Resonant circuit and multi-system access platform inter-frequency combiner
By introducing resonant circuits and multimode resonators into the frequency combiner, signal filtering, frequency selection, and effective isolation are achieved. This solves the problems of insufficient broadband and frequency selectivity of traditional combiners in multi-frequency scenarios, and improves signal transmission quality and network coverage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHONGTIAN COMM TECH CO LTD
- Filing Date
- 2026-06-12
- Publication Date
- 2026-07-14
Smart Images
Figure CN122393588A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of communication technology, and in particular to a resonant circuit and a frequency combiner for a multi-system access platform. Background Technology
[0002] With the rapid development of technologies such as 5G / 6G communication, IoT, and intelligent transportation, wireless communication systems need to support multiple frequency bands and standards simultaneously. In ultra-dense heterogeneous networks, the multi-system access platform, as the core node for signal combining and distribution, undertakes the crucial function of efficiently combining different frequency signals and transmitting them to the antenna system. Therefore, the performance of the core component of the multi-system access platform—the different frequency combiner—directly affects network coverage quality, energy efficiency, and deployment costs.
[0003] However, currently, traditional frequency combiner technology has significant shortcomings in terms of broadband, low loss, high isolation and compactness, leading to problems such as signal interference, increased energy consumption and increased deployment costs, making it difficult to meet the signal transmission quality requirements in high-density scenarios. Summary of the Invention
[0004] This application provides a resonant circuit and a multi-system access platform frequency combiner, which can improve the signal transmission quality in high-density scenarios.
[0005] In a first aspect, embodiments of this application provide a resonant circuit, which includes an input module, a resonant module, and an output module; wherein the input module includes at least one input unit, the resonant module includes at least one multimode resonator, the number of input units and multimode resonators are the same and correspond to each other, and the multimode resonator includes resonant microstrip lines in multiple directions;
[0006] The input unit is connected to the corresponding multimode resonator to receive the input signal and transmit the input signal to the corresponding multimode resonator through the resonant microstrip line of the multimode resonator.
[0007] The multimode resonator is connected to the output module to filter and select the frequency of the received input signal to obtain the processed resonant signal, and then transmits the processed resonant signal to the output module through the resonant microstrip line.
[0008] The output module is used to combine the resonant signals processed by each multimode resonator to output the corresponding combined signal.
[0009] In one possible implementation, the input module includes a first input unit and a second input unit, and the resonant module includes a first multimode resonator and a second multimode resonator.
[0010] The first input unit is connected to the first multimode resonator and is used to receive the first input signal;
[0011] The second input unit is connected to the second multimode resonator and is used to receive the second input signal;
[0012] The first multimode resonator is used to filter and select the frequency of the first input signal to obtain the processed first resonant signal;
[0013] The second multimode resonator is used to filter and select the frequency of the second input signal to obtain the processed second resonant signal.
[0014] In one possible implementation, the first input unit includes a first input microstrip feed line and a first input coupled microstrip line;
[0015] The first input microstrip feed line is connected to the first input coupled microstrip line and is used to receive the first input signal and transmit the first input signal to the first input coupled microstrip line.
[0016] The first input coupling microstrip line is energy coupled to the first multimode resonator, and is used to transmit the first input signal to the first multimode resonator through energy coupling with the first multimode resonator.
[0017] In one possible implementation, the second input unit includes a second input microstrip feed line and a second input coupled microstrip line;
[0018] The second input microstrip feed line is connected to the second input coupled microstrip line and is used to receive the second input signal and transmit the second input signal to the second input coupled microstrip line.
[0019] Energy coupling between the second input coupling microstrip line and the second multimode resonator is used to transmit the second input signal to the second multimode resonator through energy coupling with the second multimode resonator.
[0020] In one possible implementation, the first multimode resonator and the second multimode resonator are cross-shaped multimode resonators.
[0021] In one possible implementation, the first multimode resonator includes a first resonant microstrip line, a second resonant microstrip line, a third resonant microstrip line, and a fourth resonant microstrip line.
