CN116111972A - Filter circuit based on inductive element coupling and communication and sensing device thereof - Google Patents
Filter circuit based on inductive element coupling and communication and sensing device thereof Download PDFInfo
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- CN116111972A CN116111972A CN202211604207.0A CN202211604207A CN116111972A CN 116111972 A CN116111972 A CN 116111972A CN 202211604207 A CN202211604207 A CN 202211604207A CN 116111972 A CN116111972 A CN 116111972A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a filter circuit based on inductive element coupling and a communication and sensing device thereof, wherein a band-pass filter circuit with a compact structure is constructed based on the inductance of the filter circuit which is coupled in pairs, so that the filter based on the filter circuit has a compact structure, the coupling is fully utilized, the elements of the circuit are reduced, and the size of a device is reduced; in addition, the filter circuit based on inductive element coupling provided by the invention has four transmission poles and one transmission zero, so that the filter circuit has the characteristics of wide passband, high selectivity and wide stopband.
Description
Technical Field
The invention belongs to the field of circuits, and particularly relates to a filter circuit based on inductive element coupling and a communication and sensing device thereof.
Background
With the rapid development of microwave technology, the demand of microwave passive devices in the fields of microwave communication, satellite communication, military electronic countermeasure and the like is continuously increasing. The function of the filter in the microwave passive device is to select the desired signal in the frequency spectrum and suppress the undesired signal. As radio communication users increase, frequency resources are increasingly strained, frequency intervals allocated to various types of communication systems are increasingly more closely spaced, and the number of required filters is also multiplied. However, the area of the whole wireless communication system is constant, so it is important to design a filter with a compact structure, but the compact structure inevitably generates coupling, thereby generating interference to a circuit.
Disclosure of Invention
The invention aims to solve the technical problems that as the number of users for radio communication is increased, the frequency resources are increasingly tensioned, the frequency intervals distributed to various communication systems are increasingly dense, the number of required filters is increased exponentially, but the area of the whole wireless communication system is fixed, so that the filters with compact structures are required to be designed, but the filters with compact structures are easy to generate coupling, and thus the circuit is interfered.
In order to solve the technical problems, the invention adopts the following technical scheme:
a filter circuit based on inductive element coupling comprises an input end Port1, an output end Port2 and a capacitorC 1 CapacitanceC 2 CapacitanceC 3 CapacitanceC’ 2 CapacitanceC’ 3 InductanceL 1 InductanceL’ 1 InductanceL 2 InductanceL’ 2 The method comprises the steps of carrying out a first treatment on the surface of the Input Port1 and capacitorC 3 One end of (2) an inductorL 1 One end of the first connecting rod is connected with the other end of the second connecting rod; capacitance deviceC 3 Is connected with the inductor at the other endL’ 1 And is connected to ground; inductanceL 1 Is connected with the other end of the capacitorC 2 One end of (2) an inductorL 2 One end of (2) a capacitorC 1 One end of the first connecting piece is connected with the other end of the second connecting piece; capacitance deviceC 2 The other end of the first electrode is grounded; inductanceL 2 The other end of (a) is connected with a capacitorC’ 3 And is connected to ground; capacitance deviceC 1 Is connected with the other end of the capacitorC’ 2 One end of (2) an inductorL’ 1 Is the other end of (2) and inductanceL’ 2 One end of the first connecting piece is connected with the other end of the second connecting piece; capacitance deviceC’ 2 The other end of the first electrode is grounded; inductanceL’ 2 The other end of (a) is connected with a capacitorC’ 3 And is connected with the other end of the output Port 2; the inductorL 1 InductanceL’ 1 Is configured to be present inAre coupled with each other; the inductorL 2 InductanceL’ 2 Is configured such that there is mutual coupling.
Preferably, the capacitorC 2 CapacitanceC’ 2 The capacitance values of (2) are the same.
Preferably, the capacitorC 3 CapacitanceC’ 3 The capacitance values of (2) are the same.
Preferably, the inductorL 1 InductanceL’ 1 InductanceL 2 InductanceL’ 2 The inductance value of (2) is the same.
Preferably, the inductorL 1 InductanceL’ 1 Coupling coefficient and inductance betweenL 2 InductanceL’ 2 The coupling coefficients are the same.
A communication device comprises the filtering circuit based on inductive element coupling.
A sensing device comprises the filtering circuit based on inductive element coupling.
