CN115425940B - Construction method of microstrip multiplexer with continuous passband, microstrip multiplexer and device - Google Patents
Construction method of microstrip multiplexer with continuous passband, microstrip multiplexer and device Download PDFInfo
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Abstract
The application provides a construction method of a microstrip multiplexer with continuous passband, the microstrip multiplexer and a device, wherein the method comprises the following steps: generating LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the complementary filter principle to construct and obtain a multiplexer LC circuit; respectively converting LC circuits corresponding to a low-pass filter and a high-pass filter in the multiplexer LC circuits into element combination structures based on microstrip lines so as to obtain corresponding microstrip low-pass filters and microstrip high-pass filters; and combining the microstrip low-pass filter and the microstrip high-pass filter to construct the microstrip multiplexer with continuous passband. The construction of the microstrip multiplexer with continuous passband can be realized, the structural complexity of the microstrip multiplexer obtained by construction can be effectively reduced, the integration level of the microstrip multiplexer with continuous passband can be improved, the application range of the microstrip multiplexer with continuous passband obtained by construction can be wider, and the loss is lower.
Description
Technical Field
The application relates to the technical field of multiplexers, in particular to a construction method of a microstrip multiplexer with continuous passband, a microstrip multiplexer and a device.
Background
The multiplexer has the capability of separating or synthesizing signals with different frequencies, so that the utilization rate of spectrum resources can be improved. The multiplexer with continuous pass band has been widely studied in microwave frequency band, and has a relatively complete design principle in circuit level, namely, separation or synthesis of signals with different frequencies is realized based on complementary low-pass and high-pass filters.
At present, the suspended microstrip line can be used for constructing a capacitive element in the high-pass filter through overlapping of the front and back circuits, so as to realize a complementary filter. For example, the prior art adopts a suspended microstrip line to realize a duplexer with continuous pass bands of 0-40GHz and 40-80 GHz. The multiplexer for realizing passband continuity based on the microstrip line is also studied, and the prior art realizes a four-channel passband continuity multiplexer of 1-9GHz based on the microstrip line. It is also designed using the principle of a complementary filter, wherein the capacitive element in the high pass filter is a lumped capacitance.
That is, in the suspended microstrip multiplexer with continuous passband, the suspended microstrip needs to introduce an additional metal cavity structure, so that the overall size of the device is larger, the complexity is higher, and the suspended microstrip multiplexer is not easy to integrate with an MMIC circuit in practical application; for the study of the microstrip multiplexer with continuous passband, the capacitive element in the high-pass filter adopts a lumped capacitive structure, and the quality factor is low, so that the high-pass filter is not suitable for high-power application. In addition, if the frequency rises to millimeter wave and terahertz frequency bands, the lumped capacitor can not be used any more, and an actual microstrip line structure is needed to construct a high-pass filter; at present, the researches on multiplexers with continuous pass bands are concentrated in microwave and millimeter wave frequency bands, and the related researches on the principle and design method for constructing the multiplexers in higher frequency bands are insufficient.
Disclosure of Invention
In view of this, embodiments of the present application provide a method for constructing a microstrip multiplexer with continuous passband, a microstrip multiplexer, and an apparatus, so as to obviate or improve one or more drawbacks in the prior art.
One aspect of the present application provides a method for constructing a microstrip multiplexer with continuous passband, including:
generating LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the complementary filter principle to construct and obtain a multiplexer LC circuit;
respectively converting LC circuits corresponding to a low-pass filter and a high-pass filter in the multiplexer LC circuit into element combination structures based on microstrip lines so as to obtain a corresponding microstrip low-pass filter and microstrip high-pass filter;
and combining the microstrip low-pass filter and the microstrip high-pass filter to construct the microstrip multiplexer with continuous passband.
In some embodiments of the present application, the generating LC circuits corresponding to the low-pass filter and the high-pass filter based on the complementary filter principle to construct a multiplexer LC circuit includes:
obtaining LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the Chebyshev complementary filter circuit;
Converting the LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on a preset characteristic impedance value of an input port and each cut-off frequency;
and cascading the converted LC circuits corresponding to the low-pass filter and the high-pass filter respectively to obtain corresponding multiplexer LC circuits.
In some embodiments of the present application, the converting LC circuits corresponding to the low-pass filter and the high-pass filter in the multiplexer LC circuit into the microstrip line-based element combination structures respectively, so as to obtain the corresponding microstrip low-pass filter and microstrip high-pass filter includes:
each capacitor connected in series in the LC circuit corresponding to the high-pass filter is replaced by an interdigital capacitor, and each inductor connected with the ground in parallel in the LC circuit corresponding to the high-pass filter is replaced by a microstrip short-circuit branch so as to obtain a corresponding microstrip high-pass filter;
and respectively replacing each inductor connected in series in the LC circuit corresponding to the low-pass filter with a high-impedance microstrip line, and respectively replacing each capacitor connected with the ground in parallel in the LC circuit corresponding to the low-pass filter with a low-impedance microstrip line to obtain the corresponding microstrip low-pass filter.
In some embodiments of the present application, after the constructing the microstrip multiplexer with continuous passband, the method further includes:
and performing simulation optimization on the constructed microstrip multiplexer with continuous pass bands in full-wave simulation software.
In another aspect, the application provides a microstrip multiplexer with continuous passband, which is constructed by the construction method of the microstrip multiplexer with continuous passband.
