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Filtering circuit and construction thereof

A filter circuit and resonant circuit technology, applied in circuits, electrical components, waveguide devices, etc., can solve the problem that noise cannot be effectively suppressed, and achieve the effect of simple structure and good yield.

Active Publication Date: 2009-03-18
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the bandpass filter effectively filters the signal, the noise adjacent to the operating frequency band cannot be effectively suppressed on the frequency response of the bandpass filter

Method used

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  • Filtering circuit and construction thereof
  • Filtering circuit and construction thereof
  • Filtering circuit and construction thereof

Examples

Experimental program
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Embodiment Construction

[0045] Figure 5A A block diagram of a filter circuit according to an embodiment of the present invention is shown. Please refer to Figure 5A , the filter circuit 500 includes an input terminal 510 , an output terminal 520 , a resonant circuit 530 , a first coupling part 560 and a second coupling part 570 . The resonant circuit 530 includes M resonators 531_1 - 531_M, where M is a natural number greater than or equal to 3. Its coupling relationship is as Figure 5A shown. In this embodiment, the first coupling part 560 and the second coupling part 570 are respectively coupled to two non-adjacent resonators 531_i and 531_j, that is, |i−j|≥2. The resonant circuit 530 mainly filters out the energy of the signal received by the input terminal 510 outside an operating frequency band, which is generally referred to as a band-pass filter. In this embodiment, the first coupling part 560 and the second coupling part 570 are implemented, for example, by two parallel transmission l...

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PUM

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Abstract

The invention relates to a filter circuit and a structure thereof, wherein the filter circuit comprises an input end, an output end, a resonance circuit, a first coupling portion and a second coupling portion, wherein the resonance circuit is coupled between the input end and the output end, which comprises M resonators which are arrayed in sequence, and signals which are received by the input end can be transmitted to the output end by the resonance circuit through the mutual coupling of the adjacent resonators. The first coupling portion and the second coupling portion are respectively coupled on the non-adjacent resonators. Partial signals which are received by the input end are coupled to the second coupling portion through the first coupling portion in a crossed coupling mode. And therefore, the inhabitation to undesired signals near an operation frequency band is increased.

Description

technical field [0001] The invention relates to a high-frequency filtering technology, and in particular to a filtering circuit, a filtering circuit structure and a filtering method thereof. Background technique [0002] In a communication system, except for signals in an operation band, signals in other frequency bands are noises, and the generation of the above noises is sufficient to affect communication quality. Therefore, filters are usually configured in communication systems and are responsible for passing signals in the operating frequency band and blocking signals in other frequency bands. The general requirements for the filter include: after the signal is filtered by the filter, there is a sufficiently low loss of signal energy in the operating frequency band, that is to say, for the signal in the operating frequency band, after filtering by the filter, it must be similar to the filter previous signal. For the signal outside the operating frequency band, after b...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 庄嘉成
Owner IND TECH RES INST
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