Broadband filtering device and multi-system access platform

Abstract

The application provides a broadband filtering device and a multi-system access platform, and relates to the technical field of multi-system access platforms, wherein the broadband filtering device comprises a dielectric substrate, a resonator arranged on the surface of the dielectric substrate, and a plurality of input units arranged around the resonator; each input unit comprises a first coupling line, a second coupling line and an input piece arranged on the surface of the dielectric substrate; the first coupling line and the second coupling line are connected with the input piece; the first coupling line and the second coupling line are coupled with the resonator; and the input piece is used for inputting an electric signal. The broadband filtering device and the multi-system access platform provided by the application solve the problem of narrow bandwidth of the filtering device in the prior art.

Description

Technical Field

[0001] This application relates to the field of multi-system access platform technology, and in particular to a broadband filtering device and a multi-system access platform. Background Technology

[0002] The multi-system access platform (POI) is mainly used for multi-band and multi-signal combining to achieve compatible coverage of multiple network signals. The filtering device is an important component of the multi-system access platform.

[0003] In related technologies, filtering devices include a dielectric substrate and a bridge circuit disposed on the upper surface of the dielectric substrate. The bridge circuit often employs an odd-even mode crossover structure, i.e., a crossover bridge design based on odd-even mode analysis, which transmits energy diagonally and utilizes the 180° phase difference between odd and even modes to achieve signal path isolation.

[0004] However, the bandwidth of the aforementioned filtering device is relatively narrow during operation. Summary of the Invention

[0005] This application provides a broadband filtering device and a multi-system access platform to solve the problem of narrow bandwidth in the operation of existing filtering devices.

[0006] On one hand, this application provides a broadband filtering device, comprising:

[0007] Dielectric substrate;

[0008] A resonator disposed on the surface of the dielectric substrate;

[0009] Multiple input units are wound around the resonator. Each input unit includes a first coupling line, a second coupling line, and an input element disposed on the surface of the dielectric substrate. Both the first coupling line and the second coupling line are connected to the input element and are coupled to the resonator. The input element is used to input electrical signals.

[0010] In one possible implementation, in the same input unit, the extension direction of the first coupling line is set at an angle to the extension direction of the second coupling line, and the first coupling line and the second coupling line are respectively distributed on the adjacent sides of the resonator.

[0011] In one possible implementation, the width of the first coupling line is greater than the width of the second coupling line.

[0012] In one possible implementation, each of the first coupling lines is symmetrically distributed on opposite sides of the resonator, and each of the second coupling lines is symmetrically distributed on the other opposite sides of the resonator.

[0013] In one possible implementation, either the first coupling line or the second coupling line is connected to a short-circuit element, the short-circuit element being used for grounding, and the short-circuit element being spaced apart from the short-circuit elements on adjacent input units.

[0014] In one possible implementation, a second metal layer is further included, which is disposed on the dielectric substrate and is used for grounding. The short-circuit element is electrically connected to the second metal layer.

[0015] In one possible implementation, the short-circuit element has a grounding via, and the short-circuit element is electrically connected to the second metal layer through the grounding via.

[0016] In one possible implementation, the resonator is a ring microstrip resonator, and the inner side of the resonator has a connecting segment that connects the opposite ends of the ring microstrip resonator.

[0017] In one possible implementation, the connecting segment extends along a curved trajectory such that the length of the connecting segment is greater than the distance between the two ends of the annular microstrip resonator connected to the connecting segment.

[0018] And / or, the ring microstrip resonator includes two first unit segments and two second unit segments arranged opposite to each other, with each first unit segment and each second unit segment connected alternately in sequence, the width of the first unit segment being greater than the width of the second unit segment, and the two ends of the connecting segment being connected to the two first unit segments respectively.

[0019] On the other hand, this application provides a multi-system access platform, including: at least one combiner and a broadband filtering device as described in any of the above embodiments, wherein the combiner is used to receive and process signal sources, and the broadband filtering device is used to process the output signal of the combiner.