[0022] One end of the first resonant microstrip line is energy-coupled with the first input coupling microstrip line, and the other end of the first resonant microstrip line is connected to a preset first target point to receive the first input signal.
[0023] One end of the second resonant microstrip line and one end of the third resonant microstrip line are both connected to the first target point. The other ends of the second resonant microstrip line and the third resonant microstrip line are open-circuited. The second resonant microstrip line and the third resonant microstrip line are used to provide transmission zeros so as to perform filtering and frequency selection processing on the first input signal based on the transmission zeros to obtain the processed first resonant signal.
[0024] The fourth resonant microstrip line is connected to the first target point, and the other end of the fourth resonant microstrip line is energy-coupled to the output module, which is used to transmit the first resonant signal to the output module through energy coupling with the output module.
[0025] In one possible implementation, the second multimode resonator includes a fifth resonant microstrip line, a sixth resonant microstrip line, a seventh resonant microstrip line, and an eighth resonant microstrip line.
[0026] One end of the fifth resonant microstrip line is energy-coupled with the second input coupling microstrip line, and the other end of the fifth resonant microstrip line is connected to a preset second target point to receive the second input signal.
[0027] One end of the sixth resonant microstrip line and one end of the seventh resonant microstrip line are both connected to the second target point. The other ends of the sixth resonant microstrip line and the seventh resonant microstrip line are open-circuited. The sixth resonant microstrip line and the seventh resonant microstrip line are used to provide transmission zeros so as to filter and select the frequency of the second input signal based on the transmission zeros to obtain the processed second resonant signal.
[0028] One end of the eighth resonant microstrip line is connected to the second target point, and the other end of the eighth resonant microstrip line is energy-coupled to the output module, which is used to transmit the second resonant signal to the output module through energy coupling with the output module.
[0029] In one possible implementation, the length of the second resonant microstrip line is greater than the length of the third resonant microstrip line; the length of the sixth resonant microstrip line is greater than the length of the seventh resonant microstrip line.
[0030] In one possible implementation, the output module includes: an output microstrip feed line and an output coupled microstrip line;
[0031] The output coupled microstrip line is used to receive the first resonant signal and the second resonant signal, and to combine the first resonant signal and the second resonant signal to obtain the corresponding combined signal.
[0032] The output microstrip feeder is connected to the output coupled microstrip line, and the output microstrip feeder is used to output the combined signal.
[0033] Secondly, this application provides a frequency combiner, which includes a metal circuit layer, a dielectric substrate and a grounding metal layer.
[0034] The metal circuit layer includes any of the resonant circuits mentioned above, disposed on one side of the dielectric substrate;
[0035] The grounding metal layer is disposed on the other side of the dielectric substrate.
[0036] The resonant circuit and multi-system access platform frequency combiner provided in this application solve the problems of insufficient broadband and frequency selectivity of existing frequency combiners in multi-band scenarios by using multi-mode resonators to filter and select the frequency of signals. Furthermore, multiple multi-mode resonators can effectively isolate multiple input signals, avoiding communication quality degradation caused by spectral overlap. Therefore, the resonant circuit provided in this application can improve signal transmission quality in high-density scenarios. Attached Figure Description
[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0038] Figure 1 This is a schematic diagram of an example scenario;
[0039] Figure 2 A schematic diagram of the resonant circuit provided in this application;
[0040] Figure 3 Schematic diagram B of the resonant circuit provided in this application;
[0041] Figure 4 Schematic diagram C of the resonant circuit provided in this application;
[0042] Figure 5 Schematic diagram D of the resonant circuit provided in this application;
[0043] Figure 6 A schematic diagram E of the resonant circuit provided in this application;
[0044] Figure 7 A schematic diagram F of the resonant circuit provided in this application;
[0045] Figure 8 This is a schematic diagram illustrating the effect of signal filtering and frequency selection processing;
[0046] Figure 9 A schematic diagram G of the resonant circuit provided in this application;
[0047] Figure 10 This is a schematic diagram of the structure of the multi-system access platform frequency combiner provided in this application.
