Notch filter and multi-frequency notch filter
A notch filter and notch filter technology, applied in the field of communication, can solve the problems of low quality factor, large circuit design size cannot meet the application requirements of small portable equipment, and high notch loss, so as to improve the suppression characteristics and reduce the loss. , the effect of increasing the notch bandwidth
Pending Publication Date: 2021-06-01
ANHUI ANUKI TECH CO LTD
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Problems solved by technology
[0003] At present, designers usually use lumped components such as capacitors and inductors to form notch filters or use microstrip line circuits to form notch filters, but the circuit design size of these two filters is too large to meet the application requirements of small portable devices
In addition, the quality factor of the notch filter formed by lumped components such as capacitors and inductors or the notch filter formed by microstrip line circuits is low, and the loss caused by the notch will be higher
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0032] An embodiment of the present invention provides a schematic structural diagram of a notch filter, figure 1 A schematic structural diagram of a notch filter provided by an embodiment of the present invention. Such as figure 1 As shown, the notch filter includes at least one notch filter unit; the notch filter unit includes an input port A,...
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The invention discloses a notch filter and a multi-frequency notch filter. The notch filter comprises at least one notch filter unit; the notch filtering unit comprises an input port, an output port, at least three resonators and at least one inductive element, wherein the resonators comprise at least two first resonators and at least one second resonator; the first resonators are connected in series between the input port and the output port, the first ends of the second resonators are connected with the connection points between the adjacent first resonators, the second ends of the second resonators are connected with the fixed potential end, and the at least one inductive element is connected in parallel with the second resonators. According to the trapped wave characteristics of the resonators, the trapped wave filtering unit formed based on the resonators is designed, the good trapped wave characteristics are achieved, the circuit size of the trapped wave filter can be reduced, the signal suppression effect is improved, and the trapped wave loss is reduced.
Description
technical field [0001] The embodiments of the present invention relate to the field of communication technologies, and in particular to a notch filter and a multi-frequency notch filter. Background technique [0002] With the development of communication technology, the requirements for spectrum utilization are getting higher and higher, and the transmission frequency band spacing between different information in the process of information transmission is getting smaller and smaller. Therefore, the notch filter is required to have better notch characteristics to meet the requirements of information transmission. [0003] At present, designers usually use lumped components such as capacitors and inductors to form notch filters or microstrip circuits to form notch filters, but the circuit design size of these two filters is too large to meet the application requirements of small portable devices. In addition, the notch filter formed by lumped components such as capacitors and...
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IPC IPC(8): H03H17/02
CPCH03H17/02
Inventor 左成杰何军其他发明人请求不公开姓名
Owner ANHUI ANUKI TECH CO LTD