Broadband filtering device and multi-system access platform

Abstract

The invention provides a broadband filtering device and a multi-system access platform, and relates to the technical field of multi-system access platforms, and the broadband filtering device comprises a dielectric substrate; the resonator is arranged on the surface of the dielectric substrate; and the plurality of input units are wound on the resonator, each input unit comprises a first coupling line, a second coupling line and an input piece which are 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. According to the broadband filtering device and the multi-system access platform provided by the invention, the problem that the bandwidth is relatively narrow when a filtering device works in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of multi-system access platforms, and in particular to a broadband filtering device and a multi-system access platform. Background Art

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

[0003] In related technologies, a filtering device includes a dielectric substrate and a bridge disposed on the upper surface of the dielectric substrate. The bridge typically employs an odd-even mode crossover structure, a crossover bridge design based on odd-even mode analysis. This bridge transmits energy diagonally, utilizing the 180° phase difference between odd and even modes to isolate signal paths.

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

[0005] The present application provides a broadband filtering device and a multi-system access platform to solve the problem of narrow bandwidth of the filtering device during operation in the prior art.

[0006] In one aspect, the present application provides a broadband filtering device, comprising:

[0007] dielectric substrate;

[0008] a resonator, the resonator being disposed on a surface of the dielectric substrate;

[0009] Multiple input units are arranged around the resonator, each input unit includes a first coupling line, a second coupling line, and an input component provided on the surface of the dielectric substrate, the first coupling line and the second coupling line are both connected to the input component, the first coupling line and the second coupling line are both coupled to the resonator, and the input component is used to input an electrical signal.

[0010] In a possible implementation, in the same input unit, an extension direction of the first coupling line and an extension direction of the second coupling line are arranged at an angle, and the first coupling line and the second coupling line are correspondingly distributed on two adjacent sides of the resonator.

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

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

[0013] In a possible implementation manner, any one of the first coupling line and the second coupling line is connected to a short-circuit element, the short-circuit element is used for grounding, and the short-circuit element is spaced apart from the short-circuit element on the adjacent input unit.

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

[0015] In a possible implementation manner, a grounding through-hole is provided on the short-circuit element, and the short-circuit element is electrically connected to the second metal layer through the grounding through-hole.

[0016] In a possible implementation, the resonator is a ring microstrip resonator, and a connecting section is provided on an inner side of the resonator, where the connecting section connects two opposite ends of the ring microstrip resonator.

[0017] In a possible implementation manner, the connecting section extends along a curved track, so that the length of the connecting section is greater than the distance between the two ends of the annular microstrip resonator connected to the connecting section;

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

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

[0020] The present application provides a broadband filtering device and a multi-system access platform, wherein the broadband filtering device includes: a dielectric substrate; a resonator, the resonator being disposed on the surface of the dielectric substrate; and multiple input units, the multiple input units being wound around the resonator. The input units include a first coupling line, a second coupling line, and an input component disposed on the surface of the dielectric substrate, the first coupling line and the second coupling line being connected to the input component, the first coupling line and the second coupling line being coupled to the resonator, and the input component being used to input electrical signals. Thus, during operation, electrical signals are transmitted from the input components on each input unit to the first coupling line and the second coupling line, and then transmitted to the resonator through enhanced coupling, causing the resonator to generate a radiated signal externally. This in turn 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, thereby resolving the problem of narrow bandwidth of the filtering device during operation in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] Figure 1 A schematic structural diagram of a broadband filtering device provided in an embodiment of the present application;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the first metal layer;

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

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

[0026] Description of reference numerals:

[0027] 100- dielectric substrate;

[0028] 200-resonator;

[0029] 210- first unit segment;

[0030] 220-Second unit section;

[0031] 230-connecting section;

[0032] 300-input unit;

[0033] 310-first coupling line;

[0034] 320-second coupling line;

[0035] 330-input parts;

[0036] 400-short circuit piece;

[0037] 410-The first short-circuit branch;

[0038] 420-Second short-circuit branch;

[0039] 430-ground via;

[0040] 500 - second metal layer.