In some embodiments of the present application, the passband-continuous microstrip multiplexer includes: a microstrip triplexer with continuous passband;
the microstrip triplexer includes: a first low pass filter, a second low pass filter, a first high pass filter, and a second high pass filter;
a first signal input port is arranged on the primary side of the first low-pass filter;
a second signal input port is arranged on the primary side of the first high-pass filter;
a third signal input port is arranged on the primary side of the second high-pass filter;
the secondary side of the second low-pass filter is provided with a signal output port;
the first low-pass filter and the second low-pass filter are connected with each other, the secondary side of the first high-pass filter is connected between the secondary side of the first low-pass filter and the primary side of the second low-pass filter, and the secondary side of the second high-pass filter is connected between the secondary side of the second low-pass filter and the signal output port.
In some embodiments of the present application, the working frequency band of the first signal input port is: 110-170GHz;
the working frequency band of the second signal input port is as follows: 170GHz-220GHz;
the working frequency band of the third signal input port is as follows: 220GHz-325GHz;
the working frequency band of the signal output port is as follows: 110GHz-325GHz.
Another aspect of the present application provides an apparatus for constructing a microstrip multiplexer with continuous passband, including:
the circuit generation module is used for generating LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the complementary filter principle so as to construct and obtain a multiplexer LC circuit;
the element conversion module is used for respectively converting the LC circuits corresponding to the low-pass filter and the high-pass filter in the multiplexer LC circuit into element combination structures based on microstrip lines so as to obtain the corresponding microstrip low-pass filter and microstrip high-pass filter;
and the multiplexer construction module is used for combining the microstrip low-pass filter and the microstrip high-pass filter to construct the microstrip multiplexer with continuous passband.
In another aspect, the present application provides an electronic device, where the electronic device is disposed on a train, and includes a memory, a processor, and a computer program stored on the memory and capable of running on the processor, where the processor implements the method for constructing a microstrip multiplexer with continuous passband when the processor executes the computer program.
Another aspect of the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of constructing a microstrip multiplexer having a continuous passband as described.
According to the construction method of the microstrip multiplexer with continuous passband, the LC circuits corresponding to the low-pass filter and the high-pass filter are generated based on the complementary filter principle, so that the multiplexer LC circuit is constructed; respectively converting LC circuits corresponding to a low-pass filter and a high-pass filter in the multiplexer LC circuit into element combination structures based on microstrip lines so as to obtain a corresponding microstrip low-pass filter and microstrip high-pass filter; combining the microstrip low-pass filter and the microstrip high-pass filter to construct a microstrip multiplexer with continuous passband; the construction of the microstrip multiplexer with continuous passband can be realized, and the construction process is reliable and effective; compared with a lumped capacitance type high-pass filter, the high-pass filter of the application adopts an inductance and capacitance structure based on the microstrip line, so that the quality factor of the high-pass filter can be effectively improved, the high-pass filter can be suitable for high-power application, and the application universality is further improved; compared with a multiplexer in a suspended microstrip line form, the method can effectively reduce the structural complexity of the constructed microstrip multiplexer, avoid excessively increasing the whole size of the device, and is easy to integrate with MMIC circuits and the like in practical application; meanwhile, the construction of the passband continuous multiplexer applicable to higher working frequency bands such as terahertz frequency bands is supported, and the loss is low.
Additional advantages, objects, and features of the application will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present application are not limited to the above-detailed description, and that the above and other objects that can be achieved with the present application will be more clearly understood from the following detailed description.
Drawings
The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. Corresponding parts in the drawings may be exaggerated, i.e. made larger relative to other parts in an exemplary device actually manufactured according to the present application, for convenience in showing and describing some parts of the present application. In the drawings:
fig. 1 is a general flow chart of a method for constructing a microstrip multiplexer with continuous passband in an embodiment of the present application.
Fig. 2 is a schematic flow chart of a method for constructing a microstrip multiplexer with continuous passband according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a logic architecture of a passband-sequential multiplexer according to the present application.
Fig. 4 is a schematic diagram of a microstrip triplexer LC circuit with a 110-325GHz passband continuity provided herein.
Fig. 5 is a schematic diagram of a microstrip triplexer model with a continuous passband of 110-325GHz provided in the present application.
Fig. 6 is a schematic structural diagram of a device for constructing a microstrip multiplexer with continuous passband according to another embodiment of the present application.
Fig. 7 is a schematic diagram showing conversion comparison between a high-pass filter LC circuit and a low-pass filter LC circuit provided in an application example of the present application and a microstrip line structure, respectively.
Fig. 8 is a schematic diagram of transmission coefficients of a microstrip triplexer with a continuous passband of 110-325GHz provided in an application example of the present application.
Fig. 9 is a schematic diagram of the reflection coefficient of the microstrip triplexer with a continuous passband of 110-325GHz provided in the application example of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the embodiments and the accompanying drawings. The exemplary embodiments of the present application and their descriptions are used herein to explain the present application, but are not intended to be limiting of the present application.
It should be noted here that, in order to avoid obscuring the present application due to unnecessary details, only structures and/or processing steps closely related to the solution according to the present application are shown in the drawings, while other details not greatly related to the present application are omitted.
It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
It is also noted herein that the term "coupled" may refer to not only a direct connection, but also an indirect connection in which an intermediate is present, unless otherwise specified.
Hereinafter, embodiments of the present application will be described with reference to the drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.
The multiplexer in one or more embodiments of the present application may select a duplexer to a demultiplexer according to actual needs, and may specifically select the multiplexer according to actual application needs.
When the multiplexer is connected with the antenna, the receiver and the like, different channels can be ensured to work simultaneously and are not interfered with each other. When the multiplexer is applied to communication, different frequency bands can be used for transmitting data at the same time, so that the communication rate is improved.