[0020] This application provides a broadband filtering device and a multi-system access platform. The broadband filtering device includes: a dielectric substrate; a resonator disposed on the surface of the dielectric substrate; and multiple input units wound around the resonator. Each input unit includes a first coupling line, a second coupling line, and an input element disposed on the surface of the dielectric substrate. Both the first and second coupling lines are connected to the input element and coupled to the resonator. The input element is used to input electrical signals. Therefore, during operation, electrical signals are transmitted from the input elements of each input unit to the first and second coupling lines, and then transmitted to the resonator through enhanced coupling, causing the resonator to radiate signals. This directionally enhances the electromagnetic field coupling strength, optimizes energy transmission efficiency, forms a basic path for broadband signal transmission, and increases the bandwidth of the filtering device during operation, solving the problem of narrow bandwidth in existing filtering devices. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the structure of a broadband filtering device provided in an embodiment of this application;

[0023] Figure 2 for Figure 1 A schematic diagram of the structure of the first metal layer in the middle;

[0024] Figure 3 An S-parameter diagram of a broadband filtering device provided in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of a multi-system access platform provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100 - Dielectric substrate;

[0028] 200-resonator;

[0029] 210 - First Unit Segment;

[0030] 220 - Second Unit Segment;

[0031] 230-Connecting section;

[0032] 300 - Input Unit;

[0033] 310 - First coupling line;

[0034] 320 - Second coupling line;

[0035] 330 - Input;

[0036] 400 - Short-circuit component;

[0037] 410 - First short-circuit branch;

[0038] 420 - Second short-circuit stub;

[0039] 430 - Grounding via;

[0040] 500 - Second metal layer.

[0041] 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

[0042] 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.

[0043] In related technologies, multi-system access platforms (POIs) are mainly used for multi-band, multi-signal combining to achieve compatible coverage of multiple network signals. Filtering devices are crucial components of POIs. A filtering device includes a dielectric substrate and a bridge circuit mounted on the upper surface of the substrate. The bridge circuit often employs an odd-even mode crossover structure, i.e., a crossover bridge design based on odd-even mode analysis. It transmits energy diagonally and utilizes the 180° phase difference between odd and even modes to achieve signal path isolation.

[0044] However, although the above-mentioned filter devices have advantages such as small size and ease of processing, their bandwidth is relatively narrow during operation.

[0045] Therefore, this application provides a broadband filtering device and a multi-system access platform. The broadband filtering device includes: a dielectric substrate; a resonator disposed on the surface of the dielectric substrate; and multiple input units wound around the resonator. Each input unit includes a first coupling line, a second coupling line, and an input element disposed on the surface of the dielectric substrate. Both the first and second coupling lines are connected to the input element, and both are coupled to the resonator. The input element is used to input electrical signals. Thus, during operation, electrical signals are transmitted from the input elements of each input unit to the first and second coupling lines, and then transmitted to the resonator via enhanced coupling, causing the resonator to radiate signals. This directionally enhances the electromagnetic field coupling strength, optimizes energy transmission efficiency, forms a basic path for broadband signal transmission, increases the bandwidth of the filtering device during operation, and solves the problem of narrow bandwidth in existing filtering devices.

[0046] 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.

[0047] like Figure 1 and Figure 2 As shown, this application embodiment provides a broadband filtering device, including:

[0048] Dielectric substrate 100;

[0049] Resonator 200, resonator 200 is used to be disposed on the surface of dielectric substrate 100;

[0050] Multiple input units 300 are wound around the resonator 200;

[0051] The input unit 300 includes a first coupling line 310, a second coupling line 320 and an input element 330 disposed on the surface of the dielectric substrate 100. The first coupling line 310 and the second coupling line 320 are both connected to the input element 330. The first coupling line 310 and the second coupling line 320 are both coupled to the resonator 200. The input element 330 is used to input electrical signals.

