Microwave RF circuits and communication equipment

Abstract

The present application discloses a microwave radio frequency circuit and communication equipment, wherein the microwave radio frequency circuit includes a signal transmission structure and a filtering structure; the signal transmission structure includes a first open ring, an input end for receiving a signal to be transmitted, and an output end for outputting the signal to be transmitted, and the gap between the input end and the output end forms the opening of the first open ring; the filtering structure is coupled to at least one side of the signal transmission structure, and is insulated from the signal transmission structure, and is used to filter out interference signals of at least one preset frequency band. The present application can filter out interference signals of at least one preset frequency band during the process of the signal transmission structure transmitting the signal to be transmitted, and does not cause loss to the effective signal of the working frequency band, and can improve the working performance of the microwave radio frequency circuit.

Description

Technical Field

[0001] The present application relates to the technical field of radio frequency circuits, and in particular to a microwave radio frequency circuit and communication equipment. Background Art

[0002] Radio frequency filters can filter out interference signals in specific frequency bands (such as adjacent frequency bands, etc.) in signals transmitted by microwave radio frequency circuits, and play an important supporting role in maintaining the working performance of microwave radio frequency circuits. When studying microwave radio frequency circuits, the inventors found that some radio frequency filter circuits often use a grounded inductor and capacitor series structure or an inductor and capacitor blocking parallel structure to filter out interference signals in specific frequency bands, such as high-order harmonics, etc. However, the above-mentioned radio frequency filter structure also has a certain degree of influence on the signal in the working frequency band, which is easy to increase the loss of the signal in the working frequency band. Summary of the invention

[0003] In view of this, the present application provides a microwave radio frequency circuit and communication equipment to solve the problem that the traditional radio frequency filtering structure has a certain degree of influence on the signal in the working frequency band, which easily increases the signal loss in the working frequency band.

[0004] The present application provides a microwave radio frequency circuit, wherein the microwave radio frequency circuit includes a signal transmission structure and a filtering structure;

[0005] The signal transmission structure comprises a first open ring, an input end for receiving a signal to be transmitted and an output end for outputting the signal to be transmitted, and a gap between the input end and the output end forms an opening of the first open ring;

[0006] The filtering structure is coupled to at least one side of the signal transmission structure and is insulated from the signal transmission structure, and is used to filter out interference signals in at least one preset frequency band.

[0007] Optionally, the filtering structure includes at least one resonant ring filter; the resonant ring filter is coupled to a first surface and / or a second surface of the signal transmission structure, and the first surface and the second surface are two opposite surfaces of the signal transmission structure.

[0008] Optionally, the resonant ring filter includes a capacitor and a second open ring; the second open ring is consistent in direction with the first open ring and is coupled to at least one side of the first open ring; the capacitor is arranged at the opening of the second open ring, respectively connected to the two ends of the second open ring, and forms a ring resonant cavity with the second open ring.

[0009] Optionally, the second open ring provides an inductance with a parameter of L, and the parameter of the capacitance is C; the resonant frequency of the resonant ring filter is: 1 / a*L*C, where 1 / a is the resonance constant.

[0010] Optionally, a coupling length between the second open ring and the signal transmission structure is used to determine a suppression strength of a corresponding interference signal.

[0011] Optionally, the distance between the second open ring and the signal transmission structure is used to determine the suppression strength of the corresponding interference signal.

[0012] Optionally, the microwave radio frequency circuit further includes a dielectric layer; the dielectric layer is disposed between the second open ring and the signal transmission structure, and is used to maintain insulation between the second open ring and the signal transmission structure.

[0013] Optionally, the filtering structure includes a first resonant ring filter and a second resonant ring filter; the first resonant ring filter is coupled to the first surface of the signal transmission structure, and the resonant frequency is a first resonant frequency, and the first resonant frequency matches a first frequency band corresponding to the interference signal; the second resonant ring filter is coupled to the second surface of the signal transmission structure, and the resonant frequency is a second resonant frequency, and the second resonant frequency matches a second frequency band corresponding to the interference signal.

[0014] Optionally, the shape of the signal transmission structure includes any one of a rectangular shape, a circular shape, an elliptical shape and a racetrack shape.