Multiplexers can be classified into passband discontinuity and passband continuity. The pass bands of the two pass bands have no intersection, so that the isolation between different pass bands is easy to ensure, and the other pass band can generate a cross frequency between adjacent pass bands, and half of energy of the two pass bands enters into the other pass band at the cross frequency, so that the isolation between the two pass bands is reduced, and therefore, the multiplexer with continuous pass bands has larger design difficulty.
The multiplexer with continuous pass band has been widely studied in microwave frequency band, and has a relatively complete design principle in circuit level, namely, separation or synthesis of signals with different frequencies is realized based on complementary low-pass and high-pass filters. The suspended microstrip line can be used for constructing a capacitive element in the high-pass filter through overlapping of the front and back circuits, so that a complementary filter is realized. For example, the prior art adopts a suspended microstrip line to realize a duplexer with continuous pass bands of 0-40GHz and 40-80 GHz.
The multiplexer for realizing passband continuity based on the microstrip line is also studied, and the prior art realizes a four-channel passband continuity multiplexer of 1-9GHz based on the microstrip line. It is also designed using the principle of a complementary filter, but the capacitive element in the high-pass filter is a lumped capacitance.
However, the conventional above-described method has the following problems:
(1) in a suspended microstrip line multiplexer with continuous pass bands, the suspended microstrip line needs to be introduced with an additional metal cavity structure, so that the whole size of the device is larger, the complexity is higher, and the suspended microstrip line is not easy to integrate with an MMIC circuit in practical application. It is understood that MMIC (Monolithic Microwave Integrated Circuit) refers to monolithic microwave integrated circuits.
(2) For the study of the microstrip multiplexer with continuous passband, the capacitive element in the high-pass filter adopts a lumped capacitive structure, and the quality factor is low, so that the high-pass filter is not suitable for high-power application. In addition, if the frequency rises to the millimeter wave and terahertz frequency range, the lumped capacitor can no longer be used, and an actual microstrip line structure is needed to construct a high-pass filter.
(3) At present, researches on multiplexers with continuous pass bands are concentrated in microwave and millimeter wave frequency bands, and related researches on the principle and design method for constructing the multiplexers in terahertz frequency bands with higher frequencies are insufficient.
Based on the above, in order to solve the problems that the suspended microstrip line multiplexer has larger size and higher complexity, the high-pass filter in the form of lumped capacitor is not suitable for high-power application, the existing passband continuous multiplexer is not suitable for higher working frequency band, and the like, the embodiment of the application provides a construction method of the passband continuous microstrip multiplexer, a construction device of the passband continuous microstrip multiplexer, electronic equipment, a computer readable storage medium and the like, so that the construction of the passband continuous microstrip multiplexer can be realized, the structural complexity of the constructed microstrip multiplexer can be effectively reduced, the integration level of the passband continuous microstrip multiplexer can be improved, the application range of the passband continuous microstrip multiplexer working frequency band obtained by construction can be wider, and the loss is lower.
Based on this, the embodiment of the application provides a method for constructing a microstrip multiplexer with continuous passband, referring to fig. 1, the method for constructing a microstrip multiplexer with continuous passband specifically includes the following steps:
step 100: and generating LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the complementary filter principle to construct and obtain a multiplexer LC circuit.
It will be appreciated that LC circuits corresponding to the low-pass filter and the high-pass filter, respectively, may be derived based on circuit prototypes of chebyshev complementary filters, which LC circuits are combined to form a multiplexer LC circuit. It can be understood that the circuit prototype of the chebyshev complementary filter is the existing principle, and the specific way of obtaining the LC circuit corresponding to each of the low-pass filter and the high-pass filter based on the prototype is as follows: and transforming the LC circuit prototype according to the characteristic impedance and the cut-off frequency of the input port to obtain the LC circuit corresponding to the low-pass filter and the high-pass filter.
Step 200: and respectively converting the LC circuits corresponding to the low-pass filter and the high-pass filter in the multiplexer LC circuit into element combination structures based on microstrip lines so as to obtain the corresponding microstrip low-pass filter and microstrip high-pass filter.
In step 200, the circuit needs to be subjected to element structure transformation, that is, the element identifier in the circuit is subjected to design of a physical element model, and the element identifier in the LC circuit at least comprises identifiers such as inductance L and capacitance C.
It can be understood that the LC circuits corresponding to the low-pass filter and the high-pass filter in the multiplexer LC circuit are respectively converted into the element combination structures based on the microstrip line, so as to obtain the corresponding microstrip low-pass filter and microstrip high-pass filter, which specifically means that: converting an LC circuit corresponding to a low-pass filter in the multiplexer LC circuit into an element combination structure based on microstrip lines to obtain a corresponding microstrip low-pass filter; and converting an LC circuit corresponding to the high-pass filter in the multiplexer LC circuit into an element combination structure based on the microstrip line to obtain a corresponding microstrip high-pass filter.
Step 300: and combining the microstrip low-pass filter and the microstrip high-pass filter to construct the microstrip multiplexer with continuous passband.
It can be appreciated that in one or more embodiments of the present application, the microstrip multiplexer with continuous passband constructed in step 300 may be a simulation model constructed to obtain a microstrip multiplexer with continuous passband, and the corresponding construction method of the microstrip multiplexer with continuous passband may be designed through an electronic device. The automatic construction process of the microstrip multiplexer with continuous pass band can also be realized according to a pre-constructed software program.
Then, in the practical application process, the microstrip multiplexer with continuous passband constructed according to step 300 can be used to produce a corresponding multiplexer entity product.
