阅读说明：本技术 谐振电路和滤波器件 (Resonant circuit and filter device ) 是由 程伟 戴立杰 左成杰 何军 于 2020-04-21 设计创作，主要内容包括：本申请提供的谐振电路和滤波器件,涉及电子器件技术领域。其中,谐振电路包括：连接端口,该连接端口包括第一端口和第二端口；谐振单元,该谐振单元包括至少一个电感元件和至少一个电容元件,且该至少一个电感元件与该至少一个电容元件连接。其中,第一端口和第二端口与谐振单元分别连接,以形成并联连接的至少两条支路,且该第一端口和该第二端口中,至少存在一个与每一个电容元件都不连接的端口。通过上述设置,可以改善现有的谐振电路因受限于电容难以做得较大而使得在传输零点附近的频率位置难以获得较高的抑制度的问题。(The application provides a resonant circuit and filter relates to electron device technical field. Wherein, resonant circuit includes: a connection port including a first port and a second port; a resonance unit including at least one inductive element and at least one capacitive element, and the at least one inductive element is connected with the at least one capacitive element. The first port and the second port are respectively connected with the resonance unit to form at least two branches connected in parallel, and at least one port which is not connected with each capacitance element exists in the first port and the second port. With the arrangement, the problem that a conventional resonant circuit is limited in that the capacitance is difficult to be made large, so that a high suppression degree is difficult to be obtained at a frequency position near the transmission zero point can be solved.)

1. A resonant circuit, comprising:

a connection port including a first port and a second port;

a resonance unit including at least one inductance element and at least one capacitance element, and the at least one inductance element being connected with the at least one capacitance element;

wherein the first port and the second port are respectively connected with the resonance unit to form at least two branches connected in parallel, and at least one port not connected with each of the capacitance elements exists in the first port and the second port.

2. The resonant circuit of claim 1, wherein the first port is connected between an inductive element and a capacitive element, and the second port is connected to at least one inductive element and not to each of the capacitive elements.

3. The resonant circuit of claim 1, wherein the first port is connected to at least one inductive element and not to each of the capacitive elements, and the second port is connected to at least one inductive element and not to each of the capacitive elements.

4. A resonant circuit according to any one of claims 1 to 3, wherein the port to which each of the capacitive elements is not connected is connected between two inductive elements.

5. A resonant circuit according to any one of claims 1 to 3, wherein the port to which each of the capacitive elements is not connected is connected between two adjacent different parts of an inductive element, such that the two adjacent different parts belong to two branches connected in parallel, respectively.

6. The resonant circuit according to any of claims 1-3, wherein the at least one inductive element and the at least one capacitive element are connected end to end in sequence to form a closed loop circuit;

wherein the first port and the second port are connected with different positions of the ring circuit to form two branches connected in parallel.

7. The resonant circuit of claim 6, wherein the resonant unit comprises an inductive element and a capacitive element, and wherein the inductive element and the capacitive element are connected end to form a closed loop circuit.

8. The resonant circuit of claim 7, wherein the inductive element comprises adjacent first and second portions;

the first port is connected between the inductance element and the capacitance element, and the second port is connected between the first part and the second part, so that the first part and the second part respectively belong to two branches connected in parallel.

9. The resonant circuit of claim 7, wherein the inductive element comprises a first portion, a second portion, and a third portion that are adjacent in sequence;

wherein the first port is connected between the first portion and the second portion, and the second port is connected between the second portion and the third portion, such that the first portion, the capacitive element and the third portion are connected in series and form a parallel connection with the second portion.

10. A filter device comprising a plurality of the resonance circuits according to any one of claims 1 to 9, and the plurality of resonance circuits are connected through connection ports, respectively.

Technical Field

The application relates to the technical field of electronic devices, in particular to a resonant circuit and a filter device.

Background

In the design of a filter device, transmission zeros are typically generated by a resonant circuit in order to achieve a certain degree of suppression. The parallel resonant circuit composed of the capacitor and the inductor is widely applied to filter devices.

However, the inventors have found that, in a conventional capacitor/inductor parallel resonant circuit, it is difficult to increase the capacitance in some applications, and thus, there is a problem that it is difficult to obtain a high suppression degree at a frequency position near the transmission zero point.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a resonant circuit and a filter device, so as to solve the problem that it is difficult to obtain a high suppression degree at a frequency position near a transmission zero point due to the limitation that a capacitance is difficult to be made large in the conventional resonant circuit.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

a resonant circuit, comprising:

a connection port including a first port and a second port;

a resonance unit including at least one inductance element and at least one capacitance element, and the at least one inductance element being connected with the at least one capacitance element;

wherein the first port and the second port are respectively connected with the resonance unit to form at least two branches connected in parallel, and at least one port not connected with each of the capacitance elements exists in the first port and the second port.

