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Ultra-wideband (UWB) filter with band-notched characteristics

A technology with ultra-wideband filter and notch characteristics, which is applied in the field of filters in the field of communication technology, can solve the problems of inability to meet a large number of high-performance filters, and the function of ultra-wideband filters is not ideal enough to improve out-of-band performance. , Good in-band and out-of-band characteristics, the effect of relatively large passband bandwidth

Inactive Publication Date: 2012-02-22
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the function of the current ultra-wideband filter is not ideal enough to meet the large demand for high-quality and high-performance filters in various fields.

Method used

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  • Ultra-wideband (UWB) filter with band-notched characteristics
  • Ultra-wideband (UWB) filter with band-notched characteristics
  • Ultra-wideband (UWB) filter with band-notched characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] see image 3 and Figure 4, an ultra-wideband filter with notch characteristics, including a metal microstrip line on the front part, a metal plating layer 8 on the back part, and a dielectric board 9 in the middle layer. The dielectric board 9 in the middle layer has two SMA connectors, and the input The output interface 1 and the input and output interface 5 are respectively electrically connected to the SMA connector, and it is characterized in that: the metal microstrip line is connected at intervals by a quarter-wavelength comb coupling microstrip line 2 and a half-wavelength microstrip line 4 to form a straight line Cascaded microstrip line structure, the half-wavelength microstrip line 4 has a microstrip slot 3, two ends of the linear cascaded microstrip line structure are respectively provided with two comb-shaped coupling microstrip lines 2, and the linear cascaded microstrip line structure The two ends of the feed-in and feed-out electromagnetic signals of th...

Embodiment 2

[0043] This embodiment is basically the same as Embodiment 1, especially in that:

[0044] see Figure 5 The dielectric board 9 of the middle layer in this embodiment has two metallized through holes 6, and the metallized through holes 6 electrically connect the free end of the short-circuit stub 7 with the metal plating layer 8 on the reverse side. The dielectric board 9 of the middle layer in this embodiment adopts the short circuit method of the metallized through hole 6 .

[0045] In order to make the filter easier to process and manufacture, the free end of the short-circuit branch 7 is preferably electrically connected to a metal connection part, and the metal connection part is directly electrically connected to the metal plating layer 8 on the back part through the metallized through hole 6, so that the short-circuit branch 7 and The metal plating layer 8 implements indirect electrical connection, and the metal connection part has a through hole with the same size and...

Embodiment 3

[0050] This embodiment is basically the same as Embodiment 1 and Embodiment 2, and the special features are:

[0051] Figure 5 It is a structural schematic diagram of the present embodiment. After design, simulation and optimization, the main material parameters and specific dimensions of the novel ultra-wideband filter with good notch characteristics are finally determined as follows:

[0052] The dielectric plate 9 of the middle layer is a dielectric constant =9.8 dielectric board, the thickness of the dielectric board is h=1.27mm, and the metallized through hole 6 is covered with conductive metal on the inner wall after drilling; the length of the four-wire interleaved coupling microstrip line of the comb-shaped coupling microstrip line 2 is L3. =4.4mm, its width is W1=0.1mm, the gap width G=0.1mm of the adjacent coupled microstrip line; the total length L4 of the half-wavelength microstrip line 4=8.4mm, and its total width W5=1.7mm , its internal void length L5=5.9mm, ...

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Abstract

The invention discloses an ultra-wideband (UWB) filter with band-notched characteristics. The UWB filter comprises a metal microstrip line at a front face part, a metal coating at a rear face part and a dielectric slab at a middle layer, wherein, the metal microstrip line is of a linear cascaded microstrip line structure which is formed by alternately connecting comb coupled microstrip lines with a quarter of wavelength and a microstrip line with half wavelength; the microstrip line with half wavelength is provided with microstrip slits; uniform transmission parts on the outer ends of the two comb coupled microstrip lines are respectively and electrically connected with input and output interfaces and two short-circuit stubs with a quarter of wavelength; and free ends of the short-circuit stubs with a quarter of wavelength are electrically connected with the metal coating at the rear face part. The UWB filter disclosed by the invention has the advantages of good band-notched characteristics, high coupling coefficient, small volume, easy machining process, steep sideband characteristics and good frequency selectivity, and a passband is internally provided with a steep trap with the relative width of more than 125%, thus meeting the requirement for miniaturization.

Description

technical field [0001] The invention relates to a filter in the field of communication technology, in particular to a compact planar filter with ultra-wideband function and network interference signal suppression function. Background technique [0002] With the rapid development of communication technology, people have higher and higher requirements for information transmission system. In this context, UWB ultra-wideband technology has become a research hotspot in the field of communication due to its advantages of simple system, low cost, low power consumption, fast data transmission speed, and high security. From the 1960s to the 1990s, UWB technology mainly used its original pulse communication form, and was mainly used in military radar and communication systems with low interception rates. In recent years, with the improvement of the technology and process of microelectronic devices, UWB technology has begun to be used in the civilian field, and has set off an upsurge ...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 张鲁红马哲旺杨在峰熊晗翟清波
Owner SHANGHAI UNIV
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