[0052] In this embodiment, the broadband filtering device includes a first metal layer disposed on the upper surface of the dielectric substrate 100. The first metal layer includes a resonator 200 and a plurality of input units 300, both of which are disposed on the upper surface of the dielectric substrate 100. Furthermore, each input unit 300 is wound around the resonator 200.

[0053] The input unit 300 can be set to two, four, six, eight, or other numbers, without limitation; in this embodiment, four input units 300 are used as an example. The resonator 200 can be a ring microstrip resonator, a patch resonator, or other types of resonator, without limitation.

[0054] The input unit 300 includes a first coupling line 310, a second coupling line 320, and an input element 330, all of which are disposed on the upper surface of the dielectric substrate 100.

[0055] Specifically, one end of the input element 330 extends to the edge of the dielectric substrate 100, and both the first coupling line 310 and the second coupling line 320 are connected to the other end of the input element 330. This allows electrical signals to be input from the input element 330 and then transmitted through the input element 330 to the first coupling line 310 and the second coupling line 320. Both the first coupling line 310 and the second coupling line 320 are coupled to the resonator 200.

[0056] The input element 330 can be a standard impedance microstrip feed line, such as a 50-ohm microstrip feed line, or a low-impedance or high-impedance microstrip feed line; there are no restrictions on this. The first coupling line 310 and the second coupling line 320 can be connected to the input element 330 by integral molding, welding, bonding, or other methods.

[0057] Therefore, when the filter is working, the electrical signal is transmitted from the input element 330 on each input unit 300 to the first coupling line 310 and the second coupling line 320, and then transmitted to the resonator 200 through enhanced coupling, so that the resonator 200 generates a radiated signal; thereby directionally enhancing the electromagnetic field coupling strength, optimizing the energy transmission efficiency, forming a basic path for broadband signal transmission, increasing the bandwidth of the filter when it is working, and solving the problem of narrow bandwidth of the filter when it is working in the prior art.

[0058] It should be noted that the material of the dielectric substrate 100 is not limited, such as ceramic substrate, epoxy resin substrate, polytetrafluoroethylene vinyl sheet, etc. The first metal layer can be copper, aluminum or other metal materials. The resonator 200, the first coupling line 310, the second coupling line 320 and the input component 330 can all be fixed to the upper surface of the dielectric substrate 100 by bonding, welding or other means.

[0059] Additionally, it should be noted that when different substrate materials are used for the dielectric substrate 100, the device structure parameters can be readjusted to meet the required operating frequency band and bandwidth requirements.

[0060] like Figure 2 As shown, in this embodiment, the resonator 200 is a ring microstrip resonator, and the inner side of the resonator 200 has a connecting section 230, which connects the two opposite ends of the ring microstrip resonator.

[0061] Therefore, by coupling the ring microstrip resonator with the first coupling line 310 and the second coupling line 320, the resonant characteristics of the closed loop can be used to excite the multimode transmission poles. The frequency superposition effect of the poles can be used to extend the passband range, avoid the insertion loss accumulation problem of traditional cascaded filters, and reduce the loss.

[0062] Furthermore, the ring microstrip resonator includes two first unit segments 210 and two second unit segments 220 arranged opposite to each other. Each first unit segment 210 and each second unit segment 220 are sequentially staggered. The width of the first unit segment 210 is greater than the width of the second unit segment 220. The two ends of the connecting segment 230 are respectively connected to the two first unit segments 210.

[0063] Therefore, during operation, different equivalent electrical lengths and current distributions can be achieved by using the first unit segment 210 and the second unit segment 220 with different widths, which can excite multiple resonant modes; furthermore, the connecting segment 230 widens the impedance bandwidth near the resonant point through coupling. This enables dual-frequency / multi-frequency operation and expands the bandwidth.

[0064] Specifically, the connecting segment 230 is located in the middle of the ring microstrip resonator, and the connecting segment 230 extends along a curved trajectory so that the length of the connecting segment 230 is greater than the distance between the two ends of the ring microstrip resonator connected to the connecting segment 230.