In a preferred option of the embodiment of the present application, in the resonant circuit, the first port is connected between an inductive element and a capacitive element, and the second port is connected to at least one inductive element and is not connected to each of the capacitive elements.

In a preferred option of the embodiment of the present application, in the resonant circuit, the first port is connected to at least one inductive element and is not connected to each of the capacitive elements, and the second port is connected to at least one inductive element and is not connected to each of the capacitive elements.

In a preferred option of the embodiment of the present application, in the resonant circuit, a port not connected to each of the capacitive elements is connected between the two inductive elements.

In a preferred option of the embodiment of the present application, in the resonant circuit, the port not connected to each of the capacitance elements is connected between two adjacent different portions of one inductance element, so that the two adjacent different portions belong to two branches connected in parallel respectively.

In a preferred option of the embodiment of the present application, in the resonant circuit, the at least one inductance element and the at least one capacitance element are sequentially connected end to form a closed loop circuit;

wherein the first port and the second port are connected with different positions of the ring circuit to form two branches connected in parallel.

In a preferred option of the embodiment of the present application, in the resonant circuit, the resonant unit includes an inductive element and a capacitive element, and the inductive element and the capacitive element are connected end to form a closed loop circuit.

In a preferred option of the embodiment of the present application, in the resonant circuit, the inductive element includes a first portion and a second portion that are adjacent to each other;

the first port is connected between the inductance element and the capacitance element, and the second port is connected between the first part and the second part, so that the first part and the second part respectively belong to two branches connected in parallel.

In a preferred option of the embodiment of the present application, in the resonant circuit, the inductance element includes a first portion, a second portion, and a third portion that are adjacent in sequence;

wherein the first port is connected between the first portion and the second portion, and the second port is connected between the second portion and the third portion, such that the first portion, the capacitive element and the third portion are connected in series and form a parallel connection with the second portion.

On the basis, the embodiment of the application also provides a filter device, which comprises a plurality of the resonant circuits, wherein the resonant circuits are connected through the connecting ports respectively.

The application provides a resonant circuit and filter, through setting up at least one with the port that capacitive element does not connect for resonant circuit's resonance performance can obtain the adjustment. In this way, compared with the prior art, each port is connected with the capacitor element, so that the same degree of suppression can be obtained at the frequency position near the transmission zero point under the condition that the same capacitance value is used to generate the same resonance frequency, or the same degree of suppression can be obtained at the frequency position near the transmission zero point under the condition that the same resonance frequency is generated by using the capacitance with a smaller capacitance value, thereby solving the problem that the high degree of suppression is difficult to obtain at the frequency position near the transmission zero point because the capacitance is difficult to be made larger in the existing resonance circuit, having higher practical value, and particularly obtaining better application effect in some miniaturized precision instruments.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 shows a parallel resonant circuit in the prior art.

Fig. 2 shows another parallel resonant circuit of the prior art.

Fig. 3 is a graph showing resonance performance curves of two parallel resonant circuits shown in fig. 1 and 2.

Fig. 4 is a schematic port connection diagram of a resonant circuit according to an embodiment of the present disclosure.

Fig. 5 is a schematic diagram of another port connection of the resonant circuit according to the embodiment of the present application.

Fig. 6 is a schematic circuit diagram of a resonant unit according to an embodiment of the present application.

Fig. 7 is another schematic circuit diagram of a resonant unit according to an embodiment of the present disclosure.

Fig. 8 is a schematic diagram of a port connection circuit of a resonant circuit according to an embodiment of the present disclosure.

Fig. 9 is a graph showing resonance performance curves of two parallel resonant circuits shown in fig. 1 and 8.

Fig. 10 is a schematic diagram of another port connection circuit of the resonant circuit according to the embodiment of the present application.

Fig. 11 is a graph showing resonance performance curves of two parallel resonant circuits shown in fig. 1 and 10.

Fig. 12 is a block diagram of a filter device according to an embodiment of the present application.

