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Non-reflection filter with equal ripple response

A filter and equi-ripple technology, applied in the filter field, can solve problems such as poor filtering performance, uncontrollable response, and flat passband, etc., and achieve good filtering effect, high-order expansion, and uniform suppression

Pending Publication Date: 2022-04-22
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing non-reflection filter cannot control the response generated by it, let alone guarantee the equi-ripple response at the transmission end, resulting in the existing non-reflection filter being not flat enough in the passband, not uniform enough outside the passband, and poor in filtering performance

Method used

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  • Non-reflection filter with equal ripple response
  • Non-reflection filter with equal ripple response
  • Non-reflection filter with equal ripple response

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] A third-order non-reflection filter with equal ripple response, the schematic diagram is as follows figure 1 As shown, it includes a first port 101, a second port 102, a third port 103, a fourth port 104, four first inductors 105, two second inductors 106, four first capacitors 107, and two second capacitors 108 , two third capacitors 109 , two third inductors 1010 , and an inverter 1011 .

[0029] Two first inductances 105 are connected in series between the first port 101 and the second port 102, a first branch is set between the two first inductances 105, and the first branch includes the second inductance 106 and the third inductance connected in series. A capacitor 109, one end of the second inductor 106 is connected to the first inductor 105, the other end of the second inductor 106 is connected to the third capacitor 109, and the other end of the third capacitor 109 is grounded, forming a first low-pass branch. The second low-pass branch has the same structure a...

Embodiment 2

[0036] A fifth-order non-reflection filter with equal ripple response, the schematic diagram is as follows image 3 As shown, the circuit structure in this embodiment includes a first port 101, a second port 102, a third port 103, a fourth port 104, four first inductors 105, four second inductors 106, and four third inductors 1010 , two fourth inductors 1012 , four first capacitors 107 , four second capacitors 108 , four third capacitors 109 , two fourth capacitors 1013 , and an inverter 1011 .

[0037] Three inductances are connected in series between the first port 101 and the second port 102, and a first branch is provided between the two first inductances 105 and the fourth inductance 1012, and the first branch includes the second inductance 106 connected in series and the third capacitor 109 , one end of the second inductor 106 is connected to the first inductor 105 , the other end of the second inductor 106 is connected to the third capacitor 109 , and the other end of t...

Embodiment 3

[0043] A non-reflection filter with equal ripple response with fifth-order capacitance added, the schematic diagram is as follows Figure 5 As shown, in this embodiment, on the basis of the circuit of Embodiment 2, a fifth capacitor 1014 is additionally arranged on the low-pass branch, and a fifth inductor 1015 is additionally arranged on the high-pass branch. In each low-pass branch Both ends of the fifth capacitor 1014 are respectively connected to the ends of the second inductors 106 in the two first branches, and the two ends of the fifth inductor 1015 in each high-pass branch are respectively connected to the ends of the second capacitors 108 in the two second branches. end connection.

[0044] The component values ​​of the components in this embodiment are: the inductance values ​​of the four first inductors 105 are all 365.2606pF, the capacitance values ​​of the four first capacitors 107 are all 69.3486pF, and the inductance values ​​of the two fourth inductors 1012 are...

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Abstract

The invention discloses a non-reflection filter with equal ripple response, which comprises a first port, a second port, a third port and a fourth port, the first low-pass branch is arranged between the first port and the second port; the first high-pass branch is arranged between the first port and the third port; the second low-pass branch is arranged between the third port and the fourth port; the second high-pass branch is arranged between the second port and the fourth port; the first low-pass branch and the second low-pass branch have the same structure, and the first high-pass branch and the second high-pass branch have the same structure; the first low-pass branch, the first high-pass branch, the second low-pass branch and the second high-pass branch are sequentially connected end to end to form a loop main line of a closed-loop structure. According to the invention, the low-pass branch and the high-pass branch which are completely complementary in filtering characteristics are established, and the transmission responses of any one port to the two adjacent ports are respectively complementary, so that the influence caused by stop-band reflection signals can be effectively reduced.

Description

technical field [0001] The invention relates to the field of filters, in particular to a reflectionless filter with equiripple response. Background technique [0002] A filter is an electronic device that is widely used in various electronic systems. Its function is to let the frequency components required in the signal pass, and other frequency components are attenuated. Most of the existing common filters use reflection filtering. When the reflection filter does not match the impedance of the signal source, part of the energy will be reflected back to the signal source, and the interference level will also increase. In order to avoid the adverse effects of reflected signals, researchers began to study reflection filters. After the interference signal passes through the non-reflective filter, its electromagnetic energy is converted into heat energy and consumed, achieving the effect of non-reflective filtering. The filtering response of the filter can have a significant im...

Claims

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Application Information

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IPC IPC(8): H03H11/04
CPCH03H11/04
Inventor 黄晓东牟依敏金秀华
Owner NANJING UNIV OF POSTS & TELECOMM
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