As can be seen from the above description, the method for constructing a microstrip multiplexer with continuous passband provided by the embodiments of the present application can implement the construction of a microstrip multiplexer with continuous passband, and the construction process is reliable and effective; compared with a lumped capacitance type high-pass filter, the high-pass filter of the application adopts an inductance and capacitance structure based on the microstrip line, so that the quality factor of the high-pass filter can be effectively improved, the high-pass filter can be suitable for high-power application, and the application universality is further improved; compared with a multiplexer in a suspended microstrip line form, the method can effectively reduce the structural complexity of the constructed microstrip multiplexer, avoid excessively increasing the whole size of the device, and is easy to integrate with MMIC circuits and the like in practical application; meanwhile, the construction of the terahertz frequency band passband continuous multiplexer is supported, and the loss is low.
In order to further reduce the structural complexity of the microstrip multiplexer obtained by construction, in the method for constructing a microstrip multiplexer with continuous passband provided in the embodiment of the present application, referring to fig. 2, step 100 in the method for constructing a microstrip multiplexer with continuous passband further specifically includes the following contents:
Step 110: and obtaining LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the Chebyshev complementary filter circuit.
Step 120: and converting the LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the preset characteristic impedance value of the input port and each cut-off frequency.
Step 130: and cascading the converted LC circuits corresponding to the low-pass filter and the high-pass filter respectively to obtain corresponding multiplexer LC circuits.
Specifically, n pass bands of the multiplexer are (f) 0 ,f 1 ),(f 1 ,f 2 ),(f 2 ,f 3 )……(f n-1 ,f n ) (left parameter in parentheses is lower cut-off frequency, right parameter is upper cut-off frequency, f 0 <f 1 <f 2 <……<f n ). First, based on a circuit prototype of a chebyshev complementary filter, an LC circuit of a low-pass filter and an LC circuit of a high-pass filter are obtained. Then, the low-pass filter and the high-pass filter are subjected to impedance and frequency scaling, and are converted into the input port with characteristic impedance of 50 ohms and cut-off frequency of f respectively 1 ,f 2 ,f 3 ……f n-1 Low pass and high pass filters of (a). Finally, go low-pass, highThe pass filters are correspondingly cascaded to form an LC circuit of the whole multiplexer. Referring to fig. 3, n pass bands (f 0 ,f 1 ),(f 1 ,f 2 ),(f 2 ,f 3 )……(f n-1 ,f n ) The signal of (2) is input to a multiplexer and output (f) 0 ,f n ) A signal.
As can be seen from the above description, the method for constructing a microstrip multiplexer with continuous passband provided by the embodiments of the present application can effectively ensure the reliability and effectiveness of the application of the constructed multiplexer LC circuit, further reduce the structural complexity of the constructed microstrip multiplexer, avoid excessively increasing the overall size of the device, and facilitate integration with MMIC circuits in practical applications.
In order to further improve the quality factor of the high-pass filter, in the method for constructing a microstrip multiplexer with continuous passband provided in the embodiment of the present application, referring to fig. 2, step 200 in the method for constructing a microstrip multiplexer with continuous passband specifically includes the following steps:
step 210: and respectively replacing each capacitor connected in series in the LC circuit corresponding to the high-pass filter with an interdigital capacitor, and respectively replacing each inductor connected with the ground in parallel in the LC circuit corresponding to the high-pass filter with a microstrip short-circuit branch so as to obtain the corresponding microstrip high-pass filter.
Step 220: and respectively replacing each inductor connected in series in the LC circuit corresponding to the low-pass filter with a high-impedance microstrip line, and respectively replacing each capacitor connected with the ground in parallel in the LC circuit corresponding to the low-pass filter with a low-impedance microstrip line to obtain the corresponding microstrip low-pass filter.
Specifically, the high-pass filter is composed of a series capacitor and a parallel connection inductance. The series capacitance may be approximated by an interdigital capacitance and the coupled ground inductance may be approximated by a short circuit stub. The low-pass filter is composed of a series inductor and a parallel connection capacitor. The series inductance may be approximately replaced by a section of high impedance microstrip line and the shunt capacitance may be approximately replaced by a section of low impedance line. It can be understood that the interdigital capacitor is a structure formed by overlapping a plurality of microstrip lines with open terminals and certain gaps; the short circuit branch is a microstrip line with a certain length and a short circuit terminal. The end of the microstrip line is in a short circuit state by punching a metal through hole at the end.
As can be seen from the above description, the method for constructing a microstrip multiplexer with continuous passband provided by the embodiments of the present application can further improve the quality factor of the high-pass filter, so that the high-pass filter can be suitable for high-power application, and further improve the application universality.
In order to further improve the performance of the multiplexer, in the method for constructing a microstrip multiplexer with continuous passband provided in the embodiment of the present application, referring to fig. 2, step 300 in the method for constructing a microstrip multiplexer with continuous passband further specifically includes the following steps:
step 400: and performing simulation optimization on the constructed microstrip multiplexer with continuous pass bands in full-wave simulation software.
Specifically, the low-pass and high-pass filters converted into microstrip lines are combined to obtain an overall multiplexer structure. Because the microstrip line is used for replacing the LC circuit in an approximately equivalent way, the situation that the microstrip line cannot be completely equivalent can occur at high frequency, the whole optimization of the multiplexer in the form of the microstrip line in full-wave simulation software is needed, the size of each part is finely adjusted, and the performance of the multiplexer is improved.
Based on the embodiment of the method for constructing the microstrip multiplexer with continuous passband, the application also provides an embodiment of the microstrip multiplexer with continuous passband, which is constructed by the method for constructing the microstrip multiplexer with continuous passband.