The figure shows 10-filter, 100-resonant circuit, 110-connection port, 111-first port, 113-second port, 130-resonant cell, 131-inductive element, 131 a-first part, 131 b-second part, 131C-third part, 133-capacitive element, L1-first inductor, L2-second inductor, C1-first capacitor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1, it is a parallel resonant circuit in the prior art. The parallel resonant circuit includes a capacitor (capacitance may be 2pF) and an inductor (inductance may be 1.5nH), and the capacitor and the inductor are connected in parallel, so that a resonant frequency of about 2.9GHz can be generated.

As shown in fig. 2, is another parallel resonant circuit in the prior art. The parallel resonant circuit includes a capacitor (capacitance may be 1pF) and an inductor (inductance may be 3nH), and the capacitor and the inductor are connected in parallel, and the resonant frequency is about 2.9 GHz.

Fig. 3 is a schematic diagram showing a simulation of resonance performance of two parallel resonant circuits shown in fig. 1 and 2. It can be known that the resonant frequencies of the two parallel resonant circuits are the same, but with the parallel resonant circuit shown in fig. 1, a higher degree of suppression (steeper side band) can be generated at a frequency position near the transmission zero point, but a larger capacitance is required, so that the application environment is limited; with the parallel resonant circuit shown in fig. 2, a capacitor having a smaller capacitance value can be used, so that the degree of limitation of the application environment is lower, but the suppression degree generated at the frequency position near the transmission zero point is lower.

Based on the existence of the above technical problems, the inventor of the present application has proposed a technical solution completely different from changing the inductance value and the capacitance value based on long-term research findings, so as to solve the above technical problems. In this technical solution, the position of the port is creatively adjusted so that a higher suppression degree can be obtained at a frequency position near the transmission zero point in the case where the same resonance frequency is generated using the capacitance having the same capacitance value, or the same suppression degree can be obtained at a frequency position near the transmission zero point in the case where the same resonance frequency is generated using the capacitance having a smaller capacitance value.

Based on this, in conjunction with fig. 4, the present application provides a resonant circuit 100. The resonant circuit 100 may include a connection port 110 and a resonant unit 130.

In detail, the connection port 110 may include a first port 111 and a second port 113. The resonance unit 130 may include at least one inductive element 131 and at least one capacitive element 133, and the at least one inductive element 131 may be connected with the at least one capacitive element 133.

The first port 111 and the second port 113 are respectively connected to the resonance unit 130 to form at least two branches connected in parallel, and at least one port not connected to each of the capacitance elements 133 exists in the first port 111 and the second port 113.

Based on the above-mentioned arrangement in which at least one port is not connected to the capacitor element 133, compared to the prior art in which each port is connected to the capacitor element 133, it is possible to obtain a higher suppression degree at a frequency position near the transmission zero point when a capacitor having the same capacitance value is used and the same resonance frequency is generated, or it is possible to obtain the same suppression degree at a frequency position near the transmission zero point when a capacitor having a smaller capacitance value is used and the same resonance frequency is generated, thereby improving a problem that it is difficult to obtain a higher suppression degree at a frequency position near the transmission zero point due to the fact that the capacitance is limited to be difficult to be made larger in the conventional resonance circuit.

In the first aspect, it should be noted that, for the connection port 110, specific functions of the first port 111 and the second port 113 included in the connection port 110 are not limited, and may be selected according to actual application requirements.

For example, in an alternative example, the first port 111 may serve as an input port of the resonant circuit 100 and the second port 113 may serve as an output port of the resonant circuit 100. In this way, the signal to be processed can be input through the first port 111, and after being processed by the resonance unit 130, the signal can be output through the second port 113.

For another example, in another alternative example, the first port 111 may serve as an output port of the resonant circuit 100, and the second port 113 may serve as an input port of the resonant circuit 100. In this way, the signal to be processed can be input through the second port 113, and after being processed by the resonance unit 130, the signal can be output through the first port 111.

It should be noted that, for the connection port 110, a specific connection relationship between the first port 111 and the second port 113 included in the connection port 110 and the resonance unit 130 is also not limited, and may be selected according to a practical application requirement.

For example, in an alternative example, one of the first port 111 and the second port 113 may be connected to at least one of the inductive elements 131, and the port may not be connected to each of the capacitive elements 133, and the other port may be connected between one of the inductive elements 131 and one of the capacitive elements 133.

In detail, in a specific application example, the first port 111 may be connected between one of the inductive elements 131 and one of the capacitive elements 133. The second port 113 may be connected to at least one of the inductive elements 131 and not to each of the capacitive elements 133 (as shown in fig. 4).

