Active low pass filter

A low-pass filter and filter technology, applied in the direction of single-port active network, etc., can solve the problems of late development, high threshold of ultra-high frequency radio frequency technology, lack of technology, etc., and achieve the effect of simple and practical structure

Active Publication Date: 2016-08-31
北京腾华科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, for UHF RF filters, the threshold of UHF RF technology is high, the domestic development is relatively late, and the technology is relatively lacking. T...

Method used

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Examples

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Embodiment Construction

[0019] exist figure 1 Among them, an active low-pass filter, including a passive low-pass filter module 2, a low-noise amplifier module 3, an input matching module 1, a cascade matching module 3, an output matching module 5, and a passive low-pass filter module 2 are respectively connected to the output end of the input matching module 1 and the input end of the cascade matching module 3, and the low noise amplifier module 4 is respectively connected to the input end of the output matching module 5 and the output end of the cascade matching module 3.

[0020] In the specific examples above, such as image 3 As shown, the passive low-pass filter module consists of the fifth microstrip line TL5, the sixth microstrip line TL6, the seventh microstrip line TL7, the eighth microstrip line TL8, the ninth microstrip line TL9, the tenth microstrip line Line TL10, eleventh microstrip line TL11, twelfth microstrip line TL12, thirteenth microstrip line TL13, fourteenth microstrip line TL...

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Abstract

The invention discloses an active low pass filter, which comprises an input matching module, a passive low pass filter module, an inter-stage matching module, a low noise amplifier module and an output matching module, wherein the output end of the input matching module is connected with the input end of the passive low pass filter module; the output end of the passive low pass filter module is connected with the input end of the inter-stage matching module; the output end of the inter-stage matching module is connected with the input end of the low noise amplifier module; the inter-stage matching module enables circuit impedance between the passive low pass filter module and the low noise amplifier module to achieve 50 ohm, and the low noise amplifier module enables the gain of the overall system to be 3 dB larger than the required; and the output end of the low noise amplifier module is connected with the input end of the output matching module. The overall structure comprises the three matching circuit modules, one passive low pass filter module and one low noise amplifier module, the structure is simple and practical, and the active low pass filter can be used in design of other types of filters.

Description

technical field [0001] The invention relates to an active low-pass filter, in particular to an active microstrip ultra-wideband low-pass filter. Background technique [0002] A filter is an electronic device that allows useful frequency signals to pass while suppressing unwanted frequency signals, and is often used in signal processing. Its function is to allow signals from zero to a certain cutoff frequency to pass without attenuation, while suppressing signals at other frequencies. Since there are all kinds of needed or unnecessary information in the real world, it can transform the input signal into the output signal required by the system in a certain prescribed way, allowing some frequency component signals to pass and other signals to pass through. Signals with frequency components are blocked or attenuated. It is a widely used signal processing system, which plays an important role in communication, aerospace, automatic control, sensors and other fields. However, f...

Claims

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Application Information

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IPC IPC(8): H03H11/46
CPCH03H11/46
Inventor 赛景波刘铮
Owner 北京腾华科技有限公司
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