Electrically tunable filter

Abstract

The embodiment of the invention provides an electrically tunable filter, relating to the technical field of electronic communication. The electrically tunable filter comprises a shell, a signal input end and a signal output end. A plurality of resonance units are arranged in the shell, wherein one end of each resonance unit is fixed on the inner wall at one side of the shell. Gaps are kept among adjacent resonance units. Two resonance units with the farthest distance from each other are respectively connected with the signal input end and the signal output end. Medium sheets which are used for adjusting the resonance frequencies of the corresponding resonance units by means of ascending and descending are arranged below the resonance units. The electrically tunable filter not only has a small number of tuning parameters, but also has a simple structure and can better realize the free movement of a center frequency point and the bandwidth of a passband.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an electronically adjustable filter. Background technique [0002] With the development of electronic industry technology, filters are used more and more widely, and filters can be seen in modern telecommunication equipment and various control systems. The performance of the filter also directly determines the quality of the corresponding electronic products. As modern electronic products have more and more functions, the performance of the corresponding filters is required to be higher and higher. With better performance, the signal frequency passband can be adjusted according to actual needs, so it is used in many devices or products. [0003] However, the inventors have found that the defects in the prior art are: the existing electronically tuned filters basically adopt the addition of electrically tuned lumped parameter elements in the filter to change the passband of t...

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Problems solved by technology

[0003] However, the inventors have found that the defects in the prior art are: the existing electronically tuned filters basically adopt the addition of electrically tuned lumped parameter elements in the filter to change the passband of the filter, such as at the open end of the filter resonant rod Adding electric tuning capacitors, this design makes the filter need to adjust more parameters in actual use, the frequency of the tuning signal is more complicated, and this filter can only withstand a small input power, which greatly limits its application scenarios

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