For another example, in another alternative example, in the first port 111 and the second port 113, both ports are connected to at least one of the inductive elements 131, and the port is not connected to each of the capacitive elements 133.

In detail, in a specific application example, the first port 111 may be connected to at least one inductive element 131, and not connected to each of the capacitive elements 133. The second port 113 may be connected to at least one inductive element 131 and not to each of the capacitive elements 133 (as shown in fig. 5).

It will be appreciated that, for the ports (such as the first port 111 and the second port 113 described above) not connected to each of the capacitive elements 133, the ports need to be connected to at least one inductive element 131, and likewise, the specific connection relationship between the ports and the at least one inductive element 131 is not limited, and can be selected according to the practical application requirements.

For example, in an alternative example, a port not connected to each of the capacitive elements 133 may be connected between two inductive elements 131.

That is, in the above example, the resonance unit 130 may include at least two inductance elements 131, and of the at least two inductance elements 131, two inductance elements 131 adjacently disposed are included.

For another example, in another alternative example, a port not connected to each of the capacitance elements 133 may be connected between two adjacent different portions of one inductance element 131, so that the two adjacent different portions belong to two branches connected in parallel respectively.

That is, in the above example, the resonance unit 130 may include at least one inductance element 131, and of the at least one inductance element 131, one inductance element 131 may include two adjacent different portions.

In the second aspect, it should be noted that, for the resonant unit 130, the specific number of the inductive elements 131 and the capacitive elements 133 included in the resonant unit 130 is not limited, and may be selected according to the actual application requirement.

For example, in an alternative example, the resonance unit 130 may include an inductive element 131 and a capacitive element 133. Thus, the inductive element 131 and the capacitive element 133 may be connected end to form a closed loop circuit.

For another example, in another alternative example, the resonance unit 130 may include a plurality of inductive elements 131 and one capacitive element 133, may also include one inductive element 131 and a plurality of capacitive elements 133, and may also include a plurality of inductive elements 131 and a plurality of capacitive elements 133.

That is, the sum of the numbers of the inductance element 131 and the capacitance element 133 may be greater than or equal to three. In this way, three or more inductive elements 131 and three or more capacitive elements 133 may be connected end to form at least one closed loop circuit.

Based on this, it can be known that when the resonance unit 130 includes at least one inductive element 131 and at least one capacitive element 133, the at least one inductive element 131 and the at least one capacitive element 133 may form at least one closed loop circuit by end-to-end connection.

That is, the number of loop circuits formed differs depending on the number of inductance elements 131 and capacitance elements 133 and the specific manner of end-to-end connection.

For example, in an alternative example, in conjunction with fig. 6, the resonant unit 130 may include a first inductor L1, a second inductor L2, and a first capacitor C1, wherein the first inductor L1, the second inductor L2, and the first capacitor C1 may be connected end to end in sequence to form a closed loop circuit.

For another example, in another alternative example, referring to fig. 7, the resonant unit 130 may include a first inductor L1, a second inductor L2, and a first capacitor C1, where the first inductor L1, the second inductor L2, and the first capacitor C1 may be connected end to end, but not sequentially, to form 3 loop circuits, for example, the first inductor L1 and the second inductor L2 form a closed loop circuit, the first inductor L1 and the first capacitor C1 also form a closed loop circuit, and the second inductor L2 and the first capacitor C1 form a closed loop circuit.

Based on the difference in the number of the loop circuits formed by the at least one inductance element 131 and the at least one capacitance element 133, the first port 111 and the second port 113 may be connected differently to form a different number of branches connected in parallel.

For example, in an alternative example, the at least one inductive element 131 and the at least one capacitive element 133 are connected end to end in sequence to form a closed loop circuit. In this way, the first port 111 and the second port 113 are connected to different positions of the loop circuit to form two branches connected in parallel.

In combination with the foregoing examples, the connection positions of the first port 111 and the second port 113 to the loop circuit may be selected differently. Based on this, in the present embodiment, when the resonant unit 130 includes an inductive element 131 and a capacitive element 133, and the inductive element 131 and the capacitive element 133 are connected end to form a closed loop circuit, the following two examples are provided respectively.

First, referring to fig. 8, in the first example, only one of the first port 111 and the second port 113 is not connected to the capacitive element 133. In detail, the inductance element 131 may include a first portion 131a and a second portion 131b adjacent to each other.