[0048] Figure label:
[0049] L1: First input microstrip feed;
[0050] L2: First input coupled microstrip line;
[0051] L3: Second input microstrip feed;
[0052] L4: Second input coupled microstrip line;
[0053] L5: First resonant microstrip line;
[0054] L6: Second resonant microstrip line;
[0055] L7: Third resonant microstrip line;
[0056] L8: Fourth resonant microstrip line;
[0057] L9: Fifth resonant microstrip line;
[0058] L10: Sixth resonant microstrip line;
[0059] L11: Seventh resonant microstrip line;
[0060] L12: Eighth resonant microstrip line;
[0061] L13: Output coupled microstrip line;
[0062] L14: Output microstrip feed line;
[0063] A: First target point;
[0064] B: Second target point.
[0065] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0066] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0067] It should be noted that, in the description of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The terms "first," "second," etc., in this application are used to distinguish similar objects and are not used to describe a specific order or sequence.
[0068] With the rapid development of new energy technologies, energy storage systems, as key equipment for grid peak shaving, distributed energy management, and renewable energy grid connection, are increasingly being used in a wide range of scenarios. For example, in photovoltaic power plants, wind farms, and industrial and commercial energy storage, energy storage systems are often densely deployed to improve energy density and space utilization.
[0069] Figure 1 As illustrated in the scenario diagram, with the rapid development of technologies such as 5G / 6G communication, IoT, and intelligent transportation, wireless communication systems need to support multiple frequency bands and standards simultaneously. In ultra-dense heterogeneous networks, the multi-system access platform, as the core node for signal combining and distribution, undertakes the crucial function of efficiently combining different frequency signals and transmitting them to the antenna system. Therefore, the performance of the core component of the multi-system access platform—the different frequency combiner—directly affects network coverage quality, energy efficiency, and deployment costs. Figure 1 As shown, a frequency combiner is used to combine multiple frequency signals to obtain a corresponding combined signal. For example, in 5G base station deployment, a multi-system access platform needs to simultaneously process signals from multiple frequency bands, such as macrocells, millimeter-wave small cells, and Wi-Fi 6E hotspots, to achieve seamless network coverage.
[0070] However, currently, traditional frequency combiner technology has significant shortcomings in terms of broadband, low loss, high isolation and compactness, leading to problems such as signal interference, increased energy consumption and increased deployment costs, making it difficult to meet the signal transmission quality requirements in high-density scenarios.
[0071] This application provides a resonant circuit and a frequency combiner for a multi-system access platform. The resonant circuit includes an input module, a resonant module, and an output module. The input module includes at least one input unit, and the resonant module includes at least one multimode resonator. The number of input units and multimode resonators are the same and correspond to each other. The input unit transmits the received input signal to the multimode resonator, which performs filtering and frequency selection processing on the input signal. Finally, the output module performs combining processing on the resonant signal to obtain the corresponding combined signal. This application solves the problems of insufficient broadband and frequency selectivity of existing frequency combiners in multi-band scenarios by using multimode resonators to filter and select the signal. Furthermore, multiple multimode resonators can effectively isolate multiple input signals, avoiding communication quality degradation caused by spectrum overlap. Therefore, the resonant circuit provided by this application can improve signal transmission quality in high-density scenarios.
[0072] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0073] Figure 2 A schematic diagram A of the resonant circuit provided in this application is shown below. Figure 2 As shown, the resonant circuit includes an input module, a resonant module, and an output module. The input module includes at least one input unit, and the resonant module includes at least one multimode resonator. The number of input units and multimode resonators are the same and correspond to each other. Each multimode resonator includes resonant microstrip lines in multiple directions. The input unit is connected to the corresponding multimode resonator to receive the input signal and transmits the input signal to the corresponding multimode resonator through the resonant microstrip lines. The multimode resonator is connected to the output module to perform filtering and frequency selection processing on the received input signal to obtain the processed resonant signal, and transmits the processed resonant signal to the output module through the resonant microstrip lines. The output module performs combining processing on the resonant signals processed by each multimode resonator to output the corresponding combined signal.