Compared with a multiplexer in a suspended microstrip line form, the microstrip multiplexer with continuous passband provided by the embodiment of the application has low structural complexity, is easy to integrate with an MMIC circuit, and has higher quality factor and wider application range compared with a high-pass filter in a lumped capacitance form; the construction of the terahertz frequency band passband continuous multiplexer is also supported, and the loss is lower.
In order to further improve the application reliability of the microstrip multiplexer with continuous passband, in the embodiment of the microstrip multiplexer with continuous passband provided in the present application, the microstrip multiplexer with continuous passband further specifically includes the following contents:
a microstrip triplexer with continuous passband;
the microstrip triplexer includes: a first low pass filter, a second low pass filter, a first high pass filter, and a second high pass filter;
a first signal input port is arranged on the primary side of the first low-pass filter;
a second signal input port is arranged on the primary side of the first high-pass filter;
a third signal input port is arranged on the primary side of the second high-pass filter;
the secondary side of the second low-pass filter is provided with a signal output port;
The first low-pass filter and the second low-pass filter are connected with each other, the secondary side of the first high-pass filter is connected between the secondary side of the first low-pass filter and the primary side of the second low-pass filter, and the secondary side of the second high-pass filter is connected between the secondary side of the second low-pass filter and the signal output port.
Specifically, referring to fig. 4, an LC circuit of the triplexer is first constructed according to the embodiment of the method for constructing a microstrip multiplexer with continuous passband, and then the LC circuit of the triplexer is transformed into a microstrip triplexer model as shown in fig. 5 based on the element combination structure of the microstrip line.
In fig. 4, a first low-pass filter D1, a second low-pass filter D2, a first high-pass filter G1, and a second high-pass filter G2 are included, and further, a first signal input port 1, a second signal input port 2, a third signal input port 3, and a signal output port 4 are included, in fig. 4, C represents a capacitance, L represents an inductance, and Term represents an input/output port; num represents an input/output port number; z represents the port characteristic impedance; r represents resistances, which are all 0; the number following each letter is used to distinguish the component represented by the letter, e.g., C1 and C2 represent two different capacitances, respectively.
In fig. 5, a microstrip-line-based element combination structure WD1 of a first low-pass filter, a microstrip-line-based element combination structure WD2 of a second low-pass filter, a microstrip-line-based element combination structure WG1 of a first high-pass filter, and a microstrip-line-based element combination structure WG2 of a second high-pass filter are included, and an amplification structure of the microstrip-line-based element combination structure WG2 of the second high-pass filter is shown in fig. 4.
As the microstrip triplexer works in a terahertz frequency band with higher frequency, a certain frequency offset and loss increase occurs, but most of the frequency loss in the passband is lower. Based on the above, the application also provides a microstrip triplexer with a continuous 110-325GHz passband, which has lower loss in the terahertz frequency band, in particular:
the working frequency band of the first signal input port is as follows: 110-170GHz;
the working frequency band of the second signal input port is as follows: 170GHz-220GHz;
the working frequency band of the third signal input port is as follows: 220GHz-325GHz;
the working frequency band of the signal output port is as follows: 110GHz-325GHz.
From the software aspect, the present application further provides a device for implementing the passband-continuous microstrip multiplexer in all or part of the method for implementing the passband-continuous microstrip multiplexer, referring to fig. 6, where the device for implementing the passband-continuous microstrip multiplexer specifically includes the following contents:
The circuit generating module 10 is configured to generate LC circuits corresponding to the low-pass filter and the high-pass filter based on the complementary filter principle, so as to construct and obtain a multiplexer LC circuit;
the element conversion module 20 is configured to convert LC circuits corresponding to the low-pass filter and the high-pass filter in the multiplexer LC circuit into microstrip line-based element combination structures, respectively, so as to obtain a microstrip low-pass filter and a microstrip high-pass filter;
the multiplexer construction module 30 is configured to combine the microstrip low-pass filter and the microstrip high-pass filter to construct a microstrip multiplexer with continuous passband.
The embodiment of the device for constructing the microstrip multiplexer with continuous passband provided in the application may be specifically used to execute the processing flow of the embodiment of the method for constructing the microstrip multiplexer with continuous passband in the above embodiment, and the functions thereof will not be described herein again, and reference may be made to the detailed description of the embodiment of the method for constructing the microstrip multiplexer with continuous passband.
The construction device of the microstrip multiplexer with continuous pass band can execute the construction part of the microstrip multiplexer with continuous pass band in a server, and in another practical application situation, all the operations can be completed in the client device. Specifically, the selection may be made according to the processing capability of the client device, and restrictions of the use scenario of the user. The present application is not limited in this regard. If all operations are performed in the client device, the client device may further include a processor for performing the specific processing of the construction of the microstrip multiplexer with continuous pass band.
The client device may have a communication module (i.e. a communication unit) and may be connected to a remote server in a communication manner, so as to implement data transmission with the server. The server may include a server on the side of the task scheduling center, and in other implementations may include a server of an intermediate platform, such as a server of a third party server platform having a communication link with the task scheduling center server. The server may include a single computer device, a server cluster formed by a plurality of servers, or a server structure of a distributed device.
Any suitable network protocol may be used for communication between the server and the client device, including those not yet developed at the filing date of this application. The network protocols may include, for example, TCP/IP protocol, UDP/IP protocol, HTTP protocol, HTTPS protocol, etc. Of course, the network protocol may also include, for example, RPC protocol (Remote Procedure Call Protocol ), REST protocol (Representational State Transfer, representational state transfer protocol), etc. used above the above-described protocol.