[0041] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0043] In related technologies, multi-system access platforms (POIs) are primarily used for multi-band, multi-signal combining to achieve compatible coverage of multiple network signals. Filtering devices are key components of these platforms. These filtering devices consist of a dielectric substrate and a bridge mounted on its upper surface. The bridge typically employs an even-odds-mode crossover structure, a cross-wire bridge design based on odd-even mode analysis. This design utilizes diagonal energy transmission and utilizes the 180° phase difference between odd and even modes to isolate signal paths.

[0044] However, although the above-mentioned filter device has advantages such as small size and easy processing, the bandwidth of the filter device during operation is relatively narrow.

[0045] Thus, an embodiment of the present application provides a broadband filtering device and a multi-system access platform, wherein the broadband filtering device includes: a dielectric substrate; a resonator, the resonator being disposed on the surface of the dielectric substrate; a plurality of input units, the plurality of input units being wound around the resonator, the input units including a first coupling line, a second coupling line, and an input component disposed on the surface of the dielectric substrate, the first coupling line and the second coupling line being connected to the input component, the first coupling line and the second coupling line being coupled to the resonator, and the input component being used to input electrical signals. Thus, during operation, electrical signals are transmitted from the input components on each input unit to the first coupling line and the second coupling line, and then transmitted to the resonator through enhanced coupling, causing the resonator to generate a radiated signal externally. This in turn 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 of the filtering device during operation in the prior art.

[0046] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0047] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a broadband filtering device, comprising:

[0048] Dielectric substrate 100;

[0049] The resonator 200 is configured to be disposed on the surface of the dielectric substrate 100;

[0050] A plurality of input units 300 , wherein the plurality of 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, which are arranged 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 filter device includes a first metal layer disposed on the upper surface of a dielectric substrate 100. The first metal layer includes a resonator 200 and multiple input units 300. The resonator 200 and each input unit 300 are disposed on the upper surface of the dielectric substrate 100. Furthermore, each input unit 300 is wound around the resonator 200.

[0053] The number of input units 300 may be two, four, six, eight, or any other number, without limitation. In this embodiment, four input units 300 are used as an example. The resonator 200 may be a ring microstrip resonator, a patch resonator, or any other type 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 . The first coupling line 310 , the second coupling line 320 and the input element 330 are all disposed on the upper surface of the dielectric substrate 100 .

[0055] Specifically, one end of the input member 330 extends to the edge of the dielectric substrate 100, and the first coupling line 310 and the second coupling line 320 are both connected to the other end of the input member 330. This allows an electrical signal to be input from the input member 330 and then transmitted through the input member 330 to the first coupling line 310 and the second coupling line 320. The first coupling line 310 and the second coupling line 320 are both 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, without limitation. 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 device 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 is transmitted to the resonator 200 through enhanced coupling, so that the resonator 200 generates a radiation signal to the outside; thereby, the electromagnetic field coupling strength is directionally enhanced, the energy transmission efficiency is optimized, the basic path for wide-band signal transmission is formed, and the bandwidth of the filter device during operation is increased, thereby solving the problem of narrow bandwidth of the filter device during operation in the prior art.

[0058] It should be noted that the material of the dielectric substrate 100 is not limited, and examples include ceramic substrates, epoxy resin substrates, and polytetrafluoroethylene substrates. The first metal layer can be made of copper, aluminum, or other metals. The resonator 200, first coupling line 310, second coupling line 320, and input element 330 can all be secured to the top surface of the dielectric substrate 100 by bonding, welding, or other methods.

[0059] In addition, it is supplemented that when the dielectric substrate 100 is designed with different plate materials, the device structural 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. The inner side of the resonator 200 has a connecting section 230, and the connecting section 230 connects two opposite ends of the ring microstrip resonator.

[0061] Therefore, by coupling the annular microstrip resonator with the first coupling line 310 and the second coupling line 320, the resonance characteristics of the closed loop can be used to excite multi-mode transmission poles, and the passband range can be expanded through the frequency superposition effect of the poles, thereby avoiding the insertion loss accumulation problem of traditional cascade filters and reducing losses.