[0065] The connection segment 230 is designed in this way, which can increase the length of the connection segment 230 within the limited space in the ring microstrip resonator, thereby increasing the equivalent electrical length, enabling the filter device to achieve a wide bandwidth, and facilitating miniaturization.

[0066] In practice, for example, each first unit segment 210, each second unit segment 220, and the connecting segment 230 can be integrally formed to create a ring microstrip resonator. Alternatively, the first unit segment 210 can be connected to the second unit segment 220, or the first unit segment 210 can be connected to the connecting segment 230, by welding, bonding, or other means.

[0067] like Figure 2 As shown, in some embodiments, in the same input unit 300, the extension direction of the first coupling line 310 is set at an angle to the extension direction of the second coupling line 320, and the first coupling line 310 and the second coupling line 320 are respectively distributed on the two adjacent sides of the resonator 200.

[0068] Each first coupling line 310 is symmetrically distributed on opposite sides of the resonator 200, and each second coupling line 320 is symmetrically distributed on the other opposite sides of the resonator 200.

[0069] In this embodiment, the resonator 200 is a rectangular ring microstrip resonator. At this time, four input units 300 are provided, and the four input units 300 are correspondingly arranged at the four corners of the resonator 200, and the multiple input units 300 are arranged symmetrically.

[0070] In each input unit 300, the first coupling line 310 and the second coupling line 320 are both located outside the resonator 200. The extension direction of the first coupling line 310 is consistent with the extension direction of the input element 330, and the extension direction of the second coupling line 320 is perpendicular to the extension direction of the first coupling line 310. The extension direction of the first coupling line 310 is parallel to the extension direction of the first unit segment 210, and the extension direction of the second coupling line 320 is parallel to the extension direction of the second unit segment 220.

[0071] like Figure 2 As shown, further, each of the first coupling lines 310 is symmetrically distributed on both sides of the resonator 200 corresponding to the first unit segment 210; each of the second coupling lines 320 is symmetrically distributed on both sides of the resonator 200 corresponding to the second unit segment 220.

[0072] Specifically, in this embodiment, two first coupling lines 310 are symmetrically distributed and correspond to the first unit segment 210 on one side of the resonator 200; the other two first coupling lines 310 are symmetrically distributed and correspond to the first unit segment 210 on the other side of the resonator 200. Furthermore, the two first coupling lines 310 and the other two first coupling lines 310 are also symmetrically distributed with each other.

[0073] Similar to the first coupling line 310, two second coupling lines 320 are symmetrically distributed and correspond to the second unit segment 220 on one side of the resonator 200; the other two second coupling lines 320 are symmetrically distributed and correspond to the second unit segment 220 on the other side of the resonator 200. Furthermore, the two second coupling lines 320 are also symmetrically distributed with the other two second coupling lines 320.

[0074] Therefore, it can be understood that the input element 330, the first coupling line 310, and the second coupling line 320 together constitute a Y-shaped microstrip coupling structure. Furthermore, a nested coupling structure is formed between the resonator 200 and each of the first coupling lines 310 and second coupling lines 320.

[0075] Therefore, when the filter is working, the electrical signal is transmitted from the input element 330 on each input unit 300 to the first coupling line 310 and the second coupling line 320, and then transmitted to the resonator 200 through enhanced coupling, causing the resonator 200 to radiate a signal. During operation, the coupling area between the coupling line (i.e., the combination of the first coupling line 310 and the second coupling line 320) and the resonator 200 can be increased, thereby improving the coupling efficiency and helping to expand the bandwidth of the resonator 200. At the same time, the symmetry of the coupled signal between the first coupling line 310 and the second coupling line 320 and the resonator 200 is improved.

[0076] like Figure 2 As shown, in some embodiments, the width of the first coupling line 310 is greater than the width of the second coupling line 320.

[0077] Therefore, during operation, the first coupling line 310 is suitable for low-frequency resonance, and the second coupling line 320 is suitable for high-frequency resonance. Furthermore, by simultaneously exciting multiple modes of the resonator 200 through the first coupling line 310 and the second coupling line 320 with different widths, it is easy to achieve dual-frequency or multi-frequency response, while giving the filter device a wider operating bandwidth.