[0074] Combined with scenario examples, Figure 1 ,exist Figure 2In the example, input signals 1 to n can be signals of different frequencies in different frequency bands. There is a one-to-one correspondence between input units and multimode resonators, so the resonant circuit can include n input units (input unit 1 to input unit n) and corresponding n multimode resonators (multimode resonator 1 to multimode resonator n). Each input unit receives an input signal and transmits it to the corresponding multimode resonator. The multimode resonator includes resonant microstrip lines in multiple directions. Each input unit is coupled to one of the resonant microstrip lines of the corresponding multimode resonator to transmit the input signal. The multimode resonator is used to filter and select the frequency of the received input signal, converting it into a resonant signal in a preset frequency band. The output module is coupled to one resonant microstrip line of each multimode resonator. Each multimode resonator transmits its resonant signal to the output module through a resonant microstrip line coupled to the output module. Based on this, the output module combines resonant signals 1 to n to obtain and output the corresponding combined signal.
[0075] Based on the resonant circuit provided in this example, the signal is filtered and frequency-selected using a multi-mode resonator, solving the problems of insufficient broadband and frequency selectivity in existing multi-frequency combiners in multi-band scenarios. Furthermore, multiple multi-mode resonators can effectively isolate multiple input signals, avoiding communication quality degradation caused by spectral overlap. Therefore, the resonant circuit provided in this application can improve signal transmission quality in high-density scenarios.
[0076] Optional, Figure 3 The structural schematic diagram B of the resonant circuit provided in this application is as follows: Figure 3 As shown, the input module includes a first input unit and a second input unit, and the resonant module includes a first multimode resonator and a second multimode resonator. The first input unit is connected to the first multimode resonator and is used to receive a first input signal. The second input unit is connected to the second multimode resonator and is used to receive a second input signal. The first multimode resonator is used to perform filtering and frequency selection processing on the first input signal to obtain a processed first resonant signal. The second multimode resonator is used to perform filtering and frequency selection processing on the second input signal to obtain a processed second resonant signal.
[0077] In this example, the input module has two input units, and the resonant module has two multimode resonators. Therefore, the two input units in the input module are defined as the first input unit and the second input unit, and the two multimode resonators in the resonant module are defined as the first multimode resonator and the second multimode resonator. The first input unit receives the first input signal and transmits it to the corresponding first multimode resonator. The second input unit receives the second input signal and transmits it to the corresponding second multimode resonator. The first multimode resonator filters and selects the frequency of the first input signal according to a preset frequency band to obtain the corresponding first resonant signal. The second multimode resonator filters and selects the frequency of the second input signal according to a preset frequency band to obtain the corresponding second resonant signal. Based on the resonant circuit provided in this example, the input signal can be filtered and selected using multimode resonators, allowing for flexible adjustment of the signal frequency. This improves the combining quality of input signals from different frequency bands in the output module, thus enhancing the quality of the final combined signal.
[0078] Optional, Figure 4 The structural schematic diagram C of the resonant circuit provided in this application is shown below. Figure 4 As shown, the first input unit includes a first input microstrip feed line L1 and a first input coupling microstrip line L2; the first input microstrip feed line L1 is connected to the first input coupling microstrip line L2 and is used to receive the first input signal and transmit the first input signal to the first input coupling microstrip line L2; the first input coupling microstrip line L2 is energy coupled to the first multimode resonator and is used to transmit the first input signal to the first multimode resonator through energy coupling with the first multimode resonator.
[0079] In the scenario example, the first input microstrip feed line L1 receives the first input signal and transmits it to the first input coupling microstrip line L2 via an electrical connection between L1 and L2. The first input coupling microstrip line L2 is connected to the first multimode resonator via energy coupling, for example, electromagnetic field coupling. Therefore, the first input coupling microstrip line L2 transmits the first input signal to the first multimode resonator through energy coupling with it.
