Passive filter

Abstract

The invention discloses a passive filter. The passive filter comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a third capacitor C3, an operation amplifier A, an AC power source Vi and a DC power source Vo; one end of the first capacitor C1 is connected with a public end of the second resistor R2 and the third resistor R3, one end of the second capacitor C2 is connected with the public end of the third resistor R3 and the operation amplifier A; the other end of the third capacitor C3 is connected with the public end of the first resistor R1 and the second resistor R2; the output end of the operation amplifier A is connected with the DC power source Vo. The passive filter disclosed by the invention is capable of performing duplicated filtering on a signal in the microwave communication so as to well filter unnecessary communication signals in the microwave communication, the finally received transmission signal is more accurate, and the resonance phenomenon is avoided.

Description

technical field [0001] The invention relates to the field of filters, in particular to a passive filter. Background technique [0002] Filters are electrical components that reduce or eliminate the impact of harmonics on power systems. A filter is a device used to eliminate interference signals, filtering the input or output to obtain pure direct current. A circuit that effectively filters out a frequency point of a specific frequency or frequencies other than this frequency point is a filter, and its function is to obtain a specific frequency or eliminate a specific frequency. In the field of microwave communication, it is often necessary to filter the transmitted electromagnetic waves to retain electromagnetic waves with a wavelength between 0.1 mm and 1 meter. Filter circuits are also required in this process. The characteristics of existing filter circuits are greatly affected by system parameters, and can only eliminate specific harmonics, but will amplify some harmon...

AI Technical Summary

Problems solved by technology

The characteristics of the existing filter circuit are greatly affected by system parameters, and can only eliminate specific harmonics, but will amplify some harmonics, and even cause resonance, which is not conducive to microwave communication

In addition, there are also filter circuits that do not generate resonance, but the bandwidth of the integrated operational amplifier is limited, making it difficult to make the operating frequency of the filter circuit very high

However, microwave communication has been widely used because of its frequency bandwidth, large capacity, and can be used for the transmission of various telecommunication services. The existing filter circuits have great defects, which are not conducive to the development of microwave communication.

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