[0015] The present application also provides a communication device, which includes any one of the above-mentioned microwave radio frequency circuits.

[0016] In the above-mentioned microwave radio frequency circuit and communication equipment of the present application, the filtering structure is coupled to at least one side of the signal transmission structure and is insulated from the signal transmission structure, so as to filter out interference signals of at least one preset frequency band during the process of the signal transmission structure transmitting the signal to be transmitted, and does not cause loss to the effective signal of the working frequency band, thereby improving the working performance of the microwave radio frequency circuit.

[0017] The above-mentioned filtering structure includes at least one resonant ring filter. The capacitor in the resonant ring filter and the corresponding second open ring can form a ring resonant cavity to filter out interference signals in the corresponding frequency band. Since the ring resonant cavity has good frequency selectivity and a very high Q value (Q value is also called quality factor, which is an important parameter for measuring the quality factor of the resonant system and reflects the energy storage and dissipation capacity of the system), that is, the ring resonant cavity has low loss at non-resonant frequencies. Therefore, the above-mentioned filtering structure has little effect on the effective signal corresponding to the working frequency while filtering out the interference signal, which can reduce the loss caused to the effective signal, thereby further improving the working performance of the above-mentioned microwave radio frequency circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the structure of a microwave radio frequency circuit according to an embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of the structure of a microwave radio frequency circuit according to an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the structure of a microwave radio frequency circuit of another embodiment of the present application;

[0022] Figure 4 is an equivalent circuit diagram corresponding to the microwave radio frequency circuit structure in one embodiment of the present application;

[0023] Figure 5 is an equivalent circuit diagram corresponding to the microwave radio frequency circuit structure in another embodiment of the present application;

[0024] Figure 6 is a cross-sectional view of a partial structure of a microwave radio frequency circuit in an embodiment of the present application;

[0025] Figure 7 is a schematic diagram of the structure of a microwave radio frequency circuit of another embodiment of the present application;

[0026] Figure 8 yes Figure 7 The equivalent circuit diagram corresponding to the microwave RF circuit shown. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0028] In a first aspect, the present application provides a microwave radio frequency circuit, which can be used to transmit a microwave signal and wait for a transmission signal. The microwave radio frequency circuit includes a signal transmission structure 110 and a filtering structure 120 .

[0029] refer to Figure 1As shown, the signal transmission structure 110 includes a first open ring, an input end P1 for receiving a signal to be transmitted, and an output end P2 for outputting the signal to be transmitted. The gap between the input end P1 and the output end P2 forms an opening 111 (also referred to as a gap) of the first open ring. The opening 111 forms the signal transmission structure 110 in an open ring shape (i.e., a first open ring). The shape of the first open ring includes a rectangle (e.g. Figure 1 As shown), any one of a circle, an ellipse and a racetrack. Optionally, the shape of the first open ring includes a shape with a relatively large area, such as a circular open ring, etc.

[0030] Alternatively, if Figure 1 As shown, the signal transmission structure 110 includes an annular main body portion 112 and a port portion 113, the annular main body portion 112 forms a first open ring, and the port portion 113 is located at both ends of the annular main body portion 112 and extends outward to form an input terminal P1 and an output terminal P2 respectively; wherein the shape of the port portion 113 after extension is not specifically limited in the embodiment of the present application, and the shape can be determined according to the layout characteristics and / or relevant process characteristics of the corresponding chip; in some examples, the port portion 113 can be in a straight line shape (such as Figure 1 As shown), in some other examples, the port portion 113 may also be in a broken line shape, and in other examples, the port portion 113 may also be in a curved line shape.

[0031] The filter structure 120 is coupled to at least one side of the signal transmission structure 110. For example, the filter structure 120 can be coupled to the upper and lower sides of the annular main body 112 in the signal transmission structure 110. Figure 2 As shown, the filter structure 120 is coupled to the annular main body 112 in the signal transmission structure 110. The filter structure 120 and the signal transmission structure 110 are insulated from each other to avoid interfering with the signal transmission structure 110 transmitting the signal to be transmitted. The filter structure 120 is used to filter out interference signals of at least one preset frequency band, and does not cause loss to the effective signal of the working frequency band, so as to improve the working performance of the microwave radio frequency circuit.