The beneficial effects of the invention are as follows: the invention provides a filter circuit based on inductive element coupling and a communication and sensing device thereof, wherein a band-pass filter circuit with a compact structure is constructed based on the inductance of the filter circuit which is coupled in pairs, so that the filter based on the filter circuit has a compact structure, the coupling is fully utilized, the elements of the circuit are reduced, and the size of a device is reduced; in addition, the filter circuit based on inductive element coupling provided by the invention has four transmission poles and one transmission zero, so that the filter circuit has the characteristics of wide passband, high selectivity and wide stopband.
Drawings
FIG. 1 is a circuit diagram of a filter circuit based on inductive element coupling in an embodiment of the invention;
FIG. 2 shows different coupling coefficients in an embodiment of the inventionMAn insertion loss performance diagram of the lower filter circuit;
fig. 3 is a graph of return loss and insertion loss performance of a filter circuit based on inductive element coupling in an embodiment of the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples will provide those skilled in the art with a more complete understanding of the invention, but are not intended to limit the invention in any way.
In one embodiment, as shown in FIG. 1, a filter circuit based on inductive element coupling is constructed, comprising an input Port1, an output Port2, and a capacitorC 1 CapacitanceC 2 CapacitanceC 3 CapacitanceC’ 2 CapacitanceC’ 3 InductanceL 1 InductanceL’ 1 InductanceL 2 InductanceL’ 2 The method comprises the steps of carrying out a first treatment on the surface of the Input Port1 and capacitorC 3 One end of (2) an inductorL 1 One end of the first connecting rod is connected with the other end of the second connecting rod; capacitance deviceC 3 Is connected with the inductor at the other endL’ 1 And is connected to ground; inductanceL 1 Is connected with the other end of the capacitorC 2 One end of (2) an inductorL 2 One end of (2) a capacitorC 1 One end of the first connecting piece is connected with the other end of the second connecting piece; capacitance deviceC 2 The other end of the first electrode is grounded; inductanceL 2 The other end of (a) is connected with a capacitorC’ 3 And is connected to ground; capacitance deviceC 1 Is connected with the other end of the capacitorC’ 2 One end of (2) an inductorL’ 1 Is the other end of (2) and inductanceL’ 2 One end of the first connecting piece is connected with the other end of the second connecting piece; capacitance deviceC’ 2 The other end of the first electrode is grounded; inductanceL’ 2 The other end of (a) is connected with a capacitorC’ 3 And is connected with the other end of the output Port 2; the inductorL 1 InductanceL’ 1 Configured to have a mutual coupling; the inductorL 2 InductanceL’ 2 Is configured such that there is mutual coupling.
In this embodiment, the capacitorC 2 CapacitanceC’ 2 The capacitance values of (2) are the same. The capacitorC 3 CapacitanceC’ 3 The capacitance values of (2) are the same. The inductorL 1 InductanceL’ 1 InductanceL 2 InductanceL’ 2 The inductance value of (2) is the same. The inductorL 1 InductanceL’ 1 Coupling coefficient and inductance betweenL 2 InductanceL’ 2 The coupling coefficient M between them is the same.
Furthermore, the filter circuit structure based on inductive element coupling in the scheme has 5 element variables, namely four identical inductancesL 1 、L’ 1 、L 2 、L’ 2 Two identical capacitorsC 2 、C’ 2 Two identical capacitorsC 3 、C’ 3 And a coupling coefficientM. The circuit structure realizes a fourth-order broadband filter circuit with high selectivity and wide stop band by changing mutual coupling between inductorsMDifferent bandwidths may be implemented. As shown in fig. 2, fig. 2 shows the insertion loss performance of the filter circuit under different coupling coefficients in the circuit structure in this scheme, and it can be seen from the figure that the larger the coupling coefficient is, the larger the bandwidth is, but as the bandwidth increases, the rejection capability of the stop band also decreases. During actual use, the design can be made by selecting proper bandwidth and suppression capability.
