shown in fig. 2 and fig. 3, fig. 2 is a top circuit diagram of a circuit board of a broadband unequal divide-by-three power divider according to an exemplary embodiment, and fig. 3 is a bottom circuit diagram of a circuit board of a broadband unequal divide-by-three power divider according to an exemplary embodiment.
In the embodiment of the invention, the circuit board structure comprises the following components from top to bottom in sequence: a top copper-clad layer, a dielectric layer and a bottom copper-clad layer; the circuit comprises: the top layer circuit penetrates through the dielectric layer through the copper-sinking hole and is connected with the bottom layer circuit; the large-area grounding circuit on the top layer of the circuit board is also connected with the large-area grounding circuit on the bottom layer by penetrating the dielectric layer through the copper-plated hole.
It should be noted that, the broadband unequal-division-one-into-three power divider of the invention reduces the complexity of the feed network because the grounding coplanar waveguide circuit is used for connecting the three output ports; and the bottom layer is also provided with a large-area metal layer, so that two sides of the top circuit of the grounded coplanar waveguide are connected with the ground, the grounding inconsistency is eliminated, the frequency band can be effectively widened, and the port matching degree and the isolation degree are improved.
Because a coplanar waveguide circuit is used (the coplanar waveguide circuit comprises a conventional coplanar waveguide circuit and a grounding coplanar waveguide circuit, and the conventional coplanar waveguide circuit is preferably used), the circuit space coupling is weakened, so that the isolation of an output port of the actual circuit is improved by about 3 dB; and the good in-band flatness in the wide frequency band range of the conventional coplanar waveguide circuit is used, and the in-band fluctuation is reduced by 0.2dB. The front and back surfaces of the circuit board are coated with copper in large areas, so that the mechanical strength and the temperature performance of the product are improved.
In the embodiment, the transmission line width of the conventional coplanar waveguide circuit is within the range of 0.8-2.5 mm, the impedance of the transmission line circuit can be changed by changing the width and the groove width of the conventional coplanar waveguide circuit, the circuit design is simplified, the reflection loss and the loss of a transmission line conductor are reduced by adopting a wider transmission line, and the reliability of the circuit and a circuit board is improved; the conventional coplanar waveguide and grounding coplanar waveguide hybrid circuit simplifies the circuit layout; in addition, the connection between the conventional coplanar waveguide circuit and the grounding coplanar waveguide circuit realizes the transition from the grounding coplanar waveguide to the conventional coplanar waveguide circuit through the distance from the grounding surface of the coplanar waveguide to the transmission line, and reduces the reflection loss.
For example, the present embodiment provides a broadband unequal-division-one-division-three-power divider, which has a working frequency of 0.8GHz to 3.2GHz, a power ratio of three output ports is 2: the dielectric constant is 2.65, the loss tangent value is 0.0014@10GHz, the dielectric thickness is 0.765mm, and the copper-clad thickness is 0.017mm. A simulation schematic diagram is obtained according to the structural principle, the center frequency, the bandwidth and the frequency range of the power divider and is shown in fig. 4, a simulation result is further obtained, and finally performance results of the one-to-three power divider are obtained and are shown in fig. 5 to fig. 8.
TABLE 1
In this embodiment, the transmission line circuit uses a conventional coplanar waveguide transmission line circuit at an impedance value in the range of 65 to 165 ohms, and uses a grounded coplanar waveguide transmission line circuit at an impedance value in the range of 47 to 65 ohms.
Fig. 5 is a graph showing simulation results of transmission losses of a broadband unequal divide-by-three power divider according to an exemplary embodiment, and the transmission losses S21-S41 (including no power distribution) are about-0.3 dB at operating frequencies of 0.8 to 3.2 GHz.
Fig. 6 is a diagram illustrating a simulation result of the isolation of the output port of the broadband unequal-division-one-three-division power divider according to an exemplary embodiment, where the isolation of the output port between adjacent ports and non-adjacent ports is greater than 28dB at an operating frequency of 0.8 to 3.2 GHz.
Fig. 7 is a graph showing simulation results of port reflection of the broadband unequal-division-three-division power divider according to an exemplary embodiment, wherein the reflection coefficient S11-S44 of each port is about-25 dB at the operating frequency of 0.8-3.2 GHz.
Fig. 8 is a simulation result diagram of transmission phases of the broadband unequal-division-three-division power divider according to an exemplary embodiment, where the transmission phases of the output ports are the same and do not change much at the operating frequency of 0.8 to 3.2 GHz.
Fig. 9 is a diagram illustrating a simulation result of a voltage across a fourth resistor of a broadband unequal-division-three-division power divider according to an exemplary embodiment. When the working frequency is 0.8-3.2 GHz, the square ratio of the voltage of the output end is 1.4955, and the voltage difference of the last resistor is 0.0677 (normalization).