[0062] Furthermore, the annular microstrip resonator includes two first unit segments 210 and two second unit segments 220 that are arranged opposite to each other, each first unit segment 210 is connected to each second unit segment 220 in an alternating manner, the width of the first unit segment 210 is greater than the width of the second unit segment 220, and the two ends of the connecting segment 230 are respectively connected to the two first unit segments 210.

[0063] Thus, during operation, the first unit segment 210 and the second unit segment 220 of different widths correspond to different equivalent electrical lengths and current distributions, thereby exciting multiple resonant modes. Furthermore, the connecting segment 230 widens the impedance bandwidth near the resonance point through coupling, thereby achieving dual-band / multi-band operation and extending bandwidth.

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

[0065] The connection section 230 is designed in this way, so that the length of the connection section 230 can be increased within the limited space of the ring microstrip resonator, thereby increasing the equivalent electrical length, enabling the filtering device to achieve a wide bandwidth, and facilitating miniaturization.

[0066] In implementation, for example, each first unit segment 210, each second unit segment 220, and the connecting segment 230 can be integrally formed to form an integral ring microstrip resonator. Alternatively, the first unit segment 210 and the second unit segment 220, or the first unit segment 210 and the connecting segment 230, can be connected 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 and the extension direction of the second coupling line 320 are set at an angle, and the first coupling line 310 and the second coupling line 320 are correspondingly distributed on two adjacent sides of the resonator 200 .

[0068] The first coupling lines 310 are symmetrically distributed on two opposite sides of the resonator 200 , and the second coupling lines 320 are symmetrically distributed on two other opposite sides of the resonator 200 .

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

[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 first coupling line 310 is symmetrically distributed on both sides of the resonator 200 corresponding to the first unit segment 210; each second coupling line 320 is symmetrically distributed on both sides of the resonator 200 corresponding to the second unit segment 220.

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

[0073] Similar to the first coupling lines 310, two second coupling lines 320 are symmetrically distributed and correspond to the second unit segments 220 on one side of the resonator 200; the other two second coupling lines 320 are symmetrically distributed and correspond to the second unit segments 220 on the other side of the resonator 200. Furthermore, the two second coupling lines 320 are also symmetrically distributed with respect to 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 form a Y-shaped microstrip coupling structure. Furthermore, a nested coupling structure is formed between the resonator 200 and each of the first coupling line 310 and the second coupling line 320 .

[0075] Thus, when the filter device is operating, an 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, through enhanced coupling, to the resonator 200, causing the resonator 200 to generate a radiated 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 is increased, thereby improving coupling efficiency and helping to expand the bandwidth of the resonator 200. At the same time, the symmetry of the coupled signals 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] Thus, during operation, the first coupling line 310 facilitates adaptation to low-frequency resonance, while the second coupling line 320 facilitates adaptation to 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 of different widths, dual-frequency or multi-frequency response is achieved, while also enabling the filter device to have a wider operating bandwidth.

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

[0079] Thus, during operation of the filter device, the short-circuit element 400 can increase the zero point and improve out-of-band selectivity. Furthermore, the short-circuit element 400 is spaced apart from the short-circuit element 400 on the adjacent input unit 300 to ensure that there is no coupling between the two adjacent short-circuit elements 400, thereby helping to reduce interference and crosstalk and ensuring that the signal transmission of each first coupling line 310 is more independent and stable.

[0080] During implementation, for example, the short-circuit element 400 may be connected to the first coupling line 310 by integral molding, welding, or other means; the short-circuit element 400 may 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 may be disposed on the upper surface of the dielectric substrate 100 , and the short-circuit element 400 may be bonded to the dielectric substrate 100 .

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

[0083] A grounding through-hole 430 is defined in the short-circuit element 400 , and the short-circuit element 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 methods. During implementation, the second metal layer 500 is directly or indirectly grounded through a wire.