[0032] Optionally, the preset frequency band corresponding to the interference signal is determined based on factors such as the working environment of the microwave radio frequency circuit; specifically, the preset frequency band includes one or two frequency bands near the working frequency band of the microwave radio frequency circuit.

[0033] In some embodiments, the filtering structure 120 includes at least one resonant ring filter; the resonant ring filter is coupled to the first side and / or the second side of the signal transmission structure 110, and the first side and the second side are two opposite sides of the signal transmission structure, for example, the first side of the signal transmission structure 110 is above it, and the second side of the signal transmission structure 110 is below it.

[0034] Specifically, refer to Figure 3 As shown, the resonant ring filter includes a capacitor C and a second open ring, and the second open ring is in the same direction as the first open ring to enhance the coupling degree between the second open ring and the signal transmission structure 110, and strengthen the filtering function of the resonant ring filter; specifically, the resonant ring filter can form an inductor / capacitor series circuit structure through the open ring, and the ring can increase the inductor magnetic flux to enhance the coupling strength between the coupling structures. In addition, the thickness of the dielectric layer between the first open ring and the second open ring can also be reduced, or the dielectric constant of the dielectric layer can be increased to enhance the coupling strength and thus enhance the filtering function. This design is fully compatible with the semiconductor circuit planar process, and only the process parameters need to be adjusted to adjust the final filtering function, with the characteristics of low cost and simple structure. Specifically, the same direction includes the same shape and / or close size; for example, the second open ring is in the same shape as the first open ring (i.e., the annular main body 112 in the signal transmission structure 110), if the first open ring is rectangular, then the second open ring is rectangular, if the first open ring is circular, then the second open ring is circular, and so on. Specifically, the second open ring can be coupled to at least one side of the first open ring, for example, the second open ring can be coupled to the first side or the second side of the first open ring, and for example, the second open ring is coupled to the first side and the second side of the first open ring respectively. Optionally, the second open ring is coupled to one side of the first open ring, including the second open ring being coupled to one side of the first open ring through a corresponding dielectric layer.

[0035] The second open ring can provide the function of an inductor L during operation, which can be recorded as L. The capacitor C is arranged at the opening of the second open ring L, and is respectively connected to the two ends of the second open ring L, for example, the first end of the capacitor C is connected to the first end of the second open ring L, and the second end of the capacitor C is connected to the second end of the second open ring L; the capacitor C and the corresponding second open ring L can form a ring resonant cavity to filter out interference signals of the corresponding frequency band.

[0036] Optionally, the signal transmission structure 110 can provide a corresponding inductance function during the signal transmission process, and the provided inductance can be recorded as L1. If the second open ring L is provided on the first surface (e.g., the top) of the signal transmission structure 110, an inductance L2 can be provided, and the corresponding capacitor C is recorded as C2. In this case, the equivalent circuit diagram of the resonant ring filter can be referred to Figure 4 If the second open ring L is disposed on the second surface (eg, below) of the signal transmission structure 110, an inductor L3 may be provided, and the corresponding capacitor C is recorded as C3. At this time, the equivalent circuit diagram of the resonant ring filter may refer to Figure 5 shown.

[0037] In some examples, capacitor C may be a separate capacitor device; in other examples, capacitor C may also be a MIM capacitor (i.e., metal-insulator-metal capacitor) formed by relatively disposed metal sheets. For example, capacitor C may include two relatively disposed metal sheets and a dielectric layer located between the metal sheets.

[0038] Specifically, the second open ring L provides an inductor with a parameter of L, and the parameter of the capacitor C is C; the resonant frequency of the resonant ring filter is: 1 / a*L*C, where 1 / a is a resonance constant. The resonant ring filter can be used to filter out interference signals whose frequency band is its resonant frequency 1 / a*L*C or whose frequency band is near its resonant frequency 1 / a*L*C. Therefore, by adjusting the parameters of the inductor L and / or the capacitor C provided by the second open ring L, the resonant frequency of the resonant ring filter can be adjusted, and then the frequency band corresponding to the interference signal to be filtered out can be set. Specifically, adjusting the parameters of the inductor L and / or the capacitor C provided by the second open ring L may include: adjusting the parameters of the inductor L2 and / or the capacitor C2 located on the first surface of the second open ring L, and / or adjusting the parameters of the inductor L3 and / or the capacitor C3 located on the second surface of the second open ring L.