As can be seen from the above description, the device for constructing a microstrip multiplexer with continuous passband provided in the embodiments of the present application can implement the construction of a microstrip multiplexer with continuous passband, and the construction process is reliable and effective; compared with a lumped capacitance type high-pass filter, the high-pass filter of the application adopts an inductance and capacitance structure based on the microstrip line, so that the quality factor of the high-pass filter can be effectively improved, the high-pass filter can be suitable for high-power application, and the application universality is further improved; compared with a multiplexer in a suspended microstrip line form, the method can effectively reduce the structural complexity of the constructed microstrip multiplexer, avoid excessively increasing the whole size of the device, and is easy to integrate with MMIC circuits and the like in practical application; meanwhile, the construction of the terahertz frequency band passband continuous multiplexer is supported, and the loss is low.
The embodiment of the application also provides an electronic device (i.e., an electronic device), which may include a processor, a memory, a receiver, and a transmitter, where the processor is configured to execute the method for constructing the microstrip multiplexer with continuous passband as mentioned in the foregoing embodiment, and the processor and the memory may be connected by a bus or other manners, for example, through a bus connection. The receiver may be connected to the processor, memory, by wire or wirelessly. The electronic device may receive real-time motion data from a sensor in the wireless multimedia sensor network and receive an original video sequence from the video acquisition device.
The processor may be a central processing unit (Central Processing Unit, CPU). The processor may also be any other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof.
The memory, as a non-transitory computer readable storage medium, may be used to store a non-transitory software program, a non-transitory computer executable program, and a module, such as program instructions/modules corresponding to the method for constructing a microstrip multiplexer with continuous passband in the embodiments of the present application. The processor executes various functional applications and data processing of the processor by running non-transitory software programs, instructions and modules stored in the memory, i.e., the method for constructing the microstrip multiplexer with continuous passband in the above method embodiment.
The memory may include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for a function; the storage data area may store data created by the processor, etc. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory may optionally include memory located remotely from the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory and when executed by the processor perform the method of constructing a passband-continuous microstrip multiplexer in an embodiment.
In some embodiments of the present application, the user equipment may include a processor, a memory, and a transceiver unit, where the transceiver unit may include a receiver and a transmitter, and the processor, the memory, the receiver, and the transmitter may be connected by a bus system, the memory storing computer instructions, and the processor executing the computer instructions stored in the memory to control the transceiver unit to transmit and receive signals.
As an implementation manner, the functions of the receiver and the transmitter in the present application may be considered to be implemented by a transceiver circuit or a dedicated chip for transceiver, and the processor may be considered to be implemented by a dedicated processing chip, a processing circuit or a general-purpose chip.
As another implementation manner, a manner of using a general-purpose computer may be considered to implement the server provided in the embodiments of the present application. I.e. program code for implementing the functions of the processor, the receiver and the transmitter are stored in the memory, and the general purpose processor implements the functions of the processor, the receiver and the transmitter by executing the code in the memory.
The embodiments of the present application also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the aforementioned method for constructing a microstrip multiplexer with continuous passband. The computer readable storage medium may be a tangible storage medium such as Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, floppy disks, hard disk, a removable memory disk, a CD-ROM, or any other form of storage medium known in the art.
In order to further explain the scheme, the application also provides a specific application example of the construction method of the microstrip multiplexer with continuous passband, and firstly, the LC circuit of the low-pass filter and the LC circuit of the high-pass filter are designed based on the principle of the complementary filter. And secondly, converting an LC circuit of the low-pass and high-pass wave device into an inductance and capacitance structure based on the microstrip line. And finally, combining the microstrip low-pass filter and the microstrip high-pass filter to form the microstrip multiplexer with continuous pass bands. This method was verified using a triplexer of 110-325GHz as a design example.
The construction method of the microstrip multiplexer with continuous passband provided by the application example specifically comprises the following steps:
the design flow of the microstrip multiplexer with continuous pass band is divided into three steps:
complementary low-pass, high-pass filter LC circuits are designed.
The n pass bands of the multiplexer are respectively (f) 0 ,f 1 ),(f 1 ,f 2 ),(f 2 ,f 3 )……(f n-1 ,f n ) (left parameter in parentheses is lower cut-off frequency, right parameter is upper cut-off frequency, f 0 <f 1 <f 2 <……<f n ). First, based on a circuit prototype of a chebyshev complementary filter, an LC circuit of a low-pass, high-pass filter is obtained. Secondly, the low-pass and high-pass filters are blockedThe impedance and frequency are scaled to be converted to an input port characteristic impedance of 50 ohms and cut-off frequencies of f 1 ,f 2 ,f 3 ……f n-1 Low pass and high pass filters of (a). And finally, correspondingly cascading the low-pass filter and the high-pass filter to form an LC circuit of the integral multiplexer. As shown in fig. 3, n pass bands (f 0 ,f 1 ),(f 1 ,f 2 ),(f 2 ,f 3 )……(f n-1 ,f n ) The signal of (2) is input to a multiplexer and output (f) 0 ,f n ) A signal.
(2) The LC circuit is converted into an inductive and capacitive structure based on microstrip lines.
The high-pass filter is composed of a series capacitor and a parallel connection ground inductance. The series capacitance may be approximated by an interdigital capacitance and the coupled ground inductance may be approximated by a short circuit stub. The low-pass filter is composed of a series inductor and a parallel connection capacitor. The series inductance may be approximately replaced by a section of high impedance microstrip line and the shunt capacitance may be approximately replaced by a section of low impedance line. Taking a fourth order filter as an example, the conversion correspondence is shown in fig. 7.
(3) And combining the low-pass filter and the high-pass filter to perform overall optimization.