[0080] Based on the resonant circuit provided in this example, effective isolation between the first input signal and other input signals can be achieved through the energy coupling structure between the first input coupled microstrip line and the first multimode resonator.
[0081] Optional, Figure 5 The structural schematic diagram D of the resonant circuit provided in this application is as follows: Figure 5As shown, the second input unit includes a second input microstrip feed line L3 and a second input coupling microstrip line L4; the second input microstrip feed line L3 is connected to the second input coupling microstrip line L4 to receive the second input signal and transmit the second input signal to the second input coupling microstrip line L4; the second input coupling microstrip line L4 is energy-coupled with the second multimode resonator to transmit the second input signal to the second multimode resonator through energy coupling with the second multimode resonator.
[0082] In the scenario example, the second input microstrip feed line L3 receives the second input signal and transmits it to the second input coupling microstrip line L4 via an electrical connection between L3 and L4. The second input coupling microstrip line L4 is connected to the second multimode resonator via energy coupling, which could also be electromagnetic coupling. Therefore, the second input coupling microstrip line L4 transmits the second input signal to the second multimode resonator through energy coupling with it.
[0083] Based on the resonant circuit provided in this example, effective isolation between the second input signal and other input signals can be achieved through the energy coupling structure between the second input coupled microstrip line and the second multimode resonator.
[0084] Optionally, the first and second multimode resonators are cross-shaped multimode resonators.
[0085] In the example scenario, the cross-shaped multimode resonator is a cross structure composed of four resonant microstrip lines. The cross-shaped multimode resonator can broaden the bandwidth of the input signal by exciting multimode resonance through the four resonant microstrip lines. Furthermore, this example provides two independent cross-shaped multimode resonators to process two input signals, which can improve the isolation between the two input signals while simultaneously broadening the bandwidth by exciting multimode resonance.
[0086] Optional, Figure 6 The schematic diagram E of the resonant circuit provided in this application is as follows: Figure 6As shown, the first multimode resonator includes a first resonant microstrip line L5, a second resonant microstrip line L6, a third resonant microstrip line L7, and a fourth resonant microstrip line L8. One end of the first resonant microstrip line L5 is energy-coupled with a first input coupling microstrip line, and the other end of the first resonant microstrip line L5 is connected to a preset first target point A for receiving a first input signal. One end of the second resonant microstrip line L6 and one end of the third resonant microstrip line L7 are both connected to the first target point A, and the other ends of the second resonant microstrip line L6 and the third resonant microstrip line L7 are open-circuited. The second resonant microstrip line L6 and the third resonant microstrip line L7 are used to provide a transmission zero point to filter and select the frequency of the first input signal based on the transmission zero point to obtain the processed first resonant signal. The fourth resonant microstrip line L8 is connected to the first target point A, and the other end of the fourth resonant microstrip line L8 is energy-coupled with the output module for transmitting the first resonant signal to the output module through energy coupling with the output module.
[0087] In the example scenario, the energy coupling connection between the first input coupling microstrip line L2 and the first multimode resonator is achieved through energy coupling between the first input coupling microstrip line L2 and the first resonant microstrip line L5. The first input coupling microstrip line L2 transmits the first input signal to the first resonant microstrip line L5 through this energy coupling. The first target point A is the intersection of the first resonant microstrip line L5, the second resonant microstrip line L6, the third resonant microstrip line L7, and the fourth resonant microstrip line L8. The other end of the second resonant microstrip line L6 is open-circuited with the other end of the third resonant microstrip line L7, thus forming a transmission zero between them. This transmission zero allows for widening of the input signal bandwidth and effectively suppresses interference, improving frequency selectivity.