[0039] Specifically, the coupling length between the second open ring L and the signal transmission structure 110 is used to determine the suppression strength of the corresponding interference signal, so the suppression strength of the interference signal in the preset frequency band can be adjusted by controlling the coupling length between the second open ring L and the signal transmission structure 110, thereby improving the controllability of the interference signal suppression process. Optionally, the coupling length between the second open ring L and the signal transmission structure 110 includes the sum of the coupling lengths of the second open ring L on each side of the signal transmission structure 110. In some examples, the entire second open ring L is coupled to the annular main body 112 of the signal transmission structure 110, and the coupling length between the second open ring L and the signal transmission structure 110 is the total length of the second open ring L.

[0040] Specifically, the spacing between the second open ring L and the signal transmission structure 110 is used to determine the suppression strength of the corresponding interference signal, so the suppression strength of the interference signal in the preset frequency band can be determined by designing the spacing between the second open ring L and the signal transmission structure 110, thereby improving the controllability of the interference signal suppression process. Optionally, the spacing between the second open ring L and the signal transmission structure 110 may include the thickness of the dielectric layer provided between the second open ring L and the signal transmission structure 110.

[0041] In some examples, if the filtering structure 120 only needs to filter out interference signals in a frequency band, the filtering structure 120 includes a resonant ring filter whose resonant frequency is equal to the center frequency of the frequency band of the interference signal to be filtered out, so as to improve the filtering effect of the corresponding resonant ring filter.

[0042] In some examples, the filter structure 120 only needs to filter out interference signals in two frequency bands, for example, the preset frequency band includes a first frequency band and a second frequency band; the center frequency of the first frequency band is f2 or the first frequency band includes the frequency point f2; the center frequency of the second frequency band is f3 or the second frequency band includes the frequency point f3. In this case, the filter structure 120 includes a first resonant ring filter 121 and a second resonant ring filter 122, for example, Figure 6 As shown, the first resonant ring filter 121 is disposed on the first surface of the signal transmission structure 110, and the second resonant ring filter 122 is disposed on the second surface of the signal transmission structure 110. Furthermore, a first dielectric layer 131 may be disposed between the first resonant ring filter 121 and the signal transmission structure 110, and a second dielectric layer 132 may be disposed between the second resonant ring filter 122 and the signal transmission structure 110.

[0043] The first resonant ring filter 121 is coupled to the first surface of the signal transmission structure 110; the resonant frequency of the first resonant ring filter 121 is a first resonant frequency f2, and the first resonant frequency f2 matches the first frequency band corresponding to the interference signal. Figure 7 and Figure 8 As shown, Figure 7 This is a top view of the microwave radio frequency circuit on the corresponding chip. Figure 8 for Figure 7 As shown in the equivalent circuit diagram of the microwave radio frequency circuit, the first resonant ring filter 121 includes a first capacitor C2 and a corresponding second open ring, and the second open ring can form a first inductor L2; the first capacitor C2 and the first inductor L2 can form a first ring resonant cavity, and the first resonant frequency of the first ring resonant cavity is 1 / a*L2*C2.

[0044] The second resonant ring filter coupling 122 is on the second side of the signal transmission structure 110; the resonant frequency of the second resonant ring filter coupling 122 is the second resonant frequency f3, and the second resonant frequency f3 matches the second frequency band corresponding to the interference signal. Figure 7 and Figure 8 As shown, the second resonant ring filter coupling 122 includes a second capacitor C3 and a corresponding second open ring, and the second open ring can form a second inductor L2; the second capacitor C3 and the second inductor L3 can form a second ring resonant cavity, and the second resonant frequency of the second ring resonant cavity is 1 / a*L3*C3.

[0045] like Figure 8 As shown, the signal transmission structure 110 can form a signal transmission inductor L1.

[0046] The operating frequency of the signal transmission structure 110 is f1, that is, the frequency of the effective signal in the signal to be transmitted is f1, and the interference signal corresponding to the first resonant frequency f2 and the interference signal corresponding to the second resonant frequency f3 need to be filtered out. The signal to be transmitted is transmitted from its input end P1 to its output end P2 through the signal transmission inductor L1.