And combining the low-pass filter and the high-pass filter converted into the microstrip line to obtain the whole multiplexer structure. Because the microstrip line is used for replacing the LC circuit in the step (2) in an approximately equivalent mode, the situation that the microstrip line cannot be completely equivalent can occur at high frequency, the whole optimization of the microstrip line type multiplexer in the full-wave simulation software is required, the sizes of all parts are finely adjusted, and the performance of the multiplexer is improved.
The design principle is verified by taking a triplexer with a continuous 110-325GHz passband as an example. The three pass bands of the triplexer are 110-170GHz,170-220GHz,220-325GHz, respectively. Gallium arsenide is used as a dielectric plate material, the dielectric constant is 12.9, the loss tangent is 5e-4, and the thickness is 15 microns. The upper metal conductor and the metal ground of the microstrip line are both made of gold with the thickness of 0.5 micrometers.
First, the LC circuit of the triplexer is designed according to step (1). The four-order chebyshev filter is adopted, and the order of the filter can be reduced or increased according to the requirement in practical application. The circuit is constituted by a low-pass, high-pass filter with a cut-off frequency of 170, 220GHz, as shown in fig. 4.
And secondly, converting the LC circuit into an inductance and capacitance structure based on the microstrip line according to the conversion method in the step (2). The microstrip line structure corresponds one-to-one with the elements in the LC circuit to obtain similar performance. Finally, the multiplexer is modeled in Ansys HFSS software and overall optimization is performed according to step (3). The optimized structure is shown in fig. 5. Ports 1, 2 and 3 in FIG. 5 are 110-170GHz,170-220GHz and 220-325GHz signal input ports, respectively, and port 4 is a 110-325GHz signal output port.
Simulation results of a microstrip triplexer with continuous passband are shown in fig. 8 and 9. In the graph of FIG. 8, the transmission coefficient at the band junction is the lowest, at 166 GHz-6.2 dB and at 213 GHz-6 dB. Under the condition of an ideal LC circuit, the boundary frequency points are 170 and 220GHz, the transmission coefficients are-3 dB, and the microstrip triplexer has a certain frequency offset and loss increase due to the fact that the microstrip triplexer works in a terahertz frequency band with higher frequency, but most of the microstrip triplexer has lower frequency loss in a passband. Fig. 9 is a graph of the reflection coefficient of the microstrip triplexer, and the reflection coefficient of the output port 4 is less than-10 dB in all pass bands, showing good impedance matching characteristics. The reflection coefficient of the input ports 1-3 in most frequencies of the passband is less than-10 dB, and the phenomenon of the reflection coefficient rising near the crossover frequency is due to the characteristics of the passband continuum multiplexer, where a portion of the energy can enter the adjacent port.
In summary, the application example of the present application provides a design method for constructing a passband continuous multiplexer by using microstrip lines, and the multiplexer designed based on the method has the advantages of low structural complexity and high integration level. The application example provides a conversion mode of a high-pass filter LC circuit and a microstrip line structure in a microstrip multiplexer with continuous pass bands. The application example of the microstrip triplexer with the continuous 110-325GHz passband has lower loss in the terahertz frequency band.
Compared with a multiplexer in the form of a suspended microstrip line, the microstrip multiplexer has low structural complexity and is easy to integrate with an MMIC circuit. The design method of the high-pass filter in the microstrip multiplexer with continuous passband is higher in quality factor and wider in application range compared with the high-pass filter in a lumped capacitor mode. The design method supports construction of the terahertz frequency band passband continuous multiplexer, and is low in loss.
Those of ordinary skill in the art will appreciate that the various illustrative components, systems, and methods described in connection with the embodiments disclosed herein can be implemented as hardware, software, or a combination of both. The particular implementation is hardware or software dependent on the specific application of the solution and the design constraints. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave.
It should be clear that the present application is not limited to the particular arrangements and processes described above and illustrated in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions, or change the order between steps, after appreciating the spirit of the present application.
The features described and/or illustrated in this application for one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
The foregoing description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the embodiment of the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (9)
1. The construction method of the microstrip multiplexer with continuous pass bands is characterized by comprising the following steps:
generating LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the complementary filter principle to construct and obtain a multiplexer LC circuit;
respectively converting LC circuits corresponding to a low-pass filter and a high-pass filter in the multiplexer LC circuit into element combination structures based on microstrip lines so as to obtain a corresponding microstrip low-pass filter and microstrip high-pass filter;
combining the microstrip low-pass filter and the microstrip high-pass filter to construct a microstrip multiplexer with continuous passband;
the generating LC circuits corresponding to the low-pass filter and the high-pass filter based on the complementary filter principle to construct a multiplexer LC circuit includes:
obtaining LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the Chebyshev complementary filter circuit;
let the n pass bands of the microstrip multiplexer be: (f) 0 ,f 1 )，(f 1 ,f 2 )，(f 2 ,f 3 )，……(f n-1 ,f n ) Based on a preset characteristic impedance value of an input port and each cut-off frequency, calibrating impedance and frequency of LC circuits corresponding to the low-pass filter and the high-pass filter respectively to obtain converted LC circuits corresponding to the low-pass filter and the high-pass filter respectively, wherein the characteristic impedance of the input port of the LC circuits corresponding to the low-pass filter and the high-pass filter respectively is 50 ohms and the cut-off frequency is f respectively 1 ,f 2 ,f 3 ，……f n-1 ；
The transformed product is subjected toThe LC circuits corresponding to the low-pass filter and the high-pass filter are cascaded to obtain corresponding multiplexer LC circuits, so that n pass bands (f 0 ,f 1 ),(f 1 ,f 2 ),(f 2 ,f 3 )……(f n-1 ,f n ) After the signal of (a) is input to the multiplexer LC circuit, the multiplexer LC circuit outputs a signal (f) 0 ,f n ) A signal.