[0085] The short-circuit element 400 is connected to the first coupling line 310 . A grounding through-hole 430 is defined in the short-circuit element 400 . The short-circuit element 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 branch, and the short-circuit element 400 includes an integrally formed first short-circuit branch 410 and a second short-circuit branch 420. One end of the first short-circuit branch 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 branch 410 is connected to one end of the second short-circuit branch 420.

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

[0088] In this embodiment, a single grounding via 430 is provided on the short-circuit element 400. The grounding via 430 is a metalized through-hole and is located at the end of the second short-circuit branch 420 away from the first short-circuit branch 410. This allows the short-circuit element 400 on the second coupling line 320 to pass through the short-circuit element 400, which is grounded via the grounding via 430 and the second metal layer 500, thereby improving the out-of-band selectivity of the filtering 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, a gap is provided between the first short-circuit branch 410 on one first coupling line 310 and the first short-circuit branch 410 on the other first coupling line 310 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 general, the broadband filtering device of this multi-system access platform can achieve performance breakthroughs through multi-level structure collaborative design.

[0092] For example, the core coupling layer comprises a Y-shaped microstrip coupling structure formed by an input element 330, a first coupling line 310, and a second coupling line 320. The symmetrical branch layout optimizes energy transmission efficiency at the physical level through directional enhancement of electromagnetic field coupling strength, thereby forming a basic path for wideband 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 multi-modal transmission poles. The passband range is expanded through the frequency superposition effect of the poles, avoiding the insertion loss accumulation problem of traditional cascade filters.

[0094] Out-of-band suppression layer: Through the integrated design of short-circuit branches and ring microstrip resonators, the high-frequency short-circuit effect is used to directionally absorb out-of-band stray energy. Combined with the inherent frequency selection characteristics of the resonant unit, a steep roll-off of the passband edge and deep suppression of out-of-band signals are achieved.

[0095] Isolation Optimization Layer: Based on the odd- and even-mode equivalent circuit model, this layer adjusts the impedance matching relationship at the coupling node to achieve reverse phase cancellation of odd-mode signals at the isolated port. It also utilizes the in-phase superposition of even-mode signals to strengthen the transmission link, thereby achieving dynamic energy balance and isolation between ports over a wide frequency range.

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

[0097] like Figure 2 and Figure 3 As shown in Figure 1, the transmission and reflection characteristics of the RF network between different ports are characterized by S parameters to reflect the performance of the filtering device. Figure 3 Where |S11| represents the ratio of the signal reflected from port 1 to the signal input to port 1, |S33| represents the ratio of the signal reflected from port 3 to the signal input to port 3; |S21| represents the ratio of the signal transmitted from port 1 to port 2 through the network to the signal input to port 1, |S43| represents the ratio of the signal transmitted from port 3 to port 4 through the network to the signal input to port 3; |S41| represents the ratio of the signal transmitted from port 1 to port 4 through the network to the signal input to port 1, |S32| represents the ratio of the signal transmitted from port 2 to port 3 through the network to the signal input to port 2; |S31| represents the ratio of the signal transmitted from port 1 to port 3 through the network to the signal input to port 1, |S42| represents the ratio of the signal transmitted from port 2 to port 4 through the network to the signal input to port 2.

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

[0099] In summary, the embodiment of the present application provides a broadband filtering device. When in operation, an 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 is transmitted to the resonator 200 through enhanced coupling, so that the resonator 200 generates a radiation signal to the outside; thereby directionally enhancing the electromagnetic field coupling strength, optimizing the energy transmission efficiency, forming a basic path for broadband signal transmission, and increasing the bandwidth of the filtering device when in operation, thereby solving the problem of narrow bandwidth of the filtering device when in operation in the prior art.

[0100] An embodiment of the present application provides a multi-system access platform, comprising: at least one combiner and the broadband filtering device of any of the above embodiments, wherein the combiner is used to receive and process a signal source, and the broadband filtering device is used to process an output signal of the combiner.