Specifically, in this embodiment, the corresponding element values in the filter circuit structure based on inductive element coupling in this embodiment are respectively coupling coefficientsM=0.75, inductanceL 1 =L’ 1 =L 2 =L’ 2 =5.4 nH, capacitanceC 1 =1.74 pF, capacitanceC 2 =C’ 2 =1.74 pF, capacitanceC 3 =C’ 3 =1.74 pF. Further, as shown in fig. 3, the pass band range of 1-dB is 0.65 GHz to 4.6 GHz, the relative bandwidth is 150%, and the return loss is 20 dB, for the return loss and insertion loss performance of the filter circuit by inductive element coupling. In the figureS 11 In the form of a return loss curve,S 21 for the insertion loss characteristic, it can be seen from the figure that the structure has a high selectivity at the upper stop band.
Based on the above-mentioned filtering circuit based on inductive element coupling, in one embodiment, a communication device includes the filtering circuit based on inductive element coupling.
In another embodiment, a sensing device comprises the inductive element coupling based filter circuit.
The invention designs a filter circuit based on inductive element coupling and a communication and sensing device thereof, and constructs a band-pass filter circuit with a compact structure based on the pair-by-pair coupling inductors; in addition, the filter circuit based on inductive element coupling provided by the invention has four transmission poles and one transmission zero, so that the filter circuit has the characteristics of wide passband, high selectivity and wide stopband.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the foregoing embodiments may be modified or equivalents substituted for some of the features thereof. All equivalent structures made by the content of the specification and the drawings of the invention are directly or indirectly applied to other related technical fields, and are also within the scope of the invention.
Claims (7)
1. A filter circuit based on inductive element coupling is characterized by comprising an input end Port1, an output end Port2 and a capacitorC 1 CapacitanceC 2 CapacitanceC 3 CapacitanceC’ 2 CapacitanceC’ 3 InductanceL 1 InductanceL’ 1 InductanceL 2 InductanceL’ 2 The method comprises the steps of carrying out a first treatment on the surface of the Input Port1 and capacitorC 3 One end of (2) an inductorL 1 One end of the first connecting rod is connected with the other end of the second connecting rod; capacitance deviceC 3 Is connected with the inductor at the other endL’ 1 And is connected to ground; inductanceL 1 Is connected with the other end of the capacitorC 2 One end of (2) an inductorL 2 One end of (2) a capacitorC 1 One end of the first connecting piece is connected with the other end of the second connecting piece; capacitance deviceC 2 The other end of the first electrode is grounded; inductanceL 2 The other end of (a) is connected with a capacitorC’ 3 And is connected to ground; capacitance deviceC 1 Is connected with the other end of the capacitorC’ 2 One end of (2) an inductorL’ 1 Is the other end of (2) and inductanceL’ 2 One end of the first connecting piece is connected with the other end of the second connecting piece; capacitance deviceC’ 2 The other end of the first electrode is grounded; inductanceL’ 2 The other end of (a) is connected with a capacitorC’ 3 And is connected with the other end of the output Port 2; the inductorL 1 InductanceL’ 1 Configured to have a mutual coupling; the inductorL 2 InductanceL’ 2 Is configured such that there is mutual coupling.
2. The inductive element coupling based filter circuit of claim 1, wherein said capacitorC 2 CapacitanceC’ 2 The capacitance values of (2) are the same.
3. The inductive element coupling based filter circuit of claim 1, wherein said capacitorC 3 CapacitanceC’ 3 The capacitance values of (2) are the same.
4. The inductive element coupling based filter circuit of claim 1, wherein said inductorL 1 InductanceL’ 1 InductanceL 2 InductanceL’ 2 The inductance value of (2) is the same.
5. The inductive element coupling based filter circuit of claim 1, wherein said inductorL 1 InductanceL’ 1 Coupling coefficient and inductance betweenL 2 InductanceL’ 2 The coupling coefficients are the same.
6. A communication device comprising the inductive element coupling based filter circuit of any one of claims 1-5.
7. A sensing device comprising the inductive element coupling based filter circuit of any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211604207.0A CN116111972A (en) | 2022-12-13 | 2022-12-13 | Filter circuit based on inductive element coupling and communication and sensing device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211604207.0A CN116111972A (en) | 2022-12-13 | 2022-12-13 | Filter circuit based on inductive element coupling and communication and sensing device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116111972A true CN116111972A (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211604207.0A Pending CN116111972A (en) | 2022-12-13 | 2022-12-13 | Filter circuit based on inductive element coupling and communication and sensing device thereof |
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| Country | Link |
|---|---|
| CN (1) | CN116111972A (en) |
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2022
- 2022-12-13 CN CN202211604207.0A patent/CN116111972A/en active Pending
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