[0047] The first capacitor C2 and the first inductor L2 form a first annular resonant cavity, and the corresponding first resonant frequency is 1 / a*L2*C2. The parameters corresponding to the first capacitor C2 and / or the first inductor L2 are adjusted so that the first resonant frequency is equal to the frequency f2 corresponding to the first frequency band that needs to be filtered out. When the signal to be transmitted flows through the signal transmission inductor L1, a part of the signal to be transmitted will be coupled to the first inductor L2, and due to the existence of the first annular resonant cavity, the first annular resonant cavity can form a strong electromagnetic field distribution in the corresponding ring, and interfere with the signal of the f2 frequency in the signal transmission inductor L1, so that the signal of the f2 frequency is eliminated. At this time, the gain from the input terminal P1 to the output terminal P2 will form a valley at the f2 frequency point, that is, the signal of the f2 frequency is filtered out.

[0048] The second capacitor C3 and the second inductor L3 form a second annular resonant cavity, and the corresponding second resonant frequency is 1 / a*L3*C3. The parameters corresponding to the first capacitor C3 and / or the first inductor L3 are adjusted so that the second resonant frequency is equal to the frequency f3 corresponding to the second frequency band that needs to be filtered out. When the signal to be transmitted flows through the signal transmission inductor L1, a part of the signal to be transmitted will be coupled to the second inductor L3, and due to the existence of the second annular resonant cavity, the second annular resonant cavity can form a strong electromagnetic field distribution in the corresponding ring, and interfere with the signal of the f3 frequency in the signal transmission inductor L1, so that the signal of the f3 frequency is eliminated. At this time, the gain from the input terminal P1 to the output terminal P2 will form a valley at the f3 frequency point, that is, the signal of the f3 frequency is filtered out.

[0049] Therefore, each ring resonant cavity included in the above-mentioned filtering structure 120 can filter out the corresponding interference signal respectively, so that the filtering structure 120 can filter out the interference signal of the preset frequency band. Since the ring resonant cavity has good frequency selectivity and a high Q value (Q value is also called quality factor, which is an important parameter for measuring the quality factor of the resonant system and reflects the energy storage and dissipation capacity of the system), that is, the ring resonant cavity has low loss to non-resonant frequency, the above-mentioned filtering structure 120 has little effect on the effective signal corresponding to the working frequency f1.

[0050] Furthermore, the coupling length and / or spacing between the second open ring L and the signal transmission structure 110 can determine the suppression strength of the corresponding interference signal. Therefore, the suppression strength of the corresponding resonant ring filter to the interference signal can be controlled by controlling the length of the coupling part between the second open ring and the signal transmission structure 110, and / or the spacing between the second open ring and the signal transmission structure 110.

[0051] In some embodiments, the microwave radio frequency circuit also includes a dielectric layer (not shown in the figure); the dielectric layer is arranged between the second open ring L and the signal transmission structure 110, for example, the dielectric layer can be arranged between the second open ring L and the first open ring; the dielectric layer is used to maintain insulation between the second open ring L and the signal transmission structure 110.

[0052] Specifically, the filtering structure 120 includes a first resonant ring filter 121 and a second resonant ring filter 122, and the microwave radio frequency circuit may include a first dielectric layer and a second dielectric layer; the first dielectric layer is arranged between the first open ring and the second open ring located on one side of the first open ring, and the second dielectric layer is arranged between the first open ring and the second open ring located on the other side of the first open ring.

[0053] In the above microwave RF circuit, the filtering structure 120 is coupled to at least one side of the signal transmission structure 110 and is insulated from the signal transmission structure 110, so as to filter out interference signals of at least one preset frequency band during the process of the signal transmission structure 110 transmitting the signal to be transmitted, and does not cause loss to the effective signal of the working frequency band, thereby improving the working performance of the microwave RF circuit.

[0054] The above-mentioned filtering structure 120 includes at least one resonant ring filter. The capacitor C in the resonant ring filter and the corresponding second open ring L can form a ring resonant cavity to filter out interference signals in the corresponding frequency band. Since the ring resonant cavity has good frequency selectivity and a very high Q value, that is, the ring resonant cavity has low loss to non-resonant frequencies, the above-mentioned filtering structure 120 has little effect on the effective signal corresponding to the operating frequency f1 while filtering out the interference signal, and can reduce the loss caused to the effective signal.

