CN219227568U - A pre-bandpass filter circuit - Google Patents

A pre-bandpass filter circuit Download PDF

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Publication number
CN219227568U
CN219227568U CN202320116484.0U CN202320116484U CN219227568U CN 219227568 U CN219227568 U CN 219227568U CN 202320116484 U CN202320116484 U CN 202320116484U CN 219227568 U CN219227568 U CN 219227568U
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China
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node
band
filter circuit
pass filter
capacitor
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Expired - Fee Related
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CN202320116484.0U
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Chinese (zh)
Inventor
王少夫
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Individual
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Individual
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Abstract

The utility model discloses a prepositive band-pass filter circuit, which is realized by a series resonance unit and a capacitor. The band-pass filter circuit can be widely used in places such as WCDMA mobile communication power amplifier, radar antenna and the like with strict requirements on signal performance. Out-of-band noise can be suppressed, and stability of the electronic circuit can be improved. Meanwhile, compared with band-pass filter circuits with other structures, the band-pass filter circuit can realize band-pass filtering and can be applied to a communication system.

Description

Front band-pass filter circuit
Technical Field
The utility model relates to a filter circuit, in particular to a band-pass filter circuit which has important application in a filter and matching network.
Background
In recent years, a series of researches on filter circuits have been carried out at home and abroad. Many research results are achieved, and particularly the filter circuit is applied to the mobile communication technology and used for the front end of a power amplifier and a radar antenna feed part, so that the problem of large noise outside a passband of a system can be effectively solved. However, the design structure can only be used in a specific frequency band, and the bandwidth is small, so that the system is large in size and low in universality. Meanwhile, the traditional band-pass filter circuit has extremely strong sensitivity to temperature due to the problem of the circuit structure, and the applicability is greatly limited. The utility model aims at the problems, can effectively solve the problems to meet the system requirements, and ensures that the system has high stability, small volume, simple processing and wide application range.
Disclosure of Invention
The utility model provides a band-pass filter circuit with simple structure, small volume and high stability.
The technical scheme for realizing the aim of the utility model is as follows: a front-end band-pass filter circuit is realized by series resonance units and capacitors. Wherein Port1 (Port 1) is connected with node 1; port2 (Port 2) is connected to node 5; one end of the series resonance unit L1C1 is connected with the node 1, and the other end is connected with the node 2; one end of the capacitor C3 is connected with the node 2, and the other end is connected with the node 3; one end of the capacitor C4 is connected with the node 3, and the other end is connected with the node 4; one end of the capacitor C5 is connected with the node 3, and the other end is connected with the ground; one end of the series resonance unit LC is connected with the node 2, and the other end is connected with the node 4; one end of the series resonance unit L2C2 is connected with the node 4, and the other end is connected with the node 5; both Port1 (Port 1) and Port2 (Port 2) inscribe 50 ohm resistors. The band-pass filter circuit can be widely used in places such as WCDMA mobile communication power amplifier, radar antenna and the like with strict requirements on signal performance. Out-of-band noise can be suppressed, and stability of the electronic circuit can be improved. Meanwhile, compared with band-pass filter circuits with other structures, the band-pass filter circuit can realize band-pass filtering and can be applied to a communication system.
Compared with the prior art, the utility model has the characteristics of bandpass, simple structure, small volume and high stability.
Drawings
Fig. 1 is a schematic diagram of a front-end bandpass filter circuit of the utility model.
Fig. 2 shows the amplitude-frequency response of the S parameter of a pre-band filter circuit according to the present utility model.
Fig. 3 is a phase-frequency response of the S-parameter of the pre-band-pass filter circuit of the present utility model.
Description of the embodiments
The utility model is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the present utility model is a front-end bandpass filter circuit, which is implemented by a series resonant unit and a capacitor. Wherein Port1 (Port 1) is connected with node 1; port2 (Port 2) is connected to node 5; one end of the series resonance unit L1C1 is connected with the node 1, and the other end is connected with the node 2; one end of the capacitor C3 is connected with the node 2, and the other end is connected with the node 3; one end of the capacitor C4 is connected with the node 3, and the other end is connected with the node 4; one end of the capacitor C5 is connected with the node 3, and the other end is connected with the ground; one end of the series resonance unit LC is connected with the node 2, and the other end is connected with the node 4; one end of the series resonance unit L2C2 is connected with the node 4, and the other end is connected with the node 5; both Port1 (Port 1) and Port2 (Port 2) inscribe 50 ohm resistors. As can be seen from the simulation results of fig. 2 and 3, the band-pass filter circuit can effectively realize a wider band-pass filter and exhibit linear phase characteristics. The designed band-pass filter can be used in a pulse multi-channel receiver, and output results are good after FSK modulation and demodulation. The use result shows that the device has a good suppression degree on the modulation pulse and noise level of the channel receiver, effectively solves the problems of excessively complex design steps and overlarge volume in the traditional design process, and can ensure that the device obtains the optimal channel signal transmission effect.

Claims (1)

1.一种前置带通滤波电路,其特征在于:该电路结构由串联谐振单元以及电容实现,其中,端口1(Port1)与结点1相连接;端口2(Port2)与结点5相连接;串联谐振单元L1C1的一端与结点1相连接,另一端与结点2相连接;电容C3的一端与结点2相连接,另一端与结点3相连接;电容C4的一端与结点3相连接,另一端与结点4相连接;电容C5的一端与结点3相连接,另一端与地相连接;串联谐振单元LC的一端与结点2相连接,另一端与结点4相连接;串联谐振单元L2C2的一端与结点4相连接,另一端与结点5相连接;端口1(Port1)与端口2(Port2)均内接50欧姆电阻。1. A front bandpass filter circuit is characterized in that: the circuit structure is realized by a series resonant unit and a capacitor, wherein, port 1 (Port1) is connected with node 1; port 2 (Port2) is connected with node 5 Connection; one end of the series resonant unit L1C1 is connected to node 1, and the other end is connected to node 2; one end of capacitor C3 is connected to node 2, and the other end is connected to node 3; one end of capacitor C4 is connected to node Point 3 is connected, and the other end is connected to node 4; one end of capacitor C5 is connected to node 3, and the other end is connected to ground; one end of the series resonance unit LC is connected to node 2, and the other end is connected to node 4-phase connection; one end of the series resonant unit L2C2 is connected to node 4, and the other end is connected to node 5; both port 1 (Port1) and port 2 (Port2) are internally connected with 50 ohm resistors.
CN202320116484.0U 2023-02-06 2023-02-06 A pre-bandpass filter circuit Expired - Fee Related CN219227568U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320116484.0U CN219227568U (en) 2023-02-06 2023-02-06 A pre-bandpass filter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320116484.0U CN219227568U (en) 2023-02-06 2023-02-06 A pre-bandpass filter circuit

Publications (1)

Publication Number Publication Date
CN219227568U true CN219227568U (en) 2023-06-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320116484.0U Expired - Fee Related CN219227568U (en) 2023-02-06 2023-02-06 A pre-bandpass filter circuit

Country Status (1)

Country Link
CN (1) CN219227568U (en)

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Granted publication date: 20230620