2. The method for constructing a microstrip multiplexer with continuous passband according to claim 1, wherein the converting LC circuits corresponding to the low-pass filter and the high-pass filter in the multiplexer LC circuit into the microstrip line-based element combination structures respectively to obtain the corresponding microstrip low-pass filter and microstrip high-pass filter comprises:
each capacitor connected in series in the LC circuit corresponding to the high-pass filter is replaced by an interdigital capacitor, and each inductor connected with the ground in parallel in the LC circuit corresponding to the high-pass filter is replaced by a microstrip short-circuit branch so as to obtain a corresponding microstrip high-pass filter;
and respectively replacing each inductor connected in series in the LC circuit corresponding to the low-pass filter with a high-impedance microstrip line, and respectively replacing each capacitor connected with the ground in parallel in the LC circuit corresponding to the low-pass filter with a low-impedance microstrip line to obtain the corresponding microstrip low-pass filter.
3. The method for constructing a microstrip multiplexer with continuous passband according to claim 1 or 2, further comprising, after the constructing the microstrip multiplexer with continuous passband:
and performing simulation optimization on the constructed microstrip multiplexer with continuous pass bands in full-wave simulation software.
4. A passband-continuous microstrip multiplexer, wherein the passband-continuous microstrip multiplexer is constructed by the passband-continuous microstrip multiplexer construction method according to any one of claims 1 to 3.
5. The passband-continuous microstrip multiplexer of claim 4, wherein the passband-continuous microstrip multiplexer comprises: a microstrip triplexer with continuous passband;
the microstrip triplexer includes: a first low pass filter, a second low pass filter, a first high pass filter, and a second high pass filter;
a first signal input port is arranged on the primary side of the first low-pass filter;
a second signal input port is arranged on the primary side of the first high-pass filter;
a third signal input port is arranged on the primary side of the second high-pass filter;
the secondary side of the second low-pass filter is provided with a signal output port;
The first low-pass filter and the second low-pass filter are connected with each other, the secondary side of the first high-pass filter is connected between the secondary side of the first low-pass filter and the primary side of the second low-pass filter, and the secondary side of the second high-pass filter is connected between the secondary side of the second low-pass filter and the signal output port.
6. The passband continuous microstrip multiplexer of claim 5, wherein the first signal input port has an operating band of: 110-170GHz;
the working frequency band of the second signal input port is as follows: 170GHz-220GHz;
the working frequency band of the third signal input port is as follows: 220GHz-325GHz;
the working frequency band of the signal output port is as follows: 110GHz-325GHz.
7. A device for constructing a microstrip multiplexer having a continuous passband, comprising:
the circuit generation module is used for generating LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the complementary filter principle so as to construct and obtain a multiplexer LC circuit;
the element conversion module is used for respectively converting the LC circuits corresponding to the low-pass filter and the high-pass filter in the multiplexer LC circuit into element combination structures based on microstrip lines so as to obtain the corresponding microstrip low-pass filter and microstrip high-pass filter;
The multiplexer construction module is used for combining the microstrip low-pass filter and the microstrip high-pass filter to construct a microstrip multiplexer with continuous passband;
the generating LC circuits corresponding to the low-pass filter and the high-pass filter based on the complementary filter principle to construct a multiplexer LC circuit includes:
obtaining LC circuits corresponding to the low-pass filter and the high-pass filter respectively based on the Chebyshev complementary filter circuit;
let the n pass bands of the microstrip multiplexer be: (f) 0 ,f 1 )，(f 1 ,f 2 )，(f 2 ,f 3 )，……(f n-1 ,f n ) Based on a preset characteristic impedance value of an input port and each cut-off frequency, calibrating impedance and frequency of LC circuits corresponding to the low-pass filter and the high-pass filter respectively to obtain converted LC circuits corresponding to the low-pass filter and the high-pass filter respectively, wherein the characteristic impedance of the input port of the LC circuits corresponding to the low-pass filter and the high-pass filter respectively is 50 ohms and the cut-off frequency is f respectively 1 ,f 2 ,f 3 ，……f n-1 ；
Cascading the converted LC circuits corresponding to the low-pass filter and the high-pass filter respectively to obtain corresponding multiplexer LC circuits so as to enable n pass bands (f 0 ,f 1 ),(f 1 ,f 2 ),(f 2 ,f 3 )……(f n-1 ,f n ) After the signal of (a) is input to the multiplexer LC circuit, the multiplexer LC circuit outputs a signal (f) 0 ,f n ) A signal.
8. An electronic device arranged on a train, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of constructing a microstrip multiplexer with continuous passband according to any of claims 1 to 3 when executing the computer program.
9. A computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements a method of constructing a passband-continuous microstrip multiplexer according to any of claims 1 to 3.
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| WO2016061777A1 (en) * | 2014-10-23 | 2016-04-28 | 华为技术有限公司 | Micro-strip multiplexer |
| CN105514547A (en) * | 2016-01-27 | 2016-04-20 | 华南理工大学 | Low-pass band-pass five-duplex based on novel frequency separation structure |
| CN110444840B (en) * | 2019-08-06 | 2021-01-01 | 西安电子科技大学 | Double-frequency differential band-pass filter based on stub load resonator |
| CN113346205B (en) * | 2021-05-13 | 2023-02-03 | 西南交通大学 | Continuous same broadband triplexer of generalized Chebyshev function response channel |
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