The invention provides a broadband unequal division one-into-three power divider, which comprises: the power divider comprises an input port, a power divider main body, a circuit board, three output ports and a power divider shell, wherein the circuit board is arranged on the power divider main body; the circuit board is provided with an input circuit, three N branch line circuits with unequal impedances, an isolation resistor arranged at the output end of each transmission line circuit in the three branch line circuits, and three output circuits, wherein N is a positive integer; the input port is connected with one end of the input circuit, and the other end of the input circuit is connected with the three branches with unequal N impedances; the three paths of branch line circuits with unequal impedances are respectively connected with the corresponding three paths of output circuits, the three paths of output circuits are respectively correspondingly connected with the first output port, the second output port and the third output port, and the output powers of the three output ports are unequal, wherein the output power of the middle second path of branch line circuit with unequal impedances is set to be larger than the output powers of the other two paths of branch line circuits with unequal impedances; the three paths of N-section impedance unequal branch line circuits are provided with N sections of transmission line circuits, and when the impedance value of the transmission line circuits is greater than or equal to a set impedance value, the transmission line circuits use a coplanar waveguide circuit; when the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounded coplanar waveguide circuit; the coplanar waveguide circuit and the grounding coplanar waveguide circuit adjust the output amplitude value and the output phase value of each transmission line circuit by changing three variables of the line width, the line length and the groove width of the transmission line circuit. Therefore, the broadband unequal-division-one-division-three-power divider simplifies the circuit design by combining the coplanar waveguide circuit and the grounded coplanar waveguide circuit, solves the problem that the broadband unequal-division-one-division-three-power divider has unequal design amplitude and the same phase, reduces the transmission loss, improves the isolation degree of the output port and the matching degree of each port, and improves the output phase consistency.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. A broadband unequal-division-one-into-three power divider is characterized by comprising: the power divider comprises an input port, a power divider main body, a circuit board, three output ports and a power divider shell, wherein the circuit board is arranged on the power divider main body; the circuit board is provided with an input circuit, three paths of N branch line circuits with unequal impedance, an isolation resistor arranged at the output end of each transmission line circuit in the three paths of branch line circuits, and three paths of output circuits, wherein N is a positive integer;
the input port is connected with one end of the input circuit, and the other end of the input circuit is connected with the three branches with unequal N-section impedances;
the three branches with unequal impedances are respectively connected with the corresponding three output circuits, the three output circuits are respectively correspondingly connected with the first output port, the second output port and the third output port, and the output powers of the three output ports are unequal, wherein the output power of the middle second branch with unequal impedances is set to be larger than the output powers of the other two branches with unequal impedances;
when the impedance value of the transmission line circuit is greater than or equal to a set impedance value, the transmission line circuit uses a coplanar waveguide circuit; when the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounded coplanar waveguide circuit; the coplanar waveguide circuit and the grounding coplanar waveguide circuit adjust the output amplitude value and the output phase value of each transmission line circuit by changing three variables of the line width, the line length and the groove width of the transmission line circuit.
2. The broadband unequal divide-by-three power divider according to claim 1, wherein one end of the input circuit is connected to the input port, the other end of the input circuit is connected to the three N-section unequal impedance branch line circuits, the impedance of the input circuit is 50 ohms, the length of the input circuit ranges from 2.5 mm to 3mm, and the input circuit uses a grounded coplanar waveguide circuit.
3. The broadband unequal division-one-into-three power divider according to claim 1, wherein the number of nodes N of the three-way N-node impedance unequal branch line circuit is calculated and determined according to the bandwidth, the port standing wave ratio and the output port isolation; wherein N is a positive integer.
4. The broadband unequal divide-by-three power divider of claim 1, wherein determining the impedance value of the three-way N-segment impedance unequal branch line circuit according to the output power ratio of the three-way N-segment impedance unequal branch line circuit comprises: combining two paths with lower power in the three paths of the N-section impedance unequal branch line circuits to obtain a combined circuit, and calculating the input impedance and the output impedance of each path of the N-section impedance unequal branch line circuit according to the ratio of the output power of the combined circuit to the output power of the other path of the N-section impedance unequal branch line circuit;
the length of each section of the transmission line circuit is one quarter wavelength of the center frequency.
5. The broadband unequal divide-by-three power divider according to claim 1, wherein N transmission line circuits are disposed in the three branch line circuits, an isolation resistor is disposed at an output end of each transmission line circuit, the isolation resistors disposed at the output ends of the three same transmission line circuits have different resistances, a vertical interconnection circuit is disposed at a middle position of each transmission line circuit, the vertical interconnection circuit passes through a dielectric layer of a circuit board and is connected to one end of the isolation resistor located in a bottom layer circuit, and the other end of the isolation resistor is connected to a common point.
6. The broadband unequal divide-by-three power divider according to claim 1, wherein one end of the three-way output circuit is connected to the output end of the three-way N-segment unequal impedance branch line circuit, and the other end is connected to the three output ports; the impedance of the three output circuits is unequal, the length of the three output circuits is a quarter wavelength of the central frequency, the three output circuits are respectively connected with the first output port, the second output port and the third output port, and when the impedance value of the transmission line circuit is larger than or equal to a set impedance value, the transmission line circuit uses a coplanar waveguide circuit; when the impedance value of the transmission line circuit is smaller than the set impedance value, the transmission line circuit uses a grounded coplanar waveguide circuit;
and when the standing-wave ratio of the output port is greater than a preset threshold value, increasing the number of nodes of the three-way output circuit, wherein the length of the three-way M-node output circuit is the product of a quarter wavelength of the central frequency and the number of nodes M, wherein M is a positive integer.
7. The broadband unequal divide-by-three power divider according to claim 1, wherein voltages at output ends of each branch line circuit in the three N-branch unequal impedance branch line circuits are equal or nearly equal, impedances and output powers at output ends of the three N-branch unequal impedance branch line circuits are unequal, and voltage differences at both ends of all the isolation resistors are zero or nearly zero.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117080707A (en) * | 2023-10-17 | 2023-11-17 | 成都世源频控技术股份有限公司 | Broadband high-frequency integrated high-amplitude phase consistency one-to-eight unequal power divider |
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| CN114156622A (en) * | 2021-11-30 | 2022-03-08 | 郝艺益 | Broadband low-loss one-to-six power divider and design method thereof |
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| CN111834728A (en) * | 2020-08-13 | 2020-10-27 | 郝艺益 | Broadband unequal-dividing power divider of coplanar waveguide circuit |
| CN113241511A (en) * | 2021-06-04 | 2021-08-10 | 北京宏宇泰科技发展有限公司 | Broadband one-to-five microstrip circuit |
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