[0055] A second aspect of the present application provides a communication device, wherein the communication device includes the microwave radio frequency circuit described in any one of the above embodiments.

[0056] The above-mentioned communication device is a radio frequency communication device, and may also include other related circuits and / or structures. The other related circuits and / or structures respectively assist each other with the microwave radio frequency circuit to realize the radio frequency communication function.

[0057] The above-mentioned communication device includes the microwave radio frequency circuit described in any of the above-mentioned embodiments, and has all the beneficial effects of the microwave radio frequency circuit described in any of the above-mentioned embodiments, which will not be repeated here.

[0058] Although the present application has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on reading and understanding this specification and the accompanying drawings. The present application includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the above-mentioned components, the terms used to describe such components are intended to correspond to any component (unless otherwise indicated) that performs the specified function of the component (e.g., it is functionally equivalent), even if it is not structurally equivalent to the disclosed structure that performs the function in the exemplary implementation of the present specification shown herein.

[0059] That is, the above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present application, such as the mutual combination of technical features between the embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

[0060] In addition, in the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, for structural elements with the same or similar characteristics, the present application may use the same or different reference numerals for identification. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0061] In this application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or more advantageous than other embodiments. In order to enable any technician in the field to implement and use the present application, the present application provides the above description. In the above description, various details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other embodiments, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

Claims

1. A microwave radio frequency circuit, characterized in that: The microwave radio frequency circuit includes a signal transmission structure and a filtering structure; The signal transmission structure comprises a first open ring, an input end for receiving a signal to be transmitted and an output end for outputting the signal to be transmitted, and a gap between the input end and the output end forms an opening of the first open ring; The filtering structure is coupled to at least one side of the signal transmission structure and is insulated from the signal transmission structure, and is used to filter out interference signals in at least one preset frequency band; the filtering structure includes at least one resonant ring filter, and the resonant ring filter includes a capacitor and a second open ring; the second open ring is consistent with the direction of the first open ring and is coupled to at least one side of the first open ring; the capacitor is arranged at the opening of the second open ring, respectively connected to the two ends of the second open ring, and forms a ring resonant cavity with the second open ring.

2. The microwave radio frequency circuit according to claim 1, characterized in that: The resonant ring filter is coupled to a first surface and / or a second surface of the signal transmission structure, and the first surface and the second surface are two opposite surfaces of the signal transmission structure.

3. The microwave radio frequency circuit according to claim 1, characterized in that: The second open ring provides an inductance with a parameter of L, and the capacitance with a parameter of C; The resonant frequency of the resonant ring filter is: 1 / a*L*C, where 1 / a is the resonance constant.

4. The microwave radio frequency circuit according to claim 1, characterized in that: The coupling length between the second open ring and the signal transmission structure is used to determine the suppression strength of the corresponding interference signal.

5. The microwave radio frequency circuit according to claim 1, characterized in that: The distance between the second open ring and the signal transmission structure is used to determine the suppression strength of the corresponding interference signal.

6. The microwave radio frequency circuit according to claim 1, characterized in that: The microwave radio frequency circuit also includes a dielectric layer; The dielectric layer is disposed between the second open ring and the signal transmission structure, and is used to maintain insulation between the second open ring and the signal transmission structure.

7. The microwave radio frequency circuit according to claim 2, characterized in that: The filtering structure includes a first resonant ring filter and a second resonant ring filter; The first resonant ring filter is coupled to the first surface of the signal transmission structure, and the resonant frequency is a first resonant frequency, and the first resonant frequency matches a first frequency band corresponding to the interference signal; The second resonant ring filter is coupled to the second surface of the signal transmission structure, and the resonant frequency is a second resonant frequency, and the second resonant frequency matches a second frequency band corresponding to the interference signal.

8. The microwave radio frequency circuit according to claim 1, characterized in that: The shape of the signal transmission structure includes any one of a rectangular shape, a circular shape, an elliptical shape and a racetrack shape.

9. A communication device, characterized in that: The communication device comprises the microwave radio frequency circuit according to any one of claims 1 to 8.

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