[0078] In some embodiments, either the first coupling line 310 or the second coupling line 320 is connected to a short circuit 400, the short circuit 400 is used for grounding, and the short circuit 400 is spaced apart from the short circuit 400 on the adjacent input unit 300.

[0079] Therefore, during the operation of the filter device, the shorting element 400 can be used to increase the zero point and improve out-of-band selectivity. In addition, the shorting element 400 is spaced apart from the shorting elements 400 on the adjacent input unit 300 to ensure that there is no coupling relationship between the two adjacent shorting elements 400, which helps to reduce interference and crosstalk, and ensures that the signal transmission of each first coupling line 310 is more independent and stable.

[0080] In practice, for example, the short-circuit element 400 can be connected to the first coupling line 310 by integral molding, welding or other means; the short-circuit element 400 can also be connected to the second coupling line 320 by integral molding, welding or other means.

[0081] In this embodiment, the short-circuit element 400 can be disposed on the upper surface of the dielectric substrate 100, and the short-circuit element 400 can also be bonded to the dielectric substrate 100.

[0082] like Figure 1 and Figure 2 As shown, the broadband filter further includes a second metal layer 500, which is disposed on the dielectric substrate 100 and is used for grounding. The short-circuit element 400 is electrically connected to the second metal layer 500.

[0083] The short-circuit component 400 has a grounding through hole 430, and the short-circuit component 400 is electrically connected to the second metal layer 500 through the grounding through hole 430.

[0084] In this embodiment, the second metal layer 500 can be made of copper, aluminum, or other materials, and can be fixed to the lower surface of the dielectric substrate 100 by bonding, welding, or other means. In practice, the second metal layer 500 is grounded directly or indirectly through a wire.

[0085] The short-circuit component 400 is connected to the first coupling line 310. A grounding through hole 430 is provided on the short-circuit component 400. The short-circuit component 400 is electrically connected to the second metal layer 500 through the grounding through hole 430.

[0086] like Figure 2 As shown, specifically, the short-circuit element 400 can be a short-circuit stub, which includes an integrally formed first short-circuit stub 410 and a second short-circuit stub 420. One end of the first short-circuit stub 410 is connected to the end of the first coupling line 310 away from the input element 330, and the other end of the first short-circuit stub 410 is connected to one end of the second short-circuit stub 420.

[0087] Furthermore, the extension direction of the first short-circuit stub 410 is perpendicular to the extension direction of the first coupling line 310, and the extension direction of the second short-circuit stub 420 is perpendicular to the extension direction of the first short-circuit stub 410, so that the extension direction of the second short-circuit stub 420 is parallel to the extension direction of the first coupling line 310, and the second short-circuit stub 420 and the first coupling line 310 are located on the same side of the first short-circuit stub 410.

[0088] In this embodiment, a grounding via 430 is provided on the short-circuit element 400. The grounding via 430 is a metallized via and is located at the end of the second short-circuit stub 420 away from the first short-circuit stub 410. This allows the short-circuit element 400 on the second coupling line 320 to pass through, and the short-circuit element 400 to be grounded through the grounding via 430 and the second metal layer 500, thereby improving the out-of-band selectivity of the filter device.

[0089] For the short-circuit elements 400 on the two first coupling lines 310 corresponding to the first unit segment 210 in the resonator 200, the first short-circuit stub 410 on one first coupling line 310 and the first short-circuit stub 410 on the other first coupling line 310 are spaced apart to ensure that there is no coupling relationship between the two adjacent short-circuit elements 400.

[0090] In other embodiments, the short-circuit element 400 may also be configured as a short-circuit branch of other shapes.

[0091] In summary, the broadband filtering device of this multi-system access platform can achieve performance breakthroughs through multi-level structural collaborative design.

