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Easy adjustable band-pass filter circuit

A filter circuit and band modulation technology, applied in electrical components, impedance networks, multi-terminal-pair networks, etc., can solve the problems of limited applicability, small bandwidth, and poor versatility, and achieve compact structure, high stability, and simple structure. Effect

Inactive Publication Date: 2015-10-21
王福建
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Problems solved by technology

However, its design structure can only be used in a specific frequency band, and the bandwidth is small, which makes the system larger and less versatile
At the same time, due to the problem of its circuit structure, the traditional band-pass filter circuit is extremely sensitive to temperature, and its applicability is greatly limited.

Method used

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Embodiment Construction

[0008] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0009] combine figure 1 , the present invention is a simple adjustable band-pass filter circuit, including input port 1, output port 2, coupling inductor L 2 , L 4 ; Two passive inductors L 1 , L 3 ; Three adjustable capacitors C 1 、C 2 and C 3 ; Input port 1 is connected to node 1; , Output port 2 is connected to node 2; where the coupled inductor L 2 One end of L is connected to node 1, and the other end is connected to ground; coupled inductance L 4 One end of L is connected to node 2, and the other end is connected to ground; inductance L 1 One end of L is connected to node 1, and the other end is connected to node 5; inductance L 3 One end of the capacitor is connected to node 2, and the other end is connected to node 6; the capacitor C 1 One end of the capacitor is connected to node 5, and the other end is connected to node 6; the capacitor C ...

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Abstract

The invention discloses an easy adjustable band-pass filter circuit. According to the structure, the circuit comprises an inductor and an adjustable capacitor. The easy adjustable band-pass filter circuit can be widely applied to wideband code division multiple access (WCDMA) mobile communication power amplifiers, radar antennas and so on having strict requirement on the signal performance. The easy adjustable band-pass filter circuit can suppress out-of-band noise, and improve stability of an electronic circuit. In addition, compared with band-pass filter circuits of other structures, the easy adjustable band-pass filter circuit is adjustable in band-pass filter, and the band-pass filter can be applied to different frequency bands of a communication system.

Description

technical field [0001] The invention relates to a band-pass filter circuit, in particular to an adjustable band-pass filter circuit, which belongs to the field of communication and electronic applications, and has important applications in filter and matching networks. Background technique [0002] In recent years, a series of researches on filter circuits have been carried out at home and abroad. A lot of research results have been obtained, especially in mobile communication technology, the filter circuit can effectively solve the problem of large noise outside the passband of the system when used in the front end of the power amplifier and the feeder part of the radar antenna. However, its design structure can only be used in a specific frequency band, and the bandwidth is small, which makes the system larger and less versatile. At the same time, due to the problem of its circuit structure, the traditional band-pass filter circuit is extremely sensitive to temperature, a...

Claims

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Application Information

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IPC IPC(8): H03H7/01
Inventor 王福建
Owner 王福建
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