[0088] Optional, Figure 7 The schematic diagram F of the resonant circuit provided in this application is as follows: Figure 7As shown, the second multimode resonator includes a fifth resonant microstrip line L9, a sixth resonant microstrip line L10, a seventh resonant microstrip line L11, and an eighth resonant microstrip line L12. One end of the fifth resonant microstrip line L9 is energy-coupled with the second input coupling microstrip line, and the other end of the fifth resonant microstrip line L9 is connected to a preset second target point for receiving the second input signal. One end of the sixth resonant microstrip line L10 and one end of the seventh resonant microstrip line L11 are both connected to the second target point, and the other ends of the sixth resonant microstrip line L10 and the seventh resonant microstrip line L11 are open-circuited. The sixth resonant microstrip line L10 and the seventh resonant microstrip line L11 are used to provide a transmission zero point to filter and select the frequency of the second input signal based on the transmission zero point to obtain the processed second resonant signal. One end of the eighth resonant microstrip line L12 is connected to the second target point, and the other end of the eighth resonant microstrip line L12 is energy-coupled with the output module for transmitting the second resonant signal to the output module through energy coupling with the output module.
[0089] In the scenario example, the energy coupling connection between the second input coupling microstrip line L4 and the second multimode resonator is achieved through energy coupling between the second input coupling microstrip line L4 and the fifth resonant microstrip line L9. The second input coupling microstrip line L4 transmits the second input signal to the fifth resonant microstrip line L9 through this energy coupling. The second target point B is the intersection of the fifth resonant microstrip line L9, the sixth resonant microstrip line L10, the seventh resonant microstrip line L11, and the eighth resonant microstrip line L12. The other end of the sixth resonant microstrip line L10 is open-circuited with the other end of the seventh resonant microstrip line L11, thus forming a transmission zero between them. This transmission zero allows for widening of the input signal bandwidth and effectively suppresses interference, improving frequency selectivity.
[0090] Optionally, the length of the second resonant microstrip line L6 is greater than the length of the third resonant microstrip line L7; the length of the sixth resonant microstrip line L10 is greater than the length of the seventh resonant microstrip line L11.
[0091] Combined with scenario examples, Figure 8 This is a schematic diagram illustrating the effect of signal filtering and frequency selection processing, as shown in the example. Figure 8 As shown, the transmission zero corresponding to the third resonant microstrip line L7 can be defined as transmission zero 1, the transmission zero corresponding to the second resonant microstrip line L6 as transmission zero 2, the transmission zero corresponding to the seventh resonant microstrip line L11 as transmission zero 3, and the transmission zero corresponding to the sixth resonant microstrip line L10 as transmission zero 4. The length of the resonant microstrip line determines the position of the zero; the shorter the resonant microstrip line, the further to the left the corresponding transmission zero is located. Therefore, as shown... Figure 8As shown, transmission zero 1 is located to the left of transmission zero 2, and transmission zero 3 is located to the left of transmission zero 4. Based on the resonant circuit provided in this example, the position of the output zero can be flexibly adjusted by designing the length of the resonant microstrip line, thereby improving the flexibility of signal bandwidth adjustment.
[0092] Optional, Figure 9 The schematic diagram G of the resonant circuit provided in this application is as follows: Figure 9 As shown, the output module includes: an output microstrip feed line L14 and an output coupling microstrip line L13; the output coupling microstrip line L13 is used to receive the first resonant signal and the second resonant signal, and to combine the first resonant signal and the second resonant signal to obtain the corresponding combined signal; the output microstrip feed line L14 is connected to the output coupling microstrip line L13, and the output microstrip feed line L14 is used to output the combined signal.
[0093] In the scenario example, the output coupling microstrip line L13 is connected to the fourth resonant microstrip line L8 and the eighth resonant microstrip line L12 via energy coupling, so the first and second resonant signals can be transmitted to the output coupling microstrip line L13. The output coupling microstrip line L13 can combine the first and second resonant signals to obtain the corresponding combined signal. The output coupling microstrip line L13 transmits the combined signal to the output microstrip feeder L14 through an electrical connection, and then the output microstrip feeder L14 outputs the combined signal.