[0092] For example, the core coupling layer adopts a Y-shaped microstrip coupling structure formed by the input element 330, the first coupling line 310 and the second coupling line 320. Its symmetrical branch layout optimizes the energy transmission efficiency at the physical level through the directional enhancement of the electromagnetic field coupling strength, forming the basic path for broadband signal transmission.

[0093] Extended resonant layer: Based on the nested coupling of the ring microstrip resonator with the first coupling line 310 and the second coupling line 320, the resonant characteristics of the closed loop are used to excite the multimode transmission poles. The passband range is extended through the frequency superposition effect of the poles, avoiding the insertion loss accumulation problem of traditional cascaded filters.

[0094] Out-of-band suppression layer: Through the integrated design of short-circuit stubs and ring microstrip resonators, out-of-band stray energy is directionally absorbed by leveraging the high-frequency short-circuit effect. Combined with the inherent frequency selectivity of the resonant unit, a steep roll-off at the passband edge and deep suppression of out-of-band signals are achieved.

[0095] Isolation Optimization Layer: Based on the parity-even mode equivalent circuit model, by adjusting the impedance matching relationship of the coupling nodes, the odd mode signals form reverse phase cancellation at the isolation port, while the transmission link is strengthened by the in-phase superposition of the even mode signals, thereby achieving dynamic energy balance and isolation between ports over a wide frequency range.

[0096] Thus, through the synergistic optimization of electromagnetic coupling mechanism and equivalent circuit model, each layer of structure achieves the unity of broadband transmission, high out-of-band suppression and strong port isolation in a compact space. Its single-layer microstrip architecture is compatible with standardized circuit technology and is suitable for miniaturized RF front-ends of high-frequency communication systems, combining design flexibility, manufacturing cost advantages and anti-interference capabilities.

[0097] like Figure 2 and Figure 3 As shown, S-parameters characterize the transmission and reflection characteristics of the RF network between different ports, reflecting the performance of the filtering device. It should be noted that... Figure 3 In the diagram, |S11| represents the ratio of the signal reflected back from port 1 to the signal input to port 1; |S33| represents the ratio of the signal reflected back from port 3 to the signal input to port 3; |S21| represents the ratio of the signal transmitted from port 1 to port 2 via the network to the signal input to port 1; |S43| represents the ratio of the signal transmitted from port 3 to port 4 via the network to the signal input to port 3; |S41| represents the ratio of the signal transmitted from port 1 to port 4 via the network to the signal input to port 1; |S32| represents the ratio of the signal transmitted from port 2 to port 3 via the network to the signal input to port 2; |S31| represents the ratio of the signal transmitted from port 1 to port 3 via the network to the signal input to port 1; |S42| represents the ratio of the signal transmitted from port 2 to port 4 via the network to the signal input to port 2.

[0098] Depend on Figure 3 It can be seen that the frequency range of the cross channel is 2.726GHz~3.063GHz (bandwidth 340MHz). The insertion loss of the cross channel is 0.8dB, and the signal isolation between adjacent ports is better than 12dB.

[0099] In summary, the broadband filtering device provided in this application, during operation, transmits electrical signals from the input devices 330 on each input unit 300 to the first coupling line 310 and the second coupling line 320, and then transmits them to the resonator 200 through enhanced coupling, causing the resonator 200 to radiate signals to the outside; thereby directionally enhancing the electromagnetic field coupling strength, optimizing energy transmission efficiency, forming a basic path for broadband signal transmission, increasing the bandwidth of the filtering device during operation, and solving the problem of narrow bandwidth in the prior art of filtering devices during operation.

[0100] This application provides a multi-system access platform, including: at least one combiner and a broadband filtering device as described in any of the above embodiments, wherein the combiner is used to receive and process signal sources, and the broadband filtering device is used to process the output signal of the combiner.