[0101] like Figure 4 As shown, in this embodiment, a plurality of combiners can be provided, and at least some of them are heterofrequency combiners. The heterofrequency combiner, the broadband filtering device and the combiner are electrically connected in sequence. The heterofrequency combiner is used to receive and process the signal source, and the broadband filtering device can process the output signal of the heterofrequency combiner, and then pass the output signal to the combiner. Subsequently, output ports ANT1 and ANT2 can be provided on the combiner to output the signal through ANT1 or ANT2; of course, other numbers of output ports can also be provided, and there is no limitation on this. Among them, the broadband filtering device also plays a role in signal isolation and crosstalk suppression.

[0102] During implementation, the different frequency combiner can be electrically connected or coupled to the input element 330 in the broadband filtering device.

[0103] During operation, the output signal of the heterodyne 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, causing the resonator 200 to generate a radiation signal externally; thereby, the electromagnetic field coupling strength is directionally enhanced, the energy transmission efficiency is optimized, a basic path for wide-band signal transmission is formed, and the bandwidth of the filter device during operation is increased, thereby solving the problem of narrow bandwidth of the filter device during operation in the prior art.

[0104] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A broadband filtering device, characterized in that: include: a dielectric substrate (100); a resonator (200), the resonator (200) being arranged on the surface of the dielectric substrate (100); A plurality of input units (300) are provided, wherein the plurality of input units (300) are arranged around the resonator (200), the input unit (300) comprises a first coupling line (310), a second coupling line (320), and an input component (330) provided 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 component (330), the first coupling line (310) and the second coupling line (320) are both coupled to the resonator (200), and the input component (330) is used for inputting an electrical signal.

2. The broadband filtering device according to claim 1, wherein In the same input unit (300), the extension direction of the first coupling line (310) and the extension direction of the second coupling line (320) are arranged at an angle, and the first coupling line (310) and the second coupling line (320) are correspondingly distributed on two adjacent sides of the resonator (200).

3. The broadband filtering device according to claim 2, characterized in that: The width of the first coupling line (310) is greater than the width of the second coupling line (320).

4. The broadband filtering device according to claim 3, characterized in that: Each of the first coupling lines (310) is symmetrically distributed on two opposite sides of the resonator (200), and each of the second coupling lines (320) is symmetrically distributed on the other two opposite sides of the resonator (200).

5. The broadband filtering device according to any one of claims 1 to 4, characterized in that: Any one of the first coupling line (310) and the second coupling line (320) is connected to a short-circuit component (400), the short-circuit component (400) is used for grounding, and the short-circuit component (400) is spaced apart from the short-circuit component (400) on the adjacent input unit (300).

6. The broadband filtering device according to claim 5, characterized in that: It also includes a second metal layer (500), which is arranged on the dielectric substrate (100), the second metal layer (500) is used for grounding, and the short-circuit element (400) is electrically connected to the second metal layer (500).

7. The broadband filtering device according to claim 6, characterized in that: A grounding through hole (430) is provided on the short-circuit component (400), and the short-circuit component (400) is electrically connected to the second metal layer (500) through the grounding through hole (430).

8. The broadband filtering device according to any one of claims 1 to 4, characterized in that: The resonator (200) is a ring-shaped microstrip resonator. The inner side of the resonator (200) is provided with a connecting section (230), and the connecting section (230) connects two opposite ends of the ring-shaped microstrip resonator.

9. The broadband filtering device according to claim 8, characterized in that: The connecting section (230) extends along a curved track, so that the length of the connecting section (230) is greater than the distance between the two ends of the annular microstrip resonator connected to the connecting section (230); And / or, the annular microstrip resonator comprises two first unit segments (210) and two second unit segments (220) arranged opposite to each other, each of the first unit segments (210) and each of the second unit segments (220) are sequentially staggered and connected, the width of the first unit segment (210) is greater than the width of the second unit segment (220), and the two ends of the connecting segment (230) are respectively connected to the two first unit segments (210).

10. A multi-system access platform, characterized in that: include: At least one combiner and the broadband filtering device according to any one of claims 1 to 9, wherein the combiner is used to receive and process a signal source, and the broadband filtering device is used to process an output signal of the combiner.

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