[0094] Combination Figure 8S31 represents the signal waveform corresponding to the transmission of the first input signal from the first input microstrip feed line L1 to the output microstrip feed line L14; S32 represents the signal waveform corresponding to the transmission of the second input signal from the second input microstrip feed line L3 to the output microstrip feed line L14; S11 represents the signal waveform of return loss; and S12 represents the interference signal waveform between the first and second input signals. As can be seen from the waveform in S31, the presence of transmission zeros 1 and 2 lowers the amplitude of the waveform, allowing for selection of the frequency band of the first input signal. Based on S31, the selected frequency band for the first input signal is approximately 1.12 GHz to 1.32 GHz. Therefore, the bandwidth corresponding to the first input signal at a preset amplitude (e.g., -3 dB) can be broadened to approximately 200 MHz. Similarly, as can be seen from the waveform in S32, the presence of transmission zeros 3 and 4 lowers the waveform amplitude, allowing selection of the second input signal's frequency band. S32 determines that the selected frequency band for the second input signal is approximately 1.38GHz to 1.62GHz, thus widening the bandwidth of the second input signal at a preset amplitude (e.g., -3dB) to approximately 240MHz. The waveform in S12 shows that the isolation between signals is better than 20dB. The waveform in S11 shows that the return loss is better than 10dB.
[0095] Based on the resonant circuit provided in this application embodiment, the signal is filtered and frequency-selected using a multi-mode resonator, solving the problems of insufficient broadband and frequency selectivity in existing multi-frequency combiners in multi-band scenarios. Furthermore, multiple multi-mode resonators can effectively isolate multiple input signals, avoiding communication quality degradation caused by spectral overlap. Therefore, the resonant circuit provided in this application can improve signal transmission quality in high-density scenarios.
[0096] Figure 10 This is a schematic diagram of the structure of the multi-system access platform frequency combiner provided in this application, as shown below. Figure 10 As shown, the multi-system access platform frequency combiner includes: a metal circuit layer, a dielectric substrate, and a ground metal layer; the metal circuit layer includes any of the aforementioned resonant circuits and is disposed on one side of the dielectric substrate; the ground metal layer is disposed on the other side of the dielectric substrate.
[0097] In the example scenario, the metal circuit layer, dielectric substrate, and ground metal layer constitute a typical sandwich-style core stack-up structure (top layer: metal circuit layer, middle layer: dielectric substrate, bottom layer: ground metal layer). The dielectric substrate serves as the carrier for the metal circuit layer, which can include any of the resonant circuit structures exemplified above. The ground metal layer provides a reference ground, suppresses electromagnetic radiation losses, and reduces the dielectric loss of the dielectric substrate.
[0098] The multi-system access platform frequency combiner provided in this embodiment can achieve similar technical effects to any of the resonant circuits mentioned above, and will not be described in detail here.
[0099] It is worth mentioning that, in the embodiments of this application, the division of units is merely a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.
[0100] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0101] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0102] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0103] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.
[0104] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.
Claims
1. A resonant circuit, characterized in that, The resonant circuit includes: an input module, a resonant module, and an output module; wherein, the input module includes at least one input unit, the resonant module includes at least one multimode resonator, the number of input units and the number of multimode resonators are the same and they correspond to each other, and the multimode resonator includes resonant microstrip lines in multiple directions; The input unit is connected to the corresponding multimode resonator to receive the input signal and transmit the input signal to the corresponding multimode resonator through the resonant microstrip line of the multimode resonator. The multimode resonator is connected to the output module and is used to filter and select the frequency of the received input signal to obtain the processed resonant signal, and transmit the processed resonant signal to the output module through the resonant microstrip line. The output module is used to combine the resonant signals processed by each multimode resonator to output the corresponding combined signal.
2. The resonant circuit according to claim 1, characterized in that, The input module includes a first input unit and a second input unit, and the resonant module includes a first multimode resonator and a second multimode resonator; The first input unit is connected to the first multimode resonator and is used to receive the first input signal; The second input unit is connected to the second multimode resonator and is used to receive the second input signal; The first multimode resonator is used to filter and select the frequency of the first input signal to obtain the processed first resonant signal; The second multimode resonator is used to filter and select the frequency of the second input signal to obtain the processed second resonant signal.