In this way, the first port 111 may be connected between the inductive element 131 and the capacitive element 133, and the second port 113 may be connected between the first portion 131a and the second portion 131b, so that the first portion 131a and the second portion 131b belong to two branches connected in parallel, respectively.

That is, one of the first portion 131a and the second portion 131b is connected in series with the capacitive element 133 to form one branch, and the other portion may form the other branch.

In a specific application example, the first port 111 may be connected between the first portion 131a and the capacitive element 133, and the second port 113 may be connected between the first portion 131a and the second portion 131 b.

In order to obtain the same resonant frequency as the circuit shown in fig. 1, the capacitance value of the capacitor 133 may be 1pF (smaller than 2pF shown in fig. 1), the inductance value of the first portion 131a may be 2nH, and the inductance value of the second portion 131b may be 1 nH. Thus, by comparing the simulation with the circuit shown in fig. 1, a graph of the resonance performance as shown in fig. 9 can be obtained.

Based on this, it is understood that the circuit shown in fig. 8 can obtain substantially the same resonance performance as the circuit shown in fig. 1 while reducing the capacitance value of the capacitor, and has a high suppression degree at the frequency position near the transmission zero point.

Next, referring to fig. 10, in the second example, neither of the first port 111 and the second port 113 is connected to the capacitive element 133. In detail, the inductance element 131 may include a first portion 131a, a second portion 131b, and a third portion 131c, which are adjacent in sequence.

As such, the first port 111 may be connected between the first portion 131a and the second portion 131b, and the second port 113 may be connected between the second portion 131b and the third portion 131c, such that the first portion 131a, the capacitive element 133, and the third portion 131c are connected in series and form a parallel connection with the second portion 131 b.

That is, the first portion 131a, the capacitive element 133 and the third portion 131c are connected in series to form one branch. The second portion 131b may form another branch.

In this way, in order to obtain the same resonant frequency of the circuit shown in fig. 1, the capacitance value of the capacitive element 133 may be 1pF (smaller than 2pF shown in fig. 1), the inductance value of the first portion 131a may be 0.5nH, the inductance value of the second portion 131b may be 2nH, and the inductance value of the third portion 131c may be 0.5 nH. Thus, by comparing the simulation with the circuit shown in fig. 1, the resonance performance graph shown in fig. 11 can be obtained.

Based on this, it is understood that the circuit shown in fig. 10 can obtain substantially the same resonance performance as the circuit shown in fig. 1 while reducing the capacitance value of the capacitor, and has a high suppression degree at a frequency position near the transmission zero point.

It is understood that, in the above example, the inductance element 131 and the capacitance element 133 are connected end to form a closed loop circuit, which may mean that the inductance element 131 and the capacitance element 133 are directly connected, or that the inductance element 131 and the capacitance element 133 are respectively connected to a port (such as the first port 111 or the second port 113) so as to be indirectly connected based on the port.

With reference to fig. 12, the present embodiment also provides a filter device 10. Wherein the filter device 10 may comprise a plurality of resonant circuits 100 as described above.

In detail, a plurality of the resonant circuits 100 may be connected through respective connection ports 110 (such as the first port 111 and the second port 113 described above) to form the filter device 10.

The specific configurations of the resonant units 130 included in the plurality of resonant circuits 100 may be different to generate different resonant frequencies, respectively, so as to form bandpass filtering.

It is to be understood that in the example shown in fig. 12, a plurality of the resonance circuits 100 may be connected in series. In other examples, a plurality of the resonant circuits 100 may be connected in parallel, or a mixture thereof (including series and parallel connections), based on other requirements.

Also, in the above examples, a plurality may mean two or more.

In summary, the resonant circuit 100 and the filter device 10 provided in the present application have at least one port that is not connected to the capacitor 133, so that the resonant performance of the resonant circuit 100 can be adjusted. In this way, compared with the prior art, by connecting each port to the capacitor element 133, it is possible to obtain a higher suppression degree at a frequency position near the transmission zero point when the same capacitance value is used and the same resonance frequency is generated, or to obtain the same suppression degree at a frequency position near the transmission zero point when a capacitance with a smaller capacitance value is used and the same resonance frequency is generated, thereby improving the problem that it is difficult to obtain a higher suppression degree at a frequency position near the transmission zero point because the capacitance is limited to be difficult to be made larger in the conventional resonance circuit, and having a higher practical value, and particularly, obtaining a better application effect in some miniaturized precision instruments.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.