CN219227568U - Front band-pass filter circuit - Google Patents
Front band-pass filter circuit Download PDFInfo
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- 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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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
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. A front-end bandpass filter circuit, characterized by: the circuit structure is realized by a series resonance unit and a capacitor, wherein a Port1 (Port 1) is connected with a 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320116484.0U CN219227568U (en) | 2023-02-06 | 2023-02-06 | Front band-pass filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320116484.0U CN219227568U (en) | 2023-02-06 | 2023-02-06 | Front band-pass filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219227568U true CN219227568U (en) | 2023-06-20 |
Family
ID=86747079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320116484.0U Active CN219227568U (en) | 2023-02-06 | 2023-02-06 | Front band-pass filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219227568U (en) |
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2023
- 2023-02-06 CN CN202320116484.0U patent/CN219227568U/en active Active
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