[0101] like Figure 4 As shown, in this embodiment, multiple combiners can be provided, and at least some of them are inter-frequency combiners. The inter-frequency combiners, the broadband filter, and the combiners are electrically connected in sequence. The inter-frequency combiner is used to receive and process the signal source. The broadband filter processes the output signal of the inter-frequency combiner and then transmits the output signal to the combiner. Subsequently, the combiner can be provided with output ports ANT1 and ANT2 to output signals through ANT1 or ANT2; of course, other numbers of output ports are also possible, and there is no limitation on this. The broadband filter also serves to isolate signals and suppress crosstalk.

[0102] In practice, the frequency combiner can be electrically or coupled to the input 330 of the broadband filter.

[0103] During operation, the output signal of the frequency combiner is transmitted from the input element 330 to the first coupling line 310 and the second coupling line 320, and then transmitted to the resonator 200 through enhanced coupling, so that the resonator 200 generates a radiated signal; thereby directionally enhancing the electromagnetic field coupling strength, optimizing energy transmission efficiency, forming a basic path for broadband signal transmission, increasing the bandwidth of the filter device during operation, and solving the problem of narrow bandwidth of the filter device in the prior art.

[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 broadband filtering device, characterized in that, include: Dielectric substrate (100); A resonator (200) is disposed on the surface of the dielectric substrate (100); Multiple input units (300) are wound around the resonator (200). Each input unit (300) includes a first coupling line (310), a second coupling line (320), and an input element (330) disposed on the surface of the dielectric substrate (100). The first coupling line (310) and the second coupling line (320) are both connected to the input element (330). The first coupling line (310) and the second coupling line (320) are both coupled to the resonator (200). The input element (330) is used to input electrical signals. In the same input unit (300), the extension direction of the first coupling line (310) is set at an angle to the extension direction of the second coupling line (320), and the first coupling line (310) and the second coupling line (320) are respectively distributed on the adjacent sides of the resonator (200); The width of the first coupling line (310) is greater than the width of the second coupling line (320); Each of the first coupling lines (310) is symmetrically distributed on opposite sides of the resonator (200), and each of the second coupling lines (320) is symmetrically distributed on the other opposite sides of the resonator (200), so that the input element (330), the first coupling line (310) and the second coupling line (320) together form a Y-shaped microstrip coupling structure; The first coupling line (310) is connected to a short circuit element (400), which is used for grounding. The short circuit element (400) is spaced apart from the short circuit elements (400) on the adjacent input unit (300). The short-circuit component (400) includes an integrally formed first short-circuit stub (410) and a second short-circuit stub (420). The first short-circuit stub (410) is perpendicularly connected to the first coupling line (310), and the second short-circuit stub (420) is perpendicularly connected to the first short-circuit stub (410). The second short-circuit stub (420) and the first coupling line (310) are located on the same side of the first short-circuit stub (410). The resonator (200) is a ring microstrip resonator, and the inner side of the resonator (200) has a connecting section (230) that connects the opposite ends of the ring microstrip resonator. The connecting segment (230) extends along a curved trajectory such that the length of the connecting segment (230) is greater than the distance between the two ends of the ring microstrip resonator connected to the connecting segment (230).

2. The broadband filtering device according to claim 1, characterized in that, It also includes a second metal layer (500) disposed on the dielectric substrate (100), the second metal layer (500) being used for grounding, and the short-circuit element (400) being electrically connected to the second metal layer (500).

3. The broadband filtering device according to claim 2, characterized in that, The short-circuit component (400) has a grounding through hole (430), and the short-circuit component (400) is electrically connected to the second metal layer (500) through the grounding through hole (430).

4. The broadband filtering device according to claim 1, characterized in that, The ring microstrip resonator includes two first unit segments (210) and two second unit segments (220) arranged opposite to each other. Each first unit segment (210) and each second unit segment (220) are connected in an alternating manner. The width of the first unit segment (210) is greater than the width of the second unit segment (220). The two ends of the connecting segment (230) are respectively connected to the two first unit segments (210).

5. A multi-system access platform, characterized in that, include: At least one combiner and a broadband filter according to any one of claims 1-4, wherein the combiner is used to receive and process a signal source, and the broadband filter is used to process the output signal of the combiner.

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