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Low pass filter

A low-pass filter and metal channel technology, applied in the field of filters, can solve the problems of low power capacity, limited stopband suppression depth, and inability to fine-tune, and achieve the effects of convenient debugging, high passband cutoff frequency, and simple structure

Inactive Publication Date: 2013-07-10
如皋市宏茂铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the suspended stripline low-pass filter still has disadvantages such as low power capacity, limited stop-band suppression depth, and inability to fine-tune

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] As it is figure 1 As shown, a low-pass filter includes two input and output structure inner conductors 1, two input and output structure outer conductors 2, a metal channel 3, a metal inner conductor 4, and 7 tuning screws 5. The metallic inner conductor 4 is connected to the inner conductor 1 of the input / output structure at both ends, respectively. The tuning screw 5 extends into the metal channel 3 and points to the metal inner conductor 4. There is a gap between the metal inner conductor 4 and the inner wall of the metal channel 3. The tuning screws 5 are arranged along the axis of the metal inner conductor 4.

[0033] Seven tuning screws 5 are arranged on the axis of the metal inner conductor 4. The adjacent tuning screws 5 are alternately arranged on both sides of the axis of the metal inner conductor 4, and the axes of the two adjacent tuning screws 5 are parallel to each other. which is figure 1 The first tuning screw 5 shown in the figure is located above the m...

Embodiment 2

[0041] Such as figure 1 with 2 As shown, the low-pass filter is similar to the first embodiment. The main difference is that the axes of the metal channel 3 and the metal inner conductor 4 are both straight lines. This is used when the number of filter tuning screws 5 is small.

[0042] We only give two implementation examples of low-pass filters here. The implementation of the present invention is not limited. For example, according to the requirements of stopband suppression, the number of tuning screws 5 constituting the filter can be set to 3-50 or even more. Several same or different low-pass filters of the present invention can also be connected in series to obtain different passband or stopband frequency responses.

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Abstract

The invention discloses a low pass filter which mainly comprises an input and output structure, a metal channel (3), a metal inner conductor (4) which is arranged in the metal channel (3), and a plurality of tuning bolts (5). The low pass filter has the advantages of simple structure, convenient tuning, high passband cut-off frequency and inhibition of steep transition band. The low pass filter can be widely used for electronic systems of various microwave bands and especially in the military and civil fields of radar, missile guidance, communication and the like.

Description

Technical field [0001] The present invention relates to a filter, in particular to a low-pass filter composed of a coaxial inner conductor and a tuning screw. Background technique [0002] A low-pass filter can be realized by periodically loading capacitors on a coaxial inner conductor. The most common low-pass filters include the inner conductor of the coaxial structure loaded by the disk and the inner conductor of the microstrip with sudden impedance changes. The former has disadvantages such as complex structure, high machining accuracy requirements, difficult support, insufficient transition frequency band suppression, and difficult debugging. The latter has shortcomings such as high channel high-end loss, low power capacity, limited stopband suppression depth, insufficient transition band suppression, and inability to fine-tune. Compared with ordinary microstrip low-pass filters, the suspended stripline low-pass filters that have recently appeared on the market have improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/20H01P1/202
Inventor 王清源刘英明罗志刚
Owner 如皋市宏茂铸钢有限公司