3. The resonant circuit according to claim 2, characterized in that, The first input unit includes a first input microstrip feed line and a first input coupled microstrip line; The first input microstrip feed line is connected to the first input coupled microstrip line and is used to receive the first input signal and transmit the first input signal to the first input coupled microstrip line. The first input coupling microstrip line is energy coupled to the first multimode resonator, and is used to transmit the first input signal to the first multimode resonator through energy coupling with the first multimode resonator.
4. The resonant circuit according to claim 3, characterized in that, The second input unit includes a second input microstrip feed line and a second input coupled microstrip line; The second input microstrip feed line is connected to the second input coupled microstrip line and is used to receive the second input signal and transmit the second input signal to the second input coupled microstrip line. The second input coupling microstrip line is energy-coupled with the second multimode resonator to transmit the second input signal to the second multimode resonator through energy coupling with the second multimode resonator.
5. The resonant circuit according to claim 4, characterized in that, The first and second multimode resonators are cross-shaped multimode resonators.
6. The resonant circuit according to claim 5, characterized in that, The first multimode resonator includes a first resonant microstrip line, a second resonant microstrip line, a third resonant microstrip line, and a fourth resonant microstrip line; One end of the first resonant microstrip line is energy-coupled with the first input coupling microstrip line, and the other end of the first resonant microstrip line is connected to a preset first target point to receive the first input signal. One end of the second resonant microstrip line and one end of the third resonant microstrip line are both connected to the first target point. The other ends of the second resonant microstrip line and the third resonant microstrip line are open-circuited. The second resonant microstrip line and the third resonant microstrip line are used to provide a transmission zero point so as to perform filtering and frequency selection processing on the first input signal based on the transmission zero point to obtain the processed first resonant signal. The fourth resonant microstrip line is connected to the first target point, and the other end of the fourth resonant microstrip line is energy coupled to the output module, so as to transmit the first resonant signal to the output module through energy coupling with the output module.
7. The resonant circuit according to claim 6, characterized in that, The second multimode resonator includes a fifth resonant microstrip line, a sixth resonant microstrip line, a seventh resonant microstrip line, and an eighth resonant microstrip line; One end of the fifth resonant microstrip line is energy-coupled with the second input coupling microstrip line, and the other end of the fifth resonant microstrip line is connected to a preset second target point to receive the second input signal. One end of the sixth resonant microstrip line and one end of the seventh resonant microstrip line are both connected to the second target point. The other ends of the sixth resonant microstrip line and the seventh resonant microstrip line are open-circuited. The sixth resonant microstrip line and the seventh resonant microstrip line are used to provide a transmission zero point so as to perform filtering and frequency selection processing on the second input signal based on the transmission zero point to obtain the processed second resonant signal. One end of the eighth resonant microstrip line is connected to the second target point, and the other end of the eighth resonant microstrip line is energy-coupled to the output module, so as to transmit the second resonant signal to the output module through energy coupling with the output module.
8. The resonant circuit according to claim 7, characterized in that, The length of the second resonant microstrip line is greater than the length of the third resonant microstrip line; the length of the sixth resonant microstrip line is greater than the length of the seventh resonant microstrip line.
9. The resonant circuit according to claim 8, characterized in that, The output module includes: an output microstrip feed line and an output coupled microstrip line; The output coupled microstrip line is used to receive the first resonant signal and the second resonant signal, and to combine the first resonant signal and the second resonant signal to obtain the corresponding combined signal; The output microstrip feed line is connected to the output coupled microstrip line, and the output microstrip feed line is used to output the combined signal.
10. A multi-system access platform frequency combiner, characterized in that, The multi-system access platform frequency combiner includes: a metal circuit layer, a dielectric substrate, and a grounding metal layer; The metal circuit layer includes the resonant circuit as described in any one of claims 1-9, disposed on one side of the dielectric substrate; The grounding metal layer is disposed on